Detailed explanation of examples of jQuery :empty selector-JS Tutorial-php.cn

Detailed explanation of examples of jQuery :empty selector

黄舟

Release： 2017-06-23 11:18:44

Original

1401 people have browsed it

Overview

Match all empty elements that do not contain child elements or text

Example

Description:

Find all empty elements that do not contain child elements or text Empty element

HTML code:

<table> <tr><td>Value 1</td><td></td></tr> <tr><td>Value 2</td><td></td></tr> </table>

Copy after login

jQuery code:

$("td:empty")

Copy after login

Result:

[ <td></td>, <td></td> ]

Copy after login

This selector matches all An empty element containing child elements or text.

Note: Spaces also belong to elements included in the selector.

Syntax structure:

$(":empty")

Copy after login

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

Copy the code The code is as follows:

$("li:empty").animate({width:"200px"})

Copy after login

The above code can set the width of the empty li element in the li element collection to 200px in a custom animation.

Example code:

Example one:






脚本之家







  html专区
  div+css专区
  Jquery专区
  Javascript专区

Copy after login

Example two:

<!DOCTYPE html>
<html>
<head>
<meta charset=" utf-8">
<meta name="author" content="http://www.jb51.net/" />
<title>脚本之家</title>
<style type="text/css">
li {
  list-style-type:none;
  width:150px;
  height:30px;
  border:1px solid red;
}
.run{background-color:green;}
.static{background-color:#603;}
div{
  width:100px;
  height:30px;
  background-color:blue;
}
</style>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript"> 
$(document).ready(function(){ 
  $("button").click(function(){ 
    $("*:empty").animate({width:"200px"}); 
  }) 
}) 
</script>
</head>
<body>
<ul>
  <li>html专区</li>
  <li>div+css专区</li>
  <li>Jquery专区</li>
  <li>Javascript专区</li>
  <li></li>
</ul>
<div></div>
<button>点击查看效果</button>
</body>
</html>

Copy after login

Because the above code does not specify the use with the :empty selector selector, so it is used with the * selector by default, and can set the length of empty elements in all elements to 200px in a custom animation.

The above is the detailed content of Detailed explanation of examples of jQuery :empty selector. For more information, please follow other related articles on the PHP Chinese website!