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!
JavaScript's Role: Making the Web Interactive and DynamicApr 24, 2025 am 12:12 AMJavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.
C and JavaScript: The Connection ExplainedApr 23, 2025 am 12:07 AMC and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.
From Websites to Apps: The Diverse Applications of JavaScriptApr 22, 2025 am 12:02 AMJavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.
Python vs. JavaScript: Use Cases and Applications ComparedApr 21, 2025 am 12:01 AMPython is more suitable for data science and automation, while JavaScript is more suitable for front-end and full-stack development. 1. Python performs well in data science and machine learning, using libraries such as NumPy and Pandas for data processing and modeling. 2. Python is concise and efficient in automation and scripting. 3. JavaScript is indispensable in front-end development and is used to build dynamic web pages and single-page applications. 4. JavaScript plays a role in back-end development through Node.js and supports full-stack development.
The Role of C/C in JavaScript Interpreters and CompilersApr 20, 2025 am 12:01 AMC and C play a vital role in the JavaScript engine, mainly used to implement interpreters and JIT compilers. 1) C is used to parse JavaScript source code and generate an abstract syntax tree. 2) C is responsible for generating and executing bytecode. 3) C implements the JIT compiler, optimizes and compiles hot-spot code at runtime, and significantly improves the execution efficiency of JavaScript.
JavaScript in Action: Real-World Examples and ProjectsApr 19, 2025 am 12:13 AMJavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.
JavaScript and the Web: Core Functionality and Use CasesApr 18, 2025 am 12:19 AMThe main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.
Understanding the JavaScript Engine: Implementation DetailsApr 17, 2025 am 12:05 AMUnderstanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.
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
Atom editor mac version download
The most popular open source editor
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
Zend Studio 13.0.1
Powerful PHP integrated development environment
WebStorm Mac version
Useful JavaScript development tools
