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76 lines
8.8 KiB
HTML
76 lines
8.8 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">:selected Selector</h1>
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<div class="entry-meta">
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所属分类：<span class="category"><a href="/category/selectors/">选择器</a> > <a href="/category/selectors/form-selectors/">表单</a></span><span class="category-divider"> | </span><span class="category"><a href="/category/selectors/">选择器</a> > <a href="/category/selectors/jquery-selector-extensions/">jQuery 扩展</a></span>
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<span class="pull-right">英文文档：<a href="https://api.jquery123.com/selected-selector/" target="_blank">:selected Selector</a></span>
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</div><!-- .entry-meta -->
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</header><!-- .entry-header -->
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<!-- .entry-header -->
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<div class="entry-content">
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<article class="entry selector" id="selected1"><h2 class="section-title"><span>selected selector</span></h2>
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<div class="entry-wrapper">
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<p class="desc"><strong>描述: </strong>获取 select 元素中所有被选中的元素。</p>
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<ul class="signatures"><li class="signature"><h4 class="name">
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<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>jQuery( ":selected" )</h4></li></ul>
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<div class="longdesc" id="entry-longdesc">
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<p><code>:selected</code> 选择器只为适用于为<code><option></code>元素。它不适用复选框和单选框，复选框和单选框请使用<code>:checked</code>。</p>
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</div>
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<h3>Additional Notes（其他注意事项）:</h3>
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<div class="longdesc"><ul>
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<li>
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因为<code>:selected</code> 是一个 jQuery 延伸出来的选择器，并不是的CSS规范的一部分，使用<code>:selected</code> 查询不能充分利用原生DOM提供的<code>querySelectorAll()</code> 方法来提高性能。为了当使用<code>:selected</code> 的时候在现代浏览器上获得更佳的性能，首先使用纯CSS选择器选择元素，然后使用<a href="/filter"><code>.filter(":selected")</code></a>代替.
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</li></ul></div>
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<section class="entry-examples" id="entry-examples"><header><h2 class="underline">例子:</h2></header><div class="entry-example" id="example-0">
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<h4><span class="desc">在 select 元素上添加 change 事件，将选中的 option 元素的文本写入一个 div 中。</span></h4>
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<div class="syntaxhighlighter xml ">
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<table>
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<tbody>
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<tr>
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</td>
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<td class="code">
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<pre><div class="container"><div class="line"><code><span class="doctype"><!DOCTYPE html></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">html</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">head</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">style</span>></span><span class="css"></span></code></div></div><div class="container"><div class="line"><code> <span class="tag">div</span> <span class="rules">{ <span class="rule"><span class="attribute">color</span>:<span class="value">red;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">style</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">script</span> <span class="attribute">src</span>=<span class="value">"https://code.jquery.com/jquery-latest.js"</span>></span><span class="javascript"></span><span class="tag"></<span class="title">script</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">head</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">body</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">select</span> <span class="attribute">name</span>=<span class="value">"garden"</span> <span class="attribute">multiple</span>=<span class="value">"multiple"</span>></span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">option</span>></span>Flowers<span class="tag"></<span class="title">option</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">option</span> <span class="attribute">selected</span>=<span class="value">"selected"</span>></span>Shrubs<span class="tag"></<span class="title">option</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">option</span>></span>Trees<span class="tag"></<span class="title">option</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">option</span> <span class="attribute">selected</span>=<span class="value">"selected"</span>></span>Bushes<span class="tag"></<span class="title">option</span>></span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">option</span>></span>Grass<span class="tag"></<span class="title">option</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">option</span>></span>Dirt<span class="tag"></<span class="title">option</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">select</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">div</span>></span><span class="tag"></<span class="title">div</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">script</span>></span><span class="javascript"></span></code></div></div><div class="container"><div class="line"><code>$(<span class="string">"select"</span>).change(<span class="function"><span class="keyword">function</span> <span class="params">()</span> {</span></code></div></div><div class="container"><div class="line"><code> <span class="keyword">var</span> str = <span class="string">""</span>;</code></div></div><div class="container"><div class="line"><code> $(<span class="string">"select option:selected"</span>).each(<span class="function"><span class="keyword">function</span> <span class="params">()</span> {</span></code></div></div><div class="container"><div class="line"><code> str += $(<span class="keyword">this</span>).text() + <span class="string">" "</span>;</code></div></div><div class="container"><div class="line"><code> });</code></div></div><div class="container"><div class="line"><code> $(<span class="string">"div"</span>).text(str);</code></div></div><div class="container"><div class="line"><code>})</code></div></div><div class="container"><div class="line"><code>.trigger(<span class="string">'change'</span>);</code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">script</span>></span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">body</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"></<span class="title">html</span>></span></code></div></div></pre>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<h4>Demo:</h4>
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<div class="demo code-demo"></div>
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</div></section>
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</div></article> </div>
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</article> |