Focus events: 1. Use the focus() method to set the element to obtain the focus event, the syntax is "$(selector).focus(function)"; 2. Use the blur() method to set the element to lose the focus event, the syntax is is "$(selector).blur(function)".
The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.
What is javascript focus event
The focus event occurs when an element gains focus.
When an element is selected by mouse click or positioned by tab key, the element will gain focus.
The focus() method triggers the focus event, or specifies a function to run when the focus event occurs.
The syntax is:
$(selector).focus()
or:
$(selector).focus(function)
The blur event occurs when the element loses focus.
blur() method triggers the blur event, or specifies a function to run when the blur event occurs.
The syntax is:
$(selector).blur()
or:
$(selector).blur(function)
The example is as follows:
<html>
<head>
<script type="text/javascript" src="/jquery/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("input").focus(function(){
$("input").css("background-color","#FFFFCC");
});
$("input").blur(function(){
$("input").css("background-color","#D6D6FF");
});
});
</script>
</head>
<body>
Enter your name: <input type="text" />
<p>请在上面的输入域中点击，使其获得焦点，然后在输入域外面点击，使其失去焦点。</p>
</body>
</html>Output result:
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