Conditional validation

[mingan]

Is it possible to validate a field only if another field has a specific value, e.g. don't validate e-mail if the user prefers to be contacted by a phone?

[etaque]

Yes, you can use andThen for that, see gist from this issue:
#49 (comment)
https://gist.github.com/nmk/e9fd97dd1a62c04fc52545fec5a9b4ef#file-main-elm-L70-L84

That said, I think I should remove validate from model and ask it on Form.update, that would allow to generate the validation from current model, be it form or other fields.

[igray]

I'd like to +1 on asking for validate on Form.update. This would also provide for server-side validation, which seems to be alluded to here but couldn't actually work because you can't pass in any current context into that method. Unless I'm missing something?

[etaque]

You're not missing anything, this asyncCheck function is useless!
I'm pretty much sold on the validate in Form.update, just need to decide when I'll do that. I already did a major release a few weeks ago for 0.18, but hey, version numbers are cheap :)

[etaque]

FYI validation has been removed from model in master, release coming soon.