A brief introduction to jQuery event binding

Introduction to jQuery event binding method

jQuery is a very popular JavaScript library that simplifies page operations and event handling. In jQuery, event binding is a very common operation, and corresponding actions can be triggered through event binding methods. This article will introduce several commonly used jQuery event binding methods, and attach specific code examples.

1. .on() method

.on() method is one of the most commonly used event binding methods in jQuery. It can bind one or more elements to one or more elements. event. The syntax is as follows:

$(selector).on(event, function);

Among them, selector represents the element to be bound to the event, event represents the event type to be bound (such as click, mouseover, etc.), and function represents the function to be executed when the event is triggered.

The sample code is as follows:

$("button").on("click", function(){
  alert("按钮被点击了！");
});

2. .click() method

.click() method is a simplified version of .on() method, used to bind elements Define click event. The syntax is as follows:

$(selector).click(function);

The sample code is as follows:

$("button").click(function(){
  alert("按钮被点击了！");
});

3. .bind() method

.bind() method is also used to bind events in jQuery 3.0 It has been deprecated and it is recommended to use the .on() method instead. The syntax is as follows:

$(selector).bind(event, function);

The sample code is as follows:

$("button").bind("click", function(){
  alert("按钮被点击了！");
});

4. .delegate() method

.delegate() method is used for event delegation and can be used for dynamically added elements Bind events. The syntax is as follows:

$(ancestorSelector).delegate(descendantSelector, event, function);

Among them, ancestorSelector represents the ancestor element, descendantSelector represents the descendant element, event represents the event type to be bound, and function represents the function to be executed when the event is triggered.

The sample code is as follows:

$("ul").delegate("li", "click", function(){
  alert("列表项被点击了！");
});

5. .live() method

.live() method is also used for event delegation, but it has been deprecated in jQuery 1.7, It is recommended to use the .on() method instead. The syntax is as follows:

$(selector).live(event, function);

The sample code is as follows:

$("button").live("click", function(){
  alert("按钮被点击了！");
});

Through the introduction of this article, readers can learn about several commonly used jQuery event binding methods and get started quickly through code examples. In actual development, choosing the appropriate event binding method according to specific scenarios and needs not only improves the efficiency of the code, but also improves the user experience. I hope readers will be able to use jQuery with ease and write smoother front-end interactive code.

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