ajax three-level linkage implementation code
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='sheng'></select><select id='shi'></select><select id='qu'></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='"+lie[0]+"'>"+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='"+lie[0]+"'>"+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='"+lie[0]+"'>"+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"];
$sql="select areacode,areaname from chinastates where parentareacode='{$pcode}'";
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.
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