JavaScript 实现二级联动

来源：互联网发布：你怎么看待网络暴力编辑：程序博客网时间：2024/04/30 10:29

效果图：

示例的代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<form action="" method="post">
<select name="" id="sheng">
<option>选择省</option>
</select>
<select name="" id="diqu">
<option>选择地区</option>
</select>
</form>
<script type="text/javascript">
var region = ['全国',
['北京市',
'东城区',
'西城区'
],
['河北省',
'石家庄市',
'沧州市'
],
['吉林省',
'长春市',
'吉林市'
]

];

window.onload = function(){

var sels = document.getElementById("sheng");
var seld = document.getElementById("diqu");

function init(){
for(var i = 1;i<region.length;i++){
var opt = document.createElement('option');
var txt = document.createTextNode(region[i][0]);
opt.appendChild(txt);
sels.appendChild(opt);
}

}

function onChange(){
var aRemove = seld.getElementsByTagName('option');
for(var j = aRemove.length-1;j>0;j--){
seld.removeChild(aRemove[j]);
}

if(this.selectedIndex){
for(i = 1;i<region[this.selectedIndex].length;i++){
var opt = document.createElement('option');
var txt = document.createTextNode(region[this.selectedIndex][i]);
opt.appendChild(txt);
seld.appendChild(opt);
}
}

}

init();
sels.onchange = onChange;

}//end

</script>
</body>
</html>

0 0