Interpret the two main types of jQuery libraries

Decrypting the two major categories of jQuery library

jQuery is a popular JavaScript library that is widely used in web development. It simplifies the writing of JavaScript code and Provides rich functions and plug-ins. When using jQuery, we often encounter two major categories of functions: DOM manipulation and event handling. This article explains in detail what these two categories do and provides specific code examples.

1. DOM operation

DOM operation is an important feature of the jQuery library, which allows us to easily obtain, operate and modify HTML elements in web pages through selectors. The following are several commonly used DOM operation methods:

1. Selector: You can easily obtain elements on the page through selectors. Common selectors include ID selector, class selector, and attribute selection. Devices etc.

// 通过ID选择器获取元素
var element = $("#myElement");

// 通过类选择器获取元素
var elements = $(".myClass");

// 通过属性选择器获取元素
var elements = $("input[type='text']");

2. Manipulate element attributes and styles: We can use jQuery to operate element attributes and styles, such as modifying the element's text, adding styles, setting attributes, etc.

// 修改元素文本
$("#myElement").text("Hello, jQuery!");

// 添加样式
$("#myElement").css("color", "red");

// 设置属性
$("#myElement").attr("data-id", 123);

3. Add, delete and move elements: jQuery can be used to dynamically add, delete and move web page elements.

// 添加元素
$("#container").append("<div>New element</div>");

// 删除元素
$("#elementToDelete").remove();

// 移动元素
$("#elementToMove").appendTo("#newContainer");

2. Event processing

Another important function is event processing. jQuery provides a wealth of event processing methods, allowing us to easily respond to user interactions. response. The following are several commonly used event handling methods:

1. Binding events: jQuery can be used to bind various events to page elements, such as click events, mouse hover events, keyboard events, etc.

// 点击事件
$("#myButton").click(function(){
    alert("Button clicked!");
});

// 悬停事件
$("#myElement").hover(function(){
    alert("Mouse over!");
}, function(){
    alert("Mouse out!");
});

2. Event delegation: You can use event delegation to optimize event processing and reduce the registration of a large number of event handlers on the page.

// 事件委托
$("#container").on("click", ".dynamicElement", function(){
    alert("Dynamic element clicked!");
});

3. Prevent event bubbling and default behavior: Sometimes we need to prevent event bubbling or default behavior. jQuery provides a convenient method to achieve this function.

// 阻止事件冒泡
$("#myLink").click(function(event){
    event.stopPropagation();
});

// 阻止默认行为
$("#myForm").submit(function(event){
    event.preventDefault();
});

Summary:

Through this article’s decryption of the two major categories of the jQuery library—DOM operations and event processing, we can better understand the powerful functions and application scenarios of jQuery . In actual development, mastering these two types of functions and flexibly using the methods can greatly improve the efficiency and quality of web development. I hope this article can be helpful to readers, and you are welcome to continue to explore more exciting functions of the jQuery library in practice!

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