基本思想就是：在JS動態(tài)創(chuàng)建select控件的option,通過Ajax獲取在PHP從SQL數(shù)據(jù)庫獲取的省市區(qū)信息，代碼有點長，但很多都是類似的，例如JS中省、市、區(qū)獲取方法類似，PHP中通過參數(shù)不同執(zhí)行不同的select語句。
index.html代碼：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>省市區(qū)三級聯(lián)動</title>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<script src="scripts/thumbnails.js" type="text/javascript"></script>
</head>
<body>
<div id="description">
<select style="width:100px; " onchange="sech(this.id)" id="sheng">
<option value="province">請選擇省份</option>
</select>
<select onchange="sech(this.id)" id="shi">
<option value="city">請選擇市區(qū)</option>
</select>
<select id="xian">
<option value="county">請選擇縣鄉(xiāng)</option>
</select>
</div>
</div>
</body>
</html>
thumbnails.js代碼：
window.onload = getProvince;
function createRequest() {//Ajax于PHP交互需要對象
try {
request = new XMLHttpRequest();//創(chuàng)建一個新的請求對象;
} catch (tryMS) {
try {
request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (otherMS) {
try {
request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (failed) {
request = null;
}
}
}
return request;
}
function sech(id) {//省市改變時觸發(fā)，select的onchange事件
var aa = document.getElementById(id);
if(id=="sheng"){
getCity(aa.value);//這里aa.value為省的id
}
if(id=="shi")
{
getCounty(aa.value);//這里aa.value為市的id
}
}
function getProvince() {//獲取所有省
request = createRequest();
if (request == null) {
alert("Unable to create request");
return;
}
var url= "getDetails.php?ID=0";//ID=0時傳遞至PHP時讓其獲取所有省
request.open("GET", url, true);
request.onreadystatechange = displayProvince; //設置回調函數(shù)
request.send(null); //發(fā)送請求
}
function getCity(id){//獲取省對應的市
request = createRequest();
if (request == null) {
alert("Unable to create request");
return;
}
var url= "getDetails.php?ID=" + escape(id);
request.open("GET", url, true);
request.onreadystatechange = displayCity;
request.send(null);
}
function getCounty(id){//獲取市對應的區(qū)
request = createRequest();
if (request == null) {
alert("Unable to create request");
return;
}
var url= "getDetails.php?ID=" + escape(id);
request.open("GET", url, true);
request.onreadystatechange = displayCounty;
request.send(null);
}
function displayProvince() {//將獲取的數(shù)據(jù)動態(tài)增加至select
if (request.readyState == 4) {
if (request.status == 200) {
var a=new Array;
var b=request.responseText;//將PHP返回的數(shù)據(jù)賦值給b
a=b.split(",");//通過","將這一數(shù)據(jù)保存在數(shù)組a中
document.getElementById("sheng").length=1;
var obj=document.getElementById("sheng');
for(i=0;i
obj.options.add(new Option(a[i],i+1)); //動態(tài)生成OPTION加到select中，第一個參數(shù)為Text,第二個參數(shù)為Value值.
}
}
}
function displayCity() {//將獲取的數(shù)據(jù)動態(tài)增加至select
if (request.readyState == 4) {
if (request.status == 200) {
var a=new Array;
var b=request.responseText;
a=b.split(",");
document.getElementById("shi").length=1;//重新選擇
document.getElementById("xian").length=1;//重新選擇
if(document.getElementById("sheng").value!="province"){
var obj=document.getElementById('shi');
for(i=0;i
obj.options.add(new Option(a[i], document.getElementById("sheng").value*100+i+1)); //ocument.getElementById("sheng").value*100+i+1對應的是市的ID。
}
}
}
}
function displayCounty() {//將獲取的數(shù)據(jù)增加至select
if (request.readyState == 4) {
if (request.status == 200) {
var a=new Array;
var b=request.responseText;
a=b.split(",");
document.getElementById("xian").length=1;
if(document.getElementById("sheng").value!="province"&&document.getElementById("shi").value!="city"){
var obj=document.getElementById('xian');
for(i=0;i
obj.options.add(new Option(a[i],i+1001));
}
}
}
}
getDetails.php代碼：
<?php
header("Content-Type: text/html; charset=gb2312");
$conn = new COM("ADODB.Connection") or die("Cannot start ADO");
$connstr = "Provider=SQLOLEDB;Persist Security Info=False;User ID=root;Password=123456;Initial Catalog=area;Data Source=localhost";
if($_REQUEST['ID']==0){//獲得省列表
$conn->Open($connstr); //建立數(shù)據(jù)庫連接
$sqlstr = "select name from Province"; //設置查詢字符串
$rs = $conn->Execute($sqlstr); //執(zhí)行查詢獲得結果
$num_cols = $rs->Fields->Count(); //得到數(shù)據(jù)集列數(shù)
$Province=array();
$i=0;
while (!$rs->EOF) {
$Province[$i]=$rs->Fields['name']->Value.",";
$rs->MoveNext();
$i++;
}
foreach($Province as $val)
echo $val;
$conn->Close();
$rs = null;
$conn = null;
}
if($_REQUEST['ID']>0&&$_REQUEST['ID']<35){//獲得省對應的市列表
$conn->Open($connstr); //建立數(shù)據(jù)庫連接
$sqlstr = "select name from City where cid=".$_REQUEST['ID']; //設置查詢字符串
$rs = $conn->Execute($sqlstr); //執(zhí)行查詢獲得結果
$num_cols = $rs->Fields->Count(); //得到數(shù)據(jù)集列數(shù)
$City=array();
$i=0;
while (!$rs->EOF) {
$City[$i]=$rs->Fields['name']->Value.",";
$rs->MoveNext();
$i++;
}
foreach($City as $val)
echo $val;
$conn->Close();
$rs = null;
$conn = null;
}
if($_REQUEST['ID']>100){//獲得省市對應的縣列表
$conn->Open($connstr); //建立數(shù)據(jù)庫連接
$sqlstr = "select name from County where cid=".$_REQUEST['ID']; //設置查詢字符串
$rs = $conn->Execute($sqlstr); //執(zhí)行查詢獲得結果
$num_cols = $rs->Fields->Count(); //得到數(shù)據(jù)集列數(shù)
$County=array();
$i=0;
while (!$rs->EOF) {
$County[$i]=$rs->Fields['name']->Value.",";
$rs->MoveNext();
$i++;
}
foreach($County as $val)
echo $val;
$conn->Close();
$rs = null;
$conn = null;
}
?>
數(shù)據(jù)庫設計，表格Province表，City表，County表。
要求：Province表需要id和name，id建議從1至34，例如北京id為1，廣東id為2，以此類推；
City表需要id,name和cid，id為cid*100+1，cid為該市的上級，例如深圳的上級為廣東省,cid為2的話，深圳的id就是201，以此類推。
County表需要id,name和cid，因為是三級的關系，id可以隨意，建議從10001開始自增。cid為所在上級，例如寶安區(qū)的cid為201，龍崗區(qū)的cid也為201；
截圖：
HTML效果：
完成后效果：
備注：PHP是服務器端的，建議發(fā)布網站后通過ip調試。
