Re: Help: ensuring that a checkbox is checked

Vijay Ramachandran wrote:
> Hello.
> 
> I have a form with a checkbox (a terms of service), like this:
> 
> input id="tac_agree" name="tac_agree" type="checkbox" value="1" />
> 
> I would like to ensure that this box is checked in the validator schema. 
> What is the correct way to do this? I've tried many things - custom 
> validator which raises Invalid if the field is false, 
> validators.NotEmpty, chained_validators with a dummy field - nothing 
> seems to work. I am not able to propagate the Invalid exception back to 
> the front end, the Schema continues as though it didn't matter if 
> tac_agree was checked or not.

A little overly minimal, but you can do:

   class MySchema(Schema):
       tac_agree = String()

Since the checkbox will be missing from the input if it's not checked, 
so the lack of an if_missing in the validator should get it to trigger. 
  Maybe a better way would be:

   class MySchema(Schema):
       tac_agree = OneOf(['1'])

-- 
Ian Bicking : [email protected] : http://blog.ianbicking.org

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