JQuery Ajax Unlimited Dynamic Selectbox Based On Parent Categories
I have a table for category : | category_id | category_name | parent_id | 1 | Electronics | 0 | 2 | Mobile Phones | 1 | 3 | Computers | 1 | 4
Solution 1:
Please use below code 1)conf.php
<?php
$conn = mysqli_connect('localhost','root','root','test') or die(mysqli_error($conn));?>
2)category-dropdown.php
<?php
include 'conf.php';
$query = 'SELECT * FROM category WHERE parent_id=0';
$result = mysqli_query($conn,$query);
$data = $result->fetch_all(MYSQLI_ASSOC);
?>
<!DOCTYPE html>
<html lang="en">
<head>
<title>MultiDropdown</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-4">
<select name="category" class="form-control category">
<option value="">Select</option>
<?php
foreach($data as $d){
echo '<option value="'.$d['id'].'">'.$d['category'].'</option>';
}
?>
</select>
</div>
</div>
<div id="dropdown_container"></div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"> </script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script>
$(document).ready(function(){
$(document).on('change','.category',function(){
var id = $(this).val();
$.ajax({
url:'getcategory.php',
type:'post',
data:{'id':id},
success:function(data){
//alert(data);
$('#dropdown_container').append(data);
}
})
});
});
</script>
</body>
</html>
3)getcategory.php
<?php
include 'conf.php';
if(isset($_POST['id'])){
$id= $_POST['id'];
$query = 'SELECT * FROM category WHERE parent_id = '.$id;
$result = mysqli_query($conn,$query);
$data = $result->fetch_all(MYSQLI_ASSOC);
if(!empty($data)){
echo '<div class="row">
<div class="col-md-4">
<select name="category" class="form-control category">
<option value="">Select</option>';
foreach($data as $d){
echo '<option value="'.$d['id'].'">'.$d['category'].'</option>';
}
echo '</select>
</div>
</div>';
}
}
?>
Solution 2:
To find the unlimited sub-cats should be no problem: (I m not sure why you have this problem as you said you have no problem in coding)
For unlimited sub-cats you simply calling the same SQL to return sub-cats or null:
SELECT * FROM category WHERE parent_id = ?
The following is off-topic --------------
It might need a little bit energy if you want to show all products of a selected category and its all children.
You might need change your design to:
id category
------ ----------
11 Electronics
1101 Mobile Phones
1102 Computers
110101 Iphone
110102 Samsung Galaxy
110201 Asus Laptop
For above design max 99 child, if you need more, you might increase to 3-digits, etc
case study: find all products that are in category 11 and all its children:
SELECT * FROM products WHERE category_id like '11%'
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