uTools-Manuals/docs/jQuery/scroll.html

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<h1 class="entry-title">.scroll()</h1>
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						所属分类：<span class="category"><a href="/category/events/">事件</a> &gt; <a href="/category/events/browser-events/">浏览器事件</a></span>
<span class="pull-right">英文文档：<a href="https://api.jquery123.com/scroll/" target="_blank">.scroll()</a></span>
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<span class="name">.scroll( handler(eventObject) )</span><span class="returns">返回: <a href="/Types/#jQuery">jQuery</a></span>
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<p class="desc"><strong>描述: </strong>为 JavaScript 的 "scroll" 事件绑定一个处理函数，或者触发元素上的该事件。</p>
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<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>.scroll( handler(eventObject) )</h4>
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<div><strong>handler(eventObject)</strong></div>
<div>类型: <a href="/Types/#Function">Function</a>()</div>
<div>每次事件触发时会执行的函数。</div>
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<span class="version-details">添加的版本: <a href="/category/version/1.4.3/">1.4.3</a></span>.scroll(  [eventData ], handler(eventObject) )</h4>
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<div><strong>eventData</strong></div>
<div>类型: <a href="/Types/#PlainObject">PlainObject</a>
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<div>一个对象，它包含的数据键值对映射将被传递给事件处理程序。</div>
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<div><strong>handler(eventObject)</strong></div>
<div>类型: <a href="/Types/#Function">Function</a>()</div>
<div>每次事件触发时会执行的函数。</div>
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<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>.scroll()</h4>
<ul><li><div class="null-signature">这个方法不接受任何参数。</div></li></ul>
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<p>这个函数的前两个用法是 <code>.bind('scroll', handler)</code> 的快捷方式，第3个不带参数的用法是 <code>.trigger('scroll')</code> 的快捷方式。</p>
<p>当用户在元素内执行了滚动操作，就会在这个元素上触发<code>scroll</code>事件。它适用于<code>window</code>对象，但也可以是可滚动frames与CSS <code>overflow</code>属性设置为<code>scroll</code>的元素（或<code>auto</code>时，元素的显示高度小于其内容高度）。</p>
<p>举例来说，请看下面的HTML：</p>
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<pre><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">div</span> <span class="attribute">id</span>=<span class="value">"target"</span> <span class="attribute">style</span>=<span class="value">"overflow: scroll; width: 200px; height: 100px;"</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  Lorem ipsum dolor sit amet, consectetur adipisicing elit,</code></div></div><div class="container"><div class="line"><code>  sed do eiusmod tempor incididunt ut labore et dolore magna</code></div></div><div class="container"><div class="line"><code>  aliqua. Ut enim ad minim veniam, quis nostrud exercitation</code></div></div><div class="container"><div class="line"><code>  ullamco laboris nisi ut aliquip ex ea commodo consequat.</code></div></div><div class="container"><div class="line"><code>  Duis aute irure dolor in reprehenderit in voluptate velit</code></div></div><div class="container"><div class="line"><code>  esse cillum dolore eu fugiat nulla pariatur. Excepteur</code></div></div><div class="container"><div class="line"><code>  sint occaecat cupidatat non proident, sunt in culpa qui</code></div></div><div class="container"><div class="line"><code>  officia deserunt mollit anim id est laborum.</code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">div</span> <span class="attribute">id</span>=<span class="value">"other"</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  Trigger the handler</code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">div</span> <span class="attribute">id</span>=<span class="value">"log"</span>&gt;</span><span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div></pre>
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<p>通过样式定义，使目标元素足够小以至它可以滚动：</p>
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<img alt="" data-pinimg="registered" src="/resources/0042_05_11.png"/>
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<p><code>scroll</code>事件处理函数可以绑定到这个元素：</p>
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<div class="line n1">1</div>
<div class="line n2">2</div>
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<pre><div class="container"><div class="line"><code>$(<span class="string">'#target'</span>).scroll(<span class="keyword">function</span>() {</code></div></div><div class="container"><div class="line"><code>  $(<span class="string">'#log'</span>).append(<span class="string">'&lt;div&gt;Handler for .scroll() called.&lt;/div&gt;'</span>);</code></div></div><div class="container"><div class="line"><code>});</code></div></div></pre>
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<p>现在，当用户向上或向下滚动文本时，从而向 <code>&lt;div id="log"&gt;&lt;/div&gt;</code> 中追加了如下信息：：</p>
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<span class="output">Handler for .scroll() called.</span>
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<p>我们可以调用不带参数的 <code>.scroll()</code> 方法，手动触发这个事件：</p>
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<div class="line n1">1</div>
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<pre><div class="container"><div class="line"><code>$(<span class="string">'#other'</span>).click(<span class="keyword">function</span>() {</code></div></div><div class="container"><div class="line"><code>  $(<span class="string">'#target'</span>).scroll();</code></div></div><div class="container"><div class="line"><code>});</code></div></div></pre>
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<p>这些代码执行后，点击 <span class="output">Trigger the handler</span> 同样警报显示。</p>
<p>每当元素的滚动位置的变化时，该元素就会触发<code>scroll</code>事件，不管什么原因。鼠标点击或拖动滚动条，拖动里面的元素，按箭头键，或使用鼠标的滚轮都可能导致触发此事件。</p>
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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">
<h4><span class="desc">在页面滚动时触发一系列动作：</span></h4>
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<pre><div class="container"><div class="line"><code><span class="doctype">&lt;!DOCTYPE html&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">html</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">head</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">style</span>&gt;</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">blue;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">p</span> <span class="rules">{ <span class="rule"><span class="attribute">color</span>:<span class="value">green;</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">color</span>:<span class="value">red;</span></span> <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">&lt;/<span class="title">style</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">script</span> <span class="attribute">src</span>=<span class="value">"https://code.jquery.com/jquery-latest.js"</span>&gt;</span><span class="javascript"></span><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">head</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">body</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">div</span>&gt;</span>Try scrolling the iframe.<span class="tag">&lt;/<span class="title">div</span>&gt;</span></code></div></div><div class="container"><div class="line"><code>  <span class="tag">&lt;<span class="title">p</span>&gt;</span>Paragraph - <span class="tag">&lt;<span class="title">span</span>&gt;</span>Scroll happened!<span class="tag">&lt;/<span class="title">span</span>&gt;</span><span class="tag">&lt;/<span class="title">p</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;<span class="title">script</span>&gt;</span><span class="javascript"></span></code></div></div><div class="container"><div class="line"><code>$(<span class="string">"p"</span>).clone().appendTo(document.body);</code></div></div><div class="container"><div class="line"><code>$(<span class="string">"p"</span>).clone().appendTo(document.body);</code></div></div><div class="container"><div class="line"><code>$(<span class="string">"p"</span>).clone().appendTo(document.body);</code></div></div><div class="container"><div class="line"><code>$(window).scroll(<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">"span"</span>).css(<span class="string">"display"</span>, <span class="string">"inline"</span>).fadeOut(<span class="string">"slow"</span>);</code></div></div><div class="container"><div class="line"><code>});</code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">script</span>&gt;</span></code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">body</span>&gt;</span></code></div></div><div class="container"><div class="line"><code><span class="tag">&lt;/<span class="title">html</span>&gt;</span></code></div></div></pre>
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<h4>Demo:</h4>
<div class="demo code-demo"></div>
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