Callback function php? - php

Question

I'm having trouble with my project. I am trying to post something to the database via jQuery, but there is something wrong in my code and I am unable to figure out what.
Basically, I have a form:
<form id="addCartForm" method="POST" action="callback/additemtocart.php">
</form>
Inside the file additemtocart.php I have the following code:
$item_id = $_POST['item_id'];
$brand_id = $_POST['brand_id'];
$category_id = $_POST['category_id'];
if(item_exists($item_id, $brand_id, $category_id, $_SESSION['user_id']))
{
$errors[] = 'this item is already in your cart';
}
else
{
//register the user
$item_data = array(
'user_id' => $_SESSION['user_id'],
'item_id' => $item_id,
'brand_id' => $brand_id,
'category_id' => $category_id
);
add_item_to_cart($item_data);
$cart[] = 'An item has been added to your cart!';
}
Once the user clicks on the item, I will execute the following code:
$(".cart_item").click(function(){
var name = $(this).attr("id");
var array = name.split("|");
var data = [];
data.push({"item_id": array[0]});
data.push({"brand_id": array[1]});
data.push({"category_id": array[2]});
$.post($("#addCartForm").attr("action"), data, function(info){
});
});
$("#addCartForm").submit(function(){
return false;
});
Is there something wrong with it?

Answer 1

Your code won't work the way you want it to.
Javascript/jQuery is executed client side, the PHP is executed server side. When the callback in jQuery is fired, there's no PHP server on the client to deal with this PHP you've got there.
What you want to do instead, is pass the array key and string as a parameter in the $.post, to the script on the server, which can then add the string to your errors array.
Like this:
data.push({"item_id", array[0]});
data.push({"brand_id", array[1]});
data.push({"category_id", array[2]});
data.push({"errors", "my error string"});
$.post($("#addCartForm").attr("action"), data, function(info){
//success message?
});
Then in the action script, you'll be able to check for the get parameter $_POST['errors'], and add it to your PHP errors array.
if(isset($_POST['errors']) && !empty($_POST['errors'])){
$errors = $_POST['errors'];
}
EDIT: That aside, given your edit, your error is that your array isn't defined, is it? You have arrays named array1 and array2 but you're then trying to access array[0], array[1] and array[2]. It should be array2[0], etc.