Annotation of html5/spec/the-select-element.html, revision 1.124
1.88 mike 1: <!DOCTYPE html>
1.96 mike 2: <html lang="en-US-x-Hixie"><head><title>4.10.9 The select 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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1.96 mike 319: </script>
1.1 mike 320: <script src="link-fixup.js"></script>
321: <link href="the-button-element.html" title="4.10.8 The button element" rel="prev">
322: <link href="index.html#contents" title="Table of contents" rel="contents">
323: <link href="the-datalist-element.html" title="4.10.10 The datalist 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>
1.124 ! 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 1.5650.</p>
1.1 mike 329:
1.122 mike 330: <h2 class="no-num no-toc" id="editor-s-draft-7-may-2012">Editor's Draft 7 May 2012</h2>
1.85 mike 331: </div>
332:
333: <nav class="prev_next">
1.1 mike 334: <a href="the-button-element.html">← 4.10.8 The button element</a> –
335: <a href="index.html#contents">Table of contents</a> –
336: <a href="the-datalist-element.html">4.10.10 The datalist element →</a>
337: </nav>
338:
1.85 mike 339: <h4 id="the-select-element"><span class="secno">4.10.9 </span>The <dfn><code>select</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#phrasing-content">Phrasing content</a>.</dd>
344: <dd><a href="content-models.html#interactive-content">Interactive content</a>.</dd>
345: <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>
346: <dd><a href="content-models.html#palpable-content">Palpable content</a>.</dd>
1.25 mike 347: <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 348: <dd>Where <a href="content-models.html#phrasing-content">phrasing content</a> is expected.</dd>
1.25 mike 349: <dt><a href="element-definitions.html#element-dfn-content-model" title="element-dfn-content-model">Content model</a>:</dt>
1.1 mike 350: <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 351: <dt><a href="element-definitions.html#element-dfn-attributes" title="element-dfn-attributes">Content attributes</a>:</dt>
1.1 mike 352: <dd><a href="global-attributes.html#global-attributes">Global attributes</a></dd>
353: <dd><code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code></dd>
354: <dd><code title="attr-fe-disabled"><a href="attributes-common-to-form-controls.html#attr-fe-disabled">disabled</a></code></dd>
355: <dd><code title="attr-fae-form"><a href="association-of-controls-and-forms.html#attr-fae-form">form</a></code></dd>
356: <dd><code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code></dd>
357: <dd><code title="attr-fe-name"><a href="attributes-common-to-form-controls.html#attr-fe-name">name</a></code></dd>
358: <dd><code title="attr-select-required"><a href="#attr-select-required">required</a></code></dd>
359: <dd><code title="attr-select-size"><a href="#attr-select-size">size</a></code></dd>
1.25 mike 360: <dt><a href="element-definitions.html#element-dfn-dom" title="element-dfn-dom">DOM interface</a>:</dt>
1.1 mike 361: <dd>
362: <pre class="idl">interface <dfn id="htmlselectelement">HTMLSelectElement</dfn> : <a href="elements.html#htmlelement">HTMLElement</a> {
363: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-autofocus" title="dom-fe-autofocus">autofocus</a>;
364: attribute boolean <a href="attributes-common-to-form-controls.html#dom-fe-disabled" title="dom-fe-disabled">disabled</a>;
365: 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>;
366: attribute boolean <a href="#dom-select-multiple" title="dom-select-multiple">multiple</a>;
367: attribute DOMString <a href="attributes-common-to-form-controls.html#dom-fe-name" title="dom-fe-name">name</a>;
368: attribute boolean <a href="#dom-select-required" title="dom-select-required">required</a>;
369: attribute unsigned long <a href="#dom-select-size" title="dom-select-size">size</a>;
370:
371: readonly attribute DOMString <a href="#dom-select-type" title="dom-select-type">type</a>;
372:
373: readonly attribute <a href="common-dom-interfaces.html#htmloptionscollection">HTMLOptionsCollection</a> <a href="#dom-select-options" title="dom-select-options">options</a>;
374: attribute unsigned long <a href="#dom-select-length" title="dom-select-length">length</a>;
375: getter <a href="infrastructure.html#element">Element</a> <a href="#dom-select-item" title="dom-select-item">item</a>(unsigned long index);
376: object <a href="#dom-select-nameditem" title="dom-select-namedItem">namedItem</a>(DOMString name);
1.74 mike 377: 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 378: void <a href="#dom-select-remove" title="dom-select-remove">remove</a>(long index);
379: <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);
380:
381: readonly attribute <a href="infrastructure.html#htmlcollection">HTMLCollection</a> <a href="#dom-select-selectedoptions" title="dom-select-selectedOptions">selectedOptions</a>;
382: attribute long <a href="#dom-select-selectedindex" title="dom-select-selectedIndex">selectedIndex</a>;
383: attribute DOMString <a href="#dom-select-value" title="dom-select-value">value</a>;
384:
385: readonly attribute boolean <a href="constraints.html#dom-cva-willvalidate" title="dom-cva-willValidate">willValidate</a>;
386: readonly attribute <a href="constraints.html#validitystate">ValidityState</a> <a href="constraints.html#dom-cva-validity" title="dom-cva-validity">validity</a>;
387: readonly attribute DOMString <a href="constraints.html#dom-cva-validationmessage" title="dom-cva-validationMessage">validationMessage</a>;
388: boolean <a href="constraints.html#dom-cva-checkvalidatity" title="dom-cva-checkValidatity">checkValidity</a>();
389: void <a href="constraints.html#dom-cva-setcustomvalidity" title="dom-cva-setCustomValidity">setCustomValidity</a>(DOMString error);
390:
391: readonly attribute <a href="infrastructure.html#nodelist">NodeList</a> <a href="the-label-element.html#dom-lfe-labels" title="dom-lfe-labels">labels</a>;
392: };</pre>
393: </dd>
394: </dl><p>The <code><a href="#the-select-element">select</a></code> element represents a control for
1.85 mike 395: selecting amongst a set of options.</p>
396:
397: <p>The <dfn id="attr-select-multiple" title="attr-select-multiple"><code>multiple</code></dfn>
1.1 mike 398: attribute is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. If the attribute is
399: present, then the <code><a href="#the-select-element">select</a></code> element
400: <a href="rendering.html#represents">represents</a> a control for selecting zero or more options
401: from the <a href="#concept-select-option-list" title="concept-select-option-list">list of
402: options</a>. If the attribute is absent, then the
403: <code><a href="#the-select-element">select</a></code> element <a href="rendering.html#represents">represents</a> a control for
1.85 mike 404: selecting a single option from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
405:
406: <p>The <dfn id="attr-select-size" title="attr-select-size"><code>size</code></dfn>
1.1 mike 407: 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
408: have a value that is a <a href="common-microsyntaxes.html#valid-non-negative-integer">valid non-negative integer</a>
1.85 mike 409: greater than zero.</p>
410:
411: <div class="impl">
1.1 mike 412:
413: <p>The <dfn id="concept-select-size" title="concept-select-size">display size</dfn> of a
414: <code><a href="#the-select-element">select</a></code> element is the result of applying the
415: <a href="common-microsyntaxes.html#rules-for-parsing-non-negative-integers">rules for parsing non-negative integers</a> to the value of
416: element's <code title="attr-select-size"><a href="#attr-select-size">size</a></code> attribute, if
417: it has one and parsing it is successful. If applying those rules to
418: 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
419: element's <a href="#concept-select-size" title="concept-select-size">display size</a> is 4
420: if the element's <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
421: content attribute is present, and 1 otherwise.</p>
422:
1.85 mike 423: </div>
424:
425: <p>The <dfn id="concept-select-option-list" title="concept-select-option-list">list of options</dfn>
1.1 mike 426: for a <code><a href="#the-select-element">select</a></code> element consists of all the
427: <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>
428: element, and all the <code><a href="the-option-element.html#the-option-element">option</a></code> element children of all the
429: <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 430: element, in <a href="infrastructure.html#tree-order">tree order</a>.</p>
431:
432: <p>The <dfn id="attr-select-required" title="attr-select-required"><code>required</code></dfn>
1.1 mike 433: attribute is a <a href="common-microsyntaxes.html#boolean-attribute">boolean attribute</a>. When specified, the
434: user will be required to select a value before submitting the
1.85 mike 435: form.</p>
436:
437: <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 438: does not have a <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
439: attribute specified, and has a <a href="#concept-select-size" title="concept-select-size">display size</a> of 1;
440: and if the <a href="the-option-element.html#concept-option-value" title="concept-option-value">value</a> of the
441: 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>
442: element's <a href="#concept-select-option-list" title="concept-select-option-list">list of
443: options</a> (if any) is the empty string, and that
444: <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>
445: element (and not an <code><a href="the-optgroup-element.html#the-optgroup-element">optgroup</a></code> element), then that
446: <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 447: <dfn id="placeholder-label-option">placeholder label option</dfn>.</p>
448:
449: <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 450: does not have a <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
451: attribute specified, and has a <a href="#concept-select-size" title="concept-select-size">display size</a> of 1,
452: then the <code><a href="#the-select-element">select</a></code> element must have a <a href="#placeholder-label-option">placeholder
1.85 mike 453: label option</a>.</p>
454:
455: <div class="impl">
1.1 mike 456:
457: <p><strong>Constraint validation</strong>: If the element has its
458: <code title="attr-select-required"><a href="#attr-select-required">required</a></code> attribute
459: specified, and either none of the <code><a href="the-option-element.html#the-option-element">option</a></code> elements in
460: 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
461: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
462: true, or the only <code><a href="the-option-element.html#the-option-element">option</a></code> element in the
463: <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
464: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
465: true is the <a href="#placeholder-label-option">placeholder label option</a>, then the element
466: is <a href="constraints.html#suffering-from-being-missing">suffering from being missing</a>.</p>
467:
1.85 mike 468: </div>
469:
470: <div class="impl">
1.1 mike 471:
472: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
473: 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
474: should allow the user to pick an <code><a href="the-option-element.html#the-option-element">option</a></code> element in its
475: <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a> that
476: is itself not <a href="the-option-element.html#concept-option-disabled" title="concept-option-disabled">disabled</a>.
477: 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
478: through unfocusing the element after changing its value, or through
479: a <a href="commands.html#using-the-option-element-to-define-a-command" title="option-command">menu command</a>, or through any
480: other mechanism), and before the relevant user interaction event
481: is queued (e.g. before the
482: <code title="event-click"><a href="infrastructure.html#event-click">click</a></code> event), the user agent must
483: set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of the
484: 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
485: task</a> to <a href="webappapis.html#fire-a-simple-event">fire a simple event</a> that bubbles named
486: <code title="event-change">change</code> at the <code><a href="#the-select-element">select</a></code>
487: element, using the <a href="webappapis.html#user-interaction-task-source">user interaction task source</a> as the
488: task source.</p>
489:
490: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
491: attribute is absent, whenever an <code><a href="the-option-element.html#the-option-element">option</a></code> element in the
492: <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
493: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
494: 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
495: 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
496: agent must set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of all the
497: 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
498: false.</p>
499:
500: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
501: attribute is absent and the element's <a href="#concept-select-size" title="concept-select-size">display size</a> is greater than 1,
502: then the user agent should also allow the user to request that the
503: <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
504: any, be unselected. Upon this request being conveyed to the user
505: 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
506: <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of
507: 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
508: task</a> to <a href="webappapis.html#fire-a-simple-event">fire a simple event</a> that bubbles named
509: <code title="event-change">change</code> at the <code><a href="#the-select-element">select</a></code>
510: element, using the <a href="webappapis.html#user-interaction-task-source">user interaction task source</a> as the
511: task source.</p>
512:
513: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
514: attribute is absent and the element's <a href="#concept-select-size" title="concept-select-size">display size</a> is 1, then whenever
515: 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>
516: element's <a href="#concept-select-option-list" title="concept-select-option-list">list of
517: options</a> that have their <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to true,
518: the user agent must set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of the first
519: <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
520: <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
521: true.</p>
522:
523: <p>If the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
524: 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
525: 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
526: <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
527: themselves not <a href="the-option-element.html#concept-option-disabled" title="concept-option-disabled">disabled</a>
528: (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).
529: Upon the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of one or
530: more <code><a href="the-option-element.html#the-option-element">option</a></code> elements being changed by the user, and
531: 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
532: <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
533: bubbles named <code title="event-change">change</code> at the
534: <code><a href="#the-select-element">select</a></code> element, using the <a href="webappapis.html#user-interaction-task-source">user interaction task
535: source</a> as the task source.</p>
536:
537: <p>The <a href="form-submission.html#concept-form-reset-control" title="concept-form-reset-control">reset
538: algorithm</a> for <code><a href="#the-select-element">select</a></code> elements is to go through
539: 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
540: their <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a>
541: 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
542: otherwise.</p>
543:
1.85 mike 544: </div>
545:
546: <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 547: explicitly associate the <code><a href="#the-select-element">select</a></code> element with its
548: <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>
549: 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
550: the control non-interactive and to prevent its value from being
551: submitted. The <code title="attr-fe-autofocus"><a href="attributes-common-to-form-controls.html#attr-fe-autofocus">autofocus</a></code>
1.85 mike 552: attribute controls focus.</p>
553:
554:
555: <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 556:
557: <dd>
558:
559: <p>Returns "<code title="">select-multiple</code>" if the element
560: has a <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code>
561: attribute, and "<code title="">select-one</code>"
562: otherwise.</p>
563:
564: </dd>
565:
566: <dt><var title="">select</var> . <code title="dom-select-options"><a href="#dom-select-options">options</a></code></dt>
567:
568: <dd>
569:
570: <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>
571:
572: </dd>
573:
574: <dt><var title="">select</var> . <code title="dom-select-length"><a href="#dom-select-length">length</a></code> [ = <var title="">value</var> ]</dt>
575: <dd>
576: <p>Returns the number of elements in the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>.</p>
577: <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>
578: <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>
579: </dd>
580:
581: <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>
582: <dt><var title="">select</var>[<var title="">index</var>]</dt>
583: <dd>
584: <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>
585: </dd>
586:
587: <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>
588: <dd>
589: <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>
590: <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>
591: <p>Returns null if no element with that <a href="infrastructure.html#concept-id" title="concept-id">ID</a> could be found.</p>
592: </dd>
593:
594: <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>
595: <dd>
596: <p>Inserts <var title="">element</var> before the node given by <var title="">before</var>.</p>
597: <p>The <var title="">before</var> argument can be a number, in
598: which case <var title="">element</var> is inserted before the item
599: with that number, or an element from the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>, in
600: which case <var title="">element</var> is inserted before that
601: element.</p>
602: <p>If <var title="">before</var> is omitted, null, or a number out
603: of range, then <var title="">element</var> will be added at the
604: end of the list.</p>
605: <p>This method will throw a <code><a href="infrastructure.html#hierarchyrequesterror">HierarchyRequestError</a></code>
606: exception if <var title="">element</var> is an ancestor of the
607: element into which it is to be inserted.</p>
608: </dd>
609:
610: <dt><var title="">select</var> . <code title="dom-select-selectedOptions"><a href="#dom-select-selectedoptions">selectedOptions</a></code></dt>
611:
612: <dd>
613:
614: <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
615: selected.</p>
616:
617: </dd>
618:
619: <dt><var title="">select</var> . <code title="dom-select-selectedIndex"><a href="#dom-select-selectedindex">selectedIndex</a></code> [ = <var title="">value</var> ]</dt>
620:
621: <dd>
622:
623: <p>Returns the index of the first selected item, if any, or
624: −1 if there is no selected item.</p>
625:
626: <p>Can be set, to change the selection.</p>
627:
628: </dd>
629:
630: <dt><var title="">select</var> . <code title="dom-select-value"><a href="#dom-select-value">value</a></code> [ = <var title="">value</var> ]</dt>
631:
632: <dd>
633:
634: <p>Returns the <a href="attributes-common-to-form-controls.html#concept-fe-value" title="concept-fe-value">value</a> of the
635: first selected item, if any, or the empty string if there is no
636: selected item.</p>
637:
638: <p>Can be set, to change the selection.</p>
639:
640: </dd>
641:
642: </dl><div class="impl">
643:
644: <p>The <dfn id="dom-select-type" title="dom-select-type"><code>type</code></dfn> IDL
645: 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,
646: 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
647: present.</p>
648:
649: <p>The <dfn id="dom-select-options" title="dom-select-options"><code>options</code></dfn>
650: IDL attribute must return an <code><a href="common-dom-interfaces.html#htmloptionscollection">HTMLOptionsCollection</a></code>
651: rooted at the <code><a href="#the-select-element">select</a></code> node, whose filter matches the
652: elements in the <a href="#concept-select-option-list" title="concept-select-option-list">list of
653: options</a>.</p>
654:
655: <p>The <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection is
656: also mirrored on the <code><a href="#htmlselectelement">HTMLSelectElement</a></code> object. The
657: <a href="infrastructure.html#supported-property-indices">supported property indices</a> at any instant are the
658: indices supported by the object returned by the <code title="dom-select-options"><a href="#dom-select-options">options</a></code> attribute at that
659: instant.</p>
660:
661: <p>The <dfn id="dom-select-length" title="dom-select-length"><code>length</code></dfn> IDL
662: attribute must return the number of nodes <a href="infrastructure.html#represented-by-the-collection" title="represented
663: by the collection">represented</a> by the <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection. On setting, it
664: 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>
665:
666: <p>The <dfn id="dom-select-item" title="dom-select-item"><code>item(<var title="">index</var>)</code></dfn> method must return the value
667: 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
668: with the same argument.</p>
669:
670: <p>The <dfn id="dom-select-nameditem" title="dom-select-namedItem"><code>namedItem(<var title="">name</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>When the user agent is to <dfn id="dom-htmlselectelement-setter" title="dom-HTMLSelectElement-setter">set the value of a new indexed
675: property</dfn> for a given property index <var title="">index</var>
676: 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
677: indexed property</a> with the given property index <var title="">index</var> to the new value <var title="">value</var> on the
678: <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection.</p>
679:
680: <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
681: act like their namesake methods on that same <code title="dom-select-options"><a href="#dom-select-options">options</a></code> collection.</p>
682:
683: <p>The <dfn id="dom-select-selectedoptions" title="dom-select-selectedOptions"><code>selectedOptions</code></dfn>
684: IDL attribute must return an <code><a href="infrastructure.html#htmlcollection">HTMLCollection</a></code> rooted at
685: the <code><a href="#the-select-element">select</a></code> node, whose filter matches the elements in
686: the <a href="#concept-select-option-list" title="concept-select-option-list">list of options</a>
687: that have their <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
688: true.</p>
689:
690: <p>The <dfn id="dom-select-selectedindex" title="dom-select-selectedIndex"><code>selectedIndex</code></dfn>
691: 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
692: <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
693: <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,
694: if any. If there isn't one, then it must return −1.</p>
695:
696: <p>On setting, the <code title="dom-select-selectedIndex"><a href="#dom-select-selectedindex">selectedIndex</a></code> attribute must
697: set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of all the
698: <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,
699: 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
700: <a href="the-option-element.html#concept-option-index" title="concept-option-index">index</a> is the given new
701: value, if any, must have its <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
702: true.</p>
703:
704: <p>The <dfn id="dom-select-value" title="dom-select-value"><code>value</code></dfn> IDL
705: attribute, on getting, must return the <a href="the-option-element.html#concept-option-value" title="concept-option-value">value</a> of the first
706: <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
707: <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,
708: if any. If there isn't one, then it must return the empty
709: string.</p>
710:
711: <p>On setting, the <code title="dom-select-value"><a href="#dom-select-value">value</a></code>
712: attribute must set the <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> of all the
713: <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,
714: 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
715: <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
716: value, if any, must have its <a href="the-option-element.html#concept-option-selectedness" title="concept-option-selectedness">selectedness</a> set to
717: true.</p>
718:
719: <p>The <dfn id="dom-select-multiple" title="dom-select-multiple"><code>multiple</code></dfn>,
720: <dfn id="dom-select-required" title="dom-select-required"><code>required</code></dfn>, and
721: <dfn id="dom-select-size" title="dom-select-size"><code>size</code></dfn> IDL attributes
722: must <a href="common-dom-interfaces.html#reflect">reflect</a> the respective content attributes of the
723: same name. The <code title="dom-select-size"><a href="#dom-select-size">size</a></code> IDL
724: attribute has a default value of zero.</p>
1.4 mike 725:
1.1 mike 726: <p class="note">For historical reasons, the default value of the
727: <code title="dom-select-size"><a href="#dom-select-size">size</a></code> IDL attribute does not
728: 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
729: or 4 depending on the presence of the <code title="attr-select-multiple"><a href="#attr-select-multiple">multiple</a></code> attribute.</p>
730:
731: <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>
732: 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>
733: methods, are part of the <a href="constraints.html#the-constraint-validation-api">constraint validation API</a>. The
734: <code title="dom-lfe-labels"><a href="the-label-element.html#dom-lfe-labels">labels</a></code> attribute provides a list
735: 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
736: element's forms API.</p>
737:
1.85 mike 738: </div>
739:
740:
741: <div class="example">
1.1 mike 742:
743: <p>The following example shows how a <code><a href="#the-select-element">select</a></code> element
744: can be used to offer the user with a set of options from which the
745: user can select a single option. The default option is
746: preselected.</p>
747:
748: <pre><p>
749: <label for="unittype">Select unit type:</label>
750: <select id="unittype" name="unittype">
751: <option value="1"> Miner </option>
752: <option value="2"> Puffer </option>
753: <option value="3" selected> Snipey </option>
754: <option value="4"> Max </option>
755: <option value="5"> Firebot </option>
756: </select>
757: </p></pre>
758:
759: <p>When there is no default option, a placeholder can be used
760: instead:</p>
761:
762: <pre><select name="unittype" <strong>required</strong>>
763: <strong><option value=""> Select unit type </option></strong>
764: <option value="1"> Miner </option>
765: <option value="2"> Puffer </option>
766: <option value="3"> Snipey </option>
767: <option value="4"> Max </option>
768: <option value="5"> Firebot </option>
769: </select></pre>
770:
1.85 mike 771: </div>
772:
773: <div class="example">
1.1 mike 774:
775: <p>Here, the user is offered a set of options from which he can
776: select any number. By default, all five options are selected.</p>
777:
778: <pre><p>
779: <label for="allowedunits">Select unit types to enable on this map:</label>
780: <select id="allowedunits" name="allowedunits" multiple>
781: <option value="1" selected> Miner </option>
782: <option value="2" selected> Puffer </option>
783: <option value="3" selected> Snipey </option>
784: <option value="4" selected> Max </option>
785: <option value="5" selected> Firebot </option>
786: </select>
787: </p></pre>
788:
1.85 mike 789: </div>
790:
791: <div class="example">
1.1 mike 792:
793: <p>Sometimes, a user has to select one or more items. This example
794: shows such an interface.</p>
795:
796: <pre><p>Select the songs from that you would like on your Act II Mix Tape:</p>
797: <select multiple required name="act2">
798: <option value="s1">It Sucks to Be Me (Reprise)
799: <option value="s2">There is Life Outside Your Apartment
800: <option value="s3">The More You Ruv Someone
801: <option value="s4">Schadenfreude
802: <option value="s5">I Wish I Could Go Back to College
803: <option value="s6">The Money Song
804: <option value="s7">School for Monsters
805: <option value="s8">The Money Song (Reprise)
806: <option value="s9">There's a Fine, Fine Line (Reprise)
807: <option value="s10">What Do You Do With a B.A. in English? (Reprise)
808: <option value="s11">For Now
809: </select></pre>
810:
1.85 mike 811: </div>
812:
813:
814:
815: </body></html>
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