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快速解決bootstrap下拉菜單無法隱藏的問題

 更新時間：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，具有很好的參考價值，希望對大家有所幫助。一起跟隨小編過來看看吧

下拉菜單的兩種實現(xiàn)

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

1.標簽指定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</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</a>
    </li>
  </ul>
<button id="test">test</button>
</div>
</body>

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

第二種方法有個很嚴重的問題

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用dropdown(‘toggle')。。。反正我不行。

那么我想用點擊之外來開啟下拉菜單呢？（必須得使用JS來控制）

我想到一個方法，使用jQuery提供的一個效果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</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)在能實現(xiàn)開和關了，但是速度有點慢？沒事slide可以通過參數(shù)調節(jié)速度甚至還有回調函數(shù)來替代$(selector).on("hidden.bs.dropdown', function () {})（對下拉菜單收回時間的監(jiān)聽），滿分！

$(selector).slideUp(speed,callback)

speed 可選。規(guī)定元素從可見到隱藏的速度（或者相反）。默認為 “normal”。 可能的值：

毫秒 （比如 1500）

“slow”
“normal”
“fast”

在設置速度的情況下，元素從可見到隱藏的過程中，會逐漸地改變其高度（這樣會創(chuàng)造滑動效果）。

callback

可選。slideUp 函數(shù)執(zhí)行完之后，要執(zhí)行的函數(shù)。 除非設置了 speed 參數(shù)，否則不能設置該參數(shù)。

以上這篇快速解決bootstrap下拉菜單無法隱藏的問題就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持腳本之家。

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