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How to use JavaScript to achieve the left menu effect

亚连Original: 2018-06-20 17:11:132434browse

This article mainly introduces the JavaScript implementation of the left menu effect in detail. It has certain reference value. Interested friends can refer to it.

The example in this article shares with you the js implementation of the left menu. The specific code for menu effect display is for your reference. The specific content is as follows

The amount of code I have learned so far is a bit large, and future learning will make it simpler

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <style>
 .hide {
  display: none;
 }
 .item .header {
  height: 35px;
  background-color: #2459a2;
  color: white;
  line-height: 35px;
 }
 </style>
</head>
<body>
<p style="height: 48px"></p>
<p style="width: 300px">
 <p class="item">
 <p id=&#39;i1&#39; class="header" onclick="ChangeMenu(&#39;i1&#39;);">菜单1</p>
 <p class="content hide">
  <p>内容1</p>
  <p>内容1</p>
  <p>内容1</p>
 </p>
 </p>
 <p class="item">
 <p id=&#39;i2&#39; class="header" onclick="ChangeMenu(&#39;i2&#39;);">菜单2</p>
 <p class="content hide">
  <p>内容2</p>
  <p>内容2</p>
  <p>内容2</p>
 </p>
 </p>
 <p class="item">
 <p id=&#39;i3&#39; class="header" onclick="ChangeMenu(&#39;i3&#39;);">菜单3</p>
 <p class="content hide">
  <p>内容3</p>
  <p>内容3</p>
  <p>内容3</p>
 </p>
 </p>
 <p class="item">
 <p id=&#39;i4&#39; class="header" onclick="ChangeMenu(&#39;i4&#39;);">菜单4</p>
 <p class="content hide">
  <p>内容4</p>
  <p>内容4</p>
  <p>内容4</p>
 </p>
 </p>
</p>
<script>
 function ChangeMenu(nid) {
 var current_header = document.getElementById(nid);
 var item_list = current_header.parentElement.parentElement.children;
 for (var i = 0; i < item_list.length; i++) {
  var current_item = item_list[i];
  current_item.children[1].classList.add(&#39;hide&#39;);
 }
 current_header.nextElementSibling.classList.remove(&#39;hide&#39;);
 }
</script>
</body>
</html>

The effect is like this:

After clicking on any menu, it will look like this:

The above is what I compiled for everyone. I hope it will be better in the future. Helpful to everyone.

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