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https://github.com/fofolee/uTools-Manuals.git
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95 lines
12 KiB
HTML
95 lines
12 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">:hidden 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/jquery-selector-extensions/">jQuery 扩展</a></span><span class="category-divider"> | </span><span class="category"><a href="/category/selectors/">选择器</a> > <a href="/category/selectors/visibility-filter-selectors/">可见性过滤</a></span>
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<span class="pull-right">英文文档：<a href="https://api.jquery123.com/hidden-selector/" target="_blank">:hidden 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="hidden1"><h2 class="section-title"><span>hidden selector</span></h2>
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<div class="entry-wrapper">
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<p class="desc"><strong>描述: </strong>选择所有隐藏的元素。</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( ":hidden" )</h4></li></ul>
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<div class="longdesc" id="entry-longdesc">
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<p>元素可以被认为是隐藏的几个情况：</p>
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<ul>
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<li>他们的CSS <code>display</code>值是<code>none</code>。</li>
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<li>他们是<code>type="hidden"</code>的表单元素。</li>
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<li>它们的宽度和高度都显式设置为0。</li>
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<li>一个祖先元素是隐藏的，因此该元素是不会在页面上显示。</li>
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</ul>
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<p>元素<code>visibility: hidden</code>或<code>opacity: 0</code>被认为是可见的，因为他们仍然占据布局空间。在动画，隐藏一个元素，该元素被认为是可见的直到动画结束。</p>
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<p>不在文档中的元素是被认为是不可见的;如果当他们被插入到文档中，jQuery没有办法知道他们是否是可见的，因为元素可见性依赖于适用的样式。</p>
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<p>
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在动画显示的元素期间，动画一旦开始，该元素就被认为是可见的。
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</p>
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<p>在jQuery 1.3.2中，<code>:hidden</code>判断方式做了修改。如果他或者其任何父级元素不占据布局空间，这个元素就被认为是隐藏的。CSS的能见度属性（visibility）不影响这个选择器的判断（因此<code>$(elem).css('visibility','hidden').is(':hidden') == false</code> ）。更详细的大纲的变化:<a href="http://docs.jquery.com/Release:jQuery_1.3.2#:visible.2F:hidden_Overhauled">release notes</a>。</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>:hidden()</code> 是一个 jQuery 延伸出来的一个选择器。 并且不是的CSS规范的一部分, 使用<code>:hidden()</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<a href="/filter"><code>.filter(":hidden")</code></a>代替。
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</li>
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</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">示所有隐藏divs和统计隐藏的inputs。</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">div</span> <span class="rules">{ <span class="rule"><span class="attribute">width</span>:<span class="value"><span class="number">70</span>px;</span></span> <span class="rule"><span class="attribute">height</span>:<span class="value"><span class="number">40</span>px;</span></span> <span class="rule"><span class="attribute">background</span>:<span class="value"><span class="hexcolor">#ee77ff</span>;</span></span> <span class="rule"><span class="attribute">margin</span>:<span class="value"><span class="number">5</span>px;</span></span> <span class="rule"><span class="attribute">float</span>:<span class="value">left;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code> <span class="tag">span</span> <span class="rules">{ <span class="rule"><span class="attribute">display</span>:<span class="value">block;</span></span> <span class="rule"><span class="attribute">clear</span>:<span class="value">left;</span></span> <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="class">.starthidden</span> <span class="rules">{ <span class="rule"><span class="attribute">display</span>:<span class="value">none;</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">span</span>></span><span class="tag"></<span class="title">span</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">div</span> <span class="attribute">style</span>=<span class="value">"display:none;"</span>></span>Hider!<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><span class="tag"></<span class="title">div</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">div</span> <span class="attribute">class</span>=<span class="value">"starthidden"</span>></span>Hider!<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><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">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">"hidden"</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">"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">"hidden"</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">span</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">span</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="comment">// in some browsers :hidden includes head, title, script, etc...</span></code></div></div><div class="container"><div class="line"><code><span class="keyword">var</span> hiddenEls = $(<span class="string">"body"</span>).find(<span class="string">":hidden"</span>).not(<span class="string">"script"</span>);</code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code>$(<span class="string">"span:first"</span>).text(<span class="string">"Found "</span> + hiddenEls.length + <span class="string">" hidden elements total."</span>);</code></div></div><div class="container"><div class="line"><code>$(<span class="string">"div:hidden"</span>).show(<span class="number">3000</span>);</code></div></div><div class="container"><div class="line"><code>$(<span class="string">"span:last"</span>).text(<span class="string">"Found "</span> + $(<span class="string">"input:hidden"</span>).length + <span class="string">" hidden inputs."</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> |