Extension attribute on admin page

Question

I've successfully created a new field on the frontend with an extension_attribute by this documentation.

My problem is that where should I hook the extension attributes on the admin page?

The shipping method is set by Magento_Sales/order/create/scripts.js with the Adminorder.setShippingMethod mehod.

But this is a prototype file, I can not hook on it with mixin, since it has no return value.

How can I add/get the extension_attributes with my value?

Answer 1

I need to use the window.order in my javascript file instead of AdminOrder. It created from form.js.