jquery_ajax 地址三级联动

jquery 的三级地址联动,原理与javascript类似,只是在触发请求的时候,使用封装好的 $.get ,$post,$.ajax 方法去执行,其余的都是一样的,后台服务器请求文件是一样的,前台html样式和方法也是一样的

1. 写一个 服务器文件  server_jquery.php ,如下:

 <?php
// 服务器连接
mysql_connect("localhost","root","root") or die(mysql_error());
// 数据库选定
mysql_select_db("ajax_demo");
// 字符编码设定
mysql_query("set names utf8");
$list = array();
// 判定请求的ID是不是省级请求,如果是,则执行sql数据库查询,调用对应的省级区域下面的城市
if(isset($_REQUEST['province_id'])){
$sql = "select * from ecs_region where parent_id=".$_REQUEST['province_id'];
$res = mysql_query($sql);
while( $row= mysql_fetch_assoc($res)){
array_push($list,$row);
};
// 将获取的数据转换成json 格式
echo json_encode($list);
// 判定请求的ID是不是城市级请求,如果是,则执行sql数据库查询,调用对应的城市区域下面的区县
}else if(isset($_REQUEST['city_id'])){
$sql = "select * from ecs_region where parent_id=".$_REQUEST['city_id'];
$res = mysql_query($sql);
while($row=mysql_fetch_assoc($res)){
array_push($list,$row);
}
// 将获取的数据转换成json 格式
echo json_encode($list);
};
?>

2. 使用$.get() 方法写请求文件:jquery_get_sanji.php

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<title>Document</title>
<script>
$(function(){
var Osheng = $("#province");
Osheng.on("change",function(){
var Id = $(this).val();
var url = "server_jquery.php";
$.get(url,{"province_id":Id},function(res){
var obj = JSON.parse(res);
var city = '';
var OCity = $("#city");
city = "<option value='0'>请选择城市</option>";
for(var i in obj){
city += "<option value='" + obj[i].region_id + "'>"+ obj[i].region_name + "</option>" ;
};
OCity.html( city );
});
});
var Ochengshi = $("#city");
Ochengshi.on('change',function(){
var Id = $(this).val();
var url = "server_jquery.php";
$.get(url,{"city_id":Id},function(res){
var obj = JSON.parse(res);
var district = '';
var Odistrict = $("#district");
district = "<option value='0'>请选择区域</option>";
for(var i in obj){
district += "<option value='"+ obj[i].region_id +"'>" + obj[i].region_name + "</option>";
};
Odistrict.html(district);
});
});
});
</script> </head>
<body>
<?php
mysql_connect("localhost","root","root") or die(mysql_error());
mysql_select_db("ajax_demo");
mysql_query("set names utf8");
?>
<select name="province" id="province">
<option value="0">请选择省份</option>
<?php
$sql = "select * from ecs_region where parent_id=1";
$res = mysql_query($sql);
while($row=mysql_fetch_assoc($res)){
?>
<option value="<?php echo $row['region_id'];?>"><?php echo $row['region_name']; ?></option>
<?php
}
?>
</select>
<select name="city" id="city">
<option value="0">请选择城市</option>
</select>
<select name="district" id="district">
<option value="0">请选择区县</option>
</select>
</body>
</html>

运行结果:

jquery_ajax 地址三级联动

3. 使用$.post()方法写请求文件:只是需要把 get 改成 post 就可以了,服务文件可以共用,因为在服务文件里,接受参数使用的是 $_REQUEST,它可以接受get 方式的数据,也可以接受post方式的数据

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<title>Document</title>
<script>
$(function(){
var Osheng = $("#province");
Osheng.on("change",function(){
var Id = $(this).val();
var url = "server_jquery.php";
$.post(url,{"province_id":Id},function(res){
var obj = JSON.parse(res);
var city = '';
var OCity = $("#city");
city = "<option value='0'>请选择城市</option>";
for(var i in obj){
city += "<option value='" + obj[i].region_id + "'>"+ obj[i].region_name + "</option>" ;
};
OCity.html( city );
});
});
var Ochengshi = $("#city");
Ochengshi.on('change',function(){
var Id = $(this).val();
var url = "server_jquery.php";
$.post(url,{"city_id":Id},function(res){
var obj = JSON.parse(res);
var district = '';
var Odistrict = $("#district");
district = "<option value='0'>请选择区域</option>";
for(var i in obj){
district += "<option value='"+ obj[i].region_id +"'>" + obj[i].region_name + "</option>";
};
Odistrict.html(district);
});
});
});
</script> </head>
<body>
<?php
mysql_connect("localhost","root","root") or die(mysql_error());
mysql_select_db("ajax_demo");
mysql_query("set names utf8");
?>
<select name="province" id="province">
<option value="0">请选择省份</option>
<?php
$sql = "select * from ecs_region where parent_id=1";
$res = mysql_query($sql);
while($row=mysql_fetch_assoc($res)){
?>
<option value="<?php echo $row['region_id'];?>"><?php echo $row['region_name']; ?></option>
<?php
}
?>
</select>
<select name="city" id="city">
<option value="0">请选择城市</option>
</select>
<select name="district" id="district">
<option value="0">请选择区县</option>
</select>
</body>
</html>

运行结果:

jquery_ajax 地址三级联动

4. 使用$.ajax() 方法请求文件:jquery_ajax_sanji.php

 <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<title>Document</title>
<script>
$(function(){
var Osheng = $("#province");
Osheng.on("change",function(){
var Id = $(this).val();
var url = "server_jquery.php";
$.ajax({
"url":url, // 请求地址
"type":"post", // 请求方式
"data":{ // 请求参数
"province_id":Id,
},
"dataType":"json", // 数据返回的格式
"success":function(obj){ // 请求成功执行的函数
var city = '';
var OCity = $("#city");
city = "<option value='0'>请选择城市</option>";
for(var i in obj){
city += "<option value='" + obj[i].region_id + "'>"+ obj[i].region_name + "</option>" ;
};
OCity.html( city );
}
})
});
var Ochengshi = $("#city");
Ochengshi.on('change',function(){
var Id = $(this).val();
var url = "server_jquery.php";
$.ajax({
"url":url, // 请求地址
"type":"post", // 请求方式
"data":{ // 请求参数
"city_id":Id,
},
"dataType":"json", // 数据返回的格式
"success": function(obj){ // 请求成功执行的函数
var district = '';
var Odistrict = $("#district");
district = "<option value='0'>请选择区域</option>";
for(var i in obj){
district += "<option value='"+ obj[i].region_id +"'>" + obj[i].region_name + "</option>";
};
Odistrict.html(district);
}
});
});
});
</script> </head>
<body>
<?php
mysql_connect("localhost","root","root") or die(mysql_error());
mysql_select_db("ajax_demo");
mysql_query("set names utf8");
?>
<select name="province" id="province">
<option value="0">请选择省份</option>
<?php
$sql = "select * from ecs_region where parent_id=1";
$res = mysql_query($sql);
while($row=mysql_fetch_assoc($res)){
?>
<option value="<?php echo $row['region_id'];?>"><?php echo $row['region_name']; ?></option>
<?php
}
?>
</select>
<select name="city" id="city">
<option value="0">请选择城市</option>
</select>
<select name="district" id="district">
<option value="0">请选择区县</option>
</select>
</body>
</html>

运行结果:

jquery_ajax 地址三级联动

在jquery ajax请求中,$.get(),$.post()都是$.ajax()方法的简写,这两种方式都可以使用ajax方法进行替换。$.ajax()请求提供的参数更多,更加全面

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