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jQuery selector: detailed use case of parent

Jun 23, 2017 am 11:31 AM

jquery parent use Case Selector

:The definition and usage of the parent selector:

This selector matches elements that contain child elements or text.
Note: Spaces are also considered contained elements.

Grammar structure:

1	`$(":parent")`

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This selector is generally used in conjunction with other selectors, such as Class selector and Element selector, etc. wait. For example:

1	`$("div:parent").animate({width:"300px"})`

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The above code can set the width of a div containing text or elements to 300px.
If not used with other selectors, the default state is to be used with the * selector, for example, $(":parent") is equivalent to $("*:parent").

Example code:

Example 1:

<!DOCTYPE html> 
<html> 
<head> 
<meta charset=" utf-8"> 
<meta name="author" content="http://www.softwhy.com/" /> 
<title>蚂蚁部落</title> 
<style type="text/css"> 
div{ 
list-style-type:none; 
width:150px; 
height:30px; 
border:1px solid red; 
} 
</style> 
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script> 
<script type="text/javascript"> 
$(document).ready(function(){ 
$("button").click(function(){ 
$(&quot;div:parent&quot;).animate({width:&quot;300px&quot;}) 
}) 
}) 
</script> 
</head> 
<body> 
<div>我是文本</div> 
<div></div> 
<button>点击查看效果</button> 
</body> 
</html>

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The above code can set the width of a div containing text or elements to 300 in a custom animation.

Example 2:

&lt;!DOCTYPE html&gt; 
&lt;html&gt; 
&lt;head&gt; 
&lt;meta charset=&quot; utf-8&quot;&gt; 
&lt;meta name=&quot;author&quot; content=&quot;http://www.softwhy.com/&quot; /&gt; 
&lt;title&gt;蚂蚁部落&lt;/title&gt; 
&lt;style type=&quot;text/css&quot;&gt; 
div{ 
list-style-type:none; 
width:150px; 
height:30px; 
border:1px solid red; 
} 
span{border:1px solid green;} 
&lt;/style&gt; 
&lt;script type=&quot;text/javascript&quot; src=&quot;mytest/jQuery/jquery-1.8.3.js&quot;&gt;&lt;/script&gt; 
&lt;script type=&quot;text/javascript&quot;&gt; 
$(document).ready(function(){ 
$(&quot;button&quot;).click(function(){ 
$(&quot;*:parent&quot;).animate({width:&quot;300px&quot;}) 
}) 
}) 
&lt;/script&gt; 
&lt;/head&gt; 
&lt;body&gt; 
&lt;div&gt;我是文本&lt;/div&gt; 
&lt;div&gt;&lt;/div&gt; 
&lt;span&gt;大家好&lt;/span&gt; 
&lt;button&gt;点击查看效果&lt;/button&gt; 
&lt;/body&gt; 
&lt;/html&gt;

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Since the above code does not specify a selector to be used with the :parent selector, it is used with the * selector by default, so the code can contain text and element's width is set to 300px in a custom animated way.

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