jQuery event monitoring in different ways

jQuery is a very popular JavaScript library that provides many convenient functions to operate HTML elements, handle events, etc. In jQuery, event listening is a common operation and can be implemented in different ways. This article will introduce several commonly used jQuery event listening implementation methods and provide specific code examples.

1. Use the on()method

on()method is the method used to bind event listeners in jQuery. It can Used to bind multiple event types, such as click, mouseover, keydown, etc. You can bind an event listener to one or more elements and specify a function to be executed when the event is triggered.

// 绑定click事件监听器
$("#btn1").on("click", function(){
    alert("按钮1被点击了！");
});

// 绑定mouseover和mouseout事件监听器
$("#btn2").on({
    mouseenter: function(){
        $(this).css("background-color", "yellow");
    },
    mouseleave: function(){
        $(this).css("background-color", "white");
    }
});

2. Use click(), mouseover() and other methods

In addition to the on() method, jQuery It also provides some methods specifically used to bind specific events, such as click(), mouseover(), etc. These methods can simplify the process of event listener binding.

// 绑定click事件监听器
$("#btn3").click(function(){
    alert("按钮3被点击了！");
});

// 绑定mouseover事件监听器
$("#btn4").mouseover(function(){
    $(this).css("background-color", "lightblue");
}).mouseout(function(){
    $(this).css("background-color", "white");
});

3. Use event delegation

Event delegation is a way to optimize event processing, which can reduce the number of event listeners and improve performance. By binding an event listener on the parent element, and then performing the corresponding action based on the actual clicked element.

// 使用事件委托绑定click事件监听器
$("#btnGroup").on("click", ".btn", function(){
    alert("按钮被点击了！按钮ID：" + $(this).attr("id"));
});

Summary

This article introduces several common implementation methods of jQuery event monitoring, including using the on() method, specific event methods and event delegation. Different methods are suitable for different scenarios, and you can choose the appropriate method to implement event monitoring according to actual needs. I hope the above content is helpful to you, thank you for reading!

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