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| <!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JAVASCRIPT制作二级联动菜单_教程版</title>
<script type="text/javascript">
var arr_province = ["请选择省/城市","北京市","上海市","天津市","重庆市","深圳市","广东省"];
var arr_city = [
["请选择城市/地区"],
["东城区","西城区","朝阳区","宣武区","昌平区","大兴区","丰台区","海淀区"],
['宝山区','长宁区','丰贤区', '虹口区','黄浦区','青浦区','南汇区','徐汇区','卢湾区'],
['和平区', '河西区', '南开区', '河北区', '河东区', '红桥区', '塘古区', '开发区'],
['俞中区', '南岸区', '江北区', '沙坪坝区', '九龙坡区', '渝北区', '大渡口区', '北碚区'],
['福田区', '罗湖区', '盐田区', '宝安区', '龙岗区', '南山区', '深圳周边'],
['广州市','惠州市','汕头市','珠海市','佛山市','中山市','东莞市']
];
//二级联动初始化
function init()
{
//获取name=province和name=city的元素对象
var province = document.form1.province;
var city = document.form1.city;
//指定province中<option>标记的个数,添加多少个空的<option>标记
var len = arr_province.length;
province.length = len;
//循环写入省份数据
for(var i=0;i<len;i++)
{
province.options[i].text = arr_province[i];
province.options[i].value = arr_province[i];
}
//更改省份的默认选择项
var index = 3;
province.selectedIndex = index;
//********************************************************************
//指定city中<option>标记的个数,添加多少个空的<option>标记
var len = arr_city[index].length;
city.length = len;
//循环写入对应城市数据
for(var i=0;i<len;i++)
{
city.options[i].text = arr_city[index][i];
city.options[i].value = arr_city[index][i];
}
}
//当省份下拉列表被修改,相应城市列表中的数据也要相应变化
function change_select(index)
{
//获取name=city的元素对象
var city = document.form1.city;
//指定city中<option>标记的个数,添加多少个空的<option>标记
var len = arr_city[index].length;
city.length = len;
//循环写入对应城市数据
for(var i=0;i<len;i++)
{
city.options[i].text = arr_city[index][i];
city.options[i].value = arr_city[index][i];
}
}
</script>
</head>
<body onload="init()">
<form name="form1">
省份:<select name="province" onchange="change_select(this.selectedIndex)"></select>
城市:<select name="city"></select>
</form>
</body>
</html> |
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