How to use js to bind DOM events in the project
This time I will show you how to use js to bind DOM events in the project. What are the precautions for using js to bind DOM events in the project? The following is a practical case, 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('Lee');" /> <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)
the same parameters: event name and function.
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) "
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