[Feature request] Global/root form error, independent of form fields

[bennettdams]

Hey!
I think it would be nice to have a global/root form error that you can show next to the form.

Imagine a user submits its form, (client) validation is successful, request is sent to the backend. But something goes wrong (network, business logic, etc.), so we'll e.g. get a 400 response.
For such, I want to show a message next to the form.

You could obviously do this yourself, but then you also have to keep track of the form's submissions, as the error may goes away after the next submit. So integrating it as part of the form would be nice.

The easiest solution in my head is to have a new reserved field on the FormApi, something like rootError. One should have the possibility to get and set the value and it should be reset on a submission.

If I understand correctly, some API-related changes will soon allow to set field errors from the onSubmit callback. But this feature request is something different.