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>

< >
  $(function() {
    $("#test").click(function() {
      $(".dropdown-toggle").dropdown('toggle');
    })
  })
</ >

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>
< >
  $(function() {
    $("#test").click(function() {
      $(".dropdown-menu").slideUp();
    })
    $("#test1").click(function() {
      $(".dropdown-menu").slideDown();
    })
  })
</ >

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！

$(selector).slideUp(speed,callback)

speed 可选。规定元素从可见到隐藏的速度（或者相反）。默认为 “normal”。 可能的值：

毫秒 （比如 1500）

“slow”
“normal”
“fast”

在设置速度的情况下，元素从可见到隐藏的过程中，会逐渐地改变其高度（这样会创造滑动效果）。

callback

可选。slideUp 函数执行完之后，要执行的函数。 除非设置了 speed 参数，否则不能设置该参数。

以上这篇快速解决bootstrap下拉菜单无法隐藏的问题就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。

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