纯js代码实现列表全选和全不选的功能
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
* {
padding: 0;
margin: 0;
}
.wrap {
width: 300px;
margin: 100px auto 0;
}
table {
border-collapse: collapse;
border-spacing: 0;
border: 1px solid #c0c0c0;
width: 300px;
}
th,
td {
border: 1px solid #d0d0d0;
color: #404060;
padding: 10px;
}
th {
background-color: #09c;
font: bold 16px "微软雅黑";
color: #fff;
}
td {
font: 14px "微软雅黑";
}
tbody tr {
background-color: #f0f0f0;
}
tbody tr:hover {
cursor: pointer;
background-color: #fafafa;
}
</style>
</head>
<body>
<div class="wrap">
<table>
<thead>
<tr>
<th>
<input type="checkbox" id="j_cbAll"/>
</th>
<th>菜名</th>
<th>饭店</th>
</tr>
</thead>
<tbody id="j_tb">
<tr>
<td>
<input type="checkbox"/>
</td>
<td>红烧肉</td>
<td>食堂</td>
</tr>
<tr>
<td>
<input type="checkbox"/>
</td>
<td>西红柿鸡蛋</td>
<td>食堂</td>
</tr>
<tr>
<td>
<input type="checkbox"/>
</td>
<td>油炸榴莲</td>
<td>食堂</td>
</tr>
<tr>
<td>
<input type="checkbox"/>
</td>
<td>清蒸螃蟹</td>
<td>食堂</td>
</tr>
</tbody>
</table>
</div>
<script>
//获取全选的这个复选框
var ckAll = getElementById("j_cbAll");
//获取tbody中所有的小复选框
var cks = getElementById("j_tb").getElementsByTagName("input");
//点击全选的这个复选框,获取他当前的状态,然后设置tbody中所有复选框的状态
ckAll.onclick = function () {
//console.log(this.checked);
for (var i = 0; i < cks.length; i++) {
cks[i].checked = this.checked;
}
};
//获取tbody中所有的复选框,分别注册点击事件
for(var i=0;i<cks.length;i++){
cks[i].onclick=function () {
var flag=true;//默认都被选中了
//判断是否所有的复选框都选中
for(var j=0;j<cks.length;j++){
if(!cks[j].checked){
//没选中就进来了
flag=false;
break;
}
}
//全选的这个复选框的状态就是flag这个变量的值
ckAll.checked=flag;
};
}
</script>
</body>
</html>