/** * ajax无刷新二级联动下拉菜单(省市联动) * * @author arcow * @version 1.0 * @lastupdate 2005-12-29 * */ var http_request = false; function send_request(url,method) {//初始化、指定处理函数、发送请求的函数 http_request = false; //开始初始化XMLHttpRequest对象 if(window.XMLHttpRequest) { //Mozilla 浏览器 http_request = new XMLHttpRequest(); if (http_request.overrideMimeType) {//设置MiME类别 http_request.overrideMimeType('text/xml'); } } else if (window.ActiveXObject) { // IE浏览器 try { http_request = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { try { http_request = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {} } } if (!http_request) { // 异常,创建对象实例失败 window.alert("不能创建XMLHttpRequest对象实例."); return false; } switch(method){ case 1: http_request.onreadystatechange = processRequest1;break;//选择操作函数 case 2: http_request.onreadystatechange = processRequest2;break; case 3: http_request.onreadystatechange = processRequest3;break; } // 确定发送请求的方式和URL以及是否同步执行下段代码 http_request.open("GET", url, true); http_request.send(null); } // 处理返回信息的函数 function processRequest1() {//操作函数1,调入省 if (http_request.readyState == 4) { // 判断对象状态 if (http_request.status == 200) { // 信息已经成功返回,开始处理信息 document.getElementById("statusTxt").innerHTML=""; addOptionGroup("province",http_request.responseText); } else { //页面不正常 alert("您所请求的页面有异常。"); } }else {//只要未读取完成 document.getElementById("statusTxt").innerHTML="正则读取数据中……"; } }
function processRequest2() {//操作函数2,调入市 if (http_request.readyState == 4) { // 判断对象状态 if (http_request.status == 200) { // 信息已经成功返回,开始处理信息 document.getElementById("statusTxt").innerHTML=""; addOptionGroup("city",http_request.responseText); } else { //页面不正常 alert("您所请求的页面有异常。"); } }else {//只要未读取完成 document.getElementById("statusTxt").innerHTML="正则读取数据中……"; } }
function processRequest3() {//操作函数3,输入省市 if (http_request.readyState == 4) { // 判断对象状态 if (http_request.status == 200) { // 信息已经成功返回,开始处理信息 document.getElementById("statusTxt").innerHTML=""; document.getElementById("district").value=http_request.responseText; } else { //页面不正常 alert("您所请求的页面有异常。"); } }else {//只要未读取完成 document.getElementById("statusTxt").innerHTML="正则读取数据中……"; } }
function loadProvince() {//载入省 send_request("select.server.php?action=province",1);//服务端处理程序,操作函数 }
function loadCity() {//载入市 document.getElementById("district").value="";//清空文本框 send_request("select.server.php?action=city&id="+document.getElementById("province").value,2); }
function inputDistrict() {//向文本框输入选定的省市
send_request("select.server.php?action=district&id="+document.getElementById("province").value+"&id1="+document.getElementById("city").value,3);
}
addOption.js
function addOption(objSelectNow,txt,val) { /// 使用W3C标准语法为SELECT添加Option var objOption = document.createElement("OPTION"); objOption.text= txt; objOption.value=val; objSelectNow.options.add(objOption); } function addOptionGroup(selectId,optGroupString) { var optGroup = optGroupString.split(",");
var objSelect = document.getElementsByTagName("SELECT"); var objSelectNow = objSelect[selectId]; objSelectNow.length = 1; /// 成组添加Options for (i=1; i { addOption(objSelectNow, optGroup[i], i); } }