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https://github.com/fofolee/uTools-Manuals.git
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84 lines
10 KiB
HTML
84 lines
10 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">:file 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/file-selector/" target="_blank">:file 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="file1"><h2 class="section-title"><span>file selector</span></h2>
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<div class="entry-wrapper">
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<p class="desc"><strong>描述: </strong>选择所有类型为文件（file）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( ":file" )</h4></li></ul>
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<div class="longdesc" id="entry-longdesc">
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<p><code>:file</code> 等价于 <code>[type="file"]</code>。如同其他伪类选择器（那些以“:”开始）一样，建议前面加上一个标记名称或其他选择器;否则，通用选择("*")被默认使用。换句话说<code>$(':file')</code> 等同于 <code>$('*:file')</code>，所以应该使用<code>$('input:file')</code>。 </p>
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</div>
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<h3>Additional Notes:</h3>
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<div class="longdesc"><ul>
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<li>
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因为 <code>:file()</code> 是一个 jQuery 延伸出来的选择器 。并且不是的CSS规范的一部分, 使用<code>:file()</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。为了在现代浏览器上获得更佳的性能，请使用<code>[type="file"]</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">Finds all file inputs.</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">textarea</span> <span class="rules">{ <span class="rule"><span class="attribute">height</span>:<span class="value"><span class="number">45</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> </code></div></div><div class="container"><div class="line"><code> <span class="keyword">var</span> input = $(<span class="string">"input:file"</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> </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> |