Web Front-endJS TutorialDetailed explanation of mouseover and mouseout events of jQuery nested elementsDetailed explanation of mouseover and mouseout events of jQuery nested elements
Today, while helping others solve a problem about mouseover and mouseout, I discovered a problem that I didn't expect. I'm brave enough to share it with you, experts. .
Problem: There are three layers of nested divs. div111 is the outermost layer, div222 is the middle layer, and div333 is the innermost layer.
Effect: When the mouse is above the div, the mouseover of the corresponding layer is triggered. When the attribute leaves the top of the div, the mouseout of the corresponding layer is triggered. (For example: when the mouse moves from div111 to the sub-elements div222, div333, the mouseleave event of div111 will not be triggered. Conversely, when the mouse moves from the sub-elements div222, div333 to div111, the mouseenter event of div111 will not be triggered.
This code also solves some problems caused by mouseover and mouseout due to the bubbling of child elements. I wonder if there is a better solution?
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>test</title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<style>
#div111{
width:200px; height :200px ; background :red; margin :100px auto auto 100px; border: 2px solid white;
}
#div222{
width:100px; height :100px; background :yellow; border: 2px solid white;
}
#div333{
width:50px; height :50px; background :blue; border: 2px solid white;
}
</style>
</head>
<body>
<div id="div111">
<div id="div222">
<div id="div333"></div>
</div>
</div>
<div id="log"></div>
<script type ="text/javascript" >
function mouse_over(event){
var elem = $(event.currentTarget),
fromElem = $(event.relatedTarget);
if(elem.has(fromElem).length === 0 || !fromElem.is(elem)){
elem.css('border-color', 'green');
log(elem.attr('id'), event.type);
}
};
function mouse_out(event){
var elem = $(event.currentTarget),
toElem = $(event.relatedTarget);
if(elem.has(toElem).length === 0 || !toElem.is(elem)){
elem.css('border-color', 'white');
log(elem.attr('id'), event.type);
}
};
function log(id, type){
$("#log").append("<div><span>" + id + "触发了<strong><font color='red'>" + type + "</font></strong>事件</span></div>");
}
$('#div111').mouseover(mouse_over);
$('#div222').mouseover(mouse_over);
$('#div333').mouseover(mouse_over);
$('#div111').mouseout(mouse_out);
$('#div222').mouseout(mouse_out);
$('#div333').mouseout(mouse_out);
</script>
</body>
</html>There are two magical events in jquery
One is called mouseenter
The other is called mouseleave
mouseenter and mouseleave cannot achieve this effect at all. For nesting, they are useless.
No, I thought it was a big problem. Just bind the event once and use e.target to determine which element it happened on. Processing based on the element saves resources.
mouseover/out is bubbling, so it will naturally cause this problem
Use mouseenter/leave under IE
When registering with addEventListener under other browsers, just pass true in the third parameter
IE mouseenter/leave, when the mouse moves from div111 to div222, the mouseleave of div111 and the mouseenter of div222 will be triggered. Conversely, when the mouse moves from div222 to div111, the mouseleave of div222 and the mouseenter of div111 will be triggered, which does not meet the requirements at all. , they are only suitable for applications without nesting.
The capture mode of other browsers will not be simpler than the bubble mode, and it is not compatible with IE.
But mouseenter and mouseleave are not. It was created to solve this problem. It can also handle nested bubbling.
Jquery is not easy to use! I think it depends on the situation.
There is no difference between
$().mouseenter(function(){
//do something
});and
$().mouseover(function(event){
if(!$(this).data('mouseover').mouseover){
$(this).data('mouseover', {mouseover: true});
//do something
}
event.stopPropagation();
});The above is the detailed content of Detailed explanation of mouseover and mouseout events of jQuery nested elements. For more information, please follow other related articles on the PHP Chinese website!
Python vs. JavaScript: A Comparative Analysis for DevelopersMay 09, 2025 am 12:22 AMThe main difference between Python and JavaScript is the type system and application scenarios. 1. Python uses dynamic types, suitable for scientific computing and data analysis. 2. JavaScript adopts weak types and is widely used in front-end and full-stack development. The two have their own advantages in asynchronous programming and performance optimization, and should be decided according to project requirements when choosing.
Python vs. JavaScript: Choosing the Right Tool for the JobMay 08, 2025 am 12:10 AMWhether to choose Python or JavaScript depends on the project type: 1) Choose Python for data science and automation tasks; 2) Choose JavaScript for front-end and full-stack development. Python is favored for its powerful library in data processing and automation, while JavaScript is indispensable for its advantages in web interaction and full-stack development.
Python and JavaScript: Understanding the Strengths of EachMay 06, 2025 am 12:15 AMPython and JavaScript each have their own advantages, and the choice depends on project needs and personal preferences. 1. Python is easy to learn, with concise syntax, suitable for data science and back-end development, but has a slow execution speed. 2. JavaScript is everywhere in front-end development and has strong asynchronous programming capabilities. Node.js makes it suitable for full-stack development, but the syntax may be complex and error-prone.
JavaScript's Core: Is It Built on C or C ?May 05, 2025 am 12:07 AMJavaScriptisnotbuiltonCorC ;it'saninterpretedlanguagethatrunsonenginesoftenwritteninC .1)JavaScriptwasdesignedasalightweight,interpretedlanguageforwebbrowsers.2)EnginesevolvedfromsimpleinterpreterstoJITcompilers,typicallyinC ,improvingperformance.
JavaScript Applications: From Front-End to Back-EndMay 04, 2025 am 12:12 AMJavaScript can be used for front-end and back-end development. The front-end enhances the user experience through DOM operations, and the back-end handles server tasks through Node.js. 1. Front-end example: Change the content of the web page text. 2. Backend example: Create a Node.js server.
Python vs. JavaScript: Which Language Should You Learn?May 03, 2025 am 12:10 AMChoosing Python or JavaScript should be based on career development, learning curve and ecosystem: 1) Career development: Python is suitable for data science and back-end development, while JavaScript is suitable for front-end and full-stack development. 2) Learning curve: Python syntax is concise and suitable for beginners; JavaScript syntax is flexible. 3) Ecosystem: Python has rich scientific computing libraries, and JavaScript has a powerful front-end framework.
JavaScript Frameworks: Powering Modern Web DevelopmentMay 02, 2025 am 12:04 AMThe power of the JavaScript framework lies in simplifying development, improving user experience and application performance. When choosing a framework, consider: 1. Project size and complexity, 2. Team experience, 3. Ecosystem and community support.
The Relationship Between JavaScript, C , and BrowsersMay 01, 2025 am 12:06 AMIntroduction I know you may find it strange, what exactly does JavaScript, C and browser have to do? They seem to be unrelated, but in fact, they play a very important role in modern web development. Today we will discuss the close connection between these three. Through this article, you will learn how JavaScript runs in the browser, the role of C in the browser engine, and how they work together to drive rendering and interaction of web pages. We all know the relationship between JavaScript and browser. JavaScript is the core language of front-end development. It runs directly in the browser, making web pages vivid and interesting. Have you ever wondered why JavaScr
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
SublimeText3 English version
Recommended: Win version, supports code prompts!
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.
Dreamweaver CS6
Visual web development tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Mac version
God-level code editing software (SublimeText3)
