I am going to be phasing out Drupal Commerce on our website in favor of a new custom built application that is hosted at another URL. Without completely rebuilding everything I am trying to override the Add to Cart form to redirect with POST data to the new app.

Using $form['#action'] I can redirect properly and dumping out shows something like this:

array(7) {
    string(1) "2"
    string(4) "8566"
    string(48) "form--90fc5Yp9qgp4CVFJlq03jfEZyYBkAhDX-j7E5g9oBQ"
    string(43) "T08Fl1dNHuI4BCZ4JuLNwxbw6gUTOfnodbc1zcQMR4E"
    string(35) "commerce_cart_add_to_cart_form_8566"
    array(1) {
        array(1) {
            array(1) {
                string(3) "yes"
        string(11) "Add to cart"

This is helpful but the product_id is useless as I need more info, like the SKU or a custom ID field I have on the product level. I can't seem to get this to provide me with the product info I need.

I initially tried using a custom submit handler instead but that didn't work. drupal_http_request isn't right as it just sends post data, does actually redirect with post data like action does.

So since setting the action works great, how would I alter this form to send more information during that step within hook_form_alter?

  • you can use commerce_product_load($product_id) to load product object, than you can retrieve any info see the fuction api.drupalhelp.net/api/commerce/…
    – berramou
    Nov 20, 2019 at 18:34
  • Yes sorry should have included that. I can use that no problem. However storing that information where it is added to post is a problem. Seems that add to cart only submits some information and not all the form data. Nov 20, 2019 at 19:51
  • the dump above is the $form_state or $form ?
    – berramou
    Nov 20, 2019 at 19:54
  • That dump is from my external site within $_REQUEST. Nov 20, 2019 at 19:55
  • I think you should add other fields to your form, in the hook_form_alter for example SKU $form['sky'] = array( '#type' => 'hidden', '#value' => YOUR_VALUE, ); as hidden fields and they will submitted with the form
    – berramou
    Nov 20, 2019 at 19:59

1 Answer 1


You can add other fields to your form as hiden, in the hook_form_alter for example add SKU field as hidden.

  $form['sky'] = [
    '#type'  => 'hidden',
    '#value' => YOUR_VALUE,

Hidden fields will submitted like others.

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