With jQuery, you can achieve the fade effect of elements.
jQuery Fading method
With jQuery, you can achieve the fading effect of elements.
jQuery has the following four fade methods:
fadeIn()
fadeOut()
fadeToggle()
fadeTo()
##jQuery fadeIn() method
jQuery fadeIn() is used to fade in hidden elements.
Syntax:
$(selector).fadeIn(speed,callback);
The optional speed parameter specifies the duration of the effect. It can take the following values: "slow", "fast" or milliseconds. .
The optional callback parameter is the name of the function to be executed after fading is completed.
The following example demonstrates the fadeIn() method with different parameters:
<!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").fadeIn();
$("#div2").fadeIn("slow");
$("#div3").fadeIn(3000);
});
});
</script>
</head>
<body>
<p>以下实例演示了 fadeIn() 使用了不同参数的效果。</p>
<button>点击淡入 div 元素。</button>
<br><br>
<div id="div1" style="width:80px;height:80px;display:none;background-color:red;"></div><br>
<div id="div2" style="width:80px;height:80px;display:none;background-color:green;"></div><br>
<div id="div3" style="width:80px;height:80px;display:none;background-color:blue;"></div>
</body>
</html>Run the program to try it
jQuery fadeOut( ) Method
jQuery fadeOut() method is used to fade out visible elements.
Syntax:
$(selector).fadeOut(speed,callback);
The optional speed parameter specifies the duration of the effect. It can take the following values: "slow", "fast", or milliseconds.
The optional callback parameter is the name of the function executed after fading is completed.
The following example demonstrates the fadeOut() method with different parameters:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#div1").fadeOut();
$("#div2").fadeOut("slow");
$("#div3").fadeOut(3000);
});
});
</script>
</head>
<body>
<p>以下实例演示了 fadeOut() 使用了不同参数的效果。</p>
<button>点击淡出 div 元素。</button>
<br><br>
<div id="div1" style="width:80px;height:80px;background-color:red;"></div><br>
<div id="div2" style="width:80px;height:80px;background-color:green;"></div><br>
<div id="div3" style="width:80px;height:80px;background-color:blue;"></div>
</body>
</html>Run the program to try it
##jQuery fadeToggle( ) methodjQuery fadeToggle() method can switch between fadeIn() and fadeOut() methods.
If the element is already faded out, fadeToggle() will add a fade-in effect to the element.
If the element is already faded in, fadeToggle() will add a fade out effect to the element.
Syntax:
$(selector).fadeToggle(speed,callback);
The optional speed parameter specifies the duration of the effect. It can take the following values: "slow", "fast", or milliseconds.
The optional callback parameter is the name of the function executed after fading is completed.
The following example demonstrates the fadeToggle() method with different parameters:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>PHP中文网(php.cn)</title>
<script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#div1").fadeToggle();
$("#div2").fadeToggle("slow");
$("#div3").fadeToggle(3000);
});
});
</script>
</head>
<body>
<p>实例演示了 fadeToggle() 使用了不同的 speed(速度) 参数。</p>
<button>点击淡入/淡出</button>
<br><br>
<div id="div1" style="width:80px;height:80px;background-color:red;"></div>
<br>
<div id="div2" style="width:80px;height:80px;background-color:green;"></div>
<br>
<div id="div3" style="width:80px;height:80px;background-color:blue;"></div>
</body>
</html>Run the program to try it
##jQuery fadeTo( ) Method
#jQuery fadeTo() method allows a gradient to a given opacity (a value between 0 and 1). Syntax:
$(selector).fadeTo(speed,opacity,callback);Required speed parameter Specifies the duration of the effect. It can take the following values: "slow", "fast", or milliseconds. The required opacity parameter in the fadeTo() method sets the fade effect to the given opacity (a value between 0 and 1). The optional callback parameter is the name of the function to be executed after the function is completed. The following example demonstrates the fadeTo() method with different parameters: <!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("button").click(function(){
$("#div1").fadeTo("slow",0.15);
$("#div2").fadeTo("slow",0.4);
$("#div3").fadeTo("slow",0.7);
});
});
</script>
</head>
<body>
<p>演示 fadeTo() 使用不同参数</p>
<button>点我让颜色变淡</button>
<br><br>
<div id="div1" style="width:80px;height:80px;background-color:red;"></div><br>
<div id="div2" style="width:80px;height:80px;background-color:green;"></div><br>
<div id="div3" style="width:80px;height:80px;background-color:blue;"></div>
</body>
</html>
Run the program to try it
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