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index.php
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<?php
require_once('config/config.php');
$select_country="SELECT * FROM country ORDER BY country_name ASC";
$res=mysqli_query($conn,$select_country);
$rowCount = mysqli_num_rows($res);
?>
<!DOCTYPE html>
<html lang="en">
<head>
<title>Dependent Dropdown by AJAX</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<style type="text/css">
body{
background-image: url('img/pic8.jpg');
background-size: cover;
background-repeat: no-repeat;
}
#form_box{
background-color: rgba(0,0,0,0.7);
padding: 15px;
margin-top: 100px;
border-radius: 10px;
box-shadow: 5px 5px 10px 10px white;
color: white;
}
</style>
</head>
<body>
<div class="container-fluid">
<div class="container">
<div class="row">
<div class="col-md-4"></div>
<div class="col-md-4" id="form_box">
<div class="form-group">
<label>Country:</label>
<select class="form-control" id="country" name="country">
<option value="">---SELECT COUNTRY---</option>
<?php
if($rowCount > 0){
while($row = mysqli_fetch_array($res)){
echo '<option value="'.$row['id'].'">'.$row['country_name'].'</option>';
}
}else{
echo '<option value="">Category not available</option>';
}
?>
</select>
</div>
<div class="form-group">
<label>State:</label>
<select class="form-control" id="state" name="country">
<option value="">---SELECT COUNTRY FIRST---</option>
</select>
</div>
<div class="form-group">
<label>City:</label>
<select class="form-control" id="city" name="country">
<option value="">---SELECT City---</option>
</select>
</div>
</div>
<div class="col-md-4"></div>
</div>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('#country').on('change',function(){
var countryID = $(this).val();
if(countryID){
$.ajax({
type:'POST',
url:'fetch_country.php',
data:'id='+countryID,
success:function(html){
$('#state').html(html);
}
});
}else{
$('#state').html('<option value="">Select category first</option>');
}
});
});
</script>
<script type="text/javascript">
$(document).ready(function(){
$('#state').on('change',function(){
var stateID = $(this).val();
if(stateID){
$.ajax({
type:'POST',
url:'fetch_city.php',
data:'id='+stateID,
success:function(html){
$('#city').html(html);
}
});
}else{
$('#city').html('<option value="">Select State first</option>');
}
});
});
</script>
</body>
</html>