而不是写一些javascript或jquery代码(重新发明轮子)。上面的场景可以通过引导自动关闭选项来管理。 你可以提供任意一个值来自动关闭:

always -(默认值)在点击任何元素时自动关闭下拉菜单。 outeclick -仅当用户单击下拉框外的任何元素时自动关闭下拉框。 Disabled -禁用自动关闭

看看下面的plunkr:

http://plnkr.co/edit/gnU8M2fqlE0GscUQtCWa?p=preview

Set

uib-dropdown auto-close="disabled" 

希望这对你有所帮助。

$(function() {
    $('.mega-dropdown').on('hide.bs.dropdown', function(e) {
        var $target = $(e.target);
        return !($target.hasClass("keep-open") || $target.parents(".keep-open").size() > 0);
    });

    $('.mega-dropdown > ul.dropdown-menu').on('mouseenter', function() {
        $(this).parent('li').addClass('keep-open')
    }).on('mouseleave', function() {
        $(this).parent('li').removeClass('keep-open')
    });
});

您可以通过下面的代码来解决这个问题。

$(document).on('click.bs.dropdown.data-api', '.keep_it_open', function (e) { e.stopPropagation(); }); <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css" rel="stylesheet"/> <meta name="viewport" content="width=device-width, initial-scale=1"> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css"> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script> <div class="dropdown keep_it_open"> <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">Dropdown Example <span class="caret"></span></button> <ul class="dropdown-menu"> <li><a href="#">HTML</a></li> <li><a href="#">CSS</a></li> <li><a href="#">JavaScript</a></li> </ul> </div>

您可以简单地执行事件。链接本身的点击事件的stopPropagation。 就像这样。

    $(".dropdown-menu a").click((event) => {
         event.stopPropagation()
         let url = event.target.href
         //Do something with the url or any other logic you wish
    })

编辑:如果有人看到这个答案，并正在使用react，它将无法工作。 React以不同的方式处理javascript事件，当你的React事件处理程序被调用时，事件已经被触发并传播。为了克服这个问题，您应该像这样手动附加事件

handleMenuClick(event) {
   event.stopPropagation()
   let menu_item = event.target
   //implement your logic here.
}
componentDidMount() {
    document.getElementsByClassName("dropdown-menu")[0].addEventListener(
        "click", this.handleMenuClick.bind(this), false)
   }
}

Bootstrap提供以下功能:

                 | This event is fired immediately when the hide instance method 
hide.bs.dropdown | has been called. The toggling anchor element is available as the 
                 | relatedTarget property of the event.

因此，实现这个函数应该能够禁止关闭下拉列表。

$('#myDropdown').on('hide.bs.dropdown', function (e) {
    var target = $(e.clickEvent.target);
    if(target.hasClass("keepopen") || target.parents(".keepopen").length){
        return false; // returning false should stop the dropdown from hiding.
    }else{
        return true;
    }
});

我修改了@Vartan的答案，使它与Bootstrap 4.3一起工作。他的解决方案不再适用于最新版本，因为目标属性总是返回下拉菜单的根div，无论单击放在哪里。

代码如下:

$('.dropdown-keep-open').on('hide.bs.dropdown', function (e) {
  if (!e.clickEvent) {
    // There is no `clickEvent` property in the `e` object when the `button` (or any other trigger) is clicked. 
    // What we usually want to happen in such situations is to hide the dropdown so we let it hide. 
    return true;
  }

  var target = $(e.clickEvent.target);

  return !(target.hasClass('dropdown-keep-open') || target.parents('.dropdown-keep-open').length);
});

<div class="dropdown dropdown-keep-open">
  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Dropdown button
  </button>
  <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
    <a class="dropdown-item" href="#">Action</a>
    <a class="dropdown-item" href="#">Another action</a>
    <a class="dropdown-item" href="#">Something else here</a>
  </div>
</div>