jQuery event monitoring in different ways
Feb 27, 2024 am 09:54 AM
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.
// 綁定click事件監(jiān)聽器
$("#btn1").on("click", function(){
alert("按鈕1被點擊了！");
});
// 綁定mouseover和mouseout事件監(jiān)聽器
$("#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.
// 綁定click事件監(jiān)聽器
$("#btn3").click(function(){
alert("按鈕3被點擊了！");
});
// 綁定mouseover事件監(jiān)聽器
$("#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.
// 使用事件委托綁定click事件監(jiān)聽器
$("#btnGroup").on("click", ".btn", function(){
alert("按鈕被點擊了！按鈕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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