我正在创建 2 个动态下拉列表，第二个是基于第一个的选择，但问题是第二个没有填充，我不知道错误在哪里，谁能帮助我？？？？
数据库配置文件
<?php
$host = "localhost";
$user = "*****";
$password = "****";
$db = "lam_el_chamel_db";
?>
选择.php
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("select#district").attr("disabled","disabled");
$("select#governorate").change(function(){
$("select#district").attr("disabled","disabled");
$("select#district").html("<option>wait...</option>");
var id = $("select#governorate option:selected").attr('value');
$.post("select_district.php", {id:id}, function(data){
$("select#district").removeAttr("disabled");
$("select#district").html(data);
});
});
$("form#select_form").submit(function(){
var cat = $("select#governorate option:selected").attr('value');
var type = $("select#district option:selected").attr('value');
if(cat>0 && type>0)
{
var result = $("select#district option:selected").html();
$("#result").html('your choice: '+result);
}
else
{
$("#result").html("you must choose two options!");
}
return false;
});
});
</script>
</head>
<body>
<?php include "select.class.php"; ?>
<form id="select_form">
Choose a governorate:<br />
<select id="governorate">
<?php echo $opt->ShowGovernorate(); ?>
</select>
<br /><br />
choose a district:<br />
<select id="type">
<option value="0">choose...</option>
</select>
<br /><br />
<input type="submit" value="confirm" />
</form>
<div id="result"></div>
</body>
</html>
选择类.php
<?php
class SelectList
{
protected $conn;
public function __construct()
{
$this->DbConnect();
}
protected function DbConnect()
{
include "dbconfig.php";
$this->conn = mysql_connect($host,$user,$password) OR die("Unable to connect to the database");
mysql_select_db($db,$this->conn) OR die("can not select the database $db");
return TRUE;
}
public function ShowGovernorate()
{
$sql = "SELECT * FROM governorate";
$res = mysql_query($sql,$this->conn);
$governorate = '<option value="0">choose...</option>';
while($row = mysql_fetch_array($res))
{
$governorate .= '<option value="' . $row['governorate_id'] . '">' . $row['governorate_name'] . '</option>';
}
return $governorate;
}
public function ShowDistrict()
{
$sql = "SELECT * FROM districts WHERE governorate_id=$_POST[id]";
$res = mysql_query($sql,$this->conn);
$district = '<option value="0">choose...</option>';
while($row = mysql_fetch_array($res))
{
$district .= '<option value="' . $row['district_id'] . '">' . $row['district_name'] . '</option>';
}
return $district;
}
}
$opt = new SelectList();
?>
选择_type.php
<?php
include "select.class.php";
echo $opt->ShowDistrict();
?>
表结构
省：
- 省ID
- 省名
地区：
- 区号，
- 区名，
- 省ID。