


JQuery compares the difference between trigger() and triggerHandler() through a simple example
When making web page special effects, we sometimes need to use simulation operations, that is, simulating manual operations. At this time, we will think of the two simulation operation methods trigger() and triggerHandler() in JQuery. Both of these two methods can easily simulate manual operations, so what is the difference between them? Below, we will introduce their differences through a simple case. The effect of this case: Refresh the page, it will automatically simulate the effect of clicking the button, and a prompt will pop up.
First, create a new page and add the following HTML code to the page:
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>无标题文档</title> <style> *{padding:0; margin:0;} .hi{background:red;width:100px;height:100px; position:relative;} </style> <script type="text/javascript" src="/a/js/jquery-1.10.1.js"></script> <script type="text/javascript"> </script> </head> <body> <div class="hi"> <form action="http://wanlimm.com" > <input type="submit" value="aaa" /> <input type="submit" value="bbb" /> </form> </div> </body> </html>
The form of this HTML code has two buttons, and their values are "aaa" and "bbb" ", now click either of these two buttons, you will get the http://wanlimm.com page.
Then, add the JS code between :
$(function(){ $(":submit").click(function(e){ alert($(this).val()); }).trigger('click'); });
Here, the trigger method we use, Refresh this page, there will be two pop-up windows, showing "aaa" and "bbb" respectively, and then it will automatically use the form behavior to automatically jump to the page http://wanlimm.com.
If you replace trigger with triggerHandler, there will only be one pop-up window, and the form behavior will be blocked and will not automatically jump to the http://wanlimm.com page.
We then remove the blue form code in the html code, and then add the method CSS to the JS code, as follows:
$(function(){ $(":submit").click(function(e){ alert($(this).val()); }).trigger('click').css('color','red'); });
When we refresh the page, after 2 pop-ups , the text in the button will turn red. However, if the trigger is changed to triggerHandler, after refreshing the page, the window will only pop up once and the text will not turn red.
To summarize the differences between trigger and triggerHandler:
1. The triggerHandler() method does not trigger the default behavior of the event, but trigger() does.
2. The triggerHandler() method will only affect the first matched element, while .trigger() will affect all.
3. The triggerHandler() method cannot be connected to other methods, because it returns the return value of the current event execution, not the object; trigger() can be connected to other methods, because it returns the current event triggering element. jQuery object.
4. TriggerHandler() will not bubble when creating an event. trigger() will bubble, but this kind of bubbling can only be reflected by custom events.
The above is the detailed content of JQuery compares the difference between trigger() and triggerHandler() through a simple example. For more information, please follow other related articles on the PHP Chinese website!

Node.js excels at efficient I/O, largely thanks to streams. Streams process data incrementally, avoiding memory overload—ideal for large files, network tasks, and real-time applications. Combining streams with TypeScript's type safety creates a powe

The differences in performance and efficiency between Python and JavaScript are mainly reflected in: 1) As an interpreted language, Python runs slowly but has high development efficiency and is suitable for rapid prototype development; 2) JavaScript is limited to single thread in the browser, but multi-threading and asynchronous I/O can be used to improve performance in Node.js, and both have advantages in actual projects.

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.


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

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

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.

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

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
