Web Front-end
JS Tutorial
In-depth discussion of the working principle and practical application of jQuery listening method
In-depth discussion of the working principle and practical application of jQuery listening method
jQuery is a JavaScript library widely used in web development. It simplifies the traversal, manipulation, event handling, and animation of HTML documents. Among them, the listening method is a very important part of jQuery, which can help us respond to user operations. This article will introduce the principles and applications of jQuery listening methods in detail, and give specific code examples.
1. The principle of jQuery listening method
In jQuery, the listening method is mainly implemented through the on() method, which binds to the specified selector element. Define one or more event handling functions. The principle of the listening method is based on the DOM event model, that is, event bubbling and event capturing. Event bubbling starts from a specific element and propagates upward to the root node of the document tree; event capture propagates downward from the root node of the document tree to specific elements.
The jQuery listening method uses this mechanism. When binding the event processing function, you can choose whether to use event bubbling or event capturing. Through the monitoring method, we can simply and efficiently implement monitoring and response to user operations.
2. Application of jQuery listening method
(1) Element click event monitoring
<!DOCTYPE html>
<html>
<head>
<title>jQuery监听方法示例</title>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("#btn").on("click", function(){
alert("按钮被点击了！");
});
});
</script>
</head>
<body>
<button id="btn">点击我</button>
</body>
</html>In the above sample code, we use on() The method listens to the click event of the button. When the button is clicked, a prompt box pops up. This is one of the simplest applications of the listening method.
(2) Element mouse hover event monitoring
<!DOCTYPE html>
<html>
<head>
<title>jQuery监听方法示例</title>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("#hoverElement").on("mouseover", function(){
$(this).css("color", "red");
});
$("#hoverElement").on("mouseout", function(){
$(this).css("color", "black");
});
});
</script>
</head>
<body>
<p id="hoverElement">鼠标悬停在这里试试看</p>
</body>
</html>In this example, we listen to the mouse hover event and mouse move out event of the element, and realize that the text turns red when the mouse hovers. , the effect of the text returning to black when the mouse is moved out.
3. Conclusion
By understanding the principles and applications of jQuery listening methods, we can handle user operations more flexibly and improve the interactivity and user experience of web pages. In actual development, the listening method is one of the commonly used functions in jQuery. Being proficient in its principles and applications can help us better develop feature-rich Web pages.
We hope that the content introduced in this article can help readers better understand the jQuery monitoring method and apply it to actual projects in daily development. jQuery is a powerful, easy-to-learn and easy-to-use JavaScript library that is an indispensable tool for front-end developers.
The above is the detailed content of In-depth discussion of the working principle and practical application of jQuery listening method. 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
1386
52
How to recover deleted contacts on WeChat (simple tutorial tells you how to recover deleted contacts)
May 01, 2024 pm 12:01 PM
Unfortunately, people often delete certain contacts accidentally for some reasons. WeChat is a widely used social software. To help users solve this problem, this article will introduce how to retrieve deleted contacts in a simple way. 1. Understand the WeChat contact deletion mechanism. This provides us with the possibility to retrieve deleted contacts. The contact deletion mechanism in WeChat removes them from the address book, but does not delete them completely. 2. Use WeChat’s built-in “Contact Book Recovery” function. WeChat provides “Contact Book Recovery” to save time and energy. Users can quickly retrieve previously deleted contacts through this function. 3. Enter the WeChat settings page and click the lower right corner, open the WeChat application "Me" and click the settings icon in the upper right corner to enter the settings page.
How to set font size on mobile phone (easily adjust font size on mobile phone)
May 07, 2024 pm 03:34 PM
Setting font size has become an important personalization requirement as mobile phones become an important tool in people's daily lives. In order to meet the needs of different users, this article will introduce how to improve the mobile phone use experience and adjust the font size of the mobile phone through simple operations. Why do you need to adjust the font size of your mobile phone - Adjusting the font size can make the text clearer and easier to read - Suitable for the reading needs of users of different ages - Convenient for users with poor vision to use the font size setting function of the mobile phone system - How to enter the system settings interface - In Find and enter the "Display" option in the settings interface - find the "Font Size" option and adjust it. Adjust the font size with a third-party application - download and install an application that supports font size adjustment - open the application and enter the relevant settings interface - according to the individual
The secret of hatching mobile dragon eggs is revealed (step by step to teach you how to successfully hatch mobile dragon eggs)
May 04, 2024 pm 06:01 PM
Mobile games have become an integral part of people's lives with the development of technology. It has attracted the attention of many players with its cute dragon egg image and interesting hatching process, and one of the games that has attracted much attention is the mobile version of Dragon Egg. To help players better cultivate and grow their own dragons in the game, this article will introduce to you how to hatch dragon eggs in the mobile version. 1. Choose the appropriate type of dragon egg. Players need to carefully choose the type of dragon egg that they like and suit themselves, based on the different types of dragon egg attributes and abilities provided in the game. 2. Upgrade the level of the incubation machine. Players need to improve the level of the incubation machine by completing tasks and collecting props. The level of the incubation machine determines the hatching speed and hatching success rate. 3. Collect the resources required for hatching. Players need to be in the game
How to add touch events to pictures in vue
May 02, 2024 pm 10:21 PM
How to add click event to image in Vue? Import the Vue instance. Create a Vue instance. Add images to HTML templates. Add click events using the v-on:click directive. Define the handleClick method in the Vue instance.
Hongmeng HarmonyOS and Go language development
Apr 08, 2024 pm 04:48 PM
Introduction to HarmonyOS and Go language development HarmonyOS is a distributed operating system developed by Huawei, and Go is a modern programming language. The combination of the two provides a powerful solution for developing distributed applications. This article will introduce how to use Go language for development in HarmonyOS, and deepen understanding through practical cases. Installation and Setup To use Go language to develop HarmonyOS applications, you need to install GoSDK and HarmonyOSSDK first. The specific steps are as follows: #Install GoSDKgogetgithub.com/golang/go#Set PATH
What is the event-driven mechanism of C++ functions in concurrent programming?
Apr 26, 2024 pm 02:15 PM
The event-driven mechanism in concurrent programming responds to external events by executing callback functions when events occur. In C++, the event-driven mechanism can be implemented with function pointers: function pointers can register callback functions to be executed when events occur. Lambda expressions can also implement event callbacks, allowing the creation of anonymous function objects. The actual case uses function pointers to implement GUI button click events, calling the callback function and printing messages when the event occurs.
Detailed explanation of JavaScript obtaining web page elements
Apr 09, 2024 pm 12:45 PM
Answer: JavaScript provides a variety of methods for obtaining web page elements, including using ids, tag names, class names, and CSS selectors. Detailed description: getElementById(id): Get elements based on unique id. getElementsByTagName(tag): Gets the element group with the specified tag name. getElementsByClassName(class): Gets the element group with the specified class name. querySelector(selector): Use CSS selector to get the first matching element. querySelectorAll(selector): Get all matches using CSS selector
How to choose a mobile phone screen protector to protect your mobile phone screen (several key points and tips for purchasing mobile phone screen protectors)
May 07, 2024 pm 05:55 PM
Mobile phone film has become one of the indispensable accessories with the popularity of smartphones. To extend its service life, choose a suitable mobile phone film to protect the mobile phone screen. To help readers choose the most suitable mobile phone film for themselves, this article will introduce several key points and techniques for purchasing mobile phone film. Understand the materials and types of mobile phone films: PET film, TPU, etc. Mobile phone films are made of a variety of materials, including tempered glass. PET film is relatively soft, tempered glass film has good scratch resistance, and TPU has good shock-proof performance. It can be decided based on personal preference and needs when choosing. Consider the degree of screen protection. Different types of mobile phone films have different degrees of screen protection. PET film mainly plays an anti-scratch role, while tempered glass film has better drop resistance. You can choose to have better
