302 redirect when updating the cart via Ajax using Craft Commerce 2

Question

I'm working on a site that has recently migrated from Craft v2 with Commerce v1 to Craft v3 with Commerce v2.

Using Commerce v1 I was able to update the cart via Ajax and get a data object with the state of the cart as a response.

After updating to Craft Commerce v2 the ajax requests fail, returning Status 302 - Redirect instead of the data object, although the changes to the cart are successful.

I can add one or more products or change their quantity via Ajax, however, I need the data object in order to properly update the state of the cart without reloading the page.

• I'm running Craft v3.0.10.2 with Craft Commerce from dev-develop commit 1db58f6 on a machine running PHP v7.1.12
• The action I'm using is commerce/cart/update-cart
• The method of all requests is POST
• Any form data should to be ok since the cart updates succesfully
• All requests are sent with the following headers: Content-Type: application/x-www-form-urlencoded; charset=UTF-8 X-Requested-With: XMLHttpRequest

I'm I missing anything new in CC2? Any help would be much appreciated.

Answer 1

The function contains this

if ($request->getAcceptsJson()) {

Thus you'll need to set the dataType in your ajax request to json or text/json in order to not get redirected. If you didn't set it correctly Craft will treat it as a normal post request instead of an ajax request