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快速解決bootstrap下拉菜單無法隱藏的問題

更新時(shí)間：2018年08月10日 10:26:11 作者：CalicoBox

今天小編就為大家分享一篇快速解決bootstrap下拉菜單無法隱藏的問題，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。一起跟隨小編過來看看吧

下拉菜單的兩種實(shí)現(xiàn)

想必大家都知道，bootstrap為我們提供了一個(gè)下拉菜單的組件，官方也為我們提供兩種使用方法

1.標(biāo)簽指定data-toggle

<div class="dropdown">
  <button type="button" class="btn dropdown-toggle" id="dropdownMenu1" data-toggle="dropdown">主題
    <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" >數(shù)據(jù)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" >數(shù)據(jù)通信/網(wǎng)絡(luò)</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" >分離的鏈接</a>
    </li>
  </ul>
</div>

2.js調(diào)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" >
    主題
    <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" >數(shù)據(jù)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" >數(shù)據(jù)通信/網(wǎng)絡(luò)</a>
    </li>
  </ul>
<button id="test">test</button>
</div>
</body>

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

第二種方法有個(gè)很嚴(yán)重的問題

就是，下拉菜單開啟后，官方并沒有提供將它隱藏的方法，網(wǎng)上的方法死活說再次調(diào)用dropdown(‘toggle')。。。反正我不行。

那么我想用點(diǎn)擊之外來開啟下拉菜單呢？（必須得使用JS來控制）

我想到一個(gè)方法，使用jQuery提供的一個(gè)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" >
    主題
    <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" >數(shù)據(jù)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" >數(shù)據(jù)通信/網(wǎng)絡(luò)</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" >分離的鏈接</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>

好了現(xiàn)在能實(shí)現(xiàn)開和關(guān)了，但是速度有點(diǎn)慢？沒事slide可以通過參數(shù)調(diào)節(jié)速度甚至還有回調(diào)函數(shù)來替代$(selector).on("hidden.bs.dropdown', function () {})（對(duì)下拉菜單收回時(shí)間的監(jiān)聽），滿分！