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How does JavaScript achieve the effect of highlighting the current menu in the navigation bar when it is selected?

黄舟Original: 2017-07-25 09:36:511572browse

This article mainly introduces the JS implementation of the highlighted navigation bar effect after selecting the current menu. It involves JavaScript traversal and style dynamic operation techniques for page elements. It has certain reference value. Friends in need can refer to it

The example of this article describes the JS implementation of the highlighted navigation bar effect after the current menu is selected. Share it with everyone for your reference. The details are as follows:

Here is a demonstration that after the current menu is selected, the menu is highlighted. That is to say, without changing the menu CSS code, JavaScript is used to control the background of the menu. If the menu item is clicked, , will give it a distinctive background color or background image, which can clearly guide the user to the website column they are browsing. This menu does not require the addition of dynamic language, it is simple, convenient and effective.

The screenshot of the running effect is as follows:

The specific code is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>选中当前菜单后高亮</title>
<style type="text/css">
<!--
.nav {
  MARGIN: 1px 0; 
  WIDTH: 100%; 
  FONT-FAMILY: verdana; 
  HEIGHT: 21px; 
  BACKGROUND-COLOR: #970B0B;
  font-family:Arial, Helvetica, sans-serif;
 font-size:12px;
}
.nav UL {
  PADDING: 0px; 
  DISPLAY: block; 
  MARGIN: 0px; 
  LIST-STYLE-TYPE: none; 
  HEIGHT: 21px; 
  BACKGROUND-COLOR: #970B0B;
  COLOR: #ffffff; 
}
.nav LI {
  BORDER-RIGHT: #ffffff 1px solid; 
  DISPLAY: block; 
  FLOAT: left; 
  HEIGHT: 21px;
  font-family:Arial, Helvetica, sans-serif;
 font-size:12px;
}
.nav LI A {
  PADDING:1px 15px 0; 
  DISPLAY: block; 
  FONT-WEIGHT: none; 
  COLOR: #ffffff; 
  LINE-HEIGHT: 20px; 
  TEXT-DECORATION: none;
}
.nav LI A:hover {
  COLOR:#562505; 
  BACKGROUND-COLOR: #f4f524; 
  TEXT-DECORATION: none;
}
.current{
 color:#ffffff;
 background:#D42524;
}
.nav li#date{
 color:#ffffff;
 PADDING:2px 15px 0; 
}
-->
</style>
<script language="javascript" type="text/javascript">
var $c=function(array){var nArray = [];for (var i=0;i<array.length;i++) nArray.push(array[i]);return nArray;};
Array.prototype.each=function(func){
for(var i=0,l=this.length;i<l;i++) {func(this[i],i);};
};
document .getElementsByClassName=function(cn){
var hasClass=function(w,Name){
var hasClass = false;
w.className.split(&#39; &#39;).each(function(s){
if (s == Name) hasClass = true;
});
return hasClass;
}; 
var elems =document.getElementsByTagName("*")||document.all;
   var elemList = [];
   $c(elems).each(function(e){
if(hasClass(e,cn)){elemList.push(e);}
   })
  return $c(elemList);
};
function change_bg(obj){
var a=document.getElementsByClassName("nav")[0].getElementsByTagName("a");
for(var i=0;i<a.length;i++){a[i].className="";}
obj.className="current";
}
</script>
</head>
<body>
<p class="nav">
 <UL>
 <LI><A href="#" onclick="change_bg(this)">脚本首页</A></LI>
 <LI><A href="#" onclick="change_bg(this)">网页特效</A> </LI>
 <LI><a href="#" class="current" onclick="change_bg(this)">精品脚本</a> </LI>
 <LI><A href="#" onclick="change_bg(this)">ASP代码</A> </LI>
 <LI><A href="#" onclick="change_bg(this)">PHP代码</A> </LI>
 <LI><A href="#" onclick="change_bg(this)">JSP代码</A> </LI>
 <LI><A href="#" onclick="change_bg(this)">脚本资源</A> </LI>
 <LI><A href="#" onclick="change_bg(this)">软件下载</A> </LI>
 </UL>
</p>
</body>
</html>

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