Use validator in a dialog?

[vladdoster]

Hello prompt-toolkit team,

You all have created a great module and I really enjoy using it. Bravo!

However, I wish to add a validator to an input dialog, but, alas I'm and idiot and can't see to figure it out. I wish to not wrap it in a while loop. I see the Buffer class and assume it will be something having to do with that.

If we can figure it out together I will add it to examples and/or documentation. I think it would be valuable.

For my prompts I did this

    validator = functools.partial(new_limit_validator, input_type=input_type, curr_lim=curr_lim, op=op)
    validator = Validator.from_callable(validator, 
                                        error_message="New {0} limit must be {1} than {2}".format(name, op, curr_lim.humanized),
                                        move_cursor_to_end=True)
    new_limit_prompt = prompt(text="New {0} limit? format: {1}".format(name, fmt), 
                              validator=validator, 
                              validate_while_typing=False)

I have attempted instantiating a PromptSession object before hand to add my validator to but it isn't inherited by the dialog (makes sense).

Is there anyway I can do something similar with the dialog?

V/R
Vlad

[jonathanslenders]

Hi @vladdoster,

This change should make it possible: #1246

There's still an issue with the width of the dialog changing after the validation toolbar gets displayed, but that can be fixed.

[trevorbayless]

#1246 works when pressing Enter on an input_dialog, but the validator doesn't appear to be used when ok_button is selected.