Analyze the role and usage of the on() function in jQuery
This article mainly introduces the usage of the on() method in jQuery. The example analyzes the function and definition of the on() method and the use of binding one or more event processing functions on matching elements. For tips, friends who need them can refer to
This article explains the usage of the on() method in jQuery with examples. Share it with everyone for your reference. The specific analysis is as follows:
This method can bind one or more event handling functions to the matching element.
Use the off() method to delete the event bound by the on() method.
Grammar structure one:
The code is as follows:
$(selector).on(events,[selector], [data],fn)
Parameter list:
Example code:
Example 1:
The code is as follows:
<!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">
p{
width:60px;
height:60px;
border:1px solid green;
font-size:12px;
}
</style>
<script type="text/
javascript
" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("p").on("click",function(){
$(this).text("脚本之家欢迎您");
})
})
</script>
</head>
<body>
<p>原来内容</p>
</body>
</html>The above code binds a click event to p. When p is clicked Ability to set new text content for p.
Example 2:
The code is as follows:
<!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">
p{
width:60px;
height:60px;
border:1px solid green;
font-size:12px;
}
</style>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("p").on("click mousemove",function(){
$(this).text("脚本之家欢迎您");
})
})
</script>
</head>
<body>
<p>原来内容</p>
</body>
</html>The above code binds two events to p. Whether you click p or move the mouse in p, a new event will be set for p. text content.
Example 3:
The code is as follows:
<!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">
p{
width:60px;
height:60px;
border:1px solid green;
font-size:12px;
}
</style>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var newtext="这是新文本"
$("p").on("click",{"mytext":newtext},function(e){
$(this).text(e.data.mytext);
})
})
</script>
</head>
<body>
<p>原来内容</p>
</body>
</html>The above code uses the data parameter to pass data to the bound event processing function.
Example 4:
The code is as follows:
<!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">
.parent{
width:160px;
height:160px;
border:1px solid green;
font-size:12px;
}
.children{
width:100px;
height:100px;
border:1px solid red;
}
span{background-color:green;}
</style>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var newtext="这是新文本"
$(".parent").on("click",".children",{"mytext":newtext},function(e){
$(this).text(e.data.mytext);
})
})
</script>
</head>
<body>
<p class="parent">
<p class="children"><span>原来内容</span></p>
</p>
<span>大家好</span>
</body>
</html>The above code uses the selector string to filter which of the child elements of the matching element can respond to the bound event. In the above code, the element with the class name children and its child elements can call bound events.
Grammar structure two:
The code is as follows:
$(selector).on(object,[selector],[data])
parameter list:
实例代码:
代码如下:
<!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">
p{
width:160px;
height:160px;
border:1px solid green;
font-size:12px;
}
</style>
<script type="text/javascript" src="mytest/jQuery/jquery-1.8.3.js"></script>
<script type="text/javascript">
$(document).ready(function(){
var newtext="这是新文本"
$("p").on({click:function(e){
$(this).text(e.data.mytext);
}},{"mytext":newtext})
})
</script>
</head>
<body>
<p>原来内容</p>
</body>
</html>以上代码中，事件类型和事件处理函数以对象的形式绑定的。
The above is the detailed content of Analyze the role and usage of the on() function in jQuery. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Tips for dynamically creating new functions in golang functions
Apr 25, 2024 pm 02:39 PM
Go language provides two dynamic function creation technologies: closure and reflection. closures allow access to variables within the closure scope, and reflection can create new functions using the FuncOf function. These technologies are useful in customizing HTTP routers, implementing highly customizable systems, and building pluggable components.
Considerations for parameter order in C++ function naming
Apr 24, 2024 pm 04:21 PM
In C++ function naming, it is crucial to consider parameter order to improve readability, reduce errors, and facilitate refactoring. Common parameter order conventions include: action-object, object-action, semantic meaning, and standard library compliance. The optimal order depends on the purpose of the function, parameter types, potential confusion, and language conventions.
How to write efficient and maintainable functions in Java?
Apr 24, 2024 am 11:33 AM
The key to writing efficient and maintainable Java functions is: keep it simple. Use meaningful naming. Handle special situations. Use appropriate visibility.
Complete collection of excel function formulas
May 07, 2024 pm 12:04 PM
1. The SUM function is used to sum the numbers in a column or a group of cells, for example: =SUM(A1:J10). 2. The AVERAGE function is used to calculate the average of the numbers in a column or a group of cells, for example: =AVERAGE(A1:A10). 3. COUNT function, used to count the number of numbers or text in a column or a group of cells, for example: =COUNT(A1:A10) 4. IF function, used to make logical judgments based on specified conditions and return the corresponding result.
Comparison of the advantages and disadvantages of C++ function default parameters and variable parameters
Apr 21, 2024 am 10:21 AM
The advantages of default parameters in C++ functions include simplifying calls, enhancing readability, and avoiding errors. The disadvantages are limited flexibility and naming restrictions. Advantages of variadic parameters include unlimited flexibility and dynamic binding. Disadvantages include greater complexity, implicit type conversions, and difficulty in debugging.
What is the difference between custom PHP functions and predefined functions?
Apr 22, 2024 pm 02:21 PM
The difference between custom PHP functions and predefined functions is: Scope: Custom functions are limited to the scope of their definition, while predefined functions are accessible throughout the script. How to define: Custom functions are defined using the function keyword, while predefined functions are defined by the PHP kernel. Parameter passing: Custom functions receive parameters, while predefined functions may not require parameters. Extensibility: Custom functions can be created as needed, while predefined functions are built-in and cannot be modified.
C++ Function Exception Advanced: Customized Error Handling
May 01, 2024 pm 06:39 PM
Exception handling in C++ can be enhanced through custom exception classes that provide specific error messages, contextual information, and perform custom actions based on the error type. Define an exception class inherited from std::exception to provide specific error information. Use the throw keyword to throw a custom exception. Use dynamic_cast in a try-catch block to convert the caught exception to a custom exception type. In the actual case, the open_file function throws a FileNotFoundException exception. Catching and handling the exception can provide a more specific error message.
Advanced usage of reference parameters and pointer parameters in C++ functions
Apr 21, 2024 am 09:39 AM
Reference parameters in C++ functions (essentially variable aliases, modifying the reference modifies the original variable) and pointer parameters (storing the memory address of the original variable, modifying the variable by dereferencing the pointer) have different usages when passing and modifying variables. Reference parameters are often used to modify original variables (especially large structures) to avoid copy overhead when passed to constructors or assignment operators. Pointer parameters are used to flexibly point to memory locations, implement dynamic data structures, or pass null pointers to represent optional parameters.
