本文实例讲述了javascript基于DOM实现省市级联下拉框的方法。分享给大家供大家参考。具体实现方法如下：
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>省市级联下拉框</title> <script type="text/javascript"> var provs = { "江西省": ["南昌市", "景德镇", "九江", "鹰潭", "萍乡", "新馀", "赣州", "吉安", "宜春", "抚州", "上饶"], "福建省": ["福州", "厦门", "莆田", "三明", "泉州", "漳州", "南平", "龙岩", "宁德"], "河北省": ["石家庄", "邯郸", "邢台", "保定", "张家口", "承德", "廊坊", "唐山", "秦皇岛", "沧州", "衡水"] }; function loadProv() { //加载省份数据 var prov = document.getElementById("prov"); for (var key in provs) { var provName = key; var optProv = document.createElement("option"); optProv.value = provName; optProv.innerText = provName; prov.appendChild(optProv); } } function provChange() { var prov = document.getElementById("prov"); var city = document.getElementById("city"); var provName = prov.value; //如果没有选择省份，则把城市下拉框隐藏 if (provName == "none") { city.style.display = "none"; return; } else { city.style.display = ""; } var citys = provs[provName]; //city.options.length = 0; //用这种方法也可以清空原始列表 //清空城市的原始数据 for (var i = city.childNodes.length - 1; i >= 0; i--) { var child = city.childNodes[i]; city.removeChild(child); } //添加新的城市数据 for (var i = 0; i < citys.length; i++) { var optCity = document.createElement("option"); optCity.value = citys[i]; optCity.innerText = citys[i]; city.appendChild(optCity); } } </script> </head> <body onload="loadProv()"> <select id="prov" onchange="provChange()"> <option value="none">请选择省</option> </select> <select id="city"></select> </body> </html>
希望本文所述对大家的javascript程序设计有所帮助。
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