mirror of
https://github.com/fofolee/uTools-Manuals.git
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80 lines
9.2 KiB
HTML
80 lines
9.2 KiB
HTML
<article class="" id="post-">
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<header class="entry-header">
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<h1 class="entry-title">:visible 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/visible-selector/" target="_blank">:visible 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="visible1"><h2 class="section-title"><span>visible selector</span></h2>
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<div class="entry-wrapper">
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<p class="desc"><strong>描述: </strong>选择所有可见的元素。</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( ":visible" )</h4></li></ul>
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<div class="longdesc" id="entry-longdesc">
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<p>如果元素中占据文档中一定的空间,元素被认为是可见的。可见元素的宽度或高度，是大于零。</p>
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<p>
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元素的<code>visibility: hidden</code> 或 <code>opacity: 0</code>被认为是可见的，因为他们仍然占用空间布局。</p>
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<p>
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不在文档中的元素是被认为隐藏的;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>隐藏元素上做动画，元素被认为是可见的，直到动画结束。显示元素上做动画，在动画的开始处该元素被认为是可见的。</p>
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<p>
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<code>:visible</code>的计算方法是在jQuery 1.3.2改变。
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<a href="http://docs.jquery.com/Release:jQuery_1.3.2#:visible.2F:hidden_Overhauled">发行说明</a>中列出更详细的变化。</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>:visible</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>:visible</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>:visible</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(":visible")</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">在所有可见的 div 上添加事件，当点击后变成黄色。</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 class="gutter">
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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">50</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">margin</span>:<span class="value"><span class="number">5</span>px;</span></span> <span class="rule"><span class="attribute">border</span>:<span class="value"><span class="number">3</span>px outset green;</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="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">button</span>></span>Show hidden to see they don't change<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">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">class</span>=<span class="value">"starthidden"</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><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><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><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">"div:visible"</span>).click(<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">this</span>).css(<span class="string">"background"</span>, <span class="string">"yellow"</span>);</code></div></div><div class="container"><div class="line"><code> });</code></div></div><div class="container"><div class="line"><code> $(<span class="string">"button"</span>).click(<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="string">"div:hidden"</span>).show(<span class="string">"fast"</span>);</code></div></div><div class="container"><div class="line"><code> });</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> |