我寫的代碼，這一段最後一年，你需要的是使用AJAX，對change event。
請不是我寫了使用PDO我知道你需要mysqli的，但卻我沒有太多的時間來重新寫全 事情的mysqli我的解決方案
但我希望你將看到如何做到這一點的邏輯，希望你可以把它轉換自己沒有喧囂到mysqli的。
我的索引文件
<script src="jquery.min.js"></script>
<?php require 'db_config.php';?>
<script type="text/javascript">
$('#country').on('change', function() {
var countryID = $(this).val();
if (countryID) {
$.ajax({
type: 'POST',
url: 'locations.php',
data: 'country_id=' + countryID,
success: function(html) {
$('#state').html(html);
$('#city').html('<option value="">Select state first</option>');
}
});
} else {
$('#state').html('<option value="">Select country first</option>');
$('#city').html('<option value="">Select state first</option>');
}
$(this).remove('has-errors');
});
$('#state').on('change', function() {
var stateID = $(this).val();
if (stateID) {
$.ajax({
type: 'POST',
url: 'locations.php',
data: 'state=' + stateID,
success: function(html) {
$('#city').html(html);
}
});
} else {
$('#city').html('<option value="">Select city first</option>');
}
});
</script>
<form method="POST" action="" id="reg_form">
<select name="country" id="country" class="input">
<option value="0">Select country</option>
<?php
$stmt= $dbh->Prepare("SELECT countryID, countryName FROM countries ORDER BY countryName ASC");
$stmt->execute();
$results= $stmt->Fetchall(PDO::FETCH_ASSOC);
if(count($results) > 0){
foreach($results as $row){
echo '<option value="'.$row['countryID'].'">'.$row['countryName'].'</option>';
}
}else{
echo '<option value="">country not available</option>';
}
?>
</select>
<select name="state" id="state" class="input">
<option value="">Select country first</option>
</select>
<select name="city" id="city" class="input">
<option value="">Select state first</option>
</select>
</form>
locations.php
<?php
/**
* Created by PhpStorm.
* User: Masivuye
* Date: 2016/12/19
* Time: 11:27 AM
*/
require 'db_config.php';
if(isset($_POST["country_id"]) && !empty($_POST["country_id"])){
$sql=$dbh->prepare("SELECT DISTINCT states.stateID,states.stateName from states INNER JOIN countries ON states.countryID = ? ");
$sql->bindValue(1,$_POST['country_id']);
$sql->execute();
$results =$sql->fetchall(PDO::FETCH_ASSOC);
if(count($results) > 0){
echo '<option value="0">Select state</option>';
foreach($results as $row){
echo '<option value="'.$row['stateID'].'">'.$row['stateName'].'</option>';
}
}else{
echo '<option value="">state not available</option>';
}
}
if(isset($_POST["state"]) && !empty($_POST["state"])){
$sql=$dbh->prepare("SELECT DISTINCT cities.cityID,cities.cityName,cities.stateID from cities INNER JOIN states ON cities.stateID= ? ");
$sql->bindValue(1,$_POST['state']);
$sql->execute();
$results =$sql->fetchall(PDO::FETCH_ASSOC);
if(count($results) > 0){
echo '<option value="0">Select City</option>';
foreach($results as $row){
echo '<option value="'.$row['cityID'].'">'.$row['cityName'].'</option>';
}
}else{
echo '<option value="">city not available</option>';
}
}
?>
db_config.php
<?php
$servername = "localhost";
$username = "hidden";
$password = "hidden";
$dbname = "mytestDB";
try {
$dbh= new PDO("mysql:host=$servername;dbname=$dbname",$username,$password);
$dbh->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
echo "Could not connect".$e->getMessage();
error_log($e);
}
?>
我的表
CREATE TABLE IF NOT EXISTS `states` (
`stateID` int(6) NOT NULL AUTO_INCREMENT,
`stateName` varchar(255) NOT NULL,
`countryID` int(6) NOT NULL,
PRIMARY KEY (`stateID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
--
-- Dumping data for table `states`
--
INSERT INTO `states` (`stateID`, `stateName`, `countryID`) VALUES
(3, 'Western Cape', 2),
(4, 'Eastern Cape', 1),
(5, 'North West', 2),
(6, 'Northen Cape', 2);
--
-- Table structure for table `cities`
--
CREATE TABLE IF NOT EXISTS `cities` (
`cityID` int(6) NOT NULL AUTO_INCREMENT,
`cityName` varchar(255) NOT NULL,
`stateID` int(6) NOT NULL,
PRIMARY KEY (`cityID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
--
-- Dumping data for table `cities`
--
INSERT INTO `cities` (`cityID`, `cityName`, `stateID`) VALUES
(1, 'Cape Town', 3),
(2, 'East London', 4);
-- --------------------------------------------------------
--
-- Table structure for table `countries`
--
CREATE TABLE IF NOT EXISTS `countries` (
`countryID` int(6) NOT NULL AUTO_INCREMENT,
`countryName` varchar(255) NOT NULL,
PRIMARY KEY (`countryID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 ;
--
-- Dumping data for table `countries`
--
INSERT INTO `countries` (`countryID`, `countryName`) VALUES
(1, 'South Africa'),
(2, 'Zambia'),
(3, 'Zimbabwe '),
(4, 'Uganda'),
(5, 'USA'),
(6, 'Brazil'),
(7, 'India'),
(8, 'Austrilia'),
(9, 'Ghana');
-- --------------------------------------------------------
注意：使用您自己的字符集上的表，你可以使用UTF-8
希望這將指向你到正確的方向，也希望其他SO用戶將幫助地方我錯過了什麼。
我真的不明白這個問題。你能添加一些信息嗎？什麼不起作用？你想要發生什麼？編輯：我想你想過濾下一個選擇字段取決於之前的選擇？如果這就是你想要的，你必須使用AJAX。 –
我有這個解決方案，但我做了PDO –
你應該看看Ajax：使用JavaScript檢測選擇何時更改並向服務器發出請求以獲取其他選擇/數據。然後，根據從服務器返回的內容替換/修改過期的選擇。 – jeroen