避免点击里面的下拉菜单 [英] Avoid dropdown menu close on click inside

问题描述

我有一个Twitter Bootstrap下拉菜单。正如所有的Twitter Bootstrap用户所知道的那样，下拉菜单在点击时关闭（甚至点击它）。

为了避免这种情况，我可以在下拉列表中轻松附加点击事件处理程序菜单，并简单地添加着名的 event.stopPropagation（）。

 < ul class =nav navbar-nav> 
< li class =dropdown mega-dropdown> 
< a href =javascript :; class =dropdown-toggledata-toggle =dropdown> 
< i class =fa fa-list-alt>< / i>菜单项1 
< span class =fa fa-chevron-down pull-right>< / span> 
< / a> 
< ul class =dropdown-menu mega-dropdown-menu> 
< li> 
< div id =carouselclass =carousel slidedata-ride =carousel> 
 
< li data-slide-to =0data-target =＃carousel>< / li> 
< li class =activedata-slide-to =1data-target =＃carousel>< / li> 
< / ol> 
< div class =carousel-inner> 
< div class =item> 
< img alt =class =img-roundedsrc =img1.jpg> 
< / div> 
< div class =item active> 
< img alt =class =img-roundedsrc =img2.jpg> 
< / div> 
< / div> 
  class =left carousel-control> 
< span class =glyphicon glyphicon-chevron-left>< / span> 
< / a> 
  class =right carousel-control> 
< span class =glyphicon glyphicon-chevron-right>< / span> 
< / a> 
< / div> 
< / li> 
< / ul> 
< / li> 
< / ul> 
  

然而，这看起来很简单且很常见，因为 carousel-将控件（以及 carousel indicators ）事件处理程序委托给文档对象，这些元素（ prev / next 控件，...）中的点击事件将被忽略。

$（'click'，function（event）{
// $'code $（'ul.dropdown-menu.mega-dropdown-menu'）。这个事件不会传播到文档NODE和
//因此委托事件不会被触发
event.stopPropagation（）;
}）;

依靠Twitter Bootstrap下拉菜单 hide / 隐藏事件不是解决方案，原因如下：

• 事件处理程序不会为您引用单击元素
  
• 下拉菜单内容是动态生成的，因此添加标记类不是可能的

这个小提琴是正常的行为，这个小提琴与 event.stopPropagation（）添加。

更新

他的回答。我还发现了一个答案，您可以在下面找到。

解决方案

删除数据属性 data-toggle =dropdown并实现下拉的打开/关闭可以是一个解决方案。 p>

首先通过点击链接打开/关闭下拉菜单，如下所示：

 <$ c'c> $（'li.dropdown.mega-dropdown a'）。on（'click'，function（event）{
 $（this）.parent（）。toggleClass（'open'）; 
}）; 
  

，然后听取下拉外部的点击以便像这样关闭它：

$ b $（$'$'$'$ $ $'$'$'$'$'$'''。'）。（'click'，function（e）{
if（！$（'li.dropdown。 （e.target）
&& $（'li.dropdown.mega-dropdown'）。has（e.target）.length === 0
& amp ;& $（'。open'）。has（e.target）.length === 0
）{
$（'li.dropdown.mega-dropdown'）。removeClass（'open '）;
}
}）;

以下是演示：
http://jsfiddle.net/RomaLefrancois/hh81rhcm/2/

I have a Twitter Bootstrap dropdown menu. As all Twitter Bootstrap users know, the dropdown menu closes on click (even clicking inside it).

To avoid this, I can easily attach a click event handler on the dropdown menu and simply add the famous event.stopPropagation().

<ul class="nav navbar-nav">
  <li class="dropdown mega-dropdown">
    <a href="javascript:;" class="dropdown-toggle" data-toggle="dropdown">
      <i class="fa fa-list-alt"></i> Menu item 1
      <span class="fa fa-chevron-down pull-right"></span>
    </a>
    <ul class="dropdown-menu mega-dropdown-menu">
      <li>
        <div id="carousel" class="carousel slide" data-ride="carousel">
          <ol class="carousel-indicators">
            <li data-slide-to="0" data-target="#carousel"></li>
            <li class="active" data-slide-to="1" data-target="#carousel"></li>
          </ol>
          <div class="carousel-inner">
            <div class="item">
              <img alt="" class="img-rounded" src="img1.jpg">
            </div>
            <div class="item active">
              <img alt="" class="img-rounded" src="img2.jpg">
            </div>
          </div>
          <a data-slide="prev" role="button" href="#carousel" 
             class="left carousel-control">
            <span class="glyphicon glyphicon-chevron-left"></span>
          </a>
          <a data-slide="next" role="button" href="#carousel" 
             class="right carousel-control">
            <span class="glyphicon glyphicon-chevron-right"></span>
          </a>
        </div>
      </li>
    </ul>
  </li>
</ul>

This looks easy and a very common behavior, however, and since carousel-controls (as well as carousel indicators) event handlers are delegated to the document object, the click event on these elements (prev/next controls, ...) will be "ignored".

$('ul.dropdown-menu.mega-dropdown-menu').on('click', function(event){
    // The event won't be propagated up to the document NODE and 
    // therefore delegated events won't be fired
    event.stopPropagation();
});

Relying on Twitter Bootstrap dropdown hide/hidden events is not a solution for the following reasons:

• The provided event for both event handlers doesn’t give you reference to the clicked element
• The dropdown menu content is dynamically generated so adding a flag class is not possible

This fiddle is the normal behavior and this fiddle is with event.stopPropagation() added.

Update

Thanks to Roman for his answer. I also found an answer that you can find below.

解决方案

Removing the data attribute data-toggle="dropdown" and implementing the open/close of the dropdown can be a solution.

First by handling the click on the link to open/close the dropdown like this :

$('li.dropdown.mega-dropdown a').on('click', function (event) {
    $(this).parent().toggleClass('open');
});

and then listening the clicks outside of the dropdown to close it like this :

$('body').on('click', function (e) {
    if (!$('li.dropdown.mega-dropdown').is(e.target) 
        && $('li.dropdown.mega-dropdown').has(e.target).length === 0 
        && $('.open').has(e.target).length === 0
    ) {
        $('li.dropdown.mega-dropdown').removeClass('open');
    }
});

Here is the demo : http://jsfiddle.net/RomaLefrancois/hh81rhcm/2/

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