Tips on using DOM event binding in js

This time I will bring you tips on how to use DOM event binding in js. What are the precautions when using DOM event binding in js? Here are practical cases, let’s take a look.

js event binding

JavaScript has three event models:

• Inline model

• Script model

• DOM2 model

##1. Inline model

//基本废除不用
<input type="button" value="按钮" onclick="alert(&#39;Lee&#39;);" />
<input type="button" value="按钮" onclick="box();" />

2. Script model

//基本不用
var input = document.getElementsByTagName('input')[0]; //得到 input 对象
 input.onclick = function () { //匿名函数执行
 alert('Lee');
};
事件处理函数 影响的元素 何时发生
onabort 图像 当图像加载被中断时
onblur 窗口、框架、所有表单对象 当焦点从对象上移开时
onchange 输入框，选择框和文本区域 当改变一个元素的值且失去焦点时
onclick 链接、按钮、表单对象、图像映射区域 当用户单击对象时
ondblclick 链接、按钮、表单对象 当用户双击对象时
ondragdrop 窗口 当用户将一个对象拖放到浏览器窗口时
onError 脚本 当脚本中发生语法错误时
onfocus 窗口、框架、所有表单对象 当单击鼠标或者将鼠标移动聚焦到窗口或框架时
onkeydown 文档、图像、链接、表单 当按键被按下时
onkeypress 文档、图像、链接、表单 当按键被按下然后松开时
onkeyup 文档、图像、链接、表单 当按键被松开时
onload 主题、框架集、图像 文档或图像加载后
onunload 主体、框架集 文档或框架集卸载后
onmouseout 链接 当图标移除链接时
onmouseover 链接 当鼠标移到链接时
onmove 窗口 当浏览器窗口移动时
onreset 表单复位按钮 单击表单的 reset 按钮
onresize 窗口 当选择一个表单对象时
onselect 表单元素 当选择一个表单对象时
onsubmit 表单 当发送表格到服务器时

3. Inline model

"DOM2-level events" defines two methods for adding events And operations to remove event handlers:

addEventListener() and removeEventListener(). These two methods are included in all DOM nodes, and they both accept 3 parameters; event name, function, bubbling or captured Boolean value (true means capturing, false means bubbling)

window.addEventListener('load', function () {
 alert('Lee');
}, false);
window.removeEventListener('load', function () {
 alert('Mr.Lee');
}, false)

PS: IE implements two methods similar to those in DOM: attachEvent() and detachEvent(). Both methods accept

the same parameters: event name and function.

When using these two sets of functions, let’s first talk about the differences:

1. IE 不支持捕获，只支持冒泡；
2. IE 添加事件不能屏蔽重复的函数；
3. IE 中的 this 指向的是 window 而不是 DOM 对象。
4. 在传统事件上，IE 是无法接受到 event 对象的，但使用了 attchEvent()却可以，但有些区别。
"javascript
window.attachEvent('load', function () {
 alert('Lee');
}, false);
window.detachEvent('load', function () {
 alert('Mr.Lee');
}, false)
"

PS: The event binding functions attachEvent() and detachEvent() in IE may not be used in practice There are several reasons for using:

1. IE9 will fully support the event binding function in W3C;

2. IE’s event binding function cannot pass this;

3. IE's event binding function does not support capture;

4. After the same function is registered and bound, it is not blocked;

5. There is a memory leak problem

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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