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98 lines
11 KiB
HTML
98 lines
11 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">:text 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/text-selector/" target="_blank">:text 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="text1"><h2 class="section-title"><span>text selector</span></h2>
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<div class="entry-wrapper">
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<p class="desc"><strong>描述: </strong>选择所有类型为文本的元素。</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( ":text" )</h4></li></ul>
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<div class="longdesc" id="entry-longdesc">
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<p><code>$(':text')</code>允许我们选择所有<code><input type="text"></code>元素。如同其他伪类选择器（那些以“:”开始），建议使用此类选择器时，跟在一个标签名或者其它选择器后面，否则，默认使用了全局通配符选择器 "*"。换句话说<code>$(':text')</code> 等同于 <code>$('*:text')</code>，所以应该使用<code>$('input:text')</code>来提升效率。</p>
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<p><strong>注意:</strong> 从jQuery 1.5.2开始, <code>:text</code>选择没有指定<code>type</code>属性的<code>input</code>元素（在这种情况下，<code>type="text"</code>是隐含的）。</p>
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<p>可以通过下面的例子，反映出 <code>$(':text')</code> 和 <code>$('[type=text]')</code> 之间的区别：</p>
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<div class="syntaxhighlighter javascript nogutter">
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<table>
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<tbody>
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<tr>
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<td class="gutter">
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<div class="line n1">1</div>
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</td>
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<td class="code">
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<pre><div class="container"><div class="line"><code>$(<span class="string">'<input>'</span>).is(<span class="string">'[type=text]'</span>); <span class="comment">// false</span></code></div></div><div class="container"><div class="line"><code>$(<span class="string">'<input>'</span>).is(<span class="string">':text'</span>); <span class="comment">// true</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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</div><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>:text</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>:text</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>:text</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<code>[type="text"]</code>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">查找所有的文本框。</span></h4>
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<div class="syntaxhighlighter xml ">
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<table>
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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">textarea</span> <span class="rules">{ <span class="rule"><span class="attribute">height</span>:<span class="value"><span class="number">25</span>px;</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">form</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">input</span> <span class="attribute">type</span>=<span class="value">"button"</span> <span class="attribute">value</span>=<span class="value">"Input Button"</span>/></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">input</span> <span class="attribute">type</span>=<span class="value">"checkbox"</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">input</span> <span class="attribute">type</span>=<span class="value">"file"</span> /></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">input</span> <span class="attribute">type</span>=<span class="value">"hidden"</span> /></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">input</span> <span class="attribute">type</span>=<span class="value">"image"</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">input</span> <span class="attribute">type</span>=<span class="value">"password"</span> /></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">input</span> <span class="attribute">type</span>=<span class="value">"radio"</span> /></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">input</span> <span class="attribute">type</span>=<span class="value">"reset"</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">input</span> <span class="attribute">type</span>=<span class="value">"submit"</span> /></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">input</span> <span class="attribute">type</span>=<span class="value">"text"</span> /></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">select</span>></span><span class="tag"><<span class="title">option</span>></span>Option<span class="tag"></<span class="title">option</span>></span><span class="tag"></<span class="title">select</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">textarea</span>></span><span class="tag"></<span class="title">textarea</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">button</span>></span>Button<span class="tag"></<span class="title">button</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"></<span class="title">form</span>></span></code></div></div><div class="container"><div class="line"><code> <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">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="keyword">var</span> input = $(<span class="string">"form input:text"</span>).css({background:<span class="string">"yellow"</span>, border:<span class="string">"3px red solid"</span>});</code></div></div><div class="container"><div class="line"><code>$(<span class="string">"div"</span>).text(<span class="string">"For this type jQuery found "</span> + input.length + <span class="string">"."</span>)</code></div></div><div class="container"><div class="line"><code> .css(<span class="string">"color"</span>, <span class="string">"red"</span>);</code></div></div><div class="container"><div class="line"><code>$(<span class="string">"form"</span>).submit(<span class="function"><span class="keyword">function</span> <span class="params">()</span> {</span> <span class="keyword">return</span> <span class="literal">false</span>; }); <span class="comment">// so it won't submit</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> |