The Form API Workflow
summary
Step through the actual Form API request lifecycle from build to final response: Form API Internal Workflow shows five stages—retrieve/prepare, recursive build, validate, submit, reveal—with specific handlers called and when form_state values persist to the DB. Examples include process callbacks expanding a single date element into three (core uses >100) and after_build hooks (core uses <10). Covers cache/persistence, Ajax return of commands, and the rule: Ajax callbacks must not mutate the form.
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chapters (8)
- 0:00Introduction to Form API
- 1:56What is the Form API
- 4:47Simplified workflow
- 9:53Detailed workflow stages
- 23:29Cache and persistence
- 25:41AJAX requests handling
- 29:14Complete workflow illustration
- 31:01Key takeaways
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