Backend DevelopmentPHP TutorialExample of realizing the three-level linkage function of provinces and municipalities (php+MySql+Ajax+jQuery)
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Use PHP+MySql+Ajax+jQuery to realize the three-level linkage function of provinces and municipalities
Requirements: Write a province The three-level linkage of urban area (or year, month and day) enables drop-down selection of region or time.
Implementation technology: php ajax
Implementation: When the provincial drop-down changes, the city drop-down area changes accordingly, and when the city-level drop-down changes, the zone drop-down changes accordingly.
Use chinastates table query
Ajax loading data
1. This is the chinastates table
##2. Make a simple php: Ajax_eg.php
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="bootstrap/js/jquery-1.11.2.min.js"></script>
</head>
<style>
.sanji{
margin-left: 550px;
margin-top: 150px;
}
</style>
<body>
<p class="sanji"> </p>
</body>
</html>
3. Make jquery based on the previous page: Ajax_ssq.js
// JavaScript Document
//当页面内容都加载完才执行
$(document).ready(function(e) {
//加载三个下拉列表
$("#sanji").html("<select id='sheng'></select><select id='shi'></select><select id='qu'></select>");
//加载显示数据
//1.加载省份
LoadSheng();
//2.加载市
LoadShi();
//3.加载区
LoadQu();
//当省份选中变化，重新加载市和区
$("#sheng").change(function(){ //当元素的值发生改变时，会发生 change 事件,该事件仅适用于文本域（text field），以及 textarea 和 select 元素。
//加载市
LoadShi();
//加载区
LoadQu();
})
//当市选中变化，重新加载区
$("#shi").change(function(){
//加载区
LoadQu();
})
});
//加载省份信息
function LoadSheng()
{
//取父级代号
var pcode ="0001";
//根据父级代号查数据
$.ajax({
//取消异步，也就是必须完成上面才能走下面
async:false,
url:"load.php",
data:{pcode:pcode},
type:"POST",
dataType:"JSON",
success: function(data){
var str="";
//遍历数组，把它放入sj
for(var k in data){
str=str+"<option value='"+data[k].[0]+"'>"+data[k].[1]+"</option>";
}
$("#sheng").html(str);
}
});
}
//加载市信息
function LoadShi()
{
//取父级代号
var pcode =$("#sheng").val();
//根据父级代号查数据
$.ajax({
//取消异步，也就是必须完成上面才能走下面
async:false,
url:"load.php",
data:{pcode:pcode},
type:"POST",
dataType:"JSON",
success: function(data){
var str="";
//遍历数组，把它放入sj
for(var k in data){
str=str+"<option value='"+data[k].[0]+"'>"+data[k].[0]+"</option>";
}
$("#shi").html(str);
}
});
}
//加载区信息
function LoadQu()
{
//取父级代号
var pcode =$("#shi").val();
//根据父级代号查数据
$.ajax({
//不需要取消异步
url:"load.php",
data:{pcode:pcode},
type:"POST",
dataType:"JSON",
success: function(data){
var str="";
//遍历数组，把它放入sj
for(var k in data){
str=str+"<option value='"+data[k].[0]+"'>"+data[k].[1]+"</option>";
}
$("#qu").html(str);
}
});
}
4. Connect the database again: load.php, reload DBDA with a method: JsonQuery
##
<?php
$pcode = $_POST["pcode"];
require_once "./DBDA.class.php";
$db = new DBDA();
$sql = "select * from chinastates where parentareacode='{$pcode}'";
echo $db->JsonQuery($sql,0);Encapsulation class
##<?php
class DBDA{
public $host="localhost";
public $uid="root";
public $pwd="";
public $dbname="0710_info";
/*
query方法:执行用户给的sql语句,并返回相应的结果
$sql:用户需要执行的sql语句
$type:用户需要执行的sql语句的类型
return:如果是增删语句改返回true或false,如果是查询语句返回二维数组
*/
public function query($sql,$type=1){//默认true为增删改
$db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
if(mysqli_connect_error()){
return "连接失败!";
}
$result = $db->query($sql);
if($type==1){
return $result;//增删改语句返回true或false
}else{
return $result->fetch_all();//查询语句返回二维数组
}
}
//此方法用于ajax中用于对取出的数据（二维数组）进行拼接字符串处理
public function StrQuery($sql,$type=1){
$db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
if(mysqli_connect_error()){
return "连接失败!";
}
$result = $db->query($sql);
if($type==1){
return $result;//增删改语句返回true或false
}else{
$arr = $result->fetch_all();//查询语句返回二维数组
$str = "";
foreach($arr as $v){
$str = $str.implode("^", $v)."|";
}
$str = substr($str, 0,strlen($str)-1);
return $str;
}
}
//此方法用于ajax中用于返回为json数据类型时使用
public function JsonQuery($sql,$type=1){
$db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
if(mysqli_connect_error()){
return "连接失败!";
}
$result = $db->query($sql);
if($type==1){
return $result;//增删改语句返回true或false
}else{
$arr = $result->fetch_all();//查询语句返回二维(关联)数组
return json_encode($arr);//将数组转换成json
}
}
}
Achievement effect:
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