javascript基于DOM实现省市级联下拉框的方法
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:
<htmlxmlns="http://www.w3.org/1999/xhtml"> <head> <metahttp-equiv="Content-Type"content="text/html;charset=utf-8"/> <title>省市级联下拉框</title> <scripttype="text/javascript"> varprovs={"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"] }; functionloadProv(){ //加载省份数据 varprov=document.getElementById("prov"); for(varkeyinprovs){ varprovName=key; varoptProv=document.createElement("option"); optProv.value=provName; optProv.innerText=provName; prov.appendChild(optProv); } } functionprovChange(){ varprov=document.getElementById("prov"); varcity=document.getElementById("city"); varprovName=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=""; } varcitys=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(vari=city.childNodes.length-1;i>=0;i--){ varchild=city.childNodes[i]; city.removeChild(child); } //添加新的城市数据 for(vari=0;i<citys.length;i++){ varoptCity=document.createElement("option"); optCity.value=citys[i]; optCity.innerText=citys[i]; city.appendChild(optCity); } } </script> </head> <bodyonload="loadProv()"> <selectid="prov"onchange="provChange()"> <optionvalue="none">请选择省</option> </select> <selectid="city"style="display:none"></select> </body> </html>
希望本文所述对大家的javascript程序设计有所帮助。