本文實例講述了javascript基于DOM實現省市級聯下拉框的方法。分享給大家供大家參考。具體實現方法如下：
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>省市級聯下拉框</title><script type="text/javascript">var provs = { "江西省": ["南昌市", "景德鎮", "九江", "鷹潭", "萍鄉", "新馀", "贛州", "吉安", "宜春", "撫州", "上饒"], "福建省": ["福州", "廈門", "莆田", "三明", "泉州", "漳州", "南平", "龍巖", "寧德"], "河北省": ["石家莊", "邯鄲", "邢臺", "保定", "張家口", "承德", "廊坊", "唐山", "秦皇島", "滄州", "衡水"]};function loadProv() { //加載省份數據 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; //如果沒有選擇省份，則把城市下拉框隱藏 if (provName == "none") { city.style.display = "none"; return; } else { city.style.display = ""; } var citys = provs[provName]; //city.options.length = 0; //用這種方法也可以清空原始列表 //清空城市的原始數據 for (var i = city.childNodes.length - 1; i >= 0; i--) { var child = city.childNodes[i]; city.removeChild(child); } //添加新的城市數據 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">請選擇省</option></select><select id="city" style="display:none"></select></body></html>希望本文所述對大家的javascript程序設計有所幫助。
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