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1298 lines
88 KiB
1298 lines
88 KiB
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html lang="en-US-x-Hixie" ><head><title>4.10 Forms — HTML5 </title><style type="text/css">
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pre { margin-left: 2em; white-space: pre-wrap; }
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h2 { margin: 3em 0 1em 0; }
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h3 { margin: 2.5em 0 1em 0; }
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h4 { margin: 2.5em 0 0.75em 0; }
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h5, h6 { margin: 2.5em 0 1em; }
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h1 + h2, h1 + h2 + h2 { margin: 0.75em 0 0.75em; }
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h2 + h3, h3 + h4, h4 + h5, h5 + h6 { margin-top: 0.5em; }
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p { margin: 1em 0; }
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hr:not(.top) { display: block; background: none; border: none; padding: 0; margin: 2em 0; height: auto; }
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dl, dd { margin-top: 0; margin-bottom: 0; }
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dt { margin-top: 0.75em; margin-bottom: 0.25em; clear: left; }
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dt + dt { margin-top: 0; }
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dd dt { margin-top: 0.25em; margin-bottom: 0; }
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dd p { margin-top: 0; }
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dd dl + p { margin-top: 1em; }
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dd table + p { margin-top: 1em; }
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p + * > li, dd li { margin: 1em 0; }
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dt, dfn { font-weight: bold; font-style: normal; }
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dt dfn { font-style: italic; }
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pre, code { font-size: inherit; font-family: monospace; font-variant: normal; }
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pre strong { color: black; font: inherit; font-weight: bold; background: yellow; }
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pre em { font-weight: bolder; font-style: normal; }
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@media screen { code { color: orangered; } code :link, code :visited { color: inherit; } }
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var sub { vertical-align: bottom; font-size: smaller; position: relative; top: 0.1em; }
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table { border-collapse: collapse; border-style: hidden hidden none hidden; }
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table thead, table tbody { border-bottom: solid; }
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table tbody th:first-child { border-left: solid; }
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table tbody th { text-align: left; }
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table td, table th { border-left: solid; border-right: solid; border-bottom: solid thin; vertical-align: top; padding: 0.2em; }
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blockquote { margin: 0 0 0 2em; border: 0; padding: 0; font-style: italic; }
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.bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
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.matrix, .matrix td { border: none; text-align: right; }
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.matrix { margin-left: 2em; }
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.dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
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.dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
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.dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
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.toc dfn, h1 dfn, h2 dfn, h3 dfn, h4 dfn, h5 dfn, h6 dfn { font: inherit; }
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img.extra { float: right; }
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pre.idl { border: solid thin; background: #EEEEEE; color: black; padding: 0.5em 1em; }
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pre.idl :link, pre.idl :visited { color: inherit; background: transparent; }
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pre.css { border: solid thin; background: #FFFFEE; color: black; padding: 0.5em 1em; }
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pre.css:first-line { color: #AAAA50; }
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dl.domintro { color: green; margin: 2em 0 2em 2em; padding: 0.5em 1em; border: none; background: #DDFFDD; }
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hr + dl.domintro, div.impl + dl.domintro { margin-top: 2.5em; margin-bottom: 1.5em; }
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dl.domintro dt, dl.domintro dt * { color: black; text-decoration: none; }
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dl.domintro dd { margin: 0.5em 0 1em 2em; padding: 0; }
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dl.domintro dd p { margin: 0.5em 0; }
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dl.switch { padding-left: 2em; }
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dl.switch > dt { text-indent: -1.5em; }
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dl.switch > dt:before { content: '\21AA'; padding: 0 0.5em 0 0; display: inline-block; width: 1em; text-align: right; line-height: 0.5em; }
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dl.triple { padding: 0 0 0 1em; }
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dl.triple dt, dl.triple dd { margin: 0; display: inline }
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dl.triple dt:after { content: ':'; }
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dl.triple dd:after { content: '\A'; white-space: pre; }
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.diff-old { text-decoration: line-through; color: silver; background: transparent; }
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.diff-chg, .diff-new { text-decoration: underline; color: green; background: transparent; }
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a .diff-new { border-bottom: 1px blue solid; }
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h2 { page-break-before: always; }
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h1, h2, h3, h4, h5, h6 { page-break-after: avoid; }
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h1 + h2, hr + h2.no-toc { page-break-before: auto; }
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p > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]),
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li > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]), { border-bottom: solid #9999CC; }
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div.head { margin: 0 0 1em; padding: 1em 0 0 0; }
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div.head p { margin: 0; }
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div.head h1 { margin: 0; }
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div.head .logo { float: right; margin: 0 1em; }
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div.head .logo img { border: none } /* remove border from top image */
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div.head dl { margin: 1em 0; }
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div.head p.copyright, div.head p.alt { font-size: x-small; font-style: oblique; margin: 0; }
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body > .toc > li { margin-top: 1em; margin-bottom: 1em; }
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body > .toc.brief > li { margin-top: 0.35em; margin-bottom: 0.35em; }
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body > .toc > li > * { margin-bottom: 0.5em; }
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body > .toc > li > * > li > * { margin-bottom: 0.25em; }
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.toc, .toc li { list-style: none; }
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.brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
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.brief li { margin: 0; padding: 0; }
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.brief li p { margin: 0; padding: 0; }
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.category-list { margin-top: -0.75em; margin-bottom: 1em; line-height: 1.5; }
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.category-list::before { content: '\21D2\A0'; font-size: 1.2em; font-weight: 900; }
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.category-list li { display: inline; }
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.category-list li:not(:last-child)::after { content: ', '; }
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.category-list li > span, .category-list li > a { text-transform: lowercase; }
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.category-list li * { text-transform: none; } /* don't affect <code> nested in <a> */
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.XXX { color: #E50000; background: white; border: solid red; padding: 0.5em; margin: 1em 0; }
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.XXX > :first-child { margin-top: 0; }
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p .XXX { line-height: 3em; }
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.annotation { border: solid thin black; background: #0C479D; color: white; position: relative; margin: 8px 0 20px 0; }
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.annotation:before { position: absolute; left: 0; top: 0; width: 100%; height: 100%; margin: 6px -6px -6px 6px; background: #333333; z-index: -1; content: ''; }
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.annotation :link, .annotation :visited { color: inherit; }
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.annotation :link:hover, .annotation :visited:hover { background: transparent; }
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.annotation span { border: none ! important; }
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.note { color: green; background: transparent; font-family: sans-serif; }
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.warning { color: red; background: transparent; }
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.note, .warning { font-weight: bolder; font-style: italic; }
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p.note, div.note { padding: 0.5em 2em; }
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span.note { padding: 0 2em; }
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.note p:first-child, .warning p:first-child { margin-top: 0; }
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.note p:last-child, .warning p:last-child { margin-bottom: 0; }
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.warning:before { font-style: normal; }
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p.note:before { content: 'Note: '; }
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p.warning:before { content: '\26A0 Warning! '; }
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.bookkeeping:before { display: block; content: 'Bookkeeping details'; font-weight: bolder; font-style: italic; }
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.bookkeeping { font-size: 0.8em; margin: 2em 0; }
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.bookkeeping p { margin: 0.5em 2em; display: list-item; list-style: square; }
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.bookkeeping dt { margin: 0.5em 2em 0; }
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.bookkeeping dd { margin: 0 3em 0.5em; }
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h4 { position: relative; z-index: 3; }
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h4 + .element, h4 + div + .element { margin-top: -2.5em; padding-top: 2em; }
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.element {
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background: #EEEEFF;
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color: black;
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margin: 0 0 1em 0.15em;
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padding: 0 1em 0.25em 0.75em;
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border-left: solid #9999FF 0.25em;
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position: relative;
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z-index: 1;
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}
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.element:before {
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position: absolute;
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z-index: 2;
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top: 0;
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left: -1.15em;
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height: 2em;
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width: 0.9em;
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background: #EEEEFF;
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content: ' ';
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border-style: none none solid solid;
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border-color: #9999FF;
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border-width: 0.25em;
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}
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.example { display: block; color: #222222; background: #FCFCFC; border-left: double; margin-left: 2em; padding-left: 1em; }
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td > .example:only-child { margin: 0 0 0 0.1em; }
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ul.domTree, ul.domTree ul { padding: 0 0 0 1em; margin: 0; }
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ul.domTree li { padding: 0; margin: 0; list-style: none; position: relative; }
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ul.domTree li li { list-style: none; }
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ul.domTree li:first-child::before { position: absolute; top: 0; height: 0.6em; left: -0.75em; width: 0.5em; border-style: none none solid solid; content: ''; border-width: 0.1em; }
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ul.domTree li:not(:last-child)::after { position: absolute; top: 0; bottom: -0.6em; left: -0.75em; width: 0.5em; border-style: none none solid solid; content: ''; border-width: 0.1em; }
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ul.domTree span { font-style: italic; font-family: serif; }
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ul.domTree .t1 code { color: purple; font-weight: bold; }
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ul.domTree .t2 { font-style: normal; font-family: monospace; }
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ul.domTree .t2 .name { color: black; font-weight: bold; }
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ul.domTree .t2 .value { color: blue; font-weight: normal; }
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ul.domTree .t3 code, .domTree .t4 code, .domTree .t5 code { color: gray; }
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ul.domTree .t7 code, .domTree .t8 code { color: green; }
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ul.domTree .t10 code { color: teal; }
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body.dfnEnabled dfn { cursor: pointer; }
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.dfnPanel {
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display: inline;
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position: absolute;
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z-index: 10;
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height: auto;
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width: auto;
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padding: 0.5em 0.75em;
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font: small sans-serif, Droid Sans Fallback;
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background: #DDDDDD;
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color: black;
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border: outset 0.2em;
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}
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.dfnPanel * { margin: 0; padding: 0; font: inherit; text-indent: 0; }
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.dfnPanel :link, .dfnPanel :visited { color: black; }
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.dfnPanel p { font-weight: bolder; }
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.dfnPanel * + p { margin-top: 0.25em; }
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.dfnPanel li { list-style-position: inside; }
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#configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
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#configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
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#configUI p label { display: block; }
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#configUI #updateUI, #configUI .loginUI { text-align: center; }
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#configUI input[type=button] { display: block; margin: auto; }
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fieldset { margin: 1em; padding: 0.5em 1em; }
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fieldset > legend + * { margin-top: 0; }
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fieldset > :last-child { margin-bottom: 0; }
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fieldset p { margin: 0.5em 0; }
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.stability {
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position: fixed;
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bottom: 0;
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left: 0; right: 0;
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margin: 0 auto 0 auto !important;
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z-index: 1000;
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width: 50%;
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background: maroon; color: yellow;
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-webkit-border-radius: 1em 1em 0 0;
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-moz-border-radius: 1em 1em 0 0;
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border-radius: 1em 1em 0 0;
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-moz-box-shadow: 0 0 1em #500;
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-webkit-box-shadow: 0 0 1em #500;
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box-shadow: 0 0 1em red;
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padding: 0.5em 1em;
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text-align: center;
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}
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.stability strong {
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display: block;
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}
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.stability input {
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appearance: none; margin: 0; border: 0; padding: 0.25em 0.5em; background: transparent; color: black;
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position: absolute; top: -0.5em; right: 0; font: 1.25em sans-serif; text-align: center;
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}
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.stability input:hover {
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color: white;
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text-shadow: 0 0 2px black;
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}
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.stability input:active {
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padding: 0.3em 0.45em 0.2em 0.55em;
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}
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.stability :link, .stability :visited,
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.stability :link:hover, .stability :visited:hover {
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background: transparent;
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color: white;
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}
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</style><link href="data:text/css,.impl%20%7B%20display:%20none;%20%7D%0Ahtml%20%7B%20border:%20solid%20yellow;%20%7D%20.domintro:before%20%7B%20display:%20none;%20%7D" id="author" rel="alternate stylesheet" title="Author documentation only"><link href="data:text/css,.impl%20%7B%20background:%20%23FFEEEE;%20%7D%20.domintro:before%20%7B%20background:%20%23FFEEEE;%20%7D" id="highlight" rel="alternate stylesheet" title="Highlight implementation
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requirements"><link href="http://www.w3.org/StyleSheets/TR/W3C-WD" rel="stylesheet" type="text/css"><style type="text/css">
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.applies thead th > * { display: block; }
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.applies thead code { display: block; }
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.applies tbody th { whitespace: nowrap; }
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.applies td { text-align: center; }
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.applies .yes { background: yellow; }
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.matrix, .matrix td { border: hidden; text-align: right; }
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.matrix { margin-left: 2em; }
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.dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
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.dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
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.dice-example td, .dice-example th { border: solid thin; width: 1.35em; height: 1.05em; text-align: center; padding: 0; }
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td.eg { border-width: thin; text-align: center; }
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#table-example-1 { border: solid thin; border-collapse: collapse; margin-left: 3em; }
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#table-example-1 * { font-family: "Essays1743", serif; line-height: 1.01em; }
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#table-example-1 caption { padding-bottom: 0.5em; }
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#table-example-1 thead, #table-example-1 tbody { border: none; }
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#table-example-1 th, #table-example-1 td { border: solid thin; }
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#table-example-1 th { font-weight: normal; }
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#table-example-1 td { border-style: none solid; vertical-align: top; }
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#table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
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#table-example-1 tbody tr:first-child td { padding-top: 0.5em; }
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#table-example-1 tbody tr:last-child td { padding-bottom: 1.5em; }
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#table-example-1 tbody td:first-child { padding-left: 2.5em; padding-right: 0; width: 9em; }
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#table-example-1 tbody td:first-child::after { content: leader(". "); }
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#table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
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#table-example-1 tbody td:first-child + td { width: 10em; }
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#table-example-1 tbody td:first-child + td ~ td { width: 2.5em; }
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#table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
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.apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
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.apple-table-examples * { font-family: "Times", serif; }
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.apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
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.apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
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.apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
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.apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
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.apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
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.apple-table-examples td { text-align: right; vertical-align: top; }
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.apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
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.apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
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.apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
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.apple-table-examples sup { line-height: 0; }
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.details-example img { vertical-align: top; }
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#base64-table {
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white-space: nowrap;
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font-size: 0.6em;
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column-width: 6em;
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column-count: 5;
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column-gap: 1em;
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-moz-column-width: 6em;
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-moz-column-count: 5;
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-moz-column-gap: 1em;
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-webkit-column-width: 6em;
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-webkit-column-count: 5;
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-webkit-column-gap: 1em;
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}
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#base64-table thead { display: none; }
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#base64-table * { border: none; }
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#base64-table tbody td:first-child:after { content: ':'; }
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#base64-table tbody td:last-child { text-align: right; }
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#named-character-references-table {
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white-space: nowrap;
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font-size: 0.6em;
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column-width: 30em;
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column-gap: 1em;
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-moz-column-width: 30em;
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-moz-column-gap: 1em;
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-webkit-column-width: 30em;
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-webkit-column-gap: 1em;
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}
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#named-character-references-table > table > tbody > tr > td:first-child + td,
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#named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
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#named-character-references-table > table > tbody > tr > td:last-child:hover > span { position: absolute; top: auto; left: auto; margin-left: 0.5em; line-height: 1.2; font-size: 5em; border: outset; padding: 0.25em 0.5em; background: white; width: 1.25em; height: auto; text-align: center; }
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#named-character-references-table > table > tbody > tr#entity-CounterClockwiseContourIntegral > td:first-child { font-size: 0.5em; }
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.glyph.control { color: red; }
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@font-face {
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font-family: 'Essays1743';
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src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743.ttf');
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}
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@font-face {
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font-family: 'Essays1743';
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font-weight: bold;
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src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Bold.ttf');
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}
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@font-face {
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font-family: 'Essays1743';
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font-style: italic;
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src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-Italic.ttf');
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}
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@font-face {
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font-family: 'Essays1743';
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font-style: italic;
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font-weight: bold;
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src: url('http://www.whatwg.org/specs/web-apps/current-work/fonts/Essays1743-BoldItalic.ttf');
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}
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</style><style type="text/css">
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.domintro:before { display: table; margin: -1em -0.5em -0.5em auto; width: auto; content: 'This box is non-normative. Implementation requirements are given below this box.'; color: black; font-style: italic; border: solid 2px; background: white; padding: 0 0.25em; }
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</style><script type="text/javascript">
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function getCookie(name) {
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var params = location.search.substr(1).split("&");
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if (data[0] == name)
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</script>
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<script src="link-fixup.js" type="text/javascript"></script>
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<link href="style.css" rel="stylesheet"><link href="tabular-data.html" title="4.9 Tabular data" rel="prev">
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<link href="spec.html#contents" title="Table of contents" rel="index">
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<link href="the-input-element.html" title="4.10.7 The input element" rel="next">
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</head><body><div class="head" id="head">
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<div id="multipage-common">
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<p class="stability" id="wip"><strong>This is a work in
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progress!</strong> For the latest updates from the HTML WG, possibly
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including important bug fixes, please look at the <a href="http://dev.w3.org/html5/spec/Overview.html">editor's draft</a> instead.
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There may also be a more
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<a href="http://www.w3.org/TR/html5">up-to-date Working Draft</a>
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with changes based on resolution of Last Call issues.
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<input onclick="closeWarning(this.parentNode)" type="button" value="╳⃝"></p>
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<script type="text/javascript">
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function closeWarning(element) {
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element.parentNode.removeChild(element);
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document.cookie = 'hide-obsolescence-warning=1; expires=' + date.toGMTString();
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}
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if (getCookie('hide-obsolescence-warning') == '1')
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setTimeout(function () { document.getElementById('wip').parentNode.removeChild(document.getElementById('wip')); }, 2000);
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</script></div>
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<p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
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<h1>HTML5</h1>
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</div><div>
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<a href="tabular-data.html" class="prev">4.9 Tabular data</a> –
|
|
<a href="spec.html#contents">Table of contents</a> –
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<a href="the-input-element.html" class="next">4.10.7 The input element</a>
|
|
<ol class="toc"><li><ol><li><a href="forms.html#forms"><span class="secno">4.10 </span>Forms</a>
|
|
<ol><li><a href="forms.html#introduction-1"><span class="secno">4.10.1 </span>Introduction</a>
|
|
<ol><li><a href="forms.html#writing-a-form-s-user-interface"><span class="secno">4.10.1.1 </span>Writing a form's user interface</a></li><li><a href="forms.html#implementing-the-server-side-processing-for-a-form"><span class="secno">4.10.1.2 </span>Implementing the server-side processing for a form</a></li><li><a href="forms.html#configuring-a-form-to-communicate-with-a-server"><span class="secno">4.10.1.3 </span>Configuring a form to communicate with a server</a></li><li><a href="forms.html#client-side-form-validation"><span class="secno">4.10.1.4 </span>Client-side form validation</a></li></ol></li><li><a href="forms.html#categories"><span class="secno">4.10.2 </span>Categories</a></li><li><a href="forms.html#the-form-element"><span class="secno">4.10.3 </span>The <code>form</code> element</a></li><li><a href="forms.html#the-fieldset-element"><span class="secno">4.10.4 </span>The <code>fieldset</code> element</a></li><li><a href="forms.html#the-legend-element"><span class="secno">4.10.5 </span>The <code>legend</code> element</a></li><li><a href="forms.html#the-label-element"><span class="secno">4.10.6 </span>The <code>label</code> element</a></li></ol></li></ol></li></ol></div>
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<h3 id="forms"><span class="secno">4.10 </span>Forms</h3><h4 id="introduction-1"><span class="secno">4.10.1 </span>Introduction</h4><p><i>This section is non-normative.</i></p><p>A form is a component of a Web page that has form controls, such
|
|
as text fields, buttons, checkboxes, range controls, or color
|
|
pickers. A user can interact with such a form, providing data that
|
|
can then be sent to the server for further processing (e.g.
|
|
returning the results of a search or calculation). No client-side
|
|
scripting is needed in many cases, though an API is available so
|
|
that scripts can augment the user experience or use forms for
|
|
purposes other than submitting data to a server.</p><p>Writing a form consists of several steps, which can be performed
|
|
in any order: writing the user interface, implementing the
|
|
server-side processing, and configuring the user interface to
|
|
communicate with the server.</p><h5 id="writing-a-form-s-user-interface"><span class="secno">4.10.1.1 </span>Writing a form's user interface</h5><p><i>This section is non-normative.</i></p><p>For the purposes of this brief introduction, we will create a
|
|
pizza ordering form.</p><p>Any form starts with a <code><a href="#the-form-element">form</a></code> element, inside which
|
|
are placed the controls. Most controls are represented by the
|
|
<code><a href="the-input-element.html#the-input-element">input</a></code> element, which by default provides a one-line
|
|
text field. To label a control, the <code><a href="#the-label-element">label</a></code> element is
|
|
used; the label text and the control itself go inside the
|
|
<code><a href="#the-label-element">label</a></code> element. Each part of a form is considered a
|
|
<a href="content-models.html#paragraph">paragraph</a>, and is typically separated from other parts
|
|
using <code><a href="grouping-content.html#the-p-element">p</a></code> elements. Putting this together, here is how
|
|
one might ask for the customer's name:</p><pre><strong><form>
|
|
<p><label>Customer name: <input></label></p>
|
|
</form></strong></pre><p>To let the user select the size of the pizza, we can use a set of
|
|
radio buttons. Radio buttons also use the <code><a href="the-input-element.html#the-input-element">input</a></code>
|
|
element, this time with a <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code>
|
|
attribute with the value <code title="attr-input-type-radio"><a href="number-state.html#radio-button-state">radio</a></code>. To make the radio
|
|
buttons work as a group, they are given a common name using the
|
|
<code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code> attribute. To group a batch
|
|
of controls together, such as, in this case, the radio buttons, one
|
|
can use the <code><a href="#the-fieldset-element">fieldset</a></code> element. The title of such a group
|
|
of controls is given by the first element in the
|
|
<code><a href="#the-fieldset-element">fieldset</a></code>, which has to be a <code><a href="#the-legend-element">legend</a></code>
|
|
element.</p><pre><form>
|
|
<p><label>Customer name: <input></label></p>
|
|
<strong> <fieldset>
|
|
<legend> Pizza Size </legend>
|
|
<p><label> <input type=radio name=size> Small </label></p>
|
|
<p><label> <input type=radio name=size> Medium </label></p>
|
|
<p><label> <input type=radio name=size> Large </label></p>
|
|
</fieldset></strong>
|
|
</form></pre><p class="note">Changes from the previous step are highlighted.</p><p>To pick toppings, we can use checkboxes. These use the
|
|
<code><a href="the-input-element.html#the-input-element">input</a></code> element with a <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute with the value <code title="attr-input-type-checkbox"><a href="number-state.html#checkbox-state">checkbox</a></code>:</p><pre><form>
|
|
<p><label>Customer name: <input></label></p>
|
|
<fieldset>
|
|
<legend> Pizza Size </legend>
|
|
<p><label> <input type=radio name=size> Small </label></p>
|
|
<p><label> <input type=radio name=size> Medium </label></p>
|
|
<p><label> <input type=radio name=size> Large </label></p>
|
|
</fieldset>
|
|
<strong> <fieldset>
|
|
<legend> Pizza Toppings </legend>
|
|
<p><label> <input type=checkbox> Bacon </label></p>
|
|
<p><label> <input type=checkbox> Extra Cheese </label></p>
|
|
<p><label> <input type=checkbox> Onion </label></p>
|
|
<p><label> <input type=checkbox> Mushroom </label></p>
|
|
</fieldset></strong>
|
|
</form></pre><p>The pizzeria for which this form is being written is always
|
|
making mistakes, so it needs a way to contact the customer. For this
|
|
purpose, we can use form controls specifically for telephone numbers
|
|
(<code><a href="the-input-element.html#the-input-element">input</a></code> elements with their <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute set to <code title="attr-input-type-tel"><a href="states-of-the-type-attribute.html#telephone-state">tel</a></code>) and e-mail addresses
|
|
(<code><a href="the-input-element.html#the-input-element">input</a></code> elements with their <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute set to <code title="attr-input-type-email"><a href="states-of-the-type-attribute.html#e-mail-state">email</a></code>):</p><pre><form>
|
|
<p><label>Customer name: <input></label></p>
|
|
<strong> <p><label>Telephone: <input type=tel></label></p>
|
|
<p><label>E-mail address: <input type=email></label></p></strong>
|
|
<fieldset>
|
|
<legend> Pizza Size </legend>
|
|
<p><label> <input type=radio name=size> Small </label></p>
|
|
<p><label> <input type=radio name=size> Medium </label></p>
|
|
<p><label> <input type=radio name=size> Large </label></p>
|
|
</fieldset>
|
|
<fieldset>
|
|
<legend> Pizza Toppings </legend>
|
|
<p><label> <input type=checkbox> Bacon </label></p>
|
|
<p><label> <input type=checkbox> Extra Cheese </label></p>
|
|
<p><label> <input type=checkbox> Onion </label></p>
|
|
<p><label> <input type=checkbox> Mushroom </label></p>
|
|
</fieldset>
|
|
</form></pre><p>We can use an <code><a href="the-input-element.html#the-input-element">input</a></code> element with its <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute set to <code title="attr-input-type-time"><a href="states-of-the-type-attribute.html#time-state">time</a></code> to ask for a delivery
|
|
time. Many of these form controls have attributes to control exactly
|
|
what values can be specified; in this case, three attributes of
|
|
particular interest are <code title="attr-input-min"><a href="common-input-element-attributes.html#attr-input-min">min</a></code>,
|
|
<code title="attr-input-max"><a href="common-input-element-attributes.html#attr-input-max">max</a></code>, and <code title="attr-input-step"><a href="common-input-element-attributes.html#attr-input-step">step</a></code>. These set the minimum time, the
|
|
maximum time, and the interval between allowed values (in
|
|
seconds). This pizzeria only delivers between 11am and 9pm, and
|
|
doesn't promise anything better than 15 minute increments, which we
|
|
can mark up as follows:</p><pre><form>
|
|
<p><label>Customer name: <input></label></p>
|
|
<p><label>Telephone: <input type=tel></label></p>
|
|
<p><label>E-mail address: <input type=email></label></p>
|
|
<fieldset>
|
|
<legend> Pizza Size </legend>
|
|
<p><label> <input type=radio name=size> Small </label></p>
|
|
<p><label> <input type=radio name=size> Medium </label></p>
|
|
<p><label> <input type=radio name=size> Large </label></p>
|
|
</fieldset>
|
|
<fieldset>
|
|
<legend> Pizza Toppings </legend>
|
|
<p><label> <input type=checkbox> Bacon </label></p>
|
|
<p><label> <input type=checkbox> Extra Cheese </label></p>
|
|
<p><label> <input type=checkbox> Onion </label></p>
|
|
<p><label> <input type=checkbox> Mushroom </label></p>
|
|
</fieldset>
|
|
<strong> <p><label>Preferred delivery time: <input type=time min="11:00" max="21:00" step="900"></label></p></strong>
|
|
</form></pre><p>The <code><a href="the-button-element.html#the-textarea-element">textarea</a></code> element can be used to provide a
|
|
free-form text field. In this instance, we are going to use it to
|
|
provide a space for the customer to give delivery instructions:</p><pre><form>
|
|
<p><label>Customer name: <input></label></p>
|
|
<p><label>Telephone: <input type=tel></label></p>
|
|
<p><label>E-mail address: <input type=email></label></p>
|
|
<fieldset>
|
|
<legend> Pizza Size </legend>
|
|
<p><label> <input type=radio name=size> Small </label></p>
|
|
<p><label> <input type=radio name=size> Medium </label></p>
|
|
<p><label> <input type=radio name=size> Large </label></p>
|
|
</fieldset>
|
|
<fieldset>
|
|
<legend> Pizza Toppings </legend>
|
|
<p><label> <input type=checkbox> Bacon </label></p>
|
|
<p><label> <input type=checkbox> Extra Cheese </label></p>
|
|
<p><label> <input type=checkbox> Onion </label></p>
|
|
<p><label> <input type=checkbox> Mushroom </label></p>
|
|
</fieldset>
|
|
<p><label>Preferred delivery time: <input type=time min="11:00" max="21:00" step="900"></label></p>
|
|
<strong> <p><label>Delivery instructions: <textarea></textarea></label></p></strong>
|
|
</form></pre><p>Finally, to make the form submittable we use the
|
|
<code><a href="the-button-element.html#the-button-element">button</a></code> element:</p><pre><form>
|
|
<p><label>Customer name: <input></label></p>
|
|
<p><label>Telephone: <input type=tel></label></p>
|
|
<p><label>E-mail address: <input type=email></label></p>
|
|
<fieldset>
|
|
<legend> Pizza Size </legend>
|
|
<p><label> <input type=radio name=size> Small </label></p>
|
|
<p><label> <input type=radio name=size> Medium </label></p>
|
|
<p><label> <input type=radio name=size> Large </label></p>
|
|
</fieldset>
|
|
<fieldset>
|
|
<legend> Pizza Toppings </legend>
|
|
<p><label> <input type=checkbox> Bacon </label></p>
|
|
<p><label> <input type=checkbox> Extra Cheese </label></p>
|
|
<p><label> <input type=checkbox> Onion </label></p>
|
|
<p><label> <input type=checkbox> Mushroom </label></p>
|
|
</fieldset>
|
|
<p><label>Preferred delivery time: <input type=time min="11:00" max="21:00" step="900"></label></p>
|
|
<p><label>Delivery instructions: <textarea></textarea></label></p>
|
|
<strong> <p><button>Submit order</button></p></strong>
|
|
</form></pre><h5 id="implementing-the-server-side-processing-for-a-form"><span class="secno">4.10.1.2 </span>Implementing the server-side processing for a form</h5><p><i>This section is non-normative.</i></p><p>The exact details for writing a server-side processor are out of
|
|
scope for this specification. For the purposes of this introduction,
|
|
we will assume that the script at <code title="">https://pizza.example.com/order.cgi</code> is configured to
|
|
accept submissions using the <code title="attr-fs-enctype-urlencoded"><a href="association-of-controls-and-forms.html#attr-fs-enctype-urlencoded">application/x-www-form-urlencoded</a></code>
|
|
format, expecting the following parameters sent in an HTTP POST
|
|
body:</p><dl><dt><code title="">custname</code></dt>
|
|
<dd>Customer's name</dd>
|
|
|
|
<dt><code title="">custtel</code></dt>
|
|
<dd>Customer's telephone number</dd>
|
|
|
|
<dt><code title="">custemail</code></dt>
|
|
<dd>Customer's e-mail address</dd>
|
|
|
|
<dt><code title="">size</code></dt>
|
|
<dd>The pizza size, either <code title="">small</code>, <code title="">medium</code>, or <code title="">large</code></dd>
|
|
|
|
<dt><code title="">toppings</code></dt>
|
|
<dd>The topping, specified once for each selected topping, with the allowed values being <code title="">bacon</code>, <code title="">cheese</code>, <code title="">onion</code>, and <code title="">mushroom</code></dd>
|
|
|
|
<dt><code title="">delivery</code></dt>
|
|
<dd>The requested delivery time</dd>
|
|
|
|
<dt><code title="">comments</code></dt>
|
|
<dd>The delivery instructions</dd>
|
|
|
|
</dl><h5 id="configuring-a-form-to-communicate-with-a-server"><span class="secno">4.10.1.3 </span>Configuring a form to communicate with a server</h5><p><i>This section is non-normative.</i></p><p>Form submissions are exposed to servers in a variety of ways,
|
|
most commonly as HTTP GET or POST requests. To specify the exact
|
|
method used, the <code title="attr-fs-method"><a href="association-of-controls-and-forms.html#attr-fs-method">method</a></code>
|
|
attribute is specified on the <code><a href="#the-form-element">form</a></code> element. This
|
|
doesn't specify how the form data is encoded, though; to specify
|
|
that, you use the <code title="attr-fs-enctype"><a href="association-of-controls-and-forms.html#attr-fs-enctype">enctype</a></code>
|
|
attribute. You also have to specify the <a href="urls.html#url">URL</a> of the
|
|
service that will handle the submitted data, using the <code title="attr-fs-action"><a href="association-of-controls-and-forms.html#attr-fs-action">action</a></code> attribute.</p><p>For each form control you want submitted, you then have to give a
|
|
name that will be used to refer to the data in the submission. We
|
|
already specified the name for the group of radio buttons; the same
|
|
attribute (<code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code>) also specifies
|
|
the submission name. Radio buttons can be distinguished from each
|
|
other in the submission by giving them different values, using the
|
|
<code title="attr-input-value"><a href="the-input-element.html#attr-input-value">value</a></code> attribute.</p><p>Multiple controls can have the same name; for example, here we
|
|
give all the checkboxes the same name, and the server distinguishes
|
|
which checkbox was checked by seeing which values are submitted with
|
|
that name — like the radio buttons, they are also given unique
|
|
values with the <code title="attr-input-value"><a href="the-input-element.html#attr-input-value">value</a></code>
|
|
attribute.</p><p>Given the settings in the previous section, this all becomes:</p><pre><form<strong> method="post"
|
|
enctype="application/x-www-form-urlencoded"
|
|
action="https://pizza.example.com/order.cgi"</strong>>
|
|
<p><label>Customer name: <input<strong> name="custname"</strong>></label></p>
|
|
<p><label>Telephone: <input type=tel<strong> name="custtel"</strong>></label></p>
|
|
<p><label>E-mail address: <input type=email<strong> name="custemail"</strong>></label></p>
|
|
<fieldset>
|
|
<legend> Pizza Size </legend>
|
|
<p><label> <input type=radio name=size<strong> value="small"</strong>> Small </label></p>
|
|
<p><label> <input type=radio name=size<strong> value="medium"</strong>> Medium </label></p>
|
|
<p><label> <input type=radio name=size<strong> value="large"</strong>> Large </label></p>
|
|
</fieldset>
|
|
<fieldset>
|
|
<legend> Pizza Toppings </legend>
|
|
<p><label> <input type=checkbox<strong> name="topping" value="bacon"</strong>> Bacon </label></p>
|
|
<p><label> <input type=checkbox<strong> name="topping" value="cheese"</strong>> Extra Cheese </label></p>
|
|
<p><label> <input type=checkbox<strong> name="topping" value="onion"</strong>> Onion </label></p>
|
|
<p><label> <input type=checkbox<strong> name="topping" value="mushroom"</strong>> Mushroom </label></p>
|
|
</fieldset>
|
|
<p><label>Preferred delivery time: <input type=time min="11:00" max="21:00" step="900"<strong> name="delivery"</strong>></label></p>
|
|
<p><label>Delivery instructions: <textarea<strong> name="comments"</strong>></textarea></label></p>
|
|
<p><button>Submit order</button><p>
|
|
</form></pre><p>For example, if the customer entered "Denise Lawrence" as their
|
|
name, "555-321-8642" as their telephone number, did not specify an
|
|
e-mail address, asked for a medium-sized pizza, selected the Extra
|
|
Cheese and Mushroom toppings, entered a delivery time of 7pm, and
|
|
left the delivery instructions text field blank, the user agent
|
|
would submit the following to the online Web service:</p><pre>custname=Denise+Lawrence&custtel=555-321-8624&custemail=&size=medium&topping=cheese&topping=mushroom&delivery=19%3A00&comments=</pre><h5 id="client-side-form-validation"><span class="secno">4.10.1.4 </span>Client-side form validation</h5><p><i>This section is non-normative.</i></p><p>Forms can be annotated in such a way that the user agent will
|
|
check the user's input before the form is submitted. The server
|
|
still has to verify the input is valid (since hostile users can
|
|
easily bypass the form validation), but it allows the user to avoid
|
|
the wait incurred by having the server be the sole checker of the
|
|
user's input.</p><p>The simplest annotation is the <code title="attr-input-required"><a href="common-input-element-attributes.html#attr-input-required">required</a></code> attribute, which can be
|
|
specified on <code><a href="the-input-element.html#the-input-element">input</a></code> elements to indicate that the form
|
|
is not to be submitted until a value is given. By adding this
|
|
attribute to the customer name and delivery time fields, we allow
|
|
the user agent to notify the user when the user submits the form
|
|
without filling in those fields:</p><pre><form method="post"
|
|
enctype="application/x-www-form-urlencoded"
|
|
action="https://pizza.example.com/order.cgi">
|
|
<p><label>Customer name: <input name="custname"<strong> required</strong>></label></p>
|
|
<p><label>Telephone: <input type=tel name="custtel"></label></p>
|
|
<p><label>E-mail address: <input type=email name="custemail"></label></p>
|
|
<fieldset>
|
|
<legend> Pizza Size </legend>
|
|
<p><label> <input type=radio name=size value="small"> Small </label></p>
|
|
<p><label> <input type=radio name=size value="medium"> Medium </label></p>
|
|
<p><label> <input type=radio name=size value="large"> Large </label></p>
|
|
</fieldset>
|
|
<fieldset>
|
|
<legend> Pizza Toppings </legend>
|
|
<p><label> <input type=checkbox name="topping" value="bacon"> Bacon </label></p>
|
|
<p><label> <input type=checkbox name="topping" value="cheese"> Extra Cheese </label></p>
|
|
<p><label> <input type=checkbox name="topping" value="onion"> Onion </label></p>
|
|
<p><label> <input type=checkbox name="topping" value="mushroom"> Mushroom </label></p>
|
|
</fieldset>
|
|
<p><label>Preferred delivery time: <input type=time min="11:00" max="21:00" step="900" name="delivery"<strong> required</strong>></label></p>
|
|
<p><label>Delivery instructions: <textarea name="comments"></textarea></label></p>
|
|
<p><button>Submit order</button><p>
|
|
</form></pre><p>It is also possible to limit the length of the input, using the
|
|
<code title="attr-fe-maxlength"><a href="association-of-controls-and-forms.html#attr-fe-maxlength">maxlength</a></code> attribute. By
|
|
adding this to the <code><a href="the-button-element.html#the-textarea-element">textarea</a></code> element, we can limit users
|
|
to 1000 characters, preventing them from writing huge essays to the
|
|
busy delivery drivers instead of staying focused and to the
|
|
point:</p><pre><form method="post"
|
|
enctype="application/x-www-form-urlencoded"
|
|
action="https://pizza.example.com/order.cgi">
|
|
<p><label>Customer name: <input name="custname" required></label></p>
|
|
<p><label>Telephone: <input type=tel name="custtel"></label></p>
|
|
<p><label>E-mail address: <input type=email name="custemail"></label></p>
|
|
<fieldset>
|
|
<legend> Pizza Size </legend>
|
|
<p><label> <input type=radio name=size value="small"> Small </label></p>
|
|
<p><label> <input type=radio name=size value="medium"> Medium </label></p>
|
|
<p><label> <input type=radio name=size value="large"> Large </label></p>
|
|
</fieldset>
|
|
<fieldset>
|
|
<legend> Pizza Toppings </legend>
|
|
<p><label> <input type=checkbox name="topping" value="bacon"> Bacon </label></p>
|
|
<p><label> <input type=checkbox name="topping" value="cheese"> Extra Cheese </label></p>
|
|
<p><label> <input type=checkbox name="topping" value="onion"> Onion </label></p>
|
|
<p><label> <input type=checkbox name="topping" value="mushroom"> Mushroom </label></p>
|
|
</fieldset>
|
|
<p><label>Preferred delivery time: <input type=time min="11:00" max="21:00" step="900" name="delivery" required></label></p>
|
|
<p><label>Delivery instructions: <textarea name="comments"<strong> maxlength=1000</strong>></textarea></label></p>
|
|
<p><button>Submit order</button><p>
|
|
</form></pre><h4 id="categories"><span class="secno">4.10.2 </span>Categories</h4><p>Mostly for historical reasons, elements in this section fall into
|
|
several overlapping (but subtly different) categories in addition to
|
|
the usual ones like <a href="content-models.html#flow-content">flow content</a>, <a href="content-models.html#phrasing-content">phrasing
|
|
content</a>, and <a href="content-models.html#interactive-content">interactive content</a>.</p><p>A number of the elements are <dfn id="form-associated-element" title="form-associated
|
|
element">form-associated elements</dfn>, which means they can have a
|
|
<a href="association-of-controls-and-forms.html#form-owner">form owner</a> and, to expose this, have a <code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code> content attribute with a matching
|
|
<code title="dom-fae-form"><a href="association-of-controls-and-forms.html#dom-fae-form">form</a></code> IDL attribute.</p><ul class="brief category-list"><li><code><a href="the-button-element.html#the-button-element">button</a></code></li>
|
|
<li><code><a href="#the-fieldset-element">fieldset</a></code></li>
|
|
<li><code><a href="the-input-element.html#the-input-element">input</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-keygen-element">keygen</a></code></li>
|
|
<li><code><a href="#the-label-element">label</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-meter-element">meter</a></code></li>
|
|
<li><code><a href="the-iframe-element.html#the-object-element">object</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-output-element">output</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-progress-element">progress</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-select-element">select</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-textarea-element">textarea</a></code></li>
|
|
</ul><p>The <a href="#form-associated-element" title="form-associated element">form-associated
|
|
elements</a> fall into several subcategories:</p><dl><dt><dfn id="category-listed" title="category-listed">Listed elements</dfn></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Denotes elements that are listed in the <code title="dom-form-elements"><a href="#dom-form-elements"><var title="">form</var>.elements</a></code>
|
|
and <code title="dom-fieldset-elements"><a href="#dom-fieldset-elements"><var title="">fieldset</var>.elements</a></code> APIs.</p>
|
|
|
|
|
|
<ul class="brief category-list"><li><code><a href="the-button-element.html#the-button-element">button</a></code></li>
|
|
<li><code><a href="#the-fieldset-element">fieldset</a></code></li>
|
|
<li><code><a href="the-input-element.html#the-input-element">input</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-keygen-element">keygen</a></code></li>
|
|
<li><code><a href="the-iframe-element.html#the-object-element">object</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-output-element">output</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-select-element">select</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-textarea-element">textarea</a></code></li>
|
|
</ul></dd>
|
|
|
|
<dt><dfn id="category-label" title="category-label">Labelable elements</dfn></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Denotes elements that can be associated with <code><a href="#the-label-element">label</a></code>
|
|
elements.</p>
|
|
|
|
|
|
<ul class="brief category-list"><li><code><a href="the-button-element.html#the-button-element">button</a></code></li>
|
|
<li><code><a href="the-input-element.html#the-input-element">input</a></code> (if the <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute is <em>not</em> in the <a href="states-of-the-type-attribute.html#hidden-state" title="attr-input-type-hidden">Hidden</a> state)</li>
|
|
<li><code><a href="the-button-element.html#the-keygen-element">keygen</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-meter-element">meter</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-output-element">output</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-progress-element">progress</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-select-element">select</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-textarea-element">textarea</a></code></li>
|
|
</ul></dd>
|
|
|
|
<dt><dfn id="category-submit" title="category-submit">Submittable elements</dfn></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Denotes elements that can be used for <a href="association-of-controls-and-forms.html#constructing-form-data-set">constructing the form data
|
|
set</a> when a <code><a href="#the-form-element">form</a></code> element is <a href="association-of-controls-and-forms.html#concept-form-submit" title="concept-form-submit">submitted</a>.</p>
|
|
|
|
|
|
<ul class="brief category-list"><li><code><a href="the-button-element.html#the-button-element">button</a></code></li>
|
|
<li><code><a href="the-input-element.html#the-input-element">input</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-keygen-element">keygen</a></code></li>
|
|
<li><code><a href="the-iframe-element.html#the-object-element">object</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-select-element">select</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-textarea-element">textarea</a></code></li>
|
|
</ul></dd>
|
|
|
|
<dt><dfn id="category-reset" title="category-reset">Resettable elements</dfn></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Denotes elements that can be affected when a <code><a href="#the-form-element">form</a></code>
|
|
element is <a href="association-of-controls-and-forms.html#concept-form-reset" title="concept-form-reset">reset</a>.</p>
|
|
|
|
|
|
<ul class="brief category-list"><li><code><a href="the-input-element.html#the-input-element">input</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-keygen-element">keygen</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-output-element">output</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-select-element">select</a></code></li>
|
|
<li><code><a href="the-button-element.html#the-textarea-element">textarea</a></code></li>
|
|
</ul></dd>
|
|
|
|
</dl><p>In addition, some <a href="#category-submit" title="category-submit">submittable
|
|
elements</a> can be, depending on their attributes, <dfn id="concept-button" title="concept-button">buttons</dfn>. The prose below defines when
|
|
an element is a button. Some buttons are specifically <dfn id="concept-submit-button" title="concept-submit-button">submit buttons</dfn>.</p><p class="note">The <code><a href="the-iframe-element.html#the-object-element">object</a></code> element is also a
|
|
<a href="#form-associated-element">form-associated element</a> and can, with the use of a
|
|
suitable <a href="infrastructure.html#plugin">plugin</a>, partake in <a href="association-of-controls-and-forms.html#form-submission">form
|
|
submission</a>.</p><h4 id="the-form-element"><span class="secno">4.10.3 </span>The <dfn><code>form</code></dfn> element</h4><dl class="element"><dt>Categories</dt>
|
|
<dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
|
|
<dt>Contexts in which this element can be used:</dt>
|
|
<dd>Where <a href="content-models.html#flow-content">flow content</a> is expected.</dd>
|
|
<dt>Content model:</dt>
|
|
<dd><a href="content-models.html#flow-content">Flow content</a>, but with no <code><a href="#the-form-element">form</a></code> element descendants.</dd>
|
|
<dt>Content attributes:</dt>
|
|
<dd><a href="elements.html#global-attributes">Global attributes</a></dd>
|
|
<dd><code title="attr-form-accept-charset"><a href="#attr-form-accept-charset">accept-charset</a></code></dd>
|
|
<dd><code title="attr-fs-action"><a href="association-of-controls-and-forms.html#attr-fs-action">action</a></code></dd>
|
|
<dd><code title="attr-form-autocomplete"><a href="#attr-form-autocomplete">autocomplete</a></code></dd>
|
|
<dd><code title="attr-fs-enctype"><a href="association-of-controls-and-forms.html#attr-fs-enctype">enctype</a></code></dd>
|
|
<dd><code title="attr-fs-method"><a href="association-of-controls-and-forms.html#attr-fs-method">method</a></code></dd>
|
|
<dd><code title="attr-form-name"><a href="#attr-form-name">name</a></code></dd>
|
|
<dd><code title="attr-fs-novalidate"><a href="association-of-controls-and-forms.html#attr-fs-novalidate">novalidate</a></code></dd>
|
|
<dd><code title="attr-fs-target"><a href="association-of-controls-and-forms.html#attr-fs-target">target</a></code></dd>
|
|
<dt>DOM interface:</dt>
|
|
<dd>
|
|
<pre class="idl">[OverrideBuiltins]
|
|
interface <dfn id="htmlformelement">HTMLFormElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
|
|
attribute DOMString <a href="#dom-form-acceptcharset" title="dom-form-acceptCharset">acceptCharset</a>;
|
|
attribute DOMString <a href="association-of-controls-and-forms.html#dom-fs-action" title="dom-fs-action">action</a>;
|
|
attribute DOMString <a href="#dom-form-autocomplete" title="dom-form-autocomplete">autocomplete</a>;
|
|
attribute DOMString <a href="association-of-controls-and-forms.html#dom-fs-enctype" title="dom-fs-enctype">enctype</a>;
|
|
attribute DOMString <a href="association-of-controls-and-forms.html#dom-fs-encoding" title="dom-fs-encoding">encoding</a>;
|
|
attribute DOMString <a href="association-of-controls-and-forms.html#dom-fs-method" title="dom-fs-method">method</a>;
|
|
attribute DOMString <a href="#dom-form-name" title="dom-form-name">name</a>;
|
|
attribute boolean <a href="association-of-controls-and-forms.html#dom-fs-novalidate" title="dom-fs-noValidate">noValidate</a>;
|
|
attribute DOMString <a href="association-of-controls-and-forms.html#dom-fs-target" title="dom-fs-target">target</a>;
|
|
|
|
readonly attribute <a href="common-dom-interfaces.html#htmlformcontrolscollection">HTMLFormControlsCollection</a> <a href="#dom-form-elements" title="dom-form-elements">elements</a>;
|
|
readonly attribute long <a href="#dom-form-length" title="dom-form-length">length</a>;
|
|
caller <a href="#dom-form-item" title="dom-form-item">getter</a> any (in unsigned long index);
|
|
caller <a href="#dom-form-nameditem" title="dom-form-namedItem">getter</a> any (in DOMString name);
|
|
|
|
void <a href="#dom-form-submit" title="dom-form-submit">submit</a>();
|
|
void <a href="#dom-form-reset" title="dom-form-reset">reset</a>();
|
|
boolean <a href="#dom-form-checkvalidity" title="dom-form-checkValidity">checkValidity</a>();
|
|
};</pre>
|
|
</dd>
|
|
</dl><p>The <code><a href="#the-form-element">form</a></code> element <a href="rendering.html#represents">represents</a> a
|
|
collection of <a href="#form-associated-element" title="form-associated element">form-associated
|
|
elements</a>, some of which can represent editable values that
|
|
can be submitted to a server for processing.</p><p>The <dfn id="attr-form-accept-charset" title="attr-form-accept-charset"><code>accept-charset</code></dfn>
|
|
attribute gives the character encodings that are to be used for the
|
|
submission. If specified, the value must be an <a href="common-microsyntaxes.html#ordered-set-of-unique-space-separated-tokens">ordered set of
|
|
unique space-separated tokens</a> that are <a href="infrastructure.html#ascii-case-insensitive">ASCII
|
|
case-insensitive</a>, and each token must be an <a href="infrastructure.html#ascii-case-insensitive">ASCII
|
|
case-insensitive</a> match for the <a href="infrastructure.html#preferred-mime-name">preferred MIME
|
|
name</a> of an <a href="infrastructure.html#ascii-compatible-character-encoding">ASCII-compatible character encoding</a>.
|
|
<a href="references.html#refsIANACHARSET">[IANACHARSET]</a></p><p>The <dfn id="attr-form-name" title="attr-form-name"><code>name</code></dfn> attribute
|
|
represents the <code><a href="#the-form-element">form</a></code>'s name within the <code title="dom-document-forms"><a href="dom.html#dom-document-forms">forms</a></code> collection. The value must
|
|
not be the empty string, and the value must be unique amongst the
|
|
<code><a href="#the-form-element">form</a></code> elements in the <code title="dom-document-forms"><a href="dom.html#dom-document-forms">forms</a></code> collection that it is in, if
|
|
any.</p><p>The <dfn id="attr-form-autocomplete" title="attr-form-autocomplete"><code>autocomplete</code></dfn>
|
|
attribute is an <a href="common-microsyntaxes.html#enumerated-attribute">enumerated attribute</a>. The attribute has
|
|
two states. The <code title="attr-form-autocomplete-on">on</code>
|
|
keyword maps to the <dfn id="attr-form-autocomplete-on-state" title="attr-form-autocomplete-on-state">on</dfn> state, and the
|
|
<code title="attr-form-autocomplete-off">off</code> keyword maps to
|
|
the <dfn id="attr-form-autocomplete-off-state" title="attr-form-autocomplete-off-state">off</dfn>
|
|
state. The attribute may also be omitted. The <i>missing value
|
|
default</i> is the <a href="#attr-form-autocomplete-on-state" title="attr-form-autocomplete-on-state">on</a> state. The <a href="#attr-form-autocomplete-off-state" title="attr-form-autocomplete-off-state">off</a> state indicates
|
|
that by default, <code><a href="the-input-element.html#the-input-element">input</a></code> elements in the form will have
|
|
their <a href="common-input-element-attributes.html#resulting-autocompletion-state">resulting autocompletion state</a> set to <i title="">off</i>; the <a href="#attr-form-autocomplete-on-state" title="attr-form-autocomplete-on-state">on</a> state indicates
|
|
that by default, <code><a href="the-input-element.html#the-input-element">input</a></code> elements in the form will have
|
|
their <a href="common-input-element-attributes.html#resulting-autocompletion-state">resulting autocompletion state</a> set to <i title="">on</i>.</p><p>The <code title="attr-fs-action"><a href="association-of-controls-and-forms.html#attr-fs-action">action</a></code>, <code title="attr-fs-enctype"><a href="association-of-controls-and-forms.html#attr-fs-enctype">enctype</a></code>, <code title="attr-fs-method"><a href="association-of-controls-and-forms.html#attr-fs-method">method</a></code>, <code title="attr-fs-novalidate"><a href="association-of-controls-and-forms.html#attr-fs-novalidate">novalidate</a></code>, and <code title="attr-fs-target"><a href="association-of-controls-and-forms.html#attr-fs-target">target</a></code> attributes are <a href="association-of-controls-and-forms.html#attributes-for-form-submission">attributes
|
|
for form submission</a>.</p><dl class="domintro"><dt><var title="">form</var> . <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns an <code><a href="common-dom-interfaces.html#htmlcollection">HTMLCollection</a></code> of the form controls in
|
|
the form (excluding image buttons for historical reasons).</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">form</var> . <code title="dom-form-length"><a href="#dom-form-length">length</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the number of form controls in the form (excluding
|
|
image buttons for historical reasons).</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">form</var>[<var title="">index</var>]</dt>
|
|
<dt><var title="">form</var>(<var title="">index</var>)</dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the <var title="">index</var>th element in the form
|
|
(excluding image buttons for historical reasons).</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">form</var>[<var title="">name</var>]</dt>
|
|
<dt><var title="">form</var>(<var title="">name</var>)</dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the form control in the form with the given <a href="elements.html#concept-id" title="concept-id">ID</a> or <code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code> (excluding image buttons for
|
|
historical reasons).</p>
|
|
|
|
<p>Once an element has been referenced using a particular name,
|
|
that name will continue being available as a way to reference that
|
|
element in this method, even if the element's actual <a href="elements.html#concept-id" title="concept-id">ID</a> or <code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code> changes, for as long as the
|
|
element remains in the <code><a href="infrastructure.html#document">Document</a></code>.</p>
|
|
|
|
<p>If there are multiple matching items, then a
|
|
<code><a href="infrastructure.html#nodelist">NodeList</a></code> object containing all those elements is
|
|
returned.</p>
|
|
|
|
<p>Returns null if no element with that <a href="elements.html#concept-id" title="concept-id">ID</a> or <code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code> could be found.</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">form</var> . <code title="dom-form-submit"><a href="#dom-form-submit">submit</a></code>()</dt>
|
|
|
|
<dd>
|
|
|
|
<p>Submits the form.</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">form</var> . <code title="dom-form-reset"><a href="#dom-form-reset">reset</a></code>()</dt>
|
|
|
|
<dd>
|
|
|
|
<p>Resets the form.</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">form</var> . <code title="dom-form-checkValidity"><a href="#dom-form-checkvalidity">checkValidity</a></code>()</dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns true if the form's controls are all valid; otherwise,
|
|
returns false.</p>
|
|
|
|
</dd>
|
|
|
|
</dl><div class="impl">
|
|
|
|
<p>The <dfn id="dom-form-autocomplete" title="dom-form-autocomplete"><code>autocomplete</code></dfn> IDL
|
|
attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the content attribute of the
|
|
same name, <a href="common-dom-interfaces.html#limited-to-only-known-values">limited to only known values</a>.</p>
|
|
|
|
<p>The <dfn id="dom-form-name" title="dom-form-name"><code>name</code></dfn> IDL
|
|
attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the content attribute of the
|
|
same name.</p>
|
|
|
|
<p>The <dfn id="dom-form-acceptcharset" title="dom-form-acceptCharset"><code>acceptCharset</code></dfn> IDL
|
|
attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the <code title="attr-form-accept-charset"><a href="#attr-form-accept-charset">accept-charset</a></code> content
|
|
attribute.</p>
|
|
|
|
<hr><p>The <dfn id="dom-form-elements" title="dom-form-elements"><code>elements</code></dfn>
|
|
IDL attribute must return an <code><a href="common-dom-interfaces.html#htmlformcontrolscollection">HTMLFormControlsCollection</a></code>
|
|
rooted at the <code><a href="infrastructure.html#document">Document</a></code> node, whose filter matches <a href="#category-listed" title="category-listed">listed elements</a> whose <a href="association-of-controls-and-forms.html#form-owner">form
|
|
owner</a> is the <code><a href="#the-form-element">form</a></code> element, with the exception of
|
|
<code><a href="the-input-element.html#the-input-element">input</a></code> elements whose <code title="attr-input-type"><a href="the-input-element.html#attr-input-type">type</a></code> attribute is in the <a href="number-state.html#image-button-state" title="attr-input-type-image">Image Button</a> state, which must,
|
|
for historical reasons, be excluded from this particular
|
|
collection.</p>
|
|
|
|
<p>The <dfn id="dom-form-length" title="dom-form-length"><code>length</code></dfn> IDL
|
|
attribute must return the number of nodes <a href="common-dom-interfaces.html#represented-by-the-collection" title="represented
|
|
by the collection">represented</a> by the <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code> collection.</p>
|
|
|
|
<p>The <a href="infrastructure.html#supported-property-indices">supported property indices</a> at any instant are
|
|
the indices supported by the object returned by the <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code> attribute at that
|
|
instant.</p>
|
|
|
|
<p>When a <code><a href="#the-form-element">form</a></code> element is <dfn id="dom-form-item" title="dom-form-item">indexed for indexed property retrieval</dfn>,
|
|
the user agent must return the value returned by the <code title="dom-HTMLFormControlsCollection-item">item</code> method on
|
|
the <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code> collection, when
|
|
invoked with the given index as its argument.</p>
|
|
|
|
<p>Each <code><a href="#the-form-element">form</a></code> element has a mapping of names to elements
|
|
called the <dfn id="past-names-map">past names map</dfn>. It is used to persist names of
|
|
controls even when they change names.</p>
|
|
|
|
<p>The <a href="infrastructure.html#supported-property-names">supported property names</a> are the union of the
|
|
names currently supported by the object returned by the <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code> attribute, and the names
|
|
currently in the <a href="#past-names-map">past names map</a>.</p>
|
|
|
|
<p>When a <code><a href="#the-form-element">form</a></code> element is <dfn id="dom-form-nameditem" title="dom-form-namedItem">indexed for named property
|
|
retrieval</dfn>, the user agent must run the following steps:</p>
|
|
|
|
<ol><li>
|
|
|
|
<p>If <var title="">name</var> is one of the <a href="infrastructure.html#supported-property-names">supported
|
|
property names</a> of the object returned by the <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code> attribute, then run
|
|
these substeps:</p>
|
|
|
|
<ol><li><p>Let <var title="">candidate</var> be the object returned
|
|
by the <code title="dom-HTMLFormControlsCollection-namedItem"><a href="common-dom-interfaces.html#dom-htmlformcontrolscollection-nameditem">namedItem()</a></code>
|
|
method on the object returned by the <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code> attribute when passed
|
|
the <var title="">name</var> argument.</p></li>
|
|
|
|
<li><p>If <var title="">candidate</var> is an element, then add a
|
|
mapping from <var title="">name</var> to <var title="">candidate</var> in the <code><a href="#the-form-element">form</a></code> element's
|
|
<a href="#past-names-map">past names map</a>, replacing the previous entry with
|
|
the same name, if any.</p></li>
|
|
|
|
<li><p>Return <var title="">candidate</var> and abort these
|
|
steps.</p></li>
|
|
|
|
</ol></li>
|
|
|
|
<li><p>Otherwise, <var title="">name</var> is the name of one of
|
|
the entries in the <code><a href="#the-form-element">form</a></code> element's <a href="#past-names-map">past names
|
|
map</a>: return the object associated with <var title="">name</var> in that map.</p></li>
|
|
|
|
</ol><p>If an element listed in the <code><a href="#the-form-element">form</a></code> element's <a href="#past-names-map">past
|
|
names map</a> is removed from the <code><a href="infrastructure.html#document">Document</a></code>, then its
|
|
entries must be removed from the map.</p>
|
|
|
|
|
|
<hr><p>The <dfn id="dom-form-submit" title="dom-form-submit"><code>submit()</code></dfn>
|
|
method, when invoked, must <a href="association-of-controls-and-forms.html#concept-form-submit" title="concept-form-submit">submit</a> the <code><a href="#the-form-element">form</a></code>
|
|
element from the <code><a href="#the-form-element">form</a></code> element itself, with the <var title="">scripted-submit</var> flag set.</p>
|
|
|
|
<p>The <dfn id="dom-form-reset" title="dom-form-reset"><code>reset()</code></dfn>
|
|
method, when invoked, must run the following steps:</p>
|
|
|
|
<ol><li><p>If the <code><a href="#the-form-element">form</a></code> element is marked as <i><a href="#locked-for-reset">locked for
|
|
reset</a></i>, then abort these steps.</p></li>
|
|
|
|
<li><p>Mark the <code><a href="#the-form-element">form</a></code> element as <dfn id="locked-for-reset">locked for
|
|
reset</dfn>.</p></li>
|
|
|
|
<li><p><a href="association-of-controls-and-forms.html#concept-form-reset" title="concept-form-reset">Reset</a> the
|
|
<code><a href="#the-form-element">form</a></code> element.</p></li>
|
|
|
|
<li><p>Unmark the <code><a href="#the-form-element">form</a></code> element as <i><a href="#locked-for-reset">locked for
|
|
reset</a></i>.</p></li>
|
|
|
|
</ol><p>If the <dfn id="dom-form-checkvalidity" title="dom-form-checkValidity"><code>checkValidity()</code></dfn>
|
|
method is invoked, the user agent must <a href="association-of-controls-and-forms.html#statically-validate-the-constraints">statically validate the
|
|
constraints</a> of the <code><a href="#the-form-element">form</a></code> element, and return true
|
|
if the constraint validation return a <i>positive</i> result, and
|
|
false if it returned a <i>negative</i> result.</p>
|
|
|
|
</div><div class="example">
|
|
|
|
<p>This example shows two search forms:</p>
|
|
|
|
<pre><form action="http://www.google.com/search" method="get">
|
|
<label>Google: <input type="search" name="q"></label> <input type="submit" value="Search...">
|
|
</form>
|
|
<form action="http://www.bing.com/search" method="get">
|
|
<label>Bing: <input type="search" name="q"></label> <input type="submit" value="Search...">
|
|
</form></pre>
|
|
|
|
</div><h4 id="the-fieldset-element"><span class="secno">4.10.4 </span>The <dfn><code>fieldset</code></dfn> element</h4><dl class="element"><dt>Categories</dt>
|
|
<dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
|
|
<dd><a href="sections.html#sectioning-root">Sectioning root</a>.</dd>
|
|
<dd><a href="#category-listed" title="category-listed">Listed</a> <a href="#form-associated-element">form-associated element</a>.</dd>
|
|
<dt>Contexts in which this element can be used:</dt>
|
|
<dd>Where <a href="content-models.html#flow-content">flow content</a> is expected.</dd>
|
|
<dt>Content model:</dt>
|
|
<dd>Optionally a <code><a href="#the-legend-element">legend</a></code> element, followed by <a href="content-models.html#flow-content">flow content</a>.</dd>
|
|
<dt>Content attributes:</dt>
|
|
<dd><a href="elements.html#global-attributes">Global attributes</a></dd>
|
|
<dd><code title="attr-fieldset-disabled"><a href="#attr-fieldset-disabled">disabled</a></code></dd>
|
|
<dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
|
|
<dd><code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code></dd>
|
|
<dt>DOM interface:</dt>
|
|
<dd>
|
|
<pre class="idl">interface <dfn id="htmlfieldsetelement">HTMLFieldSetElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
|
|
attribute boolean <a href="#dom-fieldset-disabled" title="dom-fieldset-disabled">disabled</a>;
|
|
readonly attribute <a href="#htmlformelement">HTMLFormElement</a> <a href="association-of-controls-and-forms.html#dom-fae-form" title="dom-fae-form">form</a>;
|
|
attribute DOMString <a href="association-of-controls-and-forms.html#dom-fe-name" title="dom-fe-name">name</a>;
|
|
|
|
readonly attribute DOMString <a href="#dom-fieldset-type" title="dom-fieldset-type">type</a>;
|
|
|
|
readonly attribute <a href="common-dom-interfaces.html#htmlformcontrolscollection">HTMLFormControlsCollection</a> <a href="#dom-fieldset-elements" title="dom-fieldset-elements">elements</a>;
|
|
|
|
readonly attribute boolean <a href="association-of-controls-and-forms.html#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
|
|
readonly attribute <a href="association-of-controls-and-forms.html#validitystate">ValidityState</a> <a href="association-of-controls-and-forms.html#dom-cva-validity" title="dom-cva-validity">validity</a>;
|
|
readonly attribute DOMString <a href="association-of-controls-and-forms.html#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
|
|
boolean <a href="association-of-controls-and-forms.html#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
|
|
void <a href="association-of-controls-and-forms.html#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(in DOMString error);
|
|
};</pre>
|
|
</dd>
|
|
</dl><p>The <code><a href="#the-fieldset-element">fieldset</a></code> element <a href="rendering.html#represents">represents</a> a set
|
|
of form controls optionally grouped under a common name.</p><p>The name of the group is given by the first <code><a href="#the-legend-element">legend</a></code>
|
|
element that is a child of the <code><a href="#the-fieldset-element">fieldset</a></code> element, if
|
|
any. The remainder of the descendants form the group.</p><p>The <dfn id="attr-fieldset-disabled" title="attr-fieldset-disabled"><code>disabled</code></dfn>
|
|
attribute, when specified, causes all the form control descendants
|
|
of the <code><a href="#the-fieldset-element">fieldset</a></code> element, excluding those that are
|
|
descendants of the <code><a href="#the-fieldset-element">fieldset</a></code> element's first
|
|
<code><a href="#the-legend-element">legend</a></code> element child, if any, to be <a href="association-of-controls-and-forms.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a>.</p><p>The <code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code> attribute is used to
|
|
explicitly associate the <code><a href="#the-fieldset-element">fieldset</a></code> element with its
|
|
<a href="association-of-controls-and-forms.html#form-owner">form owner</a>. The <code title="attr-fe-name"><a href="association-of-controls-and-forms.html#attr-fe-name">name</a></code>
|
|
attribute represents the element's name.</p><dl class="domintro"><dt><var title="">fieldset</var> . <code title="dom-fieldset-type"><a href="#dom-fieldset-type">type</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the string "fieldset".</p>
|
|
|
|
</dd>
|
|
|
|
<dt><var title="">fieldset</var> . <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns an <code><a href="common-dom-interfaces.html#htmlformcontrolscollection">HTMLFormControlsCollection</a></code> of the form
|
|
controls in the element.</p>
|
|
|
|
</dd>
|
|
|
|
</dl><div class="impl">
|
|
|
|
<p>The <dfn id="dom-fieldset-disabled" title="dom-fieldset-disabled"><code>disabled</code></dfn> IDL
|
|
attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the content attribute of the
|
|
same name.</p>
|
|
|
|
<p>The <dfn id="dom-fieldset-type" title="dom-fieldset-type"><code>type</code></dfn> IDL
|
|
attribute must return the string "<code title="">fieldset</code>".</p>
|
|
|
|
<p>The <dfn id="dom-fieldset-elements" title="dom-fieldset-elements"><code>elements</code></dfn> IDL
|
|
attribute must return an <code><a href="common-dom-interfaces.html#htmlformcontrolscollection">HTMLFormControlsCollection</a></code>
|
|
rooted at the <code><a href="#the-fieldset-element">fieldset</a></code> element, whose filter matches
|
|
<a href="#category-listed" title="category-listed">listed elements</a>.</p>
|
|
|
|
<p>The <code title="dom-cva-willValidate"><a href="association-of-controls-and-forms.html#dom-cva-willvalidate">willValidate</a></code>, <code title="dom-cva-validity"><a href="association-of-controls-and-forms.html#dom-cva-validity">validity</a></code>, and <code title="dom-cva-validationMessage"><a href="association-of-controls-and-forms.html#dom-cva-validationmessage">validationMessage</a></code>
|
|
attributes, and the <code title="dom-cva-checkValidatity"><a href="association-of-controls-and-forms.html#dom-cva-checkvalidatity">checkValidity()</a></code> and <code title="dom-cva-setCustomValidity"><a href="association-of-controls-and-forms.html#dom-cva-setcustomvalidity">setCustomValidity()</a></code>
|
|
methods, are part of the <a href="association-of-controls-and-forms.html#the-constraint-validation-api">constraint validation API</a>. The
|
|
<code title="dom-fae-form"><a href="association-of-controls-and-forms.html#dom-fae-form">form</a></code> and <code title="dom-fe-name"><a href="association-of-controls-and-forms.html#dom-fe-name">name</a></code> IDL attributes are part of the
|
|
element's forms API.</p>
|
|
|
|
<p><strong>Constraint validation</strong>: <code><a href="#the-fieldset-element">fieldset</a></code>
|
|
elements are always <a href="association-of-controls-and-forms.html#barred-from-constraint-validation">barred from constraint
|
|
validation</a>.</p>
|
|
|
|
</div><div class="example">
|
|
|
|
<p>The following snippet shows a fieldset with a checkbox in the
|
|
legend that controls whether or not the fieldset is enabled. The
|
|
contents of the fieldset consist of two required text fields and an
|
|
optional year/month control.</p>
|
|
|
|
<pre><fieldset name="clubfields" disabled>
|
|
<legend> <label>
|
|
<input type=checkbox name=club onchange="form.clubfields.disabled = !checked">
|
|
Use Club Card
|
|
</label> </legend>
|
|
<p><label>Name on card: <input name=clubname required></label></p>
|
|
<p><label>Card number: <input name=clubnum required pattern="[-0-9]+"></label></p>
|
|
<p><label>Expiry date: <input name=clubexp type=month></label></p>
|
|
</fieldset></pre>
|
|
|
|
</div><div class="example">
|
|
|
|
<p>You can also nest <code><a href="#the-fieldset-element">fieldset</a></code> elements. Here is an
|
|
example expanding on the previous one that does so:</p>
|
|
|
|
<pre><fieldset name="clubfields" disabled>
|
|
<legend> <label>
|
|
<input type=checkbox name=club onchange="form.clubfields.disabled = !checked">
|
|
Use Club Card
|
|
</label> </legend>
|
|
<p><label>Name on card: <input name=clubname required></label></p>
|
|
<fieldset name="numfields">
|
|
<legend> <label>
|
|
<input type=radio checked name=clubtype onchange="form.numfields.disabled = !checked">
|
|
My card has numbers on it
|
|
</label> </legend>
|
|
<p><label>Card number: <input name=clubnum required pattern="[-0-9]+"></label></p>
|
|
</fieldset>
|
|
<fieldset name="letfields" disabled>
|
|
<legend> <label>
|
|
<input type=radio name=clubtype onchange="form.letfields.disabled = !checked">
|
|
My card has letters on it
|
|
</label> </legend>
|
|
<p><label>Card code: <input name=clublet required pattern="[A-Za-z]+"></label></p>
|
|
</fieldset>
|
|
</fieldset></pre>
|
|
|
|
<p>In this example, if the outer "Use Club Card" checkbox is not
|
|
checked, everything inside the outer <code><a href="#the-fieldset-element">fieldset</a></code>,
|
|
including the two radio buttons in the legends of the two nested
|
|
<code><a href="#the-fieldset-element">fieldset</a></code>s, will be disabled. However, if the checkbox
|
|
is checked, then the radio buttons will both be enabled and will
|
|
let you select which of the two inner <code><a href="#the-fieldset-element">fieldset</a></code>s is to
|
|
be enabled.</p>
|
|
|
|
</div><h4 id="the-legend-element"><span class="secno">4.10.5 </span>The <dfn><code>legend</code></dfn> element</h4><dl class="element"><dt>Categories</dt>
|
|
<dd>None.</dd>
|
|
<dt>Contexts in which this element can be used:</dt>
|
|
<dd>As the first child of a <code><a href="#the-fieldset-element">fieldset</a></code> element.</dd>
|
|
<dt>Content model:</dt>
|
|
<dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
|
|
<dt>Content attributes:</dt>
|
|
<dd><a href="elements.html#global-attributes">Global attributes</a></dd>
|
|
<dt>DOM interface:</dt>
|
|
<dd>
|
|
<pre class="idl">interface <dfn id="htmllegendelement">HTMLLegendElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
|
|
readonly attribute <a href="#htmlformelement">HTMLFormElement</a> <a href="#dom-legend-form" title="dom-legend-form">form</a>;
|
|
};</pre>
|
|
</dd>
|
|
</dl><p>The <code><a href="#the-legend-element">legend</a></code> element <a href="rendering.html#represents">represents</a> a caption
|
|
for the rest of the contents of the <code><a href="#the-legend-element">legend</a></code> element's
|
|
parent <code><a href="#the-fieldset-element">fieldset</a></code> element<span class="impl">, if
|
|
any</span>.</p><dl class="domintro"><dt><var title="">legend</var> . <code title="dom-legend-form"><a href="#dom-legend-form">form</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the element's <code><a href="#the-form-element">form</a></code> element, if any, or
|
|
null otherwise.</p>
|
|
|
|
</dd>
|
|
|
|
</dl><div class="impl">
|
|
|
|
<p>The <dfn id="dom-legend-form" title="dom-legend-form"><code>form</code></dfn> IDL
|
|
attribute's behavior depends on whether the <code><a href="#the-legend-element">legend</a></code>
|
|
element is in a <code><a href="#the-fieldset-element">fieldset</a></code> element or not. If the
|
|
<code><a href="#the-legend-element">legend</a></code> has a <code><a href="#the-fieldset-element">fieldset</a></code> element as its
|
|
parent, then the <code title="dom-legend-form"><a href="#dom-legend-form">form</a></code> IDL
|
|
attribute must return the same value as the <code title="dom-fae-form"><a href="association-of-controls-and-forms.html#dom-fae-form">form</a></code> IDL attribute on that
|
|
<code><a href="#the-fieldset-element">fieldset</a></code> element. Otherwise, it must return null.</p>
|
|
|
|
</div><h4 id="the-label-element"><span class="secno">4.10.6 </span>The <dfn><code>label</code></dfn> element</h4><dl class="element"><dt>Categories</dt>
|
|
<dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
|
|
<dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
|
|
<dd><a href="content-models.html#interactive-content">Interactive content</a>.</dd>
|
|
<dd><a href="#form-associated-element">Form-associated element</a>.</dd>
|
|
<dt>Contexts in which this element can be used:</dt>
|
|
<dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
|
|
<dt>Content model:</dt>
|
|
<dd><a href="content-models.html#phrasing-content">Phrasing content</a>, but with no descendant <a href="#category-label" title="category-label">labelable form-associated elements</a> unless it is the element's <a href="#labeled-control">labeled control</a>, and no descendant <code><a href="#the-label-element">label</a></code> elements.</dd>
|
|
<dt>Content attributes:</dt>
|
|
<dd><a href="elements.html#global-attributes">Global attributes</a></dd>
|
|
<dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
|
|
<dd><code title="attr-label-for"><a href="#attr-label-for">for</a></code></dd>
|
|
<dt>DOM interface:</dt>
|
|
<dd>
|
|
<pre class="idl">interface <dfn id="htmllabelelement">HTMLLabelElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
|
|
readonly attribute <a href="#htmlformelement">HTMLFormElement</a> <a href="association-of-controls-and-forms.html#dom-fae-form" title="dom-fae-form">form</a>;
|
|
attribute DOMString <a href="#dom-label-htmlfor" title="dom-label-htmlFor">htmlFor</a>;
|
|
readonly attribute <a href="elements.html#htmlelement">HTMLElement</a> <a href="#dom-label-control" title="dom-label-control">control</a>;
|
|
};</pre>
|
|
</dd>
|
|
</dl><p>The <code><a href="#the-label-element">label</a></code> <a href="rendering.html#represents">represents</a> a caption in a
|
|
user interface. The caption can be associated with a specific form
|
|
control<span class="impl">, known as the <code><a href="#the-label-element">label</a></code>
|
|
element's <dfn id="labeled-control">labeled control</dfn></span>, either using <code title="attr-label-for"><a href="#attr-label-for">for</a></code> attribute, or by putting the form
|
|
control inside the <code><a href="#the-label-element">label</a></code> element itself.</p><div class="impl">
|
|
|
|
<p>Except where otherwise specified by the following rules, a
|
|
<code><a href="#the-label-element">label</a></code> element has no <a href="#labeled-control">labeled control</a>.</p>
|
|
|
|
</div><p>The <dfn id="attr-label-for" title="attr-label-for"><code>for</code></dfn> attribute
|
|
may be specified to indicate a form control with which the caption
|
|
is to be associated. If the attribute is specified, the attribute's
|
|
value must be the <a href="elements.html#concept-id" title="concept-id">ID</a> of a <a href="#category-label" title="category-label">labelable
|
|
form-associated element</a> in the same <code><a href="infrastructure.html#document">Document</a></code> as
|
|
the <code><a href="#the-label-element">label</a></code> element. <span class="impl">If the attribute
|
|
is specified and there is an element in the <code><a href="infrastructure.html#document">Document</a></code>
|
|
whose <a href="elements.html#concept-id" title="concept-id">ID</a> is equal to the value of the <code title="attr-label-for"><a href="#attr-label-for">for</a></code> attribute, and the first such
|
|
element is a <a href="#category-label" title="category-label">labelable form-associated
|
|
element</a>, then that element is the <code><a href="#the-label-element">label</a></code>
|
|
element's <a href="#labeled-control">labeled control</a>.</span></p><div class="impl">
|
|
|
|
<p>If the <code title="attr-label-for"><a href="#attr-label-for">for</a></code> attribute is not
|
|
specified, but the <code><a href="#the-label-element">label</a></code> element has a <a href="#category-label" title="category-label">labelable form-associated element</a>
|
|
descendant, then the first such descendant in <a href="infrastructure.html#tree-order">tree
|
|
order</a> is the <code><a href="#the-label-element">label</a></code> element's <a href="#labeled-control">labeled
|
|
control</a>.</p>
|
|
|
|
<p>The <code><a href="#the-label-element">label</a></code> element's exact default presentation and
|
|
behavior, in particular what its <a href="content-models.html#activation-behavior">activation behavior</a>
|
|
might be, if anything, should match the platform's label
|
|
behavior.</p>
|
|
|
|
|
|
<div class="example">
|
|
|
|
<p>For example, on platforms where clicking a checkbox label checks
|
|
the checkbox, clicking the <code><a href="#the-label-element">label</a></code> in the following
|
|
snippet could trigger the user agent to <a href="content-models.html#run-synthetic-click-activation-steps">run synthetic click
|
|
activation steps</a> on the <code><a href="the-input-element.html#the-input-element">input</a></code> element, as if
|
|
the element itself had been triggered by the user:</p>
|
|
|
|
<pre><label><input type=checkbox name=lost> Lost</label></pre>
|
|
|
|
<p>On other platforms, the behavior might be just to focus the
|
|
control, or do nothing.</p>
|
|
|
|
</div>
|
|
|
|
</div><dl class="domintro"><dt><var title="">label</var> . <code title="dom-label-control"><a href="#dom-label-control">control</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns the form control that is associated with this element.</p>
|
|
|
|
</dd>
|
|
|
|
</dl><p>The <code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code> attribute is used to
|
|
explicitly associate the <code><a href="#the-label-element">label</a></code> element with its
|
|
<a href="association-of-controls-and-forms.html#form-owner">form owner</a>.</p><div class="impl">
|
|
|
|
<p>The <dfn id="dom-label-htmlfor" title="dom-label-htmlFor"><code>htmlFor</code></dfn> IDL
|
|
attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the <code title="attr-label-for"><a href="#attr-label-for">for</a></code> content attribute.</p>
|
|
|
|
<p>The <dfn id="dom-label-control" title="dom-label-control"><code>control</code></dfn> IDL
|
|
attribute must return the <code><a href="#the-label-element">label</a></code> element's <a href="#labeled-control">labeled
|
|
control</a>, if any, or null if there isn't one.</p>
|
|
|
|
</div><hr><dl class="domintro"><dt><var title="">control</var> . <code title="dom-lfe-labels"><a href="#dom-lfe-labels">labels</a></code></dt>
|
|
|
|
<dd>
|
|
|
|
<p>Returns a <code><a href="infrastructure.html#nodelist">NodeList</a></code> of all the <code><a href="#the-label-element">label</a></code>
|
|
elements that the form control is associated with.</p>
|
|
|
|
</dd>
|
|
|
|
</dl><div class="impl">
|
|
|
|
<p><a href="#category-label" title="category-label">Labelable form-associated
|
|
elements</a> have a <code><a href="infrastructure.html#nodelist">NodeList</a></code> object associated with
|
|
them that represents the list of <code><a href="#the-label-element">label</a></code> elements, in
|
|
<a href="infrastructure.html#tree-order">tree order</a>, whose <a href="#labeled-control">labeled control</a> is the
|
|
element in question. The <dfn id="dom-lfe-labels" title="dom-lfe-labels"><code>labels</code></dfn> IDL attribute of
|
|
<a href="#category-label" title="category-label">labelable form-associated
|
|
elements</a>, on getting, must return that <code><a href="infrastructure.html#nodelist">NodeList</a></code>
|
|
object.</p>
|
|
|
|
<p>The <code title="dom-fae-form"><a href="association-of-controls-and-forms.html#dom-fae-form">form</a></code> IDL attribute is part
|
|
of the element's forms API.</p>
|
|
|
|
</div><div class="example">
|
|
|
|
<p>The following example shows three form controls each with a
|
|
label, two of which have small text showing the right format for
|
|
users to use.</p>
|
|
|
|
<pre><p><label>Full name: <input name=fn> <small>Format: First Last</small></label></p>
|
|
<p><label>Age: <input name=age type=number min=0></label></p>
|
|
<p><label>Post code: <input name=pc> <small>Format: AB12 3CD</small></label></p></pre>
|
|
|
|
</div></body></html>
|