Home > Article > Web Front-end > ajax three-level linkage implementation code

ajax three-level linkage implementation code

亚连Original: 2018-05-22 14:32:401195browse

This article mainly introduces the implementation code of ajax three-level linkage in detail. It has certain reference value. Interested friends can refer to it.

The example in this article shares with everyone the ajax three-level linkage code. The specific code for linkage display is for your reference. The specific content is as follows

1. test.php

<script src="../jquery-1.11.2.min.js"></script>
<script src="sanji.js"></script>
<title>无标题文档</title>
</head>

<body>
<h1>三级联动</h1>
<p id="sanji"></p>

</body>
</html>

2. sanji.js

// JavaScript Document
$(document).ready(function(e) {
 //找到ID=SANJI的p，造三个下拉扔进去
 $("#sanji").html("<select id=&#39;sheng&#39;></select><select id=&#39;shi&#39;></select><select id=&#39;qu&#39;></select>");
 
 //加载省的数据
 LoadSheng();
 //加载市的数据
 LoadShi();
 //加载区的数据
 LoadQu();
 
 //给省的下拉加点击事件
 $("#sheng").click(function(){
   //重新加载市
   LoadShi();
   //重新加载区
   LoadQu();
  })
 //给市的下拉加点击事件
 $("#shi").click(function(){
   //重新加载区
   LoadQu();
  })
 
});
//加载省份的方法
function LoadSheng()
{
 //省的父级代号
 var pcode = "0001";
 $.ajax({
  async:false,
  url:"chuli.php",
  data:{pcode:pcode},
  type:"POST",
  dataType:"TEXT",
  success: function(data){
   var hang = data.trim().split("|");
   var str = "";
   for(var i=0;i<hang.length;i++)
   {
    var lie = hang[i].split("^");
    str = str+"<option value=&#39;"+lie[0]+"&#39;>"+lie[1]+"</option>";
   }
   $("#sheng").html(str);
  }
 });
}
//加载市的方法
function LoadShi()
{
 //找市的父级代号
 var pcode = $("#sheng").val();
 $.ajax({
  async:false,
  url:"chuli.php",
  data:{pcode:pcode},
  type:"POST",
  dataType:"TEXT",
  success: function(data){
   var hang = data.trim().split("|");
   var str = "";
   for(var i=0;i<hang.length;i++)
   {
    var lie = hang[i].split("^");
    str = str+"<option value=&#39;"+lie[0]+"&#39;>"+lie[1]+"</option>";
   }
   $("#shi").html(str);
  }
 });
}

//加载区的方法
function LoadQu()
{
 //找区的父级代号
 var pcode = $("#shi").val();
 $.ajax({
  url:"chuli.php",
  data:{pcode:pcode},
  type:"POST",
  dataType:"TEXT",
  success: function(data){
   var hang = data.trim().split("|");
   var str = "";
   for(var i=0;i<hang.length;i++)
   {
    var lie = hang[i].split("^");
    str = str+"<option value=&#39;"+lie[0]+"&#39;>"+lie[1]+"</option>";
   }
   $("#qu").html(str);
  }
 });
}

3. chuli.php

<?php
//给一个父级代号，返回该父级代号下所有的子地区
require "DBDA.class.php";
$db=new DBDA();
$pcode=$_POST["pcode"];


$sql="select areacode,areaname from chinastates where parentareacode=&#39;{$pcode}&#39;";
echo $db->StrQuery($sql);

The method of returning a string in the quoted encapsulation class

<?php
class DBDA
{
 public $host = "localhost";
 public $uid = "root";
 public $pwd = "123";
 public $dbname = "test_123";
 //执行SQL语句返回相应的结果
 //$sql 要执行的SQL语句
 //$type 代表SQL语句的类型，0代表增删改，1代表查询
 function query($sql,$type=0)
 {
  $db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
  
  $result = $db->query($sql);
  
  if($type)
  {
   //如果是查询，显示数据
   return $result->fetch_all();
  }
  else
  {
   //如果是增删改，返回true或者false
   return $result;
  }
 }
 
 //返回字符串的方法
 public function strquery($sql,$type=1)
 {
  $db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
  $result = $db->query($sql);
  $arr = $result->fetch_all();
  $str="";
  foreach($arr as $v)
  {
   $str = $str.implode("^",$v)."|";
  }
  
  $str = substr($str,0,strlen($str)-1);
  return $str;

 }
 
 //返回JSON
 function JSONQuery($sql,$type=1)
 {
  $db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
  $r = $db->query($sql);
  
  if($type==1)
  {
   return json_encode($r->fetch_all(MYSQLI_ASSOC));
  }
  else
  {
   return $r;
  }
 }
}

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

ajax implements the function of loading data

##How to use ajax_Examples, ajax data processing

React ajax java implements the function of uploading pictures and previewing them (graphic tutorial)

The above is the detailed content of ajax three-level linkage implementation code. For more information, please follow other related articles on the PHP Chinese website!

Statement：

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Previous article：Detailed explanation of Vue syntax usage in webstormNext article：Detailed explanation of Vue syntax usage in webstorm

See more

ajax three-level linkage implementation code

Related articles