HTML5 option attribute: How to use the option attribute to implement a cascading drop-down list-H5 Tutorial-php.cn

HTML5 option attribute: How to use the option attribute to implement a cascading drop-down list

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Release： 2018-08-09 14:45:08

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This article introduces you to the option attribute of HTML5: how to use the option attribute to implement a cascading drop-down list. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

<!DOCTYPE>
<html>
<head>
<title>级联下拉列表</title>
<meta charset="UTF-8">
</head>
<body onload="load()">
<p>
<select class=&#39;prov&#39; id=&#39;prov&#39; onchange=&#39;changeCity()&#39;>
<option value=&#39;&#39;>--请选择省--</option>
</select>
<select class=&#39;city&#39; id=&#39;city&#39;>
<option value=&#39;&#39;>--请选择市--</option>
</select>
</p>
<script>
var province=document.getElementById("prov");
var city=document.getElementById("city");
var arr_prov=new Array(new Option("--请选择省--",&#39;&#39;),new Option("湖南","hn"),new Option("广东","gd"));
var arr_city=new Array();
arr_city[0]=new Array(new Option("--请选择市--",&#39;&#39;));
arr_city[1]=new Array(new Option("长沙",&#39;cs&#39;),new Option("娄底",&#39;ld&#39;),new Option("永州",&#39;yz&#39;));
arr_city[2]=new Array(new Option("广州",&#39;gz&#39;),new Option("深圳",&#39;sz&#39;)); //动态载入所有省份
function load(){ for(var i=0;i<arr_prov.length;i++){ province.options[i]=arr_prov[i]; } } //选中省份之后，根据索引动态载入相应城市 function changeCity(){
//清空上次的选项
city.options.length=0; //获取省一级的下拉列表选中的索引
var index=province.selectedIndex;
for(var i=0;i<arr_city[index].length;i++){
city.options[i]=arr_city[index][i];
} }
</script>
</body>
</html>

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