This article will introduce the stopPropagation() method along with useful code examples. After that, we will understand the difference between stopPropagation() and PreventDefault() methods.
stopPropagation() event method - Parent elements cannot access events using this method method. Generally speaking, this function is created to prevent multiple calls to the same event spread. For example, if a button element is contained within a div tag, and they both have a onclick event, whenever we try to activate the event associated with the button element, The event associated with the div element will also be fired because the div element is indeed Button element.
grammar
event.stopPropagation();
stopPropagation() method will block the parent access event and can be used solve this problem.
Example 1
<!DOCTYPE html> <html> <title>What is the use of stopPropagation method in JavaScript - TutorialsPoint</title> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <style> div { padding: 50px; background-color: rgba(10, 111, 134, 0.2); text-align: center; cursor: pointer; } </style> <!-- jQuery library --> <script src="https://code.jquery.com/jquery-git.js"></script> </head> <body> <h1 id="Let-us-understand-the-stopPropagation-Method">Let us understand the stopPropagation() Method</h1> <p>Test the results by clicking the DIV(1) & DIV(2) as shown below in the color boxes:</p> <div onclick="myFunction2()">This is my Second DIV(2) <div onclick="myFunction1(event)">This is my First DIV(1)</div> </div> Check to stop propagation event: <input type="checkbox" id="check"> <p></p> <p>Because my First DIV(1) is inside Second DIV(2), both DIVs get clicked when you click on First DIV(1). </p> <p>You can test it by check and uncheck the stop propagation checkbox, to get the outcome.</p> <p>You can stop the current event from propagating by using the stopPropagation() method.</p> <script> function myFunction1(event) { alert("My First DIV(1)"); if (document.getElementById("check").checked) { event.stopPropagation(); } } function myFunction2() { alert("My Second DIV(2)"); } </script> </body> </html>
After clicking on the outer div "my Second DIV(2)", the confirmation box is only displayed once, as shown below.
Additionally, if you click on the inner div "my First DIV(1)", the confirmation box will be displayed twice as shown below.
Next, after clicking the "OK" button, the outer div "My Second DIV(2)" confirmation box will be displayed.
Just check a checkbox and click the inner div "my First DIV(1)" like Screenshot below. The confirmation box only appears once.
Example 2
In this example, let us understand how the event.stopPropagation() method is implemented, This will cause a single function to be executed on the button element.
<!DOCTYPE html> <html> <title>What is the use of stopPropagation method in JavaScript - TutorialsPoint</title> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script> <style> div { padding: 50px; background-color: rgba(63, 65, 45, 0.2); text-align: center; } </style> <!-- jQuery library --> <script src="https://code.jquery.com/jquery-git.js"></script> </head> <body> <h3>The button element's single function will be executed with stopPropagation() Method </h3> <p>Test the result by clicking the button as shown below in the color boxe:</p> <div class="first" onclick="functionFirst()"> <button type="button" class="btn btn-success btn-lg" onclick="functionSecond()"> Button </button> </div> <p></p> <script> function functionSecond() { event.stopPropagation(); alert("This is my First DIV(1)"); } function functionFirst() { alert("This is my Second DIV(2)"); } </script> </body> </html>
preventDefault() method - This is the method found in the event interface. By using this method, Prevents the browser from performing the default action for the selected element. only if If the technology is able to do this, the event is cancelable. For example, the scroll and wheel events are Some examples of unavoidable events.
grammar
preventDefault() Method
Example 3
Let’s understand how to prevent a link from following the URL in this example so that it is inaccessible to the browser Visit another page.
<!DOCTYPE html> <html> <title>What is the use of stopPropagation method in JavaScript - TutorialsPoint</title> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- Using jquery library --> <script src="https://code.jquery.com/jquery-git.js"></script> </head> <body> <a id="myLink" href="www.tutorialspoint.com"> Welcome to Tutorialspoint! </a> <script> $("#myLink").click(function() { event.preventDefault(); alert("This event is prevented, you can't visit the URL."); }); </script> </body> </html>
Click the link and you will see a confirmation box that says "This event has been blocked and you cannot access the URL."
The above is the detailed content of What is the use of stopPropagation method in JavaScript. For more information, please follow other related articles on the PHP Chinese website!

JavaScript originated in 1995 and was created by Brandon Ike, and realized the language into C. 1.C language provides high performance and system-level programming capabilities for JavaScript. 2. JavaScript's memory management and performance optimization rely on C language. 3. The cross-platform feature of C language helps JavaScript run efficiently on different operating systems.

JavaScript runs in browsers and Node.js environments and relies on the JavaScript engine to parse and execute code. 1) Generate abstract syntax tree (AST) in the parsing stage; 2) convert AST into bytecode or machine code in the compilation stage; 3) execute the compiled code in the execution stage.

The future trends of Python and JavaScript include: 1. Python will consolidate its position in the fields of scientific computing and AI, 2. JavaScript will promote the development of web technology, 3. Cross-platform development will become a hot topic, and 4. Performance optimization will be the focus. Both will continue to expand application scenarios in their respective fields and make more breakthroughs in performance.

Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript 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 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.

JavaScript 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.


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

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

SublimeText3 English version
Recommended: Win version, supports code prompts!

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

SublimeText3 Chinese version
Chinese version, very easy to use

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.
