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jQuery: Detailed explanation of the use of focus event

黄舟Original: 2017-06-27 11:30:111817browse

This article mainly introduces the usage of focus events in jQuery, and analyzes the usage techniques of focus events when obtaining focus in the form of examples. It has certain reference value. Friends in need can refer to the examples of this article

Describes the usage of focus event in jQuery. Share it with everyone for your reference. The specific analysis is as follows:

The focus event is triggered when an element obtains focus or calls the focus() method.

A complete event process must not only have conditions that can trigger the event, but also have an event processing program.
You can bind an event handler to the focus event through the focus() method. For example:

$("input").focus(function(){$(this).css("backgroundColor","red")})

The above code is to bind functionfunction as an event handler to the focus event through the focus() method. This function will be called when the focus event is triggered.
Example code:

<!DOCTYPE html> 
<html> 
<head> 
<meta charset=" utf-8"> 
<meta name="author" content="http://www.jb51.net/" /> 
<title>focus事件-脚本之家</title> 
<script type="text/
javascript
" src="mytest/jQuery/jquery-1.8.3.js"></script> 
<script type="text/javascript"> 
$(
document
).ready(function(){ 
  $("input").focus(function(){
    $(this).css("backgroundColor","red")
  }) 
})  
</script> 
</head> 
<body> 
<p> 
<ul> 
  <li>用户名:<input type="text" name="username" /></li> 
  <li>密码:<input type="password" name="userpassword" /></li> 
</ul> 
</p> 
</body> 
</html>

The above code can register the focus event handler for the input element, and set the background color of the text box when it gets focus.

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