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js实现 多级联动
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta charset="utf-8">
<title>dispatchEvent示例用法</title>
<script type="text/javascript">
var provinces = new Array();
provinces["陕西"] = ["西安","咸阳","宝鸡","延安","汉中"];
provinces["台湾"] = ["台北","台中","台南"];
provinces["浙江"] = ["杭州","宁波","绍兴","温州"];
console.log(provinces);function provinceChange()
{
console.log("onChange is triggered.");
var prov = document.getElementById("province").value;
var cityObj = document.getElementById("city");
cityObj.options.length =;
for(var i in provinces[prov])
{
cityObj.options.add(new Option(provinces[prov][i],provinces[prov][i]));
}
}
window.onload = function(){
var provinceObj = document.getElementById("province");
for(var index in provinces)
{
provinceObj.options.add(new Option(index,index));
} var event = document.createEvent('HTMLEvents');
event.initEvent("change", true, true);
event.eventType = 'message';
provinceObj.dispatchEvent(event);
};
</script>
</head>
<body>
省份:<select id="province" onchange= "provinceChange()"></select>
城市:<select id="city"></select>
</body>
</html>
