Annotation of html5/spec/the-form-element.html, revision 1.128
1.88 mike 1: <!DOCTYPE html>
1.96 mike 2: <html lang="en-US-x-Hixie"><head><title>4.10.3 The form element — HTML5</title><link rel="stylesheet" href="alert.css"><style type="text/css">
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1.114 mike 196: </style><link href="http://www.w3.org/StyleSheets/TR/W3C-ED" rel="stylesheet" type="text/css"><meta content="noindex" name="robots"><style type="text/css">
1.1 mike 197:
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300:
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 type="text/javascript">
302: function getCookie(name) {
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315: return unescape(data[1]);
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318: }
1.96 mike 319: </script>
1.1 mike 320: <script src="link-fixup.js"></script>
321: <link href="forms.html" title="4.10 Forms" rel="prev">
322: <link href="index.html#contents" title="Table of contents" rel="contents">
323: <link href="the-fieldset-element.html" title="4.10.4 The fieldset element" rel="next">
1.22 mike 324: </head><body onload="fixBrokenLink();" class="split chapter"><div class="head" id="head">
1.1 mike 325: <p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
326:
327: <h1>HTML5</h1>
1.128 ! mike 328: <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><p>This is revision 1.5658.</p>
1.85 mike 329:
1.125 mike 330: <h2 class="no-num no-toc" id="editor-s-draft-8-may-2012">Editor's Draft 8 May 2012</h2>
1.85 mike 331: </div>
1.1 mike 332:
1.85 mike 333: <nav class="prev_next">
1.1 mike 334: <a href="forms.html">← 4.10 Forms</a> –
335: <a href="index.html#contents">Table of contents</a> –
336: <a href="the-fieldset-element.html">4.10.4 The fieldset element →</a>
337: </nav>
338:
1.85 mike 339: <h4 id="the-form-element"><span class="secno">4.10.3 </span>The <dfn><code>form</code></dfn> element</h4>
340:
341: <dl class="element"><dt><a href="element-definitions.html#element-dfn-categories" title="element-dfn-categories">Categories</a>:</dt>
1.1 mike 342: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
343: <dd><a href="content-models.html#palpable-content">Palpable content</a>.</dd>
1.25 mike 344: <dt><a href="element-definitions.html#element-dfn-contexts" title="element-dfn-contexts">Contexts in which this element can be used</a>:</dt>
1.1 mike 345: <dd>Where <a href="content-models.html#flow-content">flow content</a> is expected.</dd>
1.25 mike 346: <dt><a href="element-definitions.html#element-dfn-content-model" title="element-dfn-content-model">Content model</a>:</dt>
1.1 mike 347: <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>
1.25 mike 348: <dt><a href="element-definitions.html#element-dfn-attributes" title="element-dfn-attributes">Content attributes</a>:</dt>
1.1 mike 349: <dd><a href="global-attributes.html#global-attributes">Global attributes</a></dd>
350: <dd><code title="attr-form-accept-charset"><a href="#attr-form-accept-charset">accept-charset</a></code></dd>
351: <dd><code title="attr-fs-action"><a href="attributes-common-to-form-controls.html#attr-fs-action">action</a></code></dd>
352: <dd><code title="attr-form-autocomplete"><a href="#attr-form-autocomplete">autocomplete</a></code></dd>
353: <dd><code title="attr-fs-enctype"><a href="attributes-common-to-form-controls.html#attr-fs-enctype">enctype</a></code></dd>
354: <dd><code title="attr-fs-method"><a href="attributes-common-to-form-controls.html#attr-fs-method">method</a></code></dd>
355: <dd><code title="attr-form-name"><a href="#attr-form-name">name</a></code></dd>
356: <dd><code title="attr-fs-novalidate"><a href="attributes-common-to-form-controls.html#attr-fs-novalidate">novalidate</a></code></dd>
357: <dd><code title="attr-fs-target"><a href="attributes-common-to-form-controls.html#attr-fs-target">target</a></code></dd>
1.25 mike 358: <dt><a href="element-definitions.html#element-dfn-dom" title="element-dfn-dom">DOM interface</a>:</dt>
1.1 mike 359: <dd>
360: <pre class="idl">[OverrideBuiltins]
361: interface <dfn id="htmlformelement">HTMLFormElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
362: attribute DOMString <a href="#dom-form-acceptcharset" title="dom-form-acceptCharset">acceptCharset</a>;
363: attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fs-action" title="dom-fs-action">action</a>;
364: attribute DOMString <a href="#dom-form-autocomplete" title="dom-form-autocomplete">autocomplete</a>;
365: attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fs-enctype" title="dom-fs-enctype">enctype</a>;
366: attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fs-encoding" title="dom-fs-encoding">encoding</a>;
367: attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fs-method" title="dom-fs-method">method</a>;
368: attribute DOMString <a href="#dom-form-name" title="dom-form-name">name</a>;
369: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fs-novalidate" title="dom-fs-noValidate">noValidate</a>;
370: attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fs-target" title="dom-fs-target">target</a>;
371:
372: readonly attribute <a href="common-dom-interfaces.html#htmlformcontrolscollection">HTMLFormControlsCollection</a> <a href="#dom-form-elements" title="dom-form-elements">elements</a>;
373: readonly attribute long <a href="#dom-form-length" title="dom-form-length">length</a>;
374: <a href="#dom-form-item" title="dom-form-item">getter</a> <a href="infrastructure.html#element">Element</a> (unsigned long index);
375: <a href="#dom-form-nameditem" title="dom-form-namedItem">getter</a> object (DOMString name);
376:
377: void <a href="#dom-form-submit" title="dom-form-submit">submit</a>();
378: void <a href="#dom-form-reset" title="dom-form-reset">reset</a>();
379: boolean <a href="#dom-form-checkvalidity" title="dom-form-checkValidity">checkValidity</a>();
380: };</pre>
381: </dd>
382: </dl><p>The <code><a href="#the-form-element">form</a></code> element <a href="rendering.html#represents">represents</a> a
383: collection of <a href="forms.html#form-associated-element" title="form-associated element">form-associated
384: elements</a>, some of which can represent editable values that
1.85 mike 385: can be submitted to a server for processing.</p>
386:
387: <p>The <dfn id="attr-form-accept-charset" title="attr-form-accept-charset"><code>accept-charset</code></dfn>
1.1 mike 388: attribute gives the character encodings that are to be used for the
389: submission. If specified, the value must be an <a href="common-microsyntaxes.html#ordered-set-of-unique-space-separated-tokens">ordered set of
390: unique space-separated tokens</a> that are <a href="infrastructure.html#ascii-case-insensitive">ASCII
391: case-insensitive</a>, and each token must be an <a href="infrastructure.html#ascii-case-insensitive">ASCII
392: case-insensitive</a> match for the <a href="infrastructure.html#preferred-mime-name">preferred MIME
393: name</a> of an <a href="infrastructure.html#ascii-compatible-character-encoding">ASCII-compatible character encoding</a>.
1.85 mike 394: <a href="references.html#refsIANACHARSET">[IANACHARSET]</a></p>
395:
396: <p>The <dfn id="attr-form-name" title="attr-form-name"><code>name</code></dfn> attribute
1.1 mike 397: 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
398: not be the empty string, and the value must be unique amongst the
399: <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 400: any.</p>
401:
402: <p>The <dfn id="attr-form-autocomplete" title="attr-form-autocomplete"><code>autocomplete</code></dfn>
1.1 mike 403: attribute is an <a href="common-microsyntaxes.html#enumerated-attribute">enumerated attribute</a>. The attribute has
404: two states. The <code title="attr-form-autocomplete-on">on</code>
405: keyword maps to the <dfn id="attr-form-autocomplete-on-state" title="attr-form-autocomplete-on-state">on</dfn> state, and the
406: <code title="attr-form-autocomplete-off">off</code> keyword maps to
407: the <dfn id="attr-form-autocomplete-off-state" title="attr-form-autocomplete-off-state">off</dfn>
408: state. The attribute may also be omitted. The <i>missing value
409: 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
410: that by default, <code><a href="the-input-element.html#the-input-element">input</a></code> elements in the form will have
411: 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
412: 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 413: their <a href="common-input-element-attributes.html#resulting-autocompletion-state">resulting autocompletion state</a> set to <i title="">on</i>.</p>
414:
415: <p>The <code title="attr-fs-action"><a href="attributes-common-to-form-controls.html#attr-fs-action">action</a></code>, <code title="attr-fs-enctype"><a href="attributes-common-to-form-controls.html#attr-fs-enctype">enctype</a></code>, <code title="attr-fs-method"><a href="attributes-common-to-form-controls.html#attr-fs-method">method</a></code>, <code title="attr-fs-novalidate"><a href="attributes-common-to-form-controls.html#attr-fs-novalidate">novalidate</a></code>, and <code title="attr-fs-target"><a href="attributes-common-to-form-controls.html#attr-fs-target">target</a></code> attributes are <a href="attributes-common-to-form-controls.html#attributes-for-form-submission">attributes
416: for form submission</a>.</p>
417:
418:
419: <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 420:
421: <dd>
422:
423: <p>Returns an <code><a href="infrastructure.html#htmlcollection">HTMLCollection</a></code> of the form controls in
424: the form (excluding image buttons for historical reasons).</p>
425:
426: </dd>
427:
428: <dt><var title="">form</var> . <code title="dom-form-length"><a href="#dom-form-length">length</a></code></dt>
429:
430: <dd>
431:
432: <p>Returns the number of form controls in the form (excluding
433: image buttons for historical reasons).</p>
434:
435: </dd>
436:
437: <dt><var title="">form</var>[<var title="">index</var>]</dt>
438: <dt><var title="">form</var>(<var title="">index</var>)</dt>
439:
440: <dd>
441:
442: <p>Returns the <var title="">index</var>th element in the form
443: (excluding image buttons for historical reasons).</p>
444:
445: </dd>
446:
447: <dt><var title="">form</var>[<var title="">name</var>]</dt>
448: <dt><var title="">form</var>(<var title="">name</var>)</dt>
449:
450: <dd>
451:
452: <p>Returns the form control (or, if there are several, a
1.123 mike 453: <code><a href="common-dom-interfaces.html#radionodelist">RadioNodeList</a></code> of the form controls) in the form with
454: 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 455: historical reasons); or, if there are none, returns the
456: <code><a href="the-img-element.html#the-img-element">img</a></code> element with the given ID.</p>
457:
458: <p>Once an element has been referenced using a particular name,
459: that name will continue being available as a way to reference that
460: 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
461: element remains in the <code><a href="dom.html#document">Document</a></code>.</p>
462:
463: <p>If there are multiple matching items, then a
1.123 mike 464: <code><a href="common-dom-interfaces.html#radionodelist">RadioNodeList</a></code> object containing all those elements is
1.1 mike 465: returned.</p>
466:
467: </dd>
468:
469: <dt><var title="">form</var> . <code title="dom-form-submit"><a href="#dom-form-submit">submit</a></code>()</dt>
470:
471: <dd>
472:
473: <p>Submits the form.</p>
474:
475: </dd>
476:
477: <dt><var title="">form</var> . <code title="dom-form-reset"><a href="#dom-form-reset">reset</a></code>()</dt>
478:
479: <dd>
480:
481: <p>Resets the form.</p>
482:
483: </dd>
484:
485: <dt><var title="">form</var> . <code title="dom-form-checkValidity"><a href="#dom-form-checkvalidity">checkValidity</a></code>()</dt>
486:
487: <dd>
488:
489: <p>Returns true if the form's controls are all valid; otherwise,
490: returns false.</p>
491:
492: </dd>
493:
494: </dl><div class="impl">
495:
496: <p>The <dfn id="dom-form-autocomplete" title="dom-form-autocomplete"><code>autocomplete</code></dfn> IDL
497: attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the content attribute of the
498: same name, <a href="common-dom-interfaces.html#limited-to-only-known-values">limited to only known values</a>.</p>
499:
500: <p>The <dfn id="dom-form-name" title="dom-form-name"><code>name</code></dfn> IDL
501: attribute must <a href="common-dom-interfaces.html#reflect">reflect</a> the content attribute of the
502: same name.</p>
503:
504: <p>The <dfn id="dom-form-acceptcharset" title="dom-form-acceptCharset"><code>acceptCharset</code></dfn> IDL
505: 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
506: attribute.</p>
507:
508: <hr><p>The <dfn id="dom-form-elements" title="dom-form-elements"><code>elements</code></dfn>
509: IDL attribute must return an <code><a href="common-dom-interfaces.html#htmlformcontrolscollection">HTMLFormControlsCollection</a></code>
1.124 mike 510: rooted at the <code><a href="dom.html#document">Document</a></code> node while the <code><a href="#the-form-element">form</a></code>
511: element is <a href="infrastructure.html#in-a-document">in a <code>Document</code></a> and rooted at the
512: <code><a href="#the-form-element">form</a></code> element itself when it is not, whose filter
513: matches <a href="forms.html#category-listed" title="category-listed">listed elements</a> whose
514: <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
515: 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 516: for historical reasons, be excluded from this particular
517: collection.</p>
518:
519: <p>The <dfn id="dom-form-length" title="dom-form-length"><code>length</code></dfn> IDL
520: attribute must return the number of nodes <a href="infrastructure.html#represented-by-the-collection" title="represented
521: by the collection">represented</a> by the <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code> collection.</p>
522:
523: <p>The <a href="infrastructure.html#supported-property-indices">supported property indices</a> at any instant are
524: 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
525: instant.</p>
526:
527: <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>,
528: the user agent must return the value returned by the <code title="dom-HTMLFormControlsCollection-item">item</code> method on
529: the <code title="dom-form-elements"><a href="#dom-form-elements">elements</a></code> collection, when
530: invoked with the given index as its argument.</p>
531:
532: <hr><p>Each <code><a href="#the-form-element">form</a></code> element has a mapping of names to elements
533: called the <dfn id="past-names-map">past names map</dfn>. It is used to persist names of
534: controls even when they change names.</p>
535:
536: <p>The <a href="infrastructure.html#supported-property-names">supported property names</a> consist of the values
537: 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>
538: elements that are descendants of the <code><a href="#the-form-element">form</a></code> element, and
539: all the names currently in the <a href="#past-names-map">past names map</a>.</p>
540:
541: <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
542: retrieval</dfn>, the user agent must run the following steps:</p>
543:
544: <ol><li><p>Let <var title="">candidates</var> be a <a href="infrastructure.html#live">live</a>
1.123 mike 545: <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 546: 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>
547:
548: <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 549: <code><a href="common-dom-interfaces.html#radionodelist">RadioNodeList</a></code> object containing all the
550: <code><a href="the-img-element.html#the-img-element">img</a></code> elements that are descendants of the
551: <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 552:
553: <li><p>If <var title="">candidates</var> is empty, <var title="">name</var> is the name of one of the entries in the
554: <code><a href="#the-form-element">form</a></code> element's <a href="#past-names-map">past names map</a>: return the
555: object associated with <var title="">name</var> in that
556: map.</p></li>
557:
558: <li><p>If <var title="">candidates</var> contains more than one
559: node, return <var title="">candidates</var> and abort these
560: steps.</p></li>
561:
562: <li><p>Otherwise, <var title="">candidates</var> contains exactly
563: one node. Add a mapping from <var title="">name</var> to the node
564: in <var title="">candidates</var> in the <code><a href="#the-form-element">form</a></code> element's
565: <a href="#past-names-map">past names map</a>, replacing the previous entry with the
566: same name, if any.</p></li>
567:
568: <li><p>Return the node in <var title="">candidates</var>.</p></li>
569:
570: </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
571: names map</a> is removed from the <code><a href="dom.html#document">Document</a></code>, then its
572: entries must be removed from the map.</p>
573:
574:
1.4 mike 575:
1.1 mike 576:
577:
578: <hr><p>The <dfn id="dom-form-submit" title="dom-form-submit"><code>submit()</code></dfn>
579: method, when invoked, must <a href="form-submission.html#concept-form-submit" title="concept-form-submit">submit</a> the <code><a href="#the-form-element">form</a></code>
580: 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>
581:
582: <p>The <dfn id="dom-form-reset" title="dom-form-reset"><code>reset()</code></dfn>
583: method, when invoked, must run the following steps:</p>
584:
585: <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
586: reset</a></i>, then abort these steps.</p></li>
587:
588: <li><p>Mark the <code><a href="#the-form-element">form</a></code> element as <dfn id="locked-for-reset">locked for
589: reset</dfn>.</p></li>
590:
591: <li><p><a href="form-submission.html#concept-form-reset" title="concept-form-reset">Reset</a> the
592: <code><a href="#the-form-element">form</a></code> element.</p></li>
593:
594: <li><p>Unmark the <code><a href="#the-form-element">form</a></code> element as <i><a href="#locked-for-reset">locked for
595: reset</a></i>.</p></li>
596:
597: </ol><p>If the <dfn id="dom-form-checkvalidity" title="dom-form-checkValidity"><code>checkValidity()</code></dfn>
598: method is invoked, the user agent must <a href="constraints.html#statically-validate-the-constraints">statically validate the
599: constraints</a> of the <code><a href="#the-form-element">form</a></code> element, and return true
600: if the constraint validation return a <i>positive</i> result, and
601: false if it returned a <i>negative</i> result.</p>
602:
1.85 mike 603: </div>
604:
605:
606: <div class="example">
1.1 mike 607:
608: <p>This example shows two search forms:</p>
609:
610: <pre><form action="http://www.google.com/search" method="get">
611: <label>Google: <input type="search" name="q"></label> <input type="submit" value="Search...">
612: </form>
613: <form action="http://www.bing.com/search" method="get">
614: <label>Bing: <input type="search" name="q"></label> <input type="submit" value="Search...">
615: </form></pre>
616:
1.85 mike 617: </div>
618:
619:
620:
621:
622: </body></html>
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