js原生事件委托

来源：互联网发布：天天特价淘宝商城编辑：程序博客网时间：2024/05/22 06:55

1.普通的是事件委托这里有一个兼容性要注意,var e=e|| window.event;var target = e.target || e.srcElement; 都是为了兼容IE

<body>
<ul id="ul1">
<li>111</li>
<li>222</li>
<li>333</li>
<li>444</li>
</ul>
<script type="text/javascript">
window.onload=function(){
var oUl = document.getElementById("ul1");
oUl.onclick=function(e){
var e=e|| window.event;
var target = e.target || e.srcElement;
if(target.nodeName.toLowerCase() == "li"){
alert(target.innerHTML)
}
}
}
</script>
</body>

2,子元素每个事件都不相同,

<body>
<div id="box">
<input type="button" id="add" value="添加" />
<input type="button" id="remove" value="删除" />
<input type="button" id="move" value="移动" />
<input type="button" id="select" value="选择" />
</div>
</body>
<script type="text/javascript">
var oBox = document.getElementById("box");
oBox.onclick=function(e){
e = e || window.event;
var target = e.target || e.srcElement;
if(target.nodeName.toLowerCase() == 'input'){
switch(target.id){
case 'add':
alert('添加');
break;
case 'remove':
alert('删除');
break;
case 'move':
alert('移动');
break;
case 'select':
alert('选择');
}
}
}
</script>

3.新增子元素如何事件委托

<body>
<input type="button" name="" id="btn" value="添加" />
<ul id="ul1">
<li>111</li>
<li>222</li>
<li>333</li>
<li>444</li>
</ul>
</body>
<script type="text/javascript">
var oBtn = document.getElementById("btn");
var oUl = document.getElementById("ul1");
var aLi = oUl.getElementsByTagName('li');
var num = 4;

//事件委托，添加的子元素也有事件
oUl.onmouseover = function(ev){
var ev = ev || window.event;
var target = ev.target || ev.srcElement;
if(target.nodeName.toLowerCase() == 'li'){
target.style.background = "red";
}

};
oUl.onmouseout = function(ev){
var ev = ev || window.event;
var target = ev.target || ev.srcElement;
if(target.nodeName.toLowerCase() == 'li'){
target.style.background = "#fff";
}

};
oBtn.onclick = function(){
num++;
var oLi = document.createElement('li');
oLi.innerHTML = 111*num;
oUl.appendChild(oLi)
}
</script>

阅读全文

0 0