Annotation of html5/spec/the-select-element.html, revision 1.93
1.88 mike 1: <!DOCTYPE html>
1.93 ! mike 2: <html lang="en-US-x-Hixie"><head><title>4.10.9 The select element — HTML5</title><style type="text/css">
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1.85 mike 196: .stability {
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1.1 mike 233:
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336:
337: </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">
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1.91 mike 355: </script><script src="load-timeout.js"></script>
1.1 mike 356: <script src="link-fixup.js"></script>
357: <link href="the-button-element.html" title="4.10.8 The button element" rel="prev">
358: <link href="index.html#contents" title="Table of contents" rel="contents">
359: <link href="the-datalist-element.html" title="4.10.10 The datalist element" rel="next">
1.22 mike 360: </head><body onload="fixBrokenLink();" class="split chapter"><div class="head" id="head">
1.1 mike 361: <p><a href="http://www.w3.org/"><img alt="W3C" height="48" src="http://www.w3.org/Icons/w3c_home" width="72"></a></p>
362:
363: <h1>HTML5</h1>
1.90 mike 364: <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 1.5610.</p>
1.1 mike 365:
1.90 mike 366: <h2 class="no-num no-toc" id="w3c-working-draft-20-april-2012">W3C Working Draft 20 April 2012</h2>
1.85 mike 367: </div>
368:
369: <nav class="prev_next">
1.1 mike 370: <a href="the-button-element.html">← 4.10.8 The button element</a> –
371: <a href="index.html#contents">Table of contents</a> –
372: <a href="the-datalist-element.html">4.10.10 The datalist element →</a>
373: </nav>
374:
1.85 mike 375: <h4 id="the-select-element"><span class="secno">4.10.9 </span>The <dfn><code>select</code></dfn> element</h4>
376:
377: <dl class="element"><dt><a href="element-definitions.html#element-dfn-categories" title="element-dfn-categories">Categories</a>:</dt>
1.1 mike 378: <dd><a href="content-models.html#flow-content">Flow content</a>.</dd>
379: <dd><a href="content-models.html#phrasing-content">Phrasing content</a>.</dd>
380: <dd><a href="content-models.html#interactive-content">Interactive content</a>.</dd>
381: <dd><a href="forms.html#category-listed" title="category-listed">Listed</a>, <a href="forms.html#category-label" title="category-label">labelable</a>, <a href="forms.html#category-submit" title="category-submit">submittable</a>, and <a href="forms.html#category-reset" title="category-reset">resettable</a> <a href="forms.html#form-associated-element">form-associated element</a>.</dd>
382: <dd><a href="content-models.html#palpable-content">Palpable content</a>.</dd>
1.25 mike 383: <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 384: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
1.25 mike 385: <dt><a href="element-definitions.html#element-dfn-content-model" title="element-dfn-content-model">Content model</a>:</dt>
1.1 mike 386: <dd>Zero or more <code><a href="the-option-element.html#the-option-element">option</a></code> or <code><a href="the-optgroup-element.html#the-optgroup-element">optgroup</a></code> elements.</dd>
1.25 mike 387: <dt><a href="element-definitions.html#element-dfn-attributes" title="element-dfn-attributes">Content attributes</a>:</dt>
1.1 mike 388: <dd><a href="global-attributes.html#global-attributes">Global attributes</a></dd>
389: <dd><code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code></dd>
390: <dd><code title="attr-fe-disabled"><a href="attributes-common-to-form-controls.html#attr-fe-disabled">disabled</a></code></dd>
391: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
392: <dd><code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code></dd>
393: <dd><code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code></dd>
394: <dd><code title="attr-select-required"><a href="#attr-select-required">required</a></code></dd>
395: <dd><code title="attr-select-size"><a href="#attr-select-size">size</a></code></dd>
1.25 mike 396: <dt><a href="element-definitions.html#element-dfn-dom" title="element-dfn-dom">DOM interface</a>:</dt>
1.1 mike 397: <dd>
398: <pre class="idl">interface <dfn id="htmlselectelement">HTMLSelectElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
399: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-autofocus" title="dom-fe-autofocus">autofocus</a>;
400: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-disabled" title="dom-fe-disabled">disabled</a>;
401: readonly attribute <a href="the-form-element.html#htmlformelement">HTMLFormElement</a>? <a href="association-of-controls-and-forms.html#dom-fae-form" title="dom-fae-form">form</a>;
402: attribute boolean <a href="#dom-select-multiple" title="dom-select-multiple">multiple</a>;
403: attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fe-name" title="dom-fe-name">name</a>;
404: attribute boolean <a href="#dom-select-required" title="dom-select-required">required</a>;
405: attribute unsigned long <a href="#dom-select-size" title="dom-select-size">size</a>;
406:
407: readonly attribute DOMString <a href="#dom-select-type" title="dom-select-type">type</a>;
408:
409: readonly attribute <a href="common-dom-interfaces.html#htmloptionscollection">HTMLOptionsCollection</a> <a href="#dom-select-options" title="dom-select-options">options</a>;
410: attribute unsigned long <a href="#dom-select-length" title="dom-select-length">length</a>;
411: getter <a href="infrastructure.html#element">Element</a> <a href="#dom-select-item" title="dom-select-item">item</a>(unsigned long index);
412: object <a href="#dom-select-nameditem" title="dom-select-namedItem">namedItem</a>(DOMString name);
1.74 mike 413: void <a href="#dom-select-add" title="dom-select-add">add</a>((<a href="the-option-element.html#htmloptionelement">HTMLOptionElement</a> or <a href="the-optgroup-element.html#htmloptgroupelement">HTMLOptGroupElement</a>) element, optional (<a href="elements.html#htmlelement">HTMLElement</a> or long)? before = null);
1.1 mike 414: void <a href="#dom-select-remove" title="dom-select-remove">remove</a>(long index);
415: <a href="common-dom-interfaces.html#dom-htmloptionscollection-setter" title="dom-HTMLOptionsCollection-setter">setter creator</a> void (unsigned long index, <a href="the-option-element.html#htmloptionelement">HTMLOptionElement</a> option);
416:
417: readonly attribute <a href="infrastructure.html#htmlcollection">HTMLCollection</a> <a href="#dom-select-selectedoptions" title="dom-select-selectedOptions">selectedOptions</a>;
418: attribute long <a href="#dom-select-selectedindex" title="dom-select-selectedIndex">selectedIndex</a>;
419: attribute DOMString <a href="#dom-select-value" title="dom-select-value">value</a>;
420:
421: readonly attribute boolean <a href="constraints.html#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
422: readonly attribute <a href="constraints.html#validitystate">ValidityState</a> <a href="constraints.html#dom-cva-validity" title="dom-cva-validity">validity</a>;
423: readonly attribute DOMString <a href="constraints.html#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
424: boolean <a href="constraints.html#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
425: void <a href="constraints.html#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(DOMString error);
426:
427: readonly attribute <a href="infrastructure.html#nodelist">NodeList</a> <a href="the-label-element.html#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
428: };</pre>
429: </dd>
430: </dl><p>The <code><a href="#the-select-element">select</a></code> element represents a control for
1.85 mike 431: selecting amongst a set of options.</p>
432:
433: <p>The <dfn id="attr-select-multiple" title="attr-select-multiple"><code>multiple</code></dfn>
1.1 mike 434: attribute is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. If the attribute is
435: present, then the <code><a href="#the-select-element">select</a></code> element
436: <a href="rendering.html#represents">represents</a> a control for selecting zero or more options
437: from the <a href="#concept-select-option-list" title="concept-select-option-list">list of
438: options</a>. If the attribute is absent, then the
439: <code><a href="#the-select-element">select</a></code> element <a href="rendering.html#represents">represents</a> a control for
1.85 mike 440: selecting a single option from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
441:
442: <p>The <dfn id="attr-select-size" title="attr-select-size"><code>size</code></dfn>
1.1 mike 443: attribute gives the number of options to show to the user. The <code title="attr-select-size"><a href="#attr-select-size">size</a></code> attribute, if specified, must
444: have a value that is a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative integer</a>
1.85 mike 445: greater than zero.</p>
446:
447: <div class="impl">
1.1 mike 448:
449: <p>The <dfn id="concept-select-size" title="concept-select-size">display size</dfn> of a
450: <code><a href="#the-select-element">select</a></code> element is the result of applying the
451: <a href="common-microsyntaxes.html#rules-for-parsing-non-negative-integers">rules for parsing non-negative integers</a> to the value of
452: element's <code title="attr-select-size"><a href="#attr-select-size">size</a></code> attribute, if
453: it has one and parsing it is successful. If applying those rules to
454: the attribute's value is not successful, or if the <code title="attr-select-size"><a href="#attr-select-size">size</a></code> attribute is absent, then the
455: element's <a href="#concept-select-size" title="concept-select-size">display size</a> is 4
456: if the element's <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
457: content attribute is present, and 1 otherwise.</p>
458:
1.85 mike 459: </div>
460:
461: <p>The <dfn id="concept-select-option-list" title="concept-select-option-list">list of options</dfn>
1.1 mike 462: for a <code><a href="#the-select-element">select</a></code> element consists of all the
463: <code><a href="the-option-element.html#the-option-element">option</a></code> element children of the <code><a href="#the-select-element">select</a></code>
464: element, and all the <code><a href="the-option-element.html#the-option-element">option</a></code> element children of all the
465: <code><a href="the-optgroup-element.html#the-optgroup-element">optgroup</a></code> element children of the <code><a href="#the-select-element">select</a></code>
1.85 mike 466: element, in <a href="infrastructure.html#tree-order">tree order</a>.</p>
467:
468: <p>The <dfn id="attr-select-required" title="attr-select-required"><code>required</code></dfn>
1.1 mike 469: attribute is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. When specified, the
470: user will be required to select a value before submitting the
1.85 mike 471: form.</p>
472:
473: <p>If a <code><a href="#the-select-element">select</a></code> element has a <code title="attr-select-required"><a href="#attr-select-required">required</a></code> attribute specified,
1.1 mike 474: does not have a <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
475: attribute specified, and has a <a href="#concept-select-size" title="concept-select-size">display size</a> of 1;
476: and if the <a href="the-option-element.html#concept-option-value" title="concept-option-value">value</a> of the
477: first <code><a href="the-option-element.html#the-option-element">option</a></code> element in the <code><a href="#the-select-element">select</a></code>
478: element's <a href="#concept-select-option-list" title="concept-select-option-list">list of
479: options</a> (if any) is the empty string, and that
480: <code><a href="the-option-element.html#the-option-element">option</a></code> element's parent node is the <code><a href="#the-select-element">select</a></code>
481: element (and not an <code><a href="the-optgroup-element.html#the-optgroup-element">optgroup</a></code> element), then that
482: <code><a href="the-option-element.html#the-option-element">option</a></code> is the <code><a href="#the-select-element">select</a></code> element's
1.85 mike 483: <dfn id="placeholder-label-option">placeholder label option</dfn>.</p>
484:
485: <p>If a <code><a href="#the-select-element">select</a></code> element has a <code title="attr-select-required"><a href="#attr-select-required">required</a></code> attribute specified,
1.1 mike 486: does not have a <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
487: attribute specified, and has a <a href="#concept-select-size" title="concept-select-size">display size</a> of 1,
488: then the <code><a href="#the-select-element">select</a></code> element must have a <a href="#placeholder-label-option">placeholder
1.85 mike 489: label option</a>.</p>
490:
491: <div class="impl">
1.1 mike 492:
493: <p><strong>Constraint validation</strong>: If the element has its
494: <code title="attr-select-required"><a href="#attr-select-required">required</a></code> attribute
495: specified, and either none of the <code><a href="the-option-element.html#the-option-element">option</a></code> elements in
496: the <code><a href="#the-select-element">select</a></code> element's <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> have their
497: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
498: true, or the only <code><a href="the-option-element.html#the-option-element">option</a></code> element in the
499: <code><a href="#the-select-element">select</a></code> element's <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> with its
500: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
501: true is the <a href="#placeholder-label-option">placeholder label option</a>, then the element
502: is <a href="constraints.html#suffering-from-being-missing">suffering from being missing</a>.</p>
503:
1.85 mike 504: </div>
505:
506: <div class="impl">
1.1 mike 507:
508: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
509: attribute is absent, and the element is not <a href="attributes-common-to-form-controls.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a>, then the user agent
510: should allow the user to pick an <code><a href="the-option-element.html#the-option-element">option</a></code> element in its
511: <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> that
512: is itself not <a href="the-option-element.html#concept-option-disabled" title="concept-option-disabled">disabled</a>.
513: Upon this <code><a href="the-option-element.html#the-option-element">option</a></code> element being <dfn id="concept-select-pick" title="concept-select-pick">picked</dfn> (either through a click, or
514: through unfocusing the element after changing its value, or through
515: a <a href="commands.html#using-the-option-element-to-define-a-command" title="option-command">menu command</a>, or through any
516: other mechanism), and before the relevant user interaction event
517: is queued (e.g. before the
518: <code title="event-click"><a href="infrastructure.html#event-click">click</a></code> event), the user agent must
519: set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of the
520: picked <code><a href="the-option-element.html#the-option-element">option</a></code> element to true and then <a href="webappapis.html#queue-a-task">queue a
521: task</a> to <a href="webappapis.html#fire-a-simple-event">fire a simple event</a> that bubbles named
522: <code title="event-change">change</code> at the <code><a href="#the-select-element">select</a></code>
523: element, using the <a href="webappapis.html#user-interaction-task-source">user interaction task source</a> as the
524: task source.</p>
525:
526: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
527: attribute is absent, whenever an <code><a href="the-option-element.html#the-option-element">option</a></code> element in the
528: <code><a href="#the-select-element">select</a></code> element's <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> has its
529: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
530: true, and whenever an <code><a href="the-option-element.html#the-option-element">option</a></code> element with its <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to true
531: is added to the <code><a href="#the-select-element">select</a></code> element's <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>, the user
532: agent must set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of all the
533: other <code><a href="the-option-element.html#the-option-element">option</a></code> element in its <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> to
534: false.</p>
535:
536: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
537: attribute is absent and the element's <a href="#concept-select-size" title="concept-select-size">display size</a> is greater than 1,
538: then the user agent should also allow the user to request that the
539: <code><a href="the-option-element.html#the-option-element">option</a></code> whose <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> is true, if
540: any, be unselected. Upon this request being conveyed to the user
541: agent, and before the relevant user interaction event is queued (e.g. before the <code title="event-click"><a href="infrastructure.html#event-click">click</a></code> event), the user agent must set the
542: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of
543: that <code><a href="the-option-element.html#the-option-element">option</a></code> element to false and then <a href="webappapis.html#queue-a-task">queue a
544: task</a> to <a href="webappapis.html#fire-a-simple-event">fire a simple event</a> that bubbles named
545: <code title="event-change">change</code> at the <code><a href="#the-select-element">select</a></code>
546: element, using the <a href="webappapis.html#user-interaction-task-source">user interaction task source</a> as the
547: task source.</p>
548:
549: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
550: attribute is absent and the element's <a href="#concept-select-size" title="concept-select-size">display size</a> is 1, then whenever
551: there are no <code><a href="the-option-element.html#the-option-element">option</a></code> elements in the <code><a href="#the-select-element">select</a></code>
552: element's <a href="#concept-select-option-list" title="concept-select-option-list">list of
553: options</a> that have their <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to true,
554: the user agent must set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of the first
555: <code><a href="the-option-element.html#the-option-element">option</a></code> element in the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> in
556: <a href="infrastructure.html#tree-order">tree order</a> that is not <a href="the-option-element.html#concept-option-disabled" title="concept-option-disabled">disabled</a>, if any, to
557: true.</p>
558:
559: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
560: attribute is present, and the element is not <a href="attributes-common-to-form-controls.html#concept-fe-disabled" title="concept-fe-disabled">disabled</a>, then the user agent
561: should allow the user to <dfn id="concept-select-toggle" title="concept-select-toggle">toggle</dfn> the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of the
562: <code><a href="the-option-element.html#the-option-element">option</a></code> elements in its <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> that are
563: themselves not <a href="the-option-element.html#concept-option-disabled" title="concept-option-disabled">disabled</a>
564: (either through a click, or through a <a href="commands.html#using-the-option-element-to-define-a-command" title="option-command">menu command</a>, or any other mechanism).
565: Upon the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of one or
566: more <code><a href="the-option-element.html#the-option-element">option</a></code> elements being changed by the user, and
567: before the relevant user interaction event is queued (e.g. before a related <code title="event-click"><a href="infrastructure.html#event-click">click</a></code> event), the user agent must
568: <a href="webappapis.html#queue-a-task">queue a task</a> to <a href="webappapis.html#fire-a-simple-event">fire a simple event</a> that
569: bubbles named <code title="event-change">change</code> at the
570: <code><a href="#the-select-element">select</a></code> element, using the <a href="webappapis.html#user-interaction-task-source">user interaction task
571: source</a> as the task source.</p>
572:
573: <p>The <a href="form-submission.html#concept-form-reset-control" title="concept-form-reset-control">reset
574: algorithm</a> for <code><a href="#the-select-element">select</a></code> elements is to go through
575: all the <code><a href="the-option-element.html#the-option-element">option</a></code> elements in the element's <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>, and set
576: their <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a>
577: to true if the <code><a href="the-option-element.html#the-option-element">option</a></code> element has a <code title="attr-option-selected"><a href="the-option-element.html#attr-option-selected">selected</a></code> attribute, and false
578: otherwise.</p>
579:
1.85 mike 580: </div>
581:
582: <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
1.1 mike 583: explicitly associate the <code><a href="#the-select-element">select</a></code> element with its
584: <a href="association-of-controls-and-forms.html#form-owner">form owner</a>. The <code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code>
585: attribute represents the element's name. The <code title="attr-fe-disabled"><a href="attributes-common-to-form-controls.html#attr-fe-disabled">disabled</a></code> attribute is used to make
586: the control non-interactive and to prevent its value from being
587: submitted. The <code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code>
1.85 mike 588: attribute controls focus.</p>
589:
590:
591: <dl class="domintro"><dt><var title="">select</var> . <code title="dom-select-type"><a href="#dom-select-type">type</a></code></dt>
1.1 mike 592:
593: <dd>
594:
595: <p>Returns "<code title="">select-multiple</code>" if the element
596: has a <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
597: attribute, and "<code title="">select-one</code>"
598: otherwise.</p>
599:
600: </dd>
601:
602: <dt><var title="">select</var> . <code title="dom-select-options"><a href="#dom-select-options">options</a></code></dt>
603:
604: <dd>
605:
606: <p>Returns an <code><a href="common-dom-interfaces.html#htmloptionscollection">HTMLOptionsCollection</a></code> of the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
607:
608: </dd>
609:
610: <dt><var title="">select</var> . <code title="dom-select-length"><a href="#dom-select-length">length</a></code> [ = <var title="">value</var> ]</dt>
611: <dd>
612: <p>Returns the number of elements in the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
613: <p>When set to a smaller number, truncates the number of <code><a href="the-option-element.html#the-option-element">option</a></code> elements in the <code><a href="#the-select-element">select</a></code>.</p>
614: <p>When set to a greater number, adds new blank <code><a href="the-option-element.html#the-option-element">option</a></code> elements to the <code><a href="#the-select-element">select</a></code>.</p>
615: </dd>
616:
617: <dt><var title="">element</var> = <var title="">select</var> . <code title="dom-select-item"><a href="#dom-select-item">item</a></code>(<var title="">index</var>)</dt>
618: <dt><var title="">select</var>[<var title="">index</var>]</dt>
619: <dd>
620: <p>Returns the item with index <var title="">index</var> from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>. The items are sorted in <a href="infrastructure.html#tree-order">tree order</a>.</p>
621: </dd>
622:
623: <dt><var title="">element</var> = <var title="">select</var> . <code title="dom-select-item"><a href="#dom-select-item">namedItem</a></code>(<var title="">name</var>)</dt>
624: <dd>
625: <p>Returns the item with <a href="infrastructure.html#concept-id" title="concept-id">ID</a> or <code title="attr-option-name"><a href="obsolete.html#attr-option-name">name</a></code> <var title="">name</var> from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
626: <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>
627: <p>Returns null if no element with that <a href="infrastructure.html#concept-id" title="concept-id">ID</a> could be found.</p>
628: </dd>
629:
630: <dt><var title="">select</var> . <code title="dom-select-add"><a href="#dom-select-add">add</a></code>(<var title="">element</var> [, <var title="">before</var> ])</dt>
631: <dd>
632: <p>Inserts <var title="">element</var> before the node given by <var title="">before</var>.</p>
633: <p>The <var title="">before</var> argument can be a number, in
634: which case <var title="">element</var> is inserted before the item
635: with that number, or an element from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>, in
636: which case <var title="">element</var> is inserted before that
637: element.</p>
638: <p>If <var title="">before</var> is omitted, null, or a number out
639: of range, then <var title="">element</var> will be added at the
640: end of the list.</p>
641: <p>This method will throw a <code><a href="infrastructure.html#hierarchyrequesterror">HierarchyRequestError</a></code>
642: exception if <var title="">element</var> is an ancestor of the
643: element into which it is to be inserted.</p>
644: </dd>
645:
646: <dt><var title="">select</var> . <code title="dom-select-selectedOptions"><a href="#dom-select-selectedoptions">selectedOptions</a></code></dt>
647:
648: <dd>
649:
650: <p>Returns an <code><a href="infrastructure.html#htmlcollection">HTMLCollection</a></code> of the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> that are
651: selected.</p>
652:
653: </dd>
654:
655: <dt><var title="">select</var> . <code title="dom-select-selectedIndex"><a href="#dom-select-selectedindex">selectedIndex</a></code> [ = <var title="">value</var> ]</dt>
656:
657: <dd>
658:
659: <p>Returns the index of the first selected item, if any, or
660: −1 if there is no selected item.</p>
661:
662: <p>Can be set, to change the selection.</p>
663:
664: </dd>
665:
666: <dt><var title="">select</var> . <code title="dom-select-value"><a href="#dom-select-value">value</a></code> [ = <var title="">value</var> ]</dt>
667:
668: <dd>
669:
670: <p>Returns the <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> of the
671: first selected item, if any, or the empty string if there is no
672: selected item.</p>
673:
674: <p>Can be set, to change the selection.</p>
675:
676: </dd>
677:
678: </dl><div class="impl">
679:
680: <p>The <dfn id="dom-select-type" title="dom-select-type"><code>type</code></dfn> IDL
681: attribute, on getting, must return the string "<code title="">select-one</code>" if the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code> attribute is absent,
682: and the string "<code title="">select-multiple</code>" if the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code> attribute is
683: present.</p>
684:
685: <p>The <dfn id="dom-select-options" title="dom-select-options"><code>options</code></dfn>
686: IDL attribute must return an <code><a href="common-dom-interfaces.html#htmloptionscollection">HTMLOptionsCollection</a></code>
687: rooted at the <code><a href="#the-select-element">select</a></code> node, whose filter matches the
688: elements in the <a href="#concept-select-option-list" title="concept-select-option-list">list of
689: options</a>.</p>
690:
691: <p>The <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection is
692: also mirrored on the <code><a href="#htmlselectelement">HTMLSelectElement</a></code> object. The
693: <a href="infrastructure.html#supported-property-indices">supported property indices</a> at any instant are the
694: indices supported by the object returned by the <code title="dom-select-options"><a href="#dom-select-options">options</a></code> attribute at that
695: instant.</p>
696:
697: <p>The <dfn id="dom-select-length" title="dom-select-length"><code>length</code></dfn> IDL
698: attribute must return the number of nodes <a href="infrastructure.html#represented-by-the-collection" title="represented
699: by the collection">represented</a> by the <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection. On setting, it
700: must act like the attribute of the same name on the <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection.</p>
701:
702: <p>The <dfn id="dom-select-item" title="dom-select-item"><code>item(<var title="">index</var>)</code></dfn> method must return the value
703: returned by the method of the same name on the <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection, when invoked
704: with the same argument.</p>
705:
706: <p>The <dfn id="dom-select-nameditem" title="dom-select-namedItem"><code>namedItem(<var title="">name</var>)</code></dfn> method must return the value
707: returned by the method of the same name on the <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection, when invoked
708: with the same argument.</p>
709:
710: <p>When the user agent is to <dfn id="dom-htmlselectelement-setter" title="dom-HTMLSelectElement-setter">set the value of a new indexed
711: property</dfn> for a given property index <var title="">index</var>
712: to a new value <var title="">value</var>, it must instead <a href="common-dom-interfaces.html#dom-htmloptionscollection-setter" title="dom-HTMLOptionsCollection-setter">set the value of a new
713: indexed property</a> with the given property index <var title="">index</var> to the new value <var title="">value</var> on the
714: <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection.</p>
715:
716: <p>Similarly, the <dfn id="dom-select-add" title="dom-select-add"><code>add()</code></dfn> and <dfn id="dom-select-remove" title="dom-select-remove"><code>remove()</code></dfn> methods must
717: act like their namesake methods on that same <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection.</p>
718:
719: <p>The <dfn id="dom-select-selectedoptions" title="dom-select-selectedOptions"><code>selectedOptions</code></dfn>
720: IDL attribute must return an <code><a href="infrastructure.html#htmlcollection">HTMLCollection</a></code> rooted at
721: the <code><a href="#the-select-element">select</a></code> node, whose filter matches the elements in
722: the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>
723: that have their <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
724: true.</p>
725:
726: <p>The <dfn id="dom-select-selectedindex" title="dom-select-selectedIndex"><code>selectedIndex</code></dfn>
727: IDL attribute, on getting, must return the <a href="the-option-element.html#concept-option-index" title="concept-option-index">index</a> of the first
728: <code><a href="the-option-element.html#the-option-element">option</a></code> element in the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> in
729: <a href="infrastructure.html#tree-order">tree order</a> that has its <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to true,
730: if any. If there isn't one, then it must return −1.</p>
731:
732: <p>On setting, the <code title="dom-select-selectedIndex"><a href="#dom-select-selectedindex">selectedIndex</a></code> attribute must
733: set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of all the
734: <code><a href="the-option-element.html#the-option-element">option</a></code> elements in the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> to false,
735: and then the <code><a href="the-option-element.html#the-option-element">option</a></code> element in the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> whose
736: <a href="the-option-element.html#concept-option-index" title="concept-option-index">index</a> is the given new
737: value, if any, must have its <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
738: true.</p>
739:
740: <p>The <dfn id="dom-select-value" title="dom-select-value"><code>value</code></dfn> IDL
741: attribute, on getting, must return the <a href="the-option-element.html#concept-option-value" title="concept-option-value">value</a> of the first
742: <code><a href="the-option-element.html#the-option-element">option</a></code> element in the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> in
743: <a href="infrastructure.html#tree-order">tree order</a> that has its <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to true,
744: if any. If there isn't one, then it must return the empty
745: string.</p>
746:
747: <p>On setting, the <code title="dom-select-value"><a href="#dom-select-value">value</a></code>
748: attribute must set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of all the
749: <code><a href="the-option-element.html#the-option-element">option</a></code> elements in the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> to false,
750: and then the first <code><a href="the-option-element.html#the-option-element">option</a></code> element in the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>, in
751: <a href="infrastructure.html#tree-order">tree order</a>, whose <a href="the-option-element.html#concept-option-value" title="concept-option-value">value</a> is equal to the given new
752: value, if any, must have its <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
753: true.</p>
754:
755: <p>The <dfn id="dom-select-multiple" title="dom-select-multiple"><code>multiple</code></dfn>,
756: <dfn id="dom-select-required" title="dom-select-required"><code>required</code></dfn>, and
757: <dfn id="dom-select-size" title="dom-select-size"><code>size</code></dfn> IDL attributes
758: must <a href="common-dom-interfaces.html#reflect">reflect</a> the respective content attributes of the
759: same name. The <code title="dom-select-size"><a href="#dom-select-size">size</a></code> IDL
760: attribute has a default value of zero.</p>
1.4 mike 761:
1.1 mike 762: <p class="note">For historical reasons, the default value of the
763: <code title="dom-select-size"><a href="#dom-select-size">size</a></code> IDL attribute does not
764: return the actual size used, which, in the absence of the <code title="attr-select-size"><a href="#attr-select-size">size</a></code> content attribute, is either 1
765: or 4 depending on the presence of the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code> attribute.</p>
766:
767: <p>The <code title="dom-cva-willValidate"><a href="constraints.html#dom-cva-willvalidate">willValidate</a></code>, <code title="dom-cva-validity"><a href="constraints.html#dom-cva-validity">validity</a></code>, and <code title="dom-cva-validationMessage"><a href="constraints.html#dom-cva-validationmessage">validationMessage</a></code>
768: attributes, and the <code title="dom-cva-checkValidatity"><a href="constraints.html#dom-cva-checkvalidatity">checkValidity()</a></code> and <code title="dom-cva-setCustomValidity"><a href="constraints.html#dom-cva-setcustomvalidity">setCustomValidity()</a></code>
769: methods, are part of the <a href="constraints.html#the-constraint-validation-api">constraint validation API</a>. The
770: <code title="dom-lfe-labels"><a href="the-label-element.html#dom-lfe-labels">labels</a></code> attribute provides a list
771: of the element's <code><a href="the-label-element.html#the-label-element">label</a></code>s. The <code title="dom-fe-autofocus"><a href="attributes-common-to-form-controls.html#dom-fe-autofocus">autofocus</a></code>, <code title="dom-fe-disabled"><a href="attributes-common-to-form-controls.html#dom-fe-disabled">disabled</a></code>, <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="attributes-common-to-form-controls.html#dom-fe-name">name</a></code> IDL attributes are part of the
772: element's forms API.</p>
773:
1.85 mike 774: </div>
775:
776:
777: <div class="example">
1.1 mike 778:
779: <p>The following example shows how a <code><a href="#the-select-element">select</a></code> element
780: can be used to offer the user with a set of options from which the
781: user can select a single option. The default option is
782: preselected.</p>
783:
784: <pre><p>
785: <label for="unittype">Select unit type:</label>
786: <select id="unittype" name="unittype">
787: <option value="1"> Miner </option>
788: <option value="2"> Puffer </option>
789: <option value="3" selected> Snipey </option>
790: <option value="4"> Max </option>
791: <option value="5"> Firebot </option>
792: </select>
793: </p></pre>
794:
795: <p>When there is no default option, a placeholder can be used
796: instead:</p>
797:
798: <pre><select name="unittype" <strong>required</strong>>
799: <strong><option value=""> Select unit type </option></strong>
800: <option value="1"> Miner </option>
801: <option value="2"> Puffer </option>
802: <option value="3"> Snipey </option>
803: <option value="4"> Max </option>
804: <option value="5"> Firebot </option>
805: </select></pre>
806:
1.85 mike 807: </div>
808:
809: <div class="example">
1.1 mike 810:
811: <p>Here, the user is offered a set of options from which he can
812: select any number. By default, all five options are selected.</p>
813:
814: <pre><p>
815: <label for="allowedunits">Select unit types to enable on this map:</label>
816: <select id="allowedunits" name="allowedunits" multiple>
817: <option value="1" selected> Miner </option>
818: <option value="2" selected> Puffer </option>
819: <option value="3" selected> Snipey </option>
820: <option value="4" selected> Max </option>
821: <option value="5" selected> Firebot </option>
822: </select>
823: </p></pre>
824:
1.85 mike 825: </div>
826:
827: <div class="example">
1.1 mike 828:
829: <p>Sometimes, a user has to select one or more items. This example
830: shows such an interface.</p>
831:
832: <pre><p>Select the songs from that you would like on your Act II Mix Tape:</p>
833: <select multiple required name="act2">
834: <option value="s1">It Sucks to Be Me (Reprise)
835: <option value="s2">There is Life Outside Your Apartment
836: <option value="s3">The More You Ruv Someone
837: <option value="s4">Schadenfreude
838: <option value="s5">I Wish I Could Go Back to College
839: <option value="s6">The Money Song
840: <option value="s7">School for Monsters
841: <option value="s8">The Money Song (Reprise)
842: <option value="s9">There's a Fine, Fine Line (Reprise)
843: <option value="s10">What Do You Do With a B.A. in English? (Reprise)
844: <option value="s11">For Now
845: </select></pre>
846:
1.85 mike 847: </div>
848:
849:
850:
851: </body></html>
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