mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-08 23:14:06 +08:00
182 lines
16 KiB
HTML
182 lines
16 KiB
HTML
<article class="" id="post-">
|
||
<header class="entry-header">
|
||
<h1 class="entry-title">.keyup()</h1>
|
||
<div class="entry-meta">
|
||
所属分类:<span class="category"><a href="/category/events/">事件</a> > <a href="/category/events/keyboard-events/">键盘事件</a></span>
|
||
<span class="pull-right">英文文档:<a href="https://api.jquery123.com/keyup/" target="_blank">.keyup()</a></span>
|
||
</div><!-- .entry-meta -->
|
||
</header><!-- .entry-header -->
|
||
<!-- .entry-header -->
|
||
<div class="entry-content">
|
||
<article class="entry method" id="keyup1"><h2 class="section-title">
|
||
<span class="name">.keyup( handler(eventObject) )</span><span class="returns">返回: <a href="/Types/#jQuery">jQuery</a></span>
|
||
</h2>
|
||
<div class="entry-wrapper">
|
||
<p class="desc"><strong>描述: </strong>为 "keyup" 事件绑定一个处理函数,或者触发元素上的 "keyup" 事件。</p>
|
||
<ul class="signatures">
|
||
<li class="signature" id="keyup-handlereventObject">
|
||
<h4 class="name">
|
||
<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>.keyup( handler(eventObject) )</h4>
|
||
<ul><li>
|
||
<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>
|
||
</li></ul>
|
||
</li>
|
||
<li class="signature" id="keyup-eventData-handlereventObject">
|
||
<h4 class="name">
|
||
<span class="version-details">添加的版本: <a href="/category/version/1.4.3/">1.4.3</a></span>.keyup( [eventData ], handler(eventObject) )</h4>
|
||
<ul>
|
||
<li>
|
||
<div><strong>eventData</strong></div>
|
||
<div>类型: <a href="/Types/#PlainObject">PlainObject</a>
|
||
</div>
|
||
<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>
|
||
</li>
|
||
<li>
|
||
<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>
|
||
</li>
|
||
</ul>
|
||
</li>
|
||
<li class="signature" id="keyup">
|
||
<h4 class="name">
|
||
<span class="version-details">添加的版本: <a href="/category/version/1.0/">1.0</a></span>.keyup()</h4>
|
||
<ul><li><div class="null-signature">这个方法不接受任何参数。</div></li></ul>
|
||
</li>
|
||
</ul>
|
||
<div class="longdesc" id="entry-longdesc">
|
||
<p>这个方法的前两个用法是 <code>.bind('keyup', handler)</code> 的快捷方式,第3个不带参数的用法是 <code>.trigger('keyup')</code> 的快捷方式。</p>
|
||
<p>当用户在一个元素上释放按键的时候,<code>keyup</code>事件就会被附加到这个元素。它可以绑定到任何元素,但该事件只是发送到获取焦点的元素上。不同的浏览器中,可获得焦点的元素略有不同,但是表单元素总是能获取焦点,所以对于此事件类型表单元素是最合适的。</p>
|
||
<p>举个例子,看下面的代码</p>
|
||
<div class="syntaxhighlighter xml nogutter">
|
||
<table>
|
||
<tbody>
|
||
<tr>
|
||
<td class="gutter">
|
||
<div class="line n1">1</div>
|
||
<div class="line n2">2</div>
|
||
<div class="line n3">3</div>
|
||
<div class="line n4">4</div>
|
||
<div class="line n5">5</div>
|
||
<div class="line n6">6</div>
|
||
</td>
|
||
<td class="code">
|
||
<pre><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">id</span>=<span class="value">"target"</span> <span class="attribute">type</span>=<span class="value">"text"</span> <span class="attribute">value</span>=<span class="value">"Hello there"</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 class="attribute">id</span>=<span class="value">"other"</span>></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"></<span class="title">div</span>></span></code></div></div></pre>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
<p>事件处理函数可以绑定在输入框上:</p>
|
||
<div class="syntaxhighlighter javascript nogutter">
|
||
<table>
|
||
<tbody>
|
||
<tr>
|
||
<td class="gutter">
|
||
<div class="line n1">1</div>
|
||
<div class="line n2">2</div>
|
||
<div class="line n3">3</div>
|
||
</td>
|
||
<td class="code">
|
||
<pre><div class="container"><div class="line"><code>$(<span class="string">'#target'</span>).keyup(<span class="keyword">function</span>() {</code></div></div><div class="container"><div class="line"><code> alert(<span class="string">'Handler for .keyup() called.'</span>);</code></div></div><div class="container"><div class="line"><code>});</code></div></div></pre>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
<p>现在当光标插入点位于表单域并一个键被按下并且释放时,警告将被显示:</p>
|
||
<p>
|
||
<span class="output">Handler for .keyup() called.</span>
|
||
</p>
|
||
<p>应用不带参数的<code>.keyup()</code>,我们可以手动触发这个事件:</p>
|
||
<div class="syntaxhighlighter javascript nogutter">
|
||
<table>
|
||
<tbody>
|
||
<tr>
|
||
<td class="gutter">
|
||
<div class="line n1">1</div>
|
||
<div class="line n2">2</div>
|
||
<div class="line n3">3</div>
|
||
</td>
|
||
<td class="code">
|
||
<pre><div class="container"><div class="line"><code>$(<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>).keyup();</code></div></div><div class="container"><div class="line"><code>});</code></div></div></pre>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
<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>如果需要任何按键被捕获(例如,要实现网页全局上的快捷键),那么把这个事件附加到<code>document</code>对象上是非常有用的。所有的按键事件都会沿着各自的 DOM 树冒泡到 <code>document</code> 对象上,除非明确停止。</p>
|
||
<p>要确定哪个键被按下,我们可以检测传递给处理函数的<a href="/category/events/event-object/">event 对象</a>。而浏览器使用不同的属性来存储这些信息,jQuery的规范了<code>.which</code>属性,以便我们能够可靠地使用它来检索关键代码。此代码对应一个键盘上的按键,包括像方向键这种特殊键的代码,如果要捕获实际输入文本, <code>.keypress()</code>可能是一个更好的选择。</p>
|
||
</div>
|
||
<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">当在文本框中松开一个按键时,显示 keyup 事件的 event 对象。(使用一个简单的 $.print 插件)。</span></h4>
|
||
<div class="syntaxhighlighter xml ">
|
||
<table>
|
||
<tbody>
|
||
<tr>
|
||
<td class="gutter">
|
||
<div class="line n1">1</div>
|
||
<div class="line n2">2</div>
|
||
<div class="line n3">3</div>
|
||
<div class="line n4">4</div>
|
||
<div class="line n5">5</div>
|
||
<div class="line n6">6</div>
|
||
<div class="line n7">7</div>
|
||
<div class="line n8">8</div>
|
||
<div class="line n9">9</div>
|
||
<div class="line n10">10</div>
|
||
<div class="line n11">11</div>
|
||
<div class="line n12">12</div>
|
||
<div class="line n13">13</div>
|
||
<div class="line n14">14</div>
|
||
<div class="line n15">15</div>
|
||
<div class="line n16">16</div>
|
||
<div class="line n17">17</div>
|
||
<div class="line n18">18</div>
|
||
<div class="line n19">19</div>
|
||
<div class="line n20">20</div>
|
||
<div class="line n21">21</div>
|
||
<div class="line n22">22</div>
|
||
<div class="line n23">23</div>
|
||
<div class="line n24">24</div>
|
||
<div class="line n25">25</div>
|
||
<div class="line n26">26</div>
|
||
<div class="line n27">27</div>
|
||
<div class="line n28">28</div>
|
||
<div class="line n29">29</div>
|
||
<div class="line n30">30</div>
|
||
<div class="line n31">31</div>
|
||
<div class="line n32">32</div>
|
||
<div class="line n33">33</div>
|
||
<div class="line n34">34</div>
|
||
<div class="line n35">35</div>
|
||
<div class="line n36">36</div>
|
||
<div class="line n37">37</div>
|
||
<div class="line n38">38</div>
|
||
<div class="line n39">39</div>
|
||
<div class="line n40">40</div>
|
||
<div class="line n41">41</div>
|
||
<div class="line n42">42</div>
|
||
<div class="line n43">43</div>
|
||
<div class="line n44">44</div>
|
||
<div class="line n45">45</div>
|
||
<div class="line n46">46</div>
|
||
<div class="line n47">47</div>
|
||
<div class="line n48">48</div>
|
||
<div class="line n49">49</div>
|
||
</td>
|
||
<td class="code">
|
||
<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">fieldset</span> <span class="rules">{ <span class="rule"><span class="attribute">margin-bottom</span>:<span class="value"> <span class="number">1</span>em;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code><span class="tag">input</span> <span class="rules">{ <span class="rule"><span class="attribute">display</span>:<span class="value"> block;</span></span> <span class="rule"><span class="attribute">margin-bottom</span>:<span class="value"> .<span class="number">25</span>em;</span></span> <span class="rule">}</span></span></code></div></div><div class="container"><div class="line"><code><span class="id">#print-output</span> <span class="rules">{</span></code></div></div><div class="container"><div class="line"><code> <span class="rule"><span class="attribute">width</span>:<span class="value"> <span class="number">100</span>%;</span></span></code></div></div><div class="container"><div class="line"><code><span class="rule">}</span></code></div></div><div class="container"><div class="line"><code><span class="class">.print-output-line</span> <span class="rules">{</span></code></div></div><div class="container"><div class="line"><code> <span class="rule"><span class="attribute">white-space</span>:<span class="value"> pre;</span></span></code></div></div><div class="container"><div class="line"><code> <span class="rule"><span class="attribute">padding</span>:<span class="value"> <span class="number">5</span>px;</span></span></code></div></div><div class="container"><div class="line"><code> <span class="rule"><span class="attribute">font-family</span>:<span class="value"> monaco, monospace;</span></span></code></div></div><div class="container"><div class="line"><code> <span class="rule"><span class="attribute">font-size</span>:<span class="value"> .<span class="number">7</span>em;</span></span></code></div></div><div class="container"><div class="line"><code><span class="rule">}</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">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">fieldset</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">label</span> <span class="attribute">for</span>=<span class="value">"target"</span>></span>Type Something:<span class="tag"></<span class="title">label</span>></span></code></div></div><div class="container"><div class="line"><code> <span class="tag"><<span class="title">input</span> <span class="attribute">id</span>=<span class="value">"target"</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">fieldset</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">button</span> <span class="attribute">id</span>=<span class="value">"other"</span>></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"></<span class="title">button</span>></span></code></div></div><div class="container"><div class="line"><code><span class="tag"><<span class="title">script</span> <span class="attribute">type</span>=<span class="value">"text/javascript"</span> <span class="attribute">src</span>=<span class="value">"/resources/events.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">script</span>></span><span class="javascript"></span></code></div></div><div class="container"><div class="line"><code><span class="keyword">var</span> xTriggered = <span class="number">0</span>;</code></div></div><div class="container"><div class="line"><code>$(<span class="string">'#target'</span>).keyup(<span class="keyword">function</span>(event) {</code></div></div><div class="container"><div class="line"><code> xTriggered++;</code></div></div><div class="container"><div class="line"><code> <span class="keyword">var</span> msg = <span class="string">'Handler for .keyup() called '</span> + xTriggered + <span class="string">' time(s).'</span>;</code></div></div><div class="container"><div class="line"><code> $.print(msg, <span class="string">'html'</span>);</code></div></div><div class="container"><div class="line"><code> $.print(event);</code></div></div><div class="container"><div class="line"><code>}).keydown(<span class="keyword">function</span>(event) {</code></div></div><div class="container"><div class="line"><code> <span class="keyword">if</span> (event.which == <span class="number">13</span>) {</code></div></div><div class="container"><div class="line"><code> event.preventDefault();</code></div></div><div class="container"><div class="line"><code> }</code></div></div><div class="container"><div class="line"><code>});</code></div></div><div class="container"><div class="line"><code> </code></div></div><div class="container"><div class="line"><code>$(<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>).keyup();</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>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
<h4>Demo:</h4>
|
||
<div class="demo code-demo" data-height="460"></div>
|
||
</div></section>
|
||
</div></article> </div>
|
||
</article> |