As discussed first in #736298-21: Refactor file.module to use proper button click detection, enabling FAPI to improve button click detection security currently the FAPI first executes the value callback then the #process callback for input elements. But that way it's impossible to set the element value depending on the values of the child elements generated by the #process callback.

As of now this can be done in d7 by using an after build callback - but it's rather hard to do. See http://drupal.org/cvs?commit=353180 for how it can be done now.

I think the process callback should run before any values are assigned, that way the value callback can access the processed form element values of its children - which makes a lof of sense to me. Usually the form element value of a processed element depends on the values of its child element, so it does not make much sense to set it beforehand.

For that to work the #process callbacks in core need a clean up. Probably there is no cause to do is for d7 now, so setting to d8.

Comments

effulgentsia’s picture

Subscribing. I'm looking forward to the opportunity of a full major release cycle for us to rethink the entire FAPI architecture.

sun’s picture

Title: cleanup element processing and value assignment » Cleanup form element processing and value assignment
Issue tags: +API clean-up

We should discuss and agree on a new issue tag for all our major form/AJAX/entity refactoring for D8. (similar to the "D7 Form API Challenge" tag)

effulgentsia’s picture

D8 Form API Challenge?

jhedstrom’s picture

Issue summary: View changes
Status: Active » Postponed (maintainer needs more info)
Issue tags: +Needs issue summary update

The internals of form processing have changed drastically in 8.x, so if there's still more to be done, this needs clarification.

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smustgrave’s picture

Status: Postponed (maintainer needs more info) » Closed (outdated)

Closing as outdated since there has not been a follow since this issue moved to PNMI 7 years ago.