Annotation of html5/spec/the-select-element.html, revision 1.164
1.88 mike 1: <!DOCTYPE html>
1.159 sruby 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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1.1 mike 197:
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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) {
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1.159 sruby 319: </script><link href="the-button-element.html" title="4.10.8 The button element" rel="prev">
1.161 sruby 320: <link href="spec.html#contents" title="Table of contents" rel="contents">
1.1 mike 321: <link href="the-datalist-element.html" title="4.10.10 The datalist 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>
1.164 ! sruby 327: <h2 class="no-num no-toc" id="editor's-draft-date-1-january-1970">Editor's Draft 1 September 2012</h2>
1.85 mike 328: </div>
329:
1.159 sruby 330: <div class="prev_next">
1.1 mike 331: <a href="the-button-element.html">← 4.10.8 The button element</a> –
1.161 sruby 332: <a href="spec.html#contents">Table of contents</a> –
1.1 mike 333: <a href="the-datalist-element.html">4.10.10 The datalist element →</a>
1.159 sruby 334: </div>
1.1 mike 335:
1.85 mike 336: <h4 id="the-select-element"><span class="secno">4.10.9 </span>The <dfn><code>select</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#phrasing-content-1">Phrasing content</a>.</dd>
341: <dd><a href="content-models.html#interactive-content-0">Interactive content</a>.</dd>
1.1 mike 342: <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>
1.159 sruby 343: <dd><a href="content-models.html#palpable-content-0">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>
1.159 sruby 345: <dd>Where <a href="content-models.html#phrasing-content-1">phrasing 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>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 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-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code></dd>
351: <dd><code title="attr-fe-disabled"><a href="attributes-common-to-form-controls.html#attr-fe-disabled">disabled</a></code></dd>
352: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
353: <dd><code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code></dd>
354: <dd><code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code></dd>
355: <dd><code title="attr-select-required"><a href="#attr-select-required">required</a></code></dd>
356: <dd><code title="attr-select-size"><a href="#attr-select-size">size</a></code></dd>
1.159 sruby 357: <dt><a href="element-definitions.html#element-dfn-dom" title="element-dfn-dom">DOM interface</a>:</dt><!--TOPIC:DOM APIs-->
1.1 mike 358: <dd>
359: <pre class="idl">interface <dfn id="htmlselectelement">HTMLSelectElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
360: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-autofocus" title="dom-fe-autofocus">autofocus</a>;
361: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-disabled" title="dom-fe-disabled">disabled</a>;
362: 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>;
363: attribute boolean <a href="#dom-select-multiple" title="dom-select-multiple">multiple</a>;
364: attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fe-name" title="dom-fe-name">name</a>;
365: attribute boolean <a href="#dom-select-required" title="dom-select-required">required</a>;
366: attribute unsigned long <a href="#dom-select-size" title="dom-select-size">size</a>;
367:
368: readonly attribute DOMString <a href="#dom-select-type" title="dom-select-type">type</a>;
369:
1.159 sruby 370: readonly attribute <a href="common-dom-interfaces.html#htmloptionscollection-0">HTMLOptionsCollection</a> <a href="#dom-select-options" title="dom-select-options">options</a>;
1.1 mike 371: attribute unsigned long <a href="#dom-select-length" title="dom-select-length">length</a>;
372: getter <a href="infrastructure.html#element">Element</a> <a href="#dom-select-item" title="dom-select-item">item</a>(unsigned long index);
373: object <a href="#dom-select-nameditem" title="dom-select-namedItem">namedItem</a>(DOMString name);
1.74 mike 374: 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 375: void <a href="#dom-select-remove" title="dom-select-remove">remove</a>(long index);
376: <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);
377:
378: readonly attribute <a href="infrastructure.html#htmlcollection">HTMLCollection</a> <a href="#dom-select-selectedoptions" title="dom-select-selectedOptions">selectedOptions</a>;
379: attribute long <a href="#dom-select-selectedindex" title="dom-select-selectedIndex">selectedIndex</a>;
380: attribute DOMString <a href="#dom-select-value" title="dom-select-value">value</a>;
381:
382: readonly attribute boolean <a href="constraints.html#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
383: readonly attribute <a href="constraints.html#validitystate">ValidityState</a> <a href="constraints.html#dom-cva-validity" title="dom-cva-validity">validity</a>;
384: readonly attribute DOMString <a href="constraints.html#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
385: boolean <a href="constraints.html#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
386: void <a href="constraints.html#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(DOMString error);
387:
388: readonly attribute <a href="infrastructure.html#nodelist">NodeList</a> <a href="the-label-element.html#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
389: };</pre>
390: </dd>
1.159 sruby 391: </dl><!--TOPIC:HTML--><!-- Proposals for v2:
392: * <select value=""> as an alternative to <option selected>
393: http://developers.slashdot.org/comments.pl?sid=426306&cid=22142072
394: <Philip`> http://www.ipiao.com.cn/ does <select size="1" name="to"><script>City_Default="PEK"</script><SCRIPT language=javascript
395: src="/js/flightcity.js"></SCRIPT></select> which is the kind of thing that could be much simpler with <select value="PEK">
396: --><p>The <code><a href="#the-select-element">select</a></code> element represents a control for
1.85 mike 397: selecting amongst a set of options.</p>
398:
399: <p>The <dfn id="attr-select-multiple" title="attr-select-multiple"><code>multiple</code></dfn>
1.1 mike 400: attribute is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. If the attribute is
401: present, then the <code><a href="#the-select-element">select</a></code> element
402: <a href="rendering.html#represents">represents</a> a control for selecting zero or more options
403: from the <a href="#concept-select-option-list" title="concept-select-option-list">list of
404: options</a>. If the attribute is absent, then the
405: <code><a href="#the-select-element">select</a></code> element <a href="rendering.html#represents">represents</a> a control for
1.85 mike 406: selecting a single option from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
407:
408: <p>The <dfn id="attr-select-size" title="attr-select-size"><code>size</code></dfn>
1.1 mike 409: 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
410: have a value that is a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative integer</a>
1.85 mike 411: greater than zero.</p>
412:
413: <div class="impl">
1.1 mike 414:
415: <p>The <dfn id="concept-select-size" title="concept-select-size">display size</dfn> of a
416: <code><a href="#the-select-element">select</a></code> element is the result of applying the
417: <a href="common-microsyntaxes.html#rules-for-parsing-non-negative-integers">rules for parsing non-negative integers</a> to the value of
418: element's <code title="attr-select-size"><a href="#attr-select-size">size</a></code> attribute, if
419: it has one and parsing it is successful. If applying those rules to
420: 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
421: element's <a href="#concept-select-size" title="concept-select-size">display size</a> is 4
422: if the element's <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
423: content attribute is present, and 1 otherwise.</p>
424:
1.85 mike 425: </div>
426:
427: <p>The <dfn id="concept-select-option-list" title="concept-select-option-list">list of options</dfn>
1.1 mike 428: for a <code><a href="#the-select-element">select</a></code> element consists of all the
429: <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>
430: element, and all the <code><a href="the-option-element.html#the-option-element">option</a></code> element children of all the
431: <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 432: element, in <a href="infrastructure.html#tree-order">tree order</a>.</p>
433:
434: <p>The <dfn id="attr-select-required" title="attr-select-required"><code>required</code></dfn>
1.1 mike 435: attribute is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. When specified, the
436: user will be required to select a value before submitting the
1.85 mike 437: form.</p>
438:
439: <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 440: does not have a <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
441: attribute specified, and has a <a href="#concept-select-size" title="concept-select-size">display size</a> of 1;
442: and if the <a href="the-option-element.html#concept-option-value" title="concept-option-value">value</a> of the
443: 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>
444: element's <a href="#concept-select-option-list" title="concept-select-option-list">list of
445: options</a> (if any) is the empty string, and that
446: <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>
447: element (and not an <code><a href="the-optgroup-element.html#the-optgroup-element">optgroup</a></code> element), then that
448: <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 449: <dfn id="placeholder-label-option">placeholder label option</dfn>.</p>
450:
451: <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 452: does not have a <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
453: attribute specified, and has a <a href="#concept-select-size" title="concept-select-size">display size</a> of 1,
454: then the <code><a href="#the-select-element">select</a></code> element must have a <a href="#placeholder-label-option">placeholder
1.85 mike 455: label option</a>.</p>
456:
457: <div class="impl">
1.1 mike 458:
459: <p><strong>Constraint validation</strong>: If the element has its
460: <code title="attr-select-required"><a href="#attr-select-required">required</a></code> attribute
461: specified, and either none of the <code><a href="the-option-element.html#the-option-element">option</a></code> elements in
462: 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
463: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
464: true, or the only <code><a href="the-option-element.html#the-option-element">option</a></code> element in the
465: <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
466: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
467: true is the <a href="#placeholder-label-option">placeholder label option</a>, then the element
468: is <a href="constraints.html#suffering-from-being-missing">suffering from being missing</a>.</p>
469:
1.85 mike 470: </div>
471:
472: <div class="impl">
1.1 mike 473:
474: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
475: 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
476: should allow the user to pick an <code><a href="the-option-element.html#the-option-element">option</a></code> element in its
477: <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> that
478: is itself not <a href="the-option-element.html#concept-option-disabled" title="concept-option-disabled">disabled</a>.
479: 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
480: through unfocusing the element after changing its value, or through
481: a <a href="commands.html#using-the-option-element-to-define-a-command" title="option-command">menu command</a>, or through any
482: other mechanism), and before the relevant user interaction event
1.159 sruby 483: <!-- interaction event spec point --> is queued (e.g. before the
1.1 mike 484: <code title="event-click"><a href="infrastructure.html#event-click">click</a></code> event), the user agent must
485: set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of the
486: 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
487: task</a> to <a href="webappapis.html#fire-a-simple-event">fire a simple event</a> that bubbles named
488: <code title="event-change">change</code> at the <code><a href="#the-select-element">select</a></code>
489: element, using the <a href="webappapis.html#user-interaction-task-source">user interaction task source</a> as the
490: task source.</p>
491:
492: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
493: attribute is absent, whenever an <code><a href="the-option-element.html#the-option-element">option</a></code> element in the
494: <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
495: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
496: 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
497: 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
498: agent must set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of all the
499: 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
500: false.</p>
501:
502: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
503: attribute is absent and the element's <a href="#concept-select-size" title="concept-select-size">display size</a> is greater than 1,
504: then the user agent should also allow the user to request that the
505: <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
506: any, be unselected. Upon this request being conveyed to the user
1.159 sruby 507: agent, and before the relevant user interaction event <!--
508: interaction event spec point --> 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
1.1 mike 509: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of
510: 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
511: task</a> to <a href="webappapis.html#fire-a-simple-event">fire a simple event</a> that bubbles named
512: <code title="event-change">change</code> at the <code><a href="#the-select-element">select</a></code>
513: element, using the <a href="webappapis.html#user-interaction-task-source">user interaction task source</a> as the
514: task source.</p>
515:
516: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
517: attribute is absent and the element's <a href="#concept-select-size" title="concept-select-size">display size</a> is 1, then whenever
518: 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>
519: element's <a href="#concept-select-option-list" title="concept-select-option-list">list of
520: options</a> that have their <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to true,
521: the user agent must set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of the first
522: <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
523: <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
524: true.</p>
525:
526: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
527: 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
528: 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
529: <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
530: themselves not <a href="the-option-element.html#concept-option-disabled" title="concept-option-disabled">disabled</a>
531: (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).
532: Upon the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of one or
533: more <code><a href="the-option-element.html#the-option-element">option</a></code> elements being changed by the user, and
1.159 sruby 534: before the relevant user interaction event <!-- interaction event
535: spec point --> 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
1.1 mike 536: <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
537: bubbles named <code title="event-change">change</code> at the
538: <code><a href="#the-select-element">select</a></code> element, using the <a href="webappapis.html#user-interaction-task-source">user interaction task
539: source</a> as the task source.</p>
540:
1.159 sruby 541: <p>The <a href="constraints.html#concept-form-reset-control" title="concept-form-reset-control">reset
1.1 mike 542: algorithm</a> for <code><a href="#the-select-element">select</a></code> elements is to go through
543: 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
544: their <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a>
545: 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
546: otherwise.</p>
547:
1.85 mike 548: </div>
549:
550: <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 551: explicitly associate the <code><a href="#the-select-element">select</a></code> element with its
552: <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>
553: 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
554: the control non-interactive and to prevent its value from being
555: submitted. The <code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code>
1.85 mike 556: attribute controls focus.</p>
557:
1.159 sruby 558: <!--TOPIC:DOM APIs-->
1.85 mike 559: <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 560:
561: <dd>
562:
563: <p>Returns "<code title="">select-multiple</code>" if the element
564: has a <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
565: attribute, and "<code title="">select-one</code>"
566: otherwise.</p>
567:
568: </dd>
569:
570: <dt><var title="">select</var> . <code title="dom-select-options"><a href="#dom-select-options">options</a></code></dt>
571:
572: <dd>
573:
1.159 sruby 574: <p>Returns an <code><a href="common-dom-interfaces.html#htmloptionscollection-0">HTMLOptionsCollection</a></code> of the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
1.1 mike 575:
576: </dd>
577:
578: <dt><var title="">select</var> . <code title="dom-select-length"><a href="#dom-select-length">length</a></code> [ = <var title="">value</var> ]</dt>
579: <dd>
580: <p>Returns the number of elements in the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
581: <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>
582: <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>
583: </dd>
584:
585: <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>
586: <dt><var title="">select</var>[<var title="">index</var>]</dt>
587: <dd>
588: <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>
589: </dd>
590:
591: <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>
592: <dd>
593: <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>
594: <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>
595: <p>Returns null if no element with that <a href="infrastructure.html#concept-id" title="concept-id">ID</a> could be found.</p>
596: </dd>
597:
598: <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>
599: <dd>
600: <p>Inserts <var title="">element</var> before the node given by <var title="">before</var>.</p>
601: <p>The <var title="">before</var> argument can be a number, in
602: which case <var title="">element</var> is inserted before the item
603: with that number, or an element from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>, in
604: which case <var title="">element</var> is inserted before that
605: element.</p>
606: <p>If <var title="">before</var> is omitted, null, or a number out
607: of range, then <var title="">element</var> will be added at the
608: end of the list.</p>
609: <p>This method will throw a <code><a href="infrastructure.html#hierarchyrequesterror">HierarchyRequestError</a></code>
610: exception if <var title="">element</var> is an ancestor of the
611: element into which it is to be inserted.</p>
612: </dd>
613:
614: <dt><var title="">select</var> . <code title="dom-select-selectedOptions"><a href="#dom-select-selectedoptions">selectedOptions</a></code></dt>
615:
616: <dd>
617:
618: <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
619: selected.</p>
620:
621: </dd>
622:
623: <dt><var title="">select</var> . <code title="dom-select-selectedIndex"><a href="#dom-select-selectedindex">selectedIndex</a></code> [ = <var title="">value</var> ]</dt>
624:
625: <dd>
626:
627: <p>Returns the index of the first selected item, if any, or
628: −1 if there is no selected item.</p>
629:
630: <p>Can be set, to change the selection.</p>
631:
632: </dd>
633:
634: <dt><var title="">select</var> . <code title="dom-select-value"><a href="#dom-select-value">value</a></code> [ = <var title="">value</var> ]</dt>
635:
636: <dd>
637:
638: <p>Returns the <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> of the
639: first selected item, if any, or the empty string if there is no
640: selected item.</p>
641:
642: <p>Can be set, to change the selection.</p>
643:
644: </dd>
645:
646: </dl><div class="impl">
647:
648: <p>The <dfn id="dom-select-type" title="dom-select-type"><code>type</code></dfn> IDL
649: 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,
650: 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
651: present.</p>
652:
653: <p>The <dfn id="dom-select-options" title="dom-select-options"><code>options</code></dfn>
1.159 sruby 654: IDL attribute must return an <code><a href="common-dom-interfaces.html#htmloptionscollection-0">HTMLOptionsCollection</a></code>
1.1 mike 655: rooted at the <code><a href="#the-select-element">select</a></code> node, whose filter matches the
656: elements in the <a href="#concept-select-option-list" title="concept-select-option-list">list of
657: options</a>.</p>
658:
659: <p>The <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection is
660: also mirrored on the <code><a href="#htmlselectelement">HTMLSelectElement</a></code> object. The
661: <a href="infrastructure.html#supported-property-indices">supported property indices</a> at any instant are the
662: indices supported by the object returned by the <code title="dom-select-options"><a href="#dom-select-options">options</a></code> attribute at that
663: instant.</p>
664:
665: <p>The <dfn id="dom-select-length" title="dom-select-length"><code>length</code></dfn> IDL
666: attribute must return the number of nodes <a href="infrastructure.html#represented-by-the-collection" title="represented
667: by the collection">represented</a> by the <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection. On setting, it
668: 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>
669:
670: <p>The <dfn id="dom-select-item" title="dom-select-item"><code>item(<var title="">index</var>)</code></dfn> method must return the value
671: 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
672: with the same argument.</p>
673:
674: <p>The <dfn id="dom-select-nameditem" title="dom-select-namedItem"><code>namedItem(<var title="">name</var>)</code></dfn> method must return the value
675: 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
676: with the same argument.</p>
677:
678: <p>When the user agent is to <dfn id="dom-htmlselectelement-setter" title="dom-HTMLSelectElement-setter">set the value of a new indexed
679: property</dfn> for a given property index <var title="">index</var>
680: 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
681: indexed property</a> with the given property index <var title="">index</var> to the new value <var title="">value</var> on the
682: <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection.</p>
683:
684: <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
685: act like their namesake methods on that same <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection.</p>
686:
687: <p>The <dfn id="dom-select-selectedoptions" title="dom-select-selectedOptions"><code>selectedOptions</code></dfn>
688: IDL attribute must return an <code><a href="infrastructure.html#htmlcollection">HTMLCollection</a></code> rooted at
689: the <code><a href="#the-select-element">select</a></code> node, whose filter matches the elements in
690: the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>
691: that have their <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
692: true.</p>
693:
694: <p>The <dfn id="dom-select-selectedindex" title="dom-select-selectedIndex"><code>selectedIndex</code></dfn>
695: 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
696: <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
697: <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,
698: if any. If there isn't one, then it must return −1.</p>
699:
700: <p>On setting, the <code title="dom-select-selectedIndex"><a href="#dom-select-selectedindex">selectedIndex</a></code> attribute must
701: set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of all the
702: <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,
703: 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
704: <a href="the-option-element.html#concept-option-index" title="concept-option-index">index</a> is the given new
705: value, if any, must have its <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
706: true.</p>
707:
708: <p>The <dfn id="dom-select-value" title="dom-select-value"><code>value</code></dfn> IDL
709: attribute, on getting, must return the <a href="the-option-element.html#concept-option-value" title="concept-option-value">value</a> of the first
710: <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
711: <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,
712: if any. If there isn't one, then it must return the empty
713: string.</p>
714:
715: <p>On setting, the <code title="dom-select-value"><a href="#dom-select-value">value</a></code>
716: attribute must set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of all the
717: <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,
718: 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
719: <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
720: value, if any, must have its <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
721: true.</p>
722:
723: <p>The <dfn id="dom-select-multiple" title="dom-select-multiple"><code>multiple</code></dfn>,
724: <dfn id="dom-select-required" title="dom-select-required"><code>required</code></dfn>, and
725: <dfn id="dom-select-size" title="dom-select-size"><code>size</code></dfn> IDL attributes
726: must <a href="common-dom-interfaces.html#reflect">reflect</a> the respective content attributes of the
727: same name. The <code title="dom-select-size"><a href="#dom-select-size">size</a></code> IDL
1.159 sruby 728: attribute has a default value of zero.</p> <!-- see bug 12288 for
729: compat reasons why .size allows zero (it's not limited to values
730: greater than zero) even though that value really makes no sense -->
1.4 mike 731:
1.1 mike 732: <p class="note">For historical reasons, the default value of the
733: <code title="dom-select-size"><a href="#dom-select-size">size</a></code> IDL attribute does not
734: 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
735: or 4 depending on the presence of the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code> attribute.</p>
736:
737: <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>
738: 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>
739: methods, are part of the <a href="constraints.html#the-constraint-validation-api">constraint validation API</a>. The
740: <code title="dom-lfe-labels"><a href="the-label-element.html#dom-lfe-labels">labels</a></code> attribute provides a list
741: 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
742: element's forms API.</p>
743:
1.85 mike 744: </div>
1.159 sruby 745: <!--TOPIC:HTML-->
1.85 mike 746:
747: <div class="example">
1.1 mike 748:
749: <p>The following example shows how a <code><a href="#the-select-element">select</a></code> element
750: can be used to offer the user with a set of options from which the
751: user can select a single option. The default option is
752: preselected.</p>
753:
754: <pre><p>
755: <label for="unittype">Select unit type:</label>
756: <select id="unittype" name="unittype">
757: <option value="1"> Miner </option>
758: <option value="2"> Puffer </option>
759: <option value="3" selected> Snipey </option>
760: <option value="4"> Max </option>
761: <option value="5"> Firebot </option>
762: </select>
763: </p></pre>
764:
765: <p>When there is no default option, a placeholder can be used
766: instead:</p>
767:
768: <pre><select name="unittype" <strong>required</strong>>
769: <strong><option value=""> Select unit type </option></strong>
770: <option value="1"> Miner </option>
771: <option value="2"> Puffer </option>
772: <option value="3"> Snipey </option>
773: <option value="4"> Max </option>
774: <option value="5"> Firebot </option>
775: </select></pre>
776:
1.85 mike 777: </div>
778:
779: <div class="example">
1.1 mike 780:
781: <p>Here, the user is offered a set of options from which he can
782: select any number. By default, all five options are selected.</p>
783:
784: <pre><p>
785: <label for="allowedunits">Select unit types to enable on this map:</label>
786: <select id="allowedunits" name="allowedunits" multiple>
787: <option value="1" selected> Miner </option>
788: <option value="2" selected> Puffer </option>
789: <option value="3" selected> Snipey </option>
790: <option value="4" selected> Max </option>
791: <option value="5" selected> Firebot </option>
792: </select>
793: </p></pre>
794:
1.85 mike 795: </div>
796:
797: <div class="example">
1.1 mike 798:
799: <p>Sometimes, a user has to select one or more items. This example
800: shows such an interface.</p>
801:
802: <pre><p>Select the songs from that you would like on your Act II Mix Tape:</p>
803: <select multiple required name="act2">
804: <option value="s1">It Sucks to Be Me (Reprise)
805: <option value="s2">There is Life Outside Your Apartment
806: <option value="s3">The More You Ruv Someone
807: <option value="s4">Schadenfreude
808: <option value="s5">I Wish I Could Go Back to College
809: <option value="s6">The Money Song
810: <option value="s7">School for Monsters
811: <option value="s8">The Money Song (Reprise)
812: <option value="s9">There's a Fine, Fine Line (Reprise)
813: <option value="s10">What Do You Do With a B.A. in English? (Reprise)
814: <option value="s11">For Now
815: </select></pre>
816:
1.85 mike 817: </div>
818:
819:
820:
821: </body></html>
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