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Consider this form:

test():
        form=FORM(LABEL("Username:",INPUT(_name="user_name",
                  requires=IS_NOT_EMPTY(error_message="test"))),
                  INPUT(_type='submit'))

This is the general approach to form validation:

if form.accepts(request.vars,session,formname='myform'):
        #option 1
    elif form.errors:
        #option 2

In option 2 you can:

a) rewrite error messages:

if form.errors.user_name: form.errors.user_name='oops!'

b) copy error messages in a dictionary

import copy
    myerrors=copy.copy(form.errors)

c) clear errors so that they are not displayed:

form.errors.clear()

Moreover

``form.components[0]`` is the LABEL object

``form.components[0].components[0]`` is "Username:"

``form.components[0].components[1]`` is the INPUT object

``form.components[0].components[1].attributes['requires']`` is the ``IS_NOT_EMPTY`` object.

Technically you can do:

form.components[0].components[1].attributes['requires'].error_message="oops!"

but this is not a good idea since it easy to get it wrong.

AlterEgo

old web2py blog

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