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---
title: show
slug: Web/API/Element/show_event
translation_of: Web/API/Element/show_event
---
<p>当一个具有contextmenu属性的元素的contextmenu事件触发或冒泡到该元素时,show事件会被触发。</p>

<h2 id="基本信息">基本信息</h2>

<dl>
 <dt style="float: left; text-align: right; width: 120px;">标准</dt>
 <dd style="margin: 0 0 0 120px;"><a class="external" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/interactive-elements.html#context-menus">HTML5</a></dd>
 <dt style="float: left; text-align: right; width: 120px;">接口</dt>
 <dd style="margin: 0 0 0 120px;">Event</dd>
 <dt style="float: left; text-align: right; width: 120px;">冒泡</dt>
 <dd style="margin: 0 0 0 120px;"></dd>
 <dt style="float: left; text-align: right; width: 120px;">可关闭</dt>
 <dd style="margin: 0 0 0 120px;"></dd>
 <dt style="float: left; text-align: right; width: 120px;">触发对象</dt>
 <dd style="margin: 0 0 0 120px;">Element</dd>
 <dt style="float: left; text-align: right; width: 120px;">默认动作</dt>
 <dd style="margin: 0 0 0 120px;">显示由相关目录元素创建的上下文目录</dd>
</dl>

<h2 id="属性">属性</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">属性</th>
   <th scope="col">类型</th>
   <th scope="col">描述</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td><code>target</code> {{readonlyInline}}</td>
   <td>{{domxref("EventTarget")}}</td>
   <td>事件的目标对象 (DOM树中的最高层元素)。</td>
  </tr>
  <tr>
   <td><code>type</code> {{readonlyInline}}</td>
   <td>{{domxref("DOMString")}}</td>
   <td>事件类型。</td>
  </tr>
  <tr>
   <td><code>bubbles</code> {{readonlyInline}}</td>
   <td>{{jsxref("Boolean")}}</td>
   <td>事件是否冒泡。</td>
  </tr>
  <tr>
   <td><code>cancelable</code> {{readonlyInline}}</td>
   <td>{{jsxref("Boolean")}}</td>
   <td>事件是否可以关闭。</td>
  </tr>
 </tbody>
</table>

<h2 id="例子">例子</h2>

<pre class="brush:html;">&lt;div contextmenu="test"&gt;&lt;/div&gt;
&lt;menu type="context" id="test"&gt;
    &lt;menuitem label="alert" onclick="alert('the alert label has been clicked')" /&gt;
&lt;/menu&gt;

&lt;script&gt;
  document.getElementById("test").addEventListener("show", function(e){
    alert("the context menu will be displayed");
  }, false);
&lt;/script&gt;
</pre>

<h2 id="相关事件">相关事件</h2>

<ul>
 <li><a href="https://developer.mozilla.org/en-US/Mozilla_event_reference/contextmenu"><code>contextmenu</code></a></li>
</ul>