快速解决bootstrap下拉菜单无法隐藏的问题

2019-11-19 13:17:39

字体：大中小

来源：转载

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下拉菜单的两种实现

想必大家都知道，bootstrap为我们提供了一个下拉菜单的组件，官方也为我们提供两种使用方法

1.标签指定data-toggle

<div class="dropdown">  <button type="button" class="btn dropdown-toggle" id="dropdownMenu1" data-toggle="dropdown">主题    <span class="caret"></span>  </button>  <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">    <li role="presentation">      <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Java</a>    </li>    <li role="presentation">      <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >数据挖掘</a>    </li>    <li role="presentation">      <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >数据通信/网络</a>    </li>    <li role="presentation" class="divider"></li>    <li role="presentation">      <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >分离的链接</a>    </li>  </ul></div>

2.js调用dropdown(‘toggle')方法

<div class="dropdown">  <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="dropdown-toggle" id="dropdownMenu1" >    主题    <span class="caret"></span>  </a>  <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">    <li role="presentation">      <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Java</a>    </li>    <li role="presentation">      <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >数据挖掘</a>    </li>    <li role="presentation">      <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >数据通信/网络</a>    </li>  </ul><button id="test">test</button></div></body><script>  $(function() {    $("#test").click(function() {      $(".dropdown-toggle").dropdown('toggle');    })  })</script>

第二种方法有个很严重的问题

就是，下拉菜单开启后，官方并没有提供将它隐藏的方法，网上的方法死活说再次调用dropdown(‘toggle')。。。反正我不行。

那么我想用点击之外来开启下拉菜单呢？（必须得使用JS来控制）

我想到一个方法，使用jQuery提供的一个效果slideUp(),slideDown()

<body><div class="dropdown">  <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="dropdown-toggle" id="dropdownMenu1" >    主题    <span class="caret"></span>  </a>  <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">    <li role="presentation">      <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >Java</a>    </li>    <li role="presentation">      <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >数据挖掘</a>    </li>    <li role="presentation">      <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >数据通信/网络</a>    </li>    <li role="presentation" class="divider"></li>    <li role="presentation">      <a role="menuitem" tabindex="-1" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >分离的链接</a>    </li>  </ul><button id="test">test</button><button id="test1">test1</button></div></body><script>  $(function() {    $("#test").click(function() {      $(".dropdown-menu").slideUp();    })    $("#test1").click(function() {      $(".dropdown-menu").slideDown();    })  })</script>

好了现在能实现开和关了，但是速度有点慢？没事slide可以通过参数调节速度甚至还有回调函数来替代$(selector).on("hidden.bs.dropdown', function () {})（对下拉菜单收回时间的监听），满分！