With jQuery, CSS elements can be easily manipulated. Switch CSS classes
jQuery operations CSS
jQuery has several methods for performing CSS operations. We will learn the following:
addClass() - Adds one or more classes to the selected element
removeClass() - Removes the class from the selected element Select an element to delete one or more classes
toggleClass() - Perform a switching operation of adding/deleting classes to the selected element
css( ) - Set or return style properties
jQuery addClass() method
The following example shows how Add class attributes to different elements. Of course, when adding a class, you can also select multiple elements:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1,p").addClass("blue");
$("div").addClass("important");
});
});
</script>
<style type="text/css">
.important
{
font-weight:bold;
font-size:xx-large;
}
.blue
{
color:blue;
}
</style>
</head>
<body>
<h1>标题 1</h1>
<h2>标题 2</h2>
<p>这是一个段落。</p>
<p>这是另外一个段落。</p>
<div>这是一些重要的文本!</div>
<br>
<button>为元素添加 class</button>
</body>
</html>Run the program to try it
You can also specify multiple classes in the addClass() method:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#div1").addClass("important blue");
});
});
</script>
<style type="text/css">
.important
{
font-weight:bold;
font-size:xx-large;
}
.blue
{
color:blue;
}
</style>
</head>
<body>
<div id="div1">这是一些文本。</div>
<div id="div2">这是一些文本。</div>
<br>
<button>为第一个 div 元素添加类</button>
</body>
</html>Run the program to try it
jQuery removeClass() method
The following example demonstrates how Delete the specified class attribute in different elements:
Example
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1,h2,p").removeClass("blue");
});
});
</script>
<style type="text/css">
.important
{
font-weight:bold;
font-size:xx-large;
}
.blue
{
color:blue;
}
</style>
</head>
<body>
<h1 class="blue">标题 1</h1>
<h2 class="blue">标题 2</h2>
<p class="blue">这是一个段落。</p>
<p>这是另外一个段落。</p>
<br>
<button>从元素中移除 class</button>
</body>
</html>Run the program to try it
jQuery toggleClass() method
The following example will show how to use the jQuery toggleClass() method. This method performs the switching operation of adding/deleting classes to the selected elements:
Example
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("h1,h2,p").toggleClass("blue");
});
});
</script>
<style type="text/css">
.blue
{
color:blue;
}
</style>
</head>
<body>
<h1 class="blue">标题 1</h1>
<h2 >标题 2</h2>
<p class="blue">这是一个段落。</p>
<p>这是另外一个段落。</p>
<br>
<button>切换 class</button>
</body>
</html>Run the program and try it
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