PHP+Ajax+JS省市区三级联动

2022-09-02 14:21:12

基本思想就是：在JS动态创建select控件的option,通过Ajax获取在PHP从SQL数据库获取的省市区信息，代码有点长，但很多都是类似的，例如JS中省、市、区获取方法类似，PHP中通过参数不同执行不同的select语句。

index.html代码：

<!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>PHP+Ajax获取SQL数据库</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">请选择省份</option>
</select>
<select onchange="sech(this.id)" id="shi">
<option value="city">请选择市区</option>
</select>
<select id="xian">
<option value="county">请选择县乡</option>
</select>
</div>

</div>
</body>
</html>

thumbnails.js代码：

window.onload = getProvince;

function createRequest() {//Ajax于PHP交互需要对象

try {

request = new XMLHttpRequest();//创建一个新的请求对象;

} 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) {//省市改变时触发，select的onchange事件

var aa = document.getElementById(id);

if(id=="sheng"){

getCity(aa.value);//这里aa.value为省的id

}

if(id=="shi")

{

getCounty(aa.value);//这里aa.value为市的id

}

function getProvince() {//获取所有省

request = createRequest();

if (request == null) {

alert("Unable to create request");

return;

}

var url= "getDetails.php?ID=0";//ID=0时传递至PHP时让其获取所有省

request.open("GET", url, true);

request.onreadystatechange = displayProvince; //设置回调函数

request.send(null); //发送请求

}

function getCity(id){//获取省对应的市

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){//获取市对应的区

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() {//将获取的数据动态增加至select

if (request.readyState == 4) {

if (request.status == 200) {

var a=new Array;

var b=request.responseText;//将PHP返回的数据赋值给b

a=b.split(",");//通过","将这一数据保存在数组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)); //动态生成OPTION加到select中，第一个参数为Text,第二个参数为Value值.

}

function displayCity() {//将获取的数据动态增加至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;//重新选择

document.getElementById("xian").length=1;//重新选择

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对应的是市的ID。

}

function displayCounty() {//将获取的数据增加至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代码：

<?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=sa;Password=zzh;Initial Catalog=NoteBook;Data Source=localhost";

if($_REQUEST[‘ID‘]==0){//获得省列表
$conn->Open($connstr); //建立数据库连接
$sqlstr = "select name from Province"; //设置查询字符串
$rs = $conn->Execute($sqlstr); //执行查询获得结果
$num_cols = $rs->Fields->Count(); //得到数据集列数
$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){//获得省对应的市列表
$conn->Open($connstr); //建立数据库连接
$sqlstr = "select name from City where cid=".$_REQUEST[‘ID‘]; //设置查询字符串
$rs = $conn->Execute($sqlstr); //执行查询获得结果
$num_cols = $rs->Fields->Count(); //得到数据集列数
$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){//获得省市对应的县列表
$conn->Open($connstr); //建立数据库连接
$sqlstr = "select name from County where cid=".$_REQUEST[‘ID‘]; //设置查询字符串
$rs = $conn->Execute($sqlstr); //执行查询获得结果
$num_cols = $rs->Fields->Count(); //得到数据集列数
$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;
}
?>