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+---
+title: allowevents
+slug: Mozilla/Tech/XUL/Attribute/allowevents
+tags:
+  - XUL Attributes
+  - XUL Reference
+translation_of: Archive/Mozilla/XUL/Attribute/allowevents
+---
+<div class="noinclude"><span class="breadcrumbs xulRefAttr_breadcrumbs">« <a href="/zh-CN/docs/XUL_Reference">XUL Reference home</a></span></div>
+
+<dl>
+ <dt><code id="a-allowevents"><a href="https://developer.mozilla.org/zh-CN/docs/Mozilla/Tech/XUL/Attribute/allowevents">allowevents</a></code></dt>
+ <dd>Type:
+ <i>boolean<br>
+ </i>
+ 类型：boolean</dd>
+ <dd>If true, events are passed to children of the element. Otherwise, events are passed to the element only.<br>
+ 如果为真，事件向子元素传递。否则，事件只传递到当前元素。</dd>
+</dl>
+
+<div class="noinclude">
+<p>On <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/listitem" title="listitem">listitem</a></code> and <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/titlebar" title="titlebar">titlebar</a></code> elements, mouse events normally do not get sent to their children; instead they are retargeted to the <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/listitem" title="listitem">listitem</a></code> and <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/titlebar" title="titlebar">titlebar</a></code> element itself. This means that elements placed inside a listitem do not respond to events, and instead clicking the mouse simply selects that item within the list. By setting the allowevents attribute to <code>true</code>, this special behavior is disabled, and the events are targeted the same as other elements.<br>
+ 在 <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/listitem" title="listitem">listitem</a></code> 和 <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/titlebar" title="titlebar">titlebar</a></code> 元素中，鼠标事件通常不发送给子元素；相反它们重定向到 <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/listitem" title="listitem">listitem</a></code> 和 <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/titlebar" title="titlebar">titlebar</a></code> 元素本身。这意味着，放置在listitem内部的元素并不响应事件，而点击鼠标仅仅是选择在列表中的元素。当设置allowevents属性为真时，这种特殊的响应被禁止，事件则被定向到其他相同的元素。</p>
+
+<p>For <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/menu" title="menu">menu</a></code>, <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/menuseparator" title="menuseparator">menuseparator</a></code>, <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/menuitem" title="menuitem">menuitem</a></code> and <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/treecol" title="treecol">treecol</a></code> elements, as well as menu buttons, and the popup <code><a href="/zh-CN/docs/Mozilla/Tech/XUL/datepicker" title="datepicker">datepicker</a></code>, mouse events are also retargeted to the element itself. However, the allowevents attribute is handled in a different way. Instead, the allowevents may be set to <code>true</code> on a descendant instead. This does the same thing in that it allows events to be targeted normally, but allows this to be different for each descendant.</p>
+
+<p>This behavior is used for menus, for instance, to allow a menu button to behave as a menu when clicking on it, yet have part of the menu behave as a button. For the latter, the allowevents attribute is set to <code>true</code> to have a click on the child button receive events instead of targeting all events at the menu.</p>
+</div>
+
+<p></p>