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DjangoCon US 2016

This presentation, by Kirt Gittens, is licensed under a Creative Commons Attribution ShareAlike 3.0

We'll look at a few core problems that we were able to solve with Django forms. Dynamic Field Creation: What if you don't know what fields should be present on a Django form until runtime?. Solutions: Viewing a form's fields as a data structure (convert a field definition to a dictionary) Manipulate self.fields on a form to dynamically add / remove forms from a field. Pitfalls: A fields validated attributes can't be manipulated dynamically because of Validators within the forms API. Dynamic form layouts become difficult to manage, crispyforms does not scale as a solution! Validate a form via an API: How can external validations behave the same as internal errors? Solutions: form.clean() can be used for form wide errors, and form.add_error can be used to integrate those external validation errors into your existing form so that calls like is_valid() still work as expected with your external validations. Adding fields at runtime: How can the user add fields to a form after it has been rendered? Solutions: Javascript can be used for the UI, and if the fields are properly named, the same validations will work as long as the fields are part of the form. Pitfalls: Creating a solution that creates a dynamic field that is validated, but doesn't render can cause issues with your layout solution (crispyforms fails again here)

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