javascript的下拉菜单

来源：互联网发布：贾希尔奥卡福体测数据编辑：程序博客网时间：2024/04/25 04:31

<!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" xml:lang="zh-cn">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>网页标题</title>
<meta name="keywords" content="关键字列表" />
<meta name="description" content="网页描述" />
<link rel="stylesheet" type="text/css" href="" />
<style type="text/css"></style>

</head>
<body>

省份：<select id="province"></select>
城市：<select id="city"><option>请选择省/城市</option></select>
</body>
</html>
<script type="text/javascript">
//先创建出两个省份和城市两个数组
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","河南省"];
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', '塘沽区', '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'],
['郑州市']
];
//获得下拉框省份的id
var pro_obj =document.getElementById("province");
var len =pro_obj.length=arr_province.length;
//遍历获取option.text的内容
for(var i=0;i<len;i++){
pro_obj.options[i].text=arr_province[i];
}
//获得下拉框城市的id
pro_obj.onchange =function (){

//获得省份所选择的option的下标
var city_obj =document.getElementById("city");
var city_ind =pro_obj.selectedIndex;
var city_len =city_obj.length =arr_city[city_ind].length;

//遍历
for(var j =0 ;j<city_len;j++){
//记住别忘了text
city_obj.options[j].text=arr_city[city_ind][j];

}
}

</script>

效果图如下

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