Example of realizing the three-level linkage function of provinces and municipalities (php+MySql+Ajax+jQuery)-PHP Tutorial-php.cn

Example of realizing the three-level linkage function of provinces and municipalities (php+MySql+Ajax+jQuery)

黄舟

Release： 2023-03-16 07:32:02

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The following editor will bring you an example of using PHP+MySql+Ajax+jQuery to realize the three-level linkage function of provinces and municipalities. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.

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>

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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=&#39;sheng&#39;></select><select id=&#39;shi&#39;></select><select id=&#39;qu&#39;></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=&#39;"+data[k].[0]+"&#39;>"+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=&#39;"+data[k].[0]+"&#39;>"+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=&#39;"+data[k].[0]+"&#39;>"+data[k].[1]+"</option>";       
      }
      $("#qu").html(str);      
    }      
  }); 
}

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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();

$sql = "select * from chinastates where parentareacode=&#39;{$pcode}&#39;";
echo $db->JsonQuery($sql,0);

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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
  } 
 }
}

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