Annotation of html5/spec/the-form-element.html, revision 1.171
1.88 mike 1: <!DOCTYPE html>
1.159 sruby 2: <html lang="en-US-x-Hixie"><head><title>4.10.3 The form element — HTML5</title><style type="text/css">
1.1 mike 3: pre { margin-left: 2em; white-space: pre-wrap; }
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34:
35: .bad, .bad *:not(.XXX) { color: gray; border-color: gray; background: transparent; }
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37: .matrix { margin-left: 2em; }
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54: dl.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; }
55: dl.switch { padding-left: 2em; }
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58: dl.triple { padding: 0 0 0 1em; }
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60: dl.triple dt:after { content: ':'; }
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65:
66: h2 { page-break-before: always; }
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70: p > span:not([title=""]):not([class="XXX"]):not([class="impl"]):not([class="note"]),
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72:
73: div.head { margin: 0 0 1em; padding: 1em 0 0 0; }
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75: div.head h1 { margin: 0; }
76: div.head .logo { float: right; margin: 0 1em; }
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87: .brief { margin-top: 1em; margin-bottom: 1em; line-height: 1.1; }
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97:
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151:
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164: ul.domTree .t10 code { color: teal; }
165:
166: body.dfnEnabled dfn { cursor: pointer; }
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168: display: inline;
169: position: absolute;
170: z-index: 10;
171: height: auto;
172: width: auto;
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174: font: small sans-serif, Droid Sans Fallback;
175: background: #DDDDDD;
176: color: black;
177: border: outset 0.2em;
178: }
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185: #configUI { position: absolute; z-index: 20; top: 10em; right: 1em; width: 11em; font-size: small; }
186: #configUI p { margin: 0.5em 0; padding: 0.3em; background: #EEEEEE; color: black; border: inset thin; }
187: #configUI p label { display: block; }
188: #configUI #updateUI, #configUI .loginUI { text-align: center; }
189: #configUI input[type=button] { display: block; margin: auto; }
190:
191: fieldset { margin: 1em; padding: 0.5em 1em; }
192: fieldset > legend + * { margin-top: 0; }
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194: fieldset p { margin: 0.5em 0; }
195:
1.159 sruby 196: </style><link href="http://www.w3.org/StyleSheets/TR/W3C-ED" rel="stylesheet" type="text/css"><style type="text/css">
1.1 mike 197:
198: .applies thead th > * { display: block; }
199: .applies thead code { display: block; }
200: .applies tbody th { whitespace: nowrap; }
201: .applies td { text-align: center; }
202: .applies .yes { background: yellow; }
203:
204: .matrix, .matrix td { border: hidden; text-align: right; }
205: .matrix { margin-left: 2em; }
206:
207: .dice-example { border-collapse: collapse; border-style: hidden solid solid hidden; border-width: thin; margin-left: 3em; }
208: .dice-example caption { width: 30em; font-size: smaller; font-style: italic; padding: 0.75em 0; text-align: left; }
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210:
211: td.eg { border-width: thin; text-align: center; }
212:
213: #table-example-1 { border: solid thin; border-collapse: collapse; margin-left: 3em; }
214: #table-example-1 * { font-family: "Essays1743", serif; line-height: 1.01em; }
215: #table-example-1 caption { padding-bottom: 0.5em; }
216: #table-example-1 thead, #table-example-1 tbody { border: none; }
217: #table-example-1 th, #table-example-1 td { border: solid thin; }
218: #table-example-1 th { font-weight: normal; }
219: #table-example-1 td { border-style: none solid; vertical-align: top; }
220: #table-example-1 th { padding: 0.5em; vertical-align: middle; text-align: center; }
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224: #table-example-1 tbody td:first-child::after { content: leader(". "); }
225: #table-example-1 tbody td { padding-left: 2em; padding-right: 2em; }
226: #table-example-1 tbody td:first-child + td { width: 10em; }
227: #table-example-1 tbody td:first-child + td ~ td { width: 2.5em; }
228: #table-example-1 tbody td:first-child + td + td + td ~ td { width: 1.25em; }
229:
230: .apple-table-examples { border: none; border-collapse: separate; border-spacing: 1.5em 0em; width: 40em; margin-left: 3em; }
231: .apple-table-examples * { font-family: "Times", serif; }
232: .apple-table-examples td, .apple-table-examples th { border: none; white-space: nowrap; padding-top: 0; padding-bottom: 0; }
233: .apple-table-examples tbody th:first-child { border-left: none; width: 100%; }
234: .apple-table-examples thead th:first-child ~ th { font-size: smaller; font-weight: bolder; border-bottom: solid 2px; text-align: center; }
235: .apple-table-examples tbody th::after, .apple-table-examples tfoot th::after { content: leader(". ") }
236: .apple-table-examples tbody th, .apple-table-examples tfoot th { font: inherit; text-align: left; }
237: .apple-table-examples td { text-align: right; vertical-align: top; }
238: .apple-table-examples.e1 tbody tr:last-child td { border-bottom: solid 1px; }
239: .apple-table-examples.e1 tbody + tbody tr:last-child td { border-bottom: double 3px; }
240: .apple-table-examples.e2 th[scope=row] { padding-left: 1em; }
241: .apple-table-examples sup { line-height: 0; }
242:
243: .details-example img { vertical-align: top; }
244:
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252: -moz-column-count: 5;
253: -moz-column-gap: 1em;
254: -webkit-column-width: 6em;
255: -webkit-column-count: 5;
256: -webkit-column-gap: 1em;
257: }
258: #base64-table thead { display: none; }
259: #base64-table * { border: none; }
260: #base64-table tbody td:first-child:after { content: ':'; }
261: #base64-table tbody td:last-child { text-align: right; }
262:
263: #named-character-references-table {
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266: column-width: 30em;
267: column-gap: 1em;
268: -moz-column-width: 30em;
269: -moz-column-gap: 1em;
270: -webkit-column-width: 30em;
271: -webkit-column-gap: 1em;
272: }
273: #named-character-references-table > table > tbody > tr > td:first-child + td,
274: #named-character-references-table > table > tbody > tr > td:last-child { text-align: center; }
275: #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; }
276: #named-character-references-table > table > tbody > tr#entity-CounterClockwiseContourIntegral > td:first-child { font-size: 0.5em; }
277:
278: .glyph.control { color: red; }
279:
280: @font-face {
281: font-family: 'Essays1743';
1.169 sruby 282: src: url('../fonts/Essays1743.ttf');
1.1 mike 283: }
284: @font-face {
285: font-family: 'Essays1743';
286: font-weight: bold;
1.169 sruby 287: src: url('../fonts/Essays1743-Bold.ttf');
1.1 mike 288: }
289: @font-face {
290: font-family: 'Essays1743';
291: font-style: italic;
1.169 sruby 292: src: url('../fonts/Essays1743-Italic.ttf');
1.1 mike 293: }
294: @font-face {
295: font-family: 'Essays1743';
296: font-style: italic;
297: font-weight: bold;
1.169 sruby 298: src: url('../fonts/Essays1743-BoldItalic.ttf');
1.1 mike 299: }
300:
1.159 sruby 301: </style><link href="data:text/css," id="complete" rel="stylesheet" title="Complete specification"><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 requirements"><script>
1.1 mike 302: function getCookie(name) {
303: var params = location.search.substr(1).split("&");
304: for (var index = 0; index < params.length; index++) {
305: if (params[index] == name)
306: return "1";
307: var data = params[index].split("=");
308: if (data[0] == name)
309: return unescape(data[1]);
310: }
311: var cookies = document.cookie.split("; ");
312: for (var index = 0; index < cookies.length; index++) {
313: var data = cookies[index].split("=");
314: if (data[0] == name)
315: return unescape(data[1]);
316: }
317: return null;
318: }
1.159 sruby 319: </script><link href="forms.html" title="4.10 Forms" rel="prev">
1.161 sruby 320: <link href="spec.html#contents" title="Table of contents" rel="contents">
1.1 mike 321: <link href="the-fieldset-element.html" title="4.10.4 The fieldset element" rel="next">
1.22 mike 322: </head><body onload="fixBrokenLink();" class="split chapter"><div class="head" id="head">
1.1 mike 323: <p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
324:
325: <h1>HTML5</h1>
1.159 sruby 326: <h2 class="no-num no-toc" id="a-vocabulary-and-associated-apis-for-html-and-xhtml">A vocabulary and associated APIs for HTML and XHTML</h2>
1.171 ! sruby 327: <h2 class="no-num no-toc" id="editor's-draft-date-1-january-1970">Editor's Draft 10 September 2012</h2>
1.85 mike 328: </div>
1.1 mike 329:
1.159 sruby 330: <div class="prev_next">
1.1 mike 331: <a href="forms.html">← 4.10 Forms</a> –
1.161 sruby 332: <a href="spec.html#contents">Table of contents</a> –
1.1 mike 333: <a href="the-fieldset-element.html">4.10.4 The fieldset element →</a>
1.159 sruby 334: </div>
1.1 mike 335:
1.85 mike 336: <h4 id="the-form-element"><span class="secno">4.10.3 </span>The <dfn><code>form</code></dfn> element</h4>
337:
338: <dl class="element"><dt><a href="element-definitions.html#element-dfn-categories" title="element-dfn-categories">Categories</a>:</dt>
1.159 sruby 339: <dd><a href="content-models.html#flow-content-1">Flow content</a>.</dd>
340: <dd><a href="content-models.html#palpable-content-0">Palpable content</a>.</dd>
1.25 mike 341: <dt><a href="element-definitions.html#element-dfn-contexts" title="element-dfn-contexts">Contexts in which this element can be used</a>:</dt>
1.159 sruby 342: <dd>Where <a href="content-models.html#flow-content-1">flow content</a> is expected.</dd>
1.25 mike 343: <dt><a href="element-definitions.html#element-dfn-content-model" title="element-dfn-content-model">Content model</a>:</dt>
1.159 sruby 344: <dd><a href="content-models.html#flow-content-1">Flow content</a>, but with no <code><a href="#the-form-element">form</a></code> element descendants.</dd>
1.25 mike 345: <dt><a href="element-definitions.html#element-dfn-attributes" title="element-dfn-attributes">Content attributes</a>:</dt>
1.1 mike 346: <dd><a href="global-attributes.html#global-attributes">Global attributes</a></dd>
347: <dd><code title="attr-form-accept-charset"><a href="#attr-form-accept-charset">accept-charset</a></code></dd>
1.159 sruby 348: <dd><code title="attr-fs-action"><a href="form-submission.html#attr-fs-action">action</a></code></dd>
1.1 mike 349: <dd><code title="attr-form-autocomplete"><a href="#attr-form-autocomplete">autocomplete</a></code></dd>
1.159 sruby 350: <dd><code title="attr-fs-enctype"><a href="form-submission.html#attr-fs-enctype">enctype</a></code></dd>
351: <dd><code title="attr-fs-method"><a href="form-submission.html#attr-fs-method">method</a></code></dd>
1.1 mike 352: <dd><code title="attr-form-name"><a href="#attr-form-name">name</a></code></dd>
1.159 sruby 353: <dd><code title="attr-fs-novalidate"><a href="form-submission.html#attr-fs-novalidate">novalidate</a></code></dd>
354: <dd><code title="attr-fs-target"><a href="form-submission.html#attr-fs-target">target</a></code></dd>
355: <dt><a href="element-definitions.html#element-dfn-dom" title="element-dfn-dom">DOM interface</a>:</dt><!--TOPIC:DOM APIs-->
1.1 mike 356: <dd>
357: <pre class="idl">[OverrideBuiltins]
358: interface <dfn id="htmlformelement">HTMLFormElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
359: attribute DOMString <a href="#dom-form-acceptcharset" title="dom-form-acceptCharset">acceptCharset</a>;
1.159 sruby 360: attribute DOMString <a href="form-submission.html#dom-fs-action" title="dom-fs-action">action</a>;
1.1 mike 361: attribute DOMString <a href="#dom-form-autocomplete" title="dom-form-autocomplete">autocomplete</a>;
1.159 sruby 362: attribute DOMString <a href="form-submission.html#dom-fs-enctype" title="dom-fs-enctype">enctype</a>;
363: attribute DOMString <a href="form-submission.html#dom-fs-encoding" title="dom-fs-encoding">encoding</a>;<!-- historical artefact -->
364: attribute DOMString <a href="form-submission.html#dom-fs-method" title="dom-fs-method">method</a>;
1.1 mike 365: attribute DOMString <a href="#dom-form-name" title="dom-form-name">name</a>;
1.159 sruby 366: attribute boolean <a href="form-submission.html#dom-fs-novalidate" title="dom-fs-noValidate">noValidate</a>;
367: attribute DOMString <a href="form-submission.html#dom-fs-target" title="dom-fs-target">target</a>;
1.1 mike 368:
1.159 sruby 369: readonly attribute <a href="common-dom-interfaces.html#htmlformcontrolscollection-0">HTMLFormControlsCollection</a> <a href="#dom-form-elements" title="dom-form-elements">elements</a>;
1.1 mike 370: readonly attribute long <a href="#dom-form-length" title="dom-form-length">length</a>;
371: <a href="#dom-form-item" title="dom-form-item">getter</a> <a href="infrastructure.html#element">Element</a> (unsigned long index);
372: <a href="#dom-form-nameditem" title="dom-form-namedItem">getter</a> object (DOMString name);
373:
374: void <a href="#dom-form-submit" title="dom-form-submit">submit</a>();
375: void <a href="#dom-form-reset" title="dom-form-reset">reset</a>();
376: boolean <a href="#dom-form-checkvalidity" title="dom-form-checkValidity">checkValidity</a>();
377: };</pre>
378: </dd>
1.159 sruby 379: </dl><!--TOPIC:HTML--><p>The <code><a href="#the-form-element">form</a></code> element <a href="rendering.html#represents">represents</a> a
1.1 mike 380: collection of <a href="forms.html#form-associated-element" title="form-associated element">form-associated
381: elements</a>, some of which can represent editable values that
1.85 mike 382: can be submitted to a server for processing.</p>
383:
384: <p>The <dfn id="attr-form-accept-charset" title="attr-form-accept-charset"><code>accept-charset</code></dfn>
1.1 mike 385: attribute gives the character encodings that are to be used for the
386: submission. If specified, the value must be an <a href="common-microsyntaxes.html#ordered-set-of-unique-space-separated-tokens">ordered set of
387: unique space-separated tokens</a> that are <a href="infrastructure.html#ascii-case-insensitive">ASCII
388: case-insensitive</a>, and each token must be an <a href="infrastructure.html#ascii-case-insensitive">ASCII
389: case-insensitive</a> match for the <a href="infrastructure.html#preferred-mime-name">preferred MIME
390: name</a> of an <a href="infrastructure.html#ascii-compatible-character-encoding">ASCII-compatible character encoding</a>.
1.85 mike 391: <a href="references.html#refsIANACHARSET">[IANACHARSET]</a></p>
392:
393: <p>The <dfn id="attr-form-name" title="attr-form-name"><code>name</code></dfn> attribute
1.1 mike 394: 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
395: not be the empty string, and the value must be unique amongst the
396: <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
1.85 mike 397: any.</p>
398:
399: <p>The <dfn id="attr-form-autocomplete" title="attr-form-autocomplete"><code>autocomplete</code></dfn>
1.1 mike 400: attribute is an <a href="common-microsyntaxes.html#enumerated-attribute">enumerated attribute</a>. The attribute has
401: two states. The <code title="attr-form-autocomplete-on">on</code>
402: keyword maps to the <dfn id="attr-form-autocomplete-on-state" title="attr-form-autocomplete-on-state">on</dfn> state, and the
403: <code title="attr-form-autocomplete-off">off</code> keyword maps to
404: the <dfn id="attr-form-autocomplete-off-state" title="attr-form-autocomplete-off-state">off</dfn>
405: state. The attribute may also be omitted. The <i>missing value
406: 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
407: that by default, <code><a href="the-input-element.html#the-input-element">input</a></code> elements in the form will have
408: 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
409: that by default, <code><a href="the-input-element.html#the-input-element">input</a></code> elements in the form will have
1.85 mike 410: their <a href="common-input-element-attributes.html#resulting-autocompletion-state">resulting autocompletion state</a> set to <i title="">on</i>.</p>
411:
1.159 sruby 412: <p>The <code title="attr-fs-action"><a href="form-submission.html#attr-fs-action">action</a></code>, <code title="attr-fs-enctype"><a href="form-submission.html#attr-fs-enctype">enctype</a></code>, <code title="attr-fs-method"><a href="form-submission.html#attr-fs-method">method</a></code>, <code title="attr-fs-novalidate"><a href="form-submission.html#attr-fs-novalidate">novalidate</a></code>, and <code title="attr-fs-target"><a href="form-submission.html#attr-fs-target">target</a></code> attributes are <a href="form-submission.html#attributes-for-form-submission">attributes
1.85 mike 413: for form submission</a>.</p>
414:
1.159 sruby 415: <!--TOPIC:DOM APIs-->
1.85 mike 416: <dl class="domintro"><dt><var title="">form</var> . <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code></dt>
1.1 mike 417:
418: <dd>
419:
420: <p>Returns an <code><a href="infrastructure.html#htmlcollection">HTMLCollection</a></code> of the form controls in
421: the form (excluding image buttons for historical reasons).</p>
422:
423: </dd>
424:
425: <dt><var title="">form</var> . <code title="dom-form-length"><a href="#dom-form-length">length</a></code></dt>
426:
427: <dd>
428:
429: <p>Returns the number of form controls in the form (excluding
430: image buttons for historical reasons).</p>
431:
432: </dd>
433:
434: <dt><var title="">form</var>[<var title="">index</var>]</dt>
435: <dt><var title="">form</var>(<var title="">index</var>)</dt>
436:
437: <dd>
438:
439: <p>Returns the <var title="">index</var>th element in the form
440: (excluding image buttons for historical reasons).</p>
441:
442: </dd>
443:
444: <dt><var title="">form</var>[<var title="">name</var>]</dt>
445: <dt><var title="">form</var>(<var title="">name</var>)</dt>
446:
447: <dd>
448:
449: <p>Returns the form control (or, if there are several, a
1.123 mike 450: <code><a href="common-dom-interfaces.html#radionodelist">RadioNodeList</a></code> of the form controls) in the form with
451: the given <a href="infrastructure.html#concept-id" title="concept-id">ID</a> or <code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code> (excluding image buttons for
1.1 mike 452: historical reasons); or, if there are none, returns the
453: <code><a href="the-img-element.html#the-img-element">img</a></code> element with the given ID.</p>
454:
455: <p>Once an element has been referenced using a particular name,
456: that name will continue being available as a way to reference that
457: element in this method, even if the element's actual <a href="infrastructure.html#concept-id" title="concept-id">ID</a> or <code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code> changes, for as long as the
458: element remains in the <code><a href="dom.html#document">Document</a></code>.</p>
459:
460: <p>If there are multiple matching items, then a
1.123 mike 461: <code><a href="common-dom-interfaces.html#radionodelist">RadioNodeList</a></code> object containing all those elements is
1.1 mike 462: returned.</p>
463:
464: </dd>
465:
466: <dt><var title="">form</var> . <code title="dom-form-submit"><a href="#dom-form-submit">submit</a></code>()</dt>
467:
468: <dd>
469:
470: <p>Submits the form.</p>
471:
472: </dd>
473:
474: <dt><var title="">form</var> . <code title="dom-form-reset"><a href="#dom-form-reset">reset</a></code>()</dt>
475:
476: <dd>
477:
478: <p>Resets the form.</p>
479:
480: </dd>
481:
482: <dt><var title="">form</var> . <code title="dom-form-checkValidity"><a href="#dom-form-checkvalidity">checkValidity</a></code>()</dt>
483:
484: <dd>
485:
486: <p>Returns true if the form's controls are all valid; otherwise,
487: returns false.</p>
488:
489: </dd>
490:
491: </dl><div class="impl">
492:
493: <p>The <dfn id="dom-form-autocomplete" title="dom-form-autocomplete"><code>autocomplete</code></dfn> IDL
494: attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the content attribute of the
495: same name, <a href="common-dom-interfaces.html#limited-to-only-known-values">limited to only known values</a>.</p>
496:
497: <p>The <dfn id="dom-form-name" title="dom-form-name"><code>name</code></dfn> IDL
498: attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the content attribute of the
499: same name.</p>
500:
501: <p>The <dfn id="dom-form-acceptcharset" title="dom-form-acceptCharset"><code>acceptCharset</code></dfn> IDL
502: 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
503: attribute.</p>
504:
505: <hr><p>The <dfn id="dom-form-elements" title="dom-form-elements"><code>elements</code></dfn>
1.159 sruby 506: IDL attribute must return an <code><a href="common-dom-interfaces.html#htmlformcontrolscollection-0">HTMLFormControlsCollection</a></code>
1.124 mike 507: rooted at the <code><a href="dom.html#document">Document</a></code> node while the <code><a href="#the-form-element">form</a></code>
508: element is <a href="infrastructure.html#in-a-document">in a <code>Document</code></a> and rooted at the
509: <code><a href="#the-form-element">form</a></code> element itself when it is not, whose filter
510: matches <a href="forms.html#category-listed" title="category-listed">listed elements</a> whose
511: <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
1.159 sruby 512: 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="states-of-the-type-attribute.html#image-button-state-(type=image)" title="attr-input-type-image">Image Button</a> state, which must,
1.1 mike 513: for historical reasons, be excluded from this particular
514: collection.</p>
515:
516: <p>The <dfn id="dom-form-length" title="dom-form-length"><code>length</code></dfn> IDL
517: attribute must return the number of nodes <a href="infrastructure.html#represented-by-the-collection" title="represented
518: by the collection">represented</a> by the <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code> collection.</p>
519:
520: <p>The <a href="infrastructure.html#supported-property-indices">supported property indices</a> at any instant are
521: 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
522: instant.</p>
523:
524: <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>,
525: the user agent must return the value returned by the <code title="dom-HTMLFormControlsCollection-item">item</code> method on
526: the <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code> collection, when
527: invoked with the given index as its argument.</p>
528:
1.159 sruby 529: <hr><!-- Welcome to crazy town. Population: The Web. --><p>Each <code><a href="#the-form-element">form</a></code> element has a mapping of names to elements
1.1 mike 530: called the <dfn id="past-names-map">past names map</dfn>. It is used to persist names of
531: controls even when they change names.</p>
532:
533: <p>The <a href="infrastructure.html#supported-property-names">supported property names</a> consist of the values
534: of all the <code title="attr-id"><a href="global-attributes.html#the-id-attribute">id</a></code> and <code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code> attributes of all the <a href="forms.html#category-listed" title="category-listed">listed elements</a> and <code><a href="the-img-element.html#the-img-element">img</a></code>
535: elements that are descendants of the <code><a href="#the-form-element">form</a></code> element, and
536: all the names currently in the <a href="#past-names-map">past names map</a>.</p>
537:
538: <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
539: retrieval</dfn>, the user agent must run the following steps:</p>
540:
541: <ol><li><p>Let <var title="">candidates</var> be a <a href="infrastructure.html#live">live</a>
1.123 mike 542: <code><a href="common-dom-interfaces.html#radionodelist">RadioNodeList</a></code> object containing all the <a href="forms.html#category-listed" title="category-listed">listed elements</a> that are descendants
1.1 mike 543: of the <code><a href="#the-form-element">form</a></code> element and that have either an <code title="attr-id"><a href="global-attributes.html#the-id-attribute">id</a></code> attribute or a <code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code> attribute equal to <var title="">name</var>, in <a href="infrastructure.html#tree-order">tree order</a>.</p></li>
544:
545: <li><p>If <var title="">candidates</var> is empty, let <var title="">candidates</var> be a <a href="infrastructure.html#live">live</a>
1.123 mike 546: <code><a href="common-dom-interfaces.html#radionodelist">RadioNodeList</a></code> object containing all the
547: <code><a href="the-img-element.html#the-img-element">img</a></code> elements that are descendants of the
548: <code><a href="#the-form-element">form</a></code> element and that have either an <code title="attr-id"><a href="global-attributes.html#the-id-attribute">id</a></code> attribute or a <code title="attr-img-name"><a href="obsolete.html#attr-img-name">name</a></code> attribute equal to <var title="">name</var>, in <a href="infrastructure.html#tree-order">tree order</a>.</p></li>
1.1 mike 549:
550: <li><p>If <var title="">candidates</var> is empty, <var title="">name</var> is the name of one of the entries in the
551: <code><a href="#the-form-element">form</a></code> element's <a href="#past-names-map">past names map</a>: return the
552: object associated with <var title="">name</var> in that
553: map.</p></li>
554:
555: <li><p>If <var title="">candidates</var> contains more than one
556: node, return <var title="">candidates</var> and abort these
557: steps.</p></li>
558:
559: <li><p>Otherwise, <var title="">candidates</var> contains exactly
560: one node. Add a mapping from <var title="">name</var> to the node
561: in <var title="">candidates</var> in the <code><a href="#the-form-element">form</a></code> element's
562: <a href="#past-names-map">past names map</a>, replacing the previous entry with the
563: same name, if any.</p></li>
564:
565: <li><p>Return the node in <var title="">candidates</var>.</p></li>
566:
567: </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
568: names map</a> is removed from the <code><a href="dom.html#document">Document</a></code>, then its
569: entries must be removed from the map.</p>
570:
1.159 sruby 571: <!--
572: This ridiculous setup is intended to do as much of the right thing
573: while still supporting code written to work in IE7. IE versions
574: prior to IE8 do not update the names on the <form> element
575: collection to match new names when elements are renamed, and there
576: are enough pages that rename elements and then access them by
577: their old name that we have to support this.
578:
579: But we still want to expose them using the new names, so as far as
580: possible we pretend the legacy names aren't there except if
581: there's no other element actually named that way.
582:
583: Removing the element did remove the legacy name in IE7:
584: http://software.hixie.ch/utilities/js/live-dom-viewer/?%3C!DOCTYPE%20html%3E...%3Cform%20action%3D%22%2F%22%3E%3Cinput%20name%3Dsubmit%3E%3C%2Fform%3E%0A%3Cscript%3E%0A%20w(document.forms%5B0%5D.submit)%3B%0A%20w(document.forms%5B0%5D.removeChild(document.getElementsByTagName('input')%5B0%5D))%3B%0A%20w(document.forms%5B0%5D.length)%3B%0A%20try%20%7B%20document.forms%5B0%5D.submit()%3B%20%7D%20catch%20(e)%20%20%7B%20w(e.message)%20%7D%0A%3C%2Fscript%3E
585:
586: There's no interop on what happens when the name was originally a
587: duplicate name, so we don't persist such accesses - at the time
588: of writing, Safari returned the first element, Firefox returned
589: null (as we do), and IE7 returned the original collection:
590: http://software.hixie.ch/utilities/js/live-dom-viewer/?%3C!DOCTYPE%20html%3E...%3Cform%20action%3D%22%2F%22%3E%3Cinput%20name%3Da%20id%3Dfirst%3E%3Cinput%20name%3Da%20id%3Dsecond%3E%3C%2Fform%3E%0A%3Cscript%3E%0A%20w%28document.forms[0].a%29%3B%0A%20document.getElementsByTagName%28%27input%27%29[0].name%20%3D%20%27b%27%3B%0A%20document.getElementsByTagName%28%27input%27%29[1].name%20%3D%20%27b%27%3B%0A%20w%28document.forms[0].length%29%3B%0A%20w%28document.forms[0].a.id%29%3B%0A%3C%2Fscript%3E
591:
592: In addition, the <img> fallback nonsense is similarly here for
593: legacy reasons. As is the exclusion of <input type=image>.
1.4 mike 594:
1.159 sruby 595: Also, check this out:
596: http://software.hixie.ch/utilities/js/live-dom-viewer/saved/1220
597:
598: -->
599:
600: <!-- Now leaving crazy town. -->
1.1 mike 601:
602: <hr><p>The <dfn id="dom-form-submit" title="dom-form-submit"><code>submit()</code></dfn>
1.159 sruby 603: method, when invoked, must <a href="constraints.html#concept-form-submit" title="concept-form-submit">submit</a> the <code><a href="#the-form-element">form</a></code>
1.1 mike 604: element from the <code><a href="#the-form-element">form</a></code> element itself, with the <var title="">submitted from <code title="dom-form-submit"><a href="#dom-form-submit">submit()</a></code> method</var> flag set.</p>
605:
606: <p>The <dfn id="dom-form-reset" title="dom-form-reset"><code>reset()</code></dfn>
607: method, when invoked, must run the following steps:</p>
608:
609: <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
610: reset</a></i>, then abort these steps.</p></li>
611:
612: <li><p>Mark the <code><a href="#the-form-element">form</a></code> element as <dfn id="locked-for-reset">locked for
613: reset</dfn>.</p></li>
614:
1.159 sruby 615: <li><p><a href="constraints.html#concept-form-reset" title="concept-form-reset">Reset</a> the
1.1 mike 616: <code><a href="#the-form-element">form</a></code> element.</p></li>
617:
618: <li><p>Unmark the <code><a href="#the-form-element">form</a></code> element as <i><a href="#locked-for-reset">locked for
619: reset</a></i>.</p></li>
620:
621: </ol><p>If the <dfn id="dom-form-checkvalidity" title="dom-form-checkValidity"><code>checkValidity()</code></dfn>
622: method is invoked, the user agent must <a href="constraints.html#statically-validate-the-constraints">statically validate the
623: constraints</a> of the <code><a href="#the-form-element">form</a></code> element, and return true
624: if the constraint validation return a <i>positive</i> result, and
625: false if it returned a <i>negative</i> result.</p>
626:
1.85 mike 627: </div>
1.159 sruby 628: <!--TOPIC:HTML-->
1.85 mike 629:
630: <div class="example">
1.1 mike 631:
632: <p>This example shows two search forms:</p>
633:
634: <pre><form action="http://www.google.com/search" method="get">
635: <label>Google: <input type="search" name="q"></label> <input type="submit" value="Search...">
636: </form>
637: <form action="http://www.bing.com/search" method="get">
638: <label>Bing: <input type="search" name="q"></label> <input type="submit" value="Search...">
639: </form></pre>
640:
1.85 mike 641: </div>
642:
643:
644:
645:
646: </body></html>
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