JavaScript省市二级联动
cities.xml
<?xml version="1.0" encoding="GB2312"?> <china> <province name="吉林省"> <city>长春</city> <city>吉林市</city> <city>四平</city> <city>松原</city> <city>通化</city> </province> <province name="辽宁省"> <city>沈阳</city> <city>大连</city> <city>鞍山</city> <city>抚顺</city> </province> <province name="山东省"> <city>济南</city> <city>青岛</city> <city>威海</city> <city>烟台</city> <city>潍坊</city> </province> <province name="湖北省"> <city>武汉</city> <city>广水</city> <city>孝感</city> <city>荆州</city> <city>黄石</city> <city>鄂州</city> <city>黄冈</city> </province> </china>
city.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>二级联动</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body> <select id="province" > <option>--请选择--</option> <option value="湖北省">湖北省</option> <option value="吉林省">吉林省</option> <option value="辽宁省">辽宁省</option> <option value="山东省">山东省</option> </select> <select id="city"> <option>--请选择--</option> </select> </body> <script type="text/javascript"> document.getElementById("province").onchange=function(){ //当前选中的省 var provinceValue=this.value; var cityNode=document.getElementById("city"); //删除市下拉列表中的前一个省的城市项 var cityOptions=cityNode.getElementsByTagName("option"); for(var i=cityOptions.length-1;i>0;i--){ cityNode.removeChild(cityOptions[i]); } var xmlDoc=parseXML("cities.xml"); var xmlProvinceElements=xmlDoc.getElementsByTagName("province"); //下拉列表中添加选中省的城市项 for(var i=0;i<xmlProvinceElements.length;i++){ if(xmlProvinceElements[i].getAttribute("name")==provinceValue){ var xmlCityElements=xmlProvinceElements[i].getElementsByTagName("city"); for(var j=0;j<xmlCityElements.length;j++){ var xmlCityName=xmlCityElements[j].firstChild.nodeValue; var cityOptionElement=document.createElement("option"); cityOptionElement.setAttribute("value",xmlCityName); cityOptionElement.appendChild(document.createTextNode(xmlCityName)); cityNode.appendChild(cityOptionElement); } break; } } } /* * 加载XML文件 * @param {Object} filename */ function parseXML(filename){ try{ //Internet Explorer 创建一个空的xml文档 xmlDoc=new ActiveXObject("Microsoft.XMLDOM"); }catch(e){ // Firefox,Mozilla,Opera.... try { xmlDoc=document.implementation.createsDocument("","",null); }catch(e){} } //关闭异步加载 xmlDoc.async=false; //加载XML文档 xmlDoc.load(filename); return xmlDoc; } </script> </html>
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