I've got a controller that presents the user with a ckeditor field
that lets them use a limited set of html markup. The editor returns
an empty paragraph if they press Submit without typing anything, ie,
'<p></p>' , and my app needs to reject that. So I wrote a custom
validator as follows:
_striptags = re.compile(r'<[^<]*?/?>')
_nbsp = re.compile(r' ')
def isEmptyHtml(text):
""" Checks to see if text is empty after removing
HTML tags and leading/trailing whitespace incl. newlines.
"""
t = _striptags.sub('',text)
return 0 == len(_nbsp.sub('',t).strip())
class IS_NOT_EMPTY_HTML(Validator):
def __init__(self, error_message='Enter some text'):
debug('in __init__')
self.error_message = error_message
def __call__(self, value):
debug('value=%s'%value)
if isEmptyHtml(value):
debug('empty!')
return (value, self.error_message)
else:
debug('not empty')
return (value, None)
It's a little ugly, but it seems to do what I need and appears to work
correctly when I test it on the command line.
Now here's the problem. When I try to use it in a form, an instance
gets assigned to the field but the instance never gets called. I see
the log message from the __init__() method, but never the one from the
__call__() method. My controller is shown below.
def edititem():
---- <snip> ------
fields = [Field("edited", 'string', default=itemtext,
requires=IS_NOT_EMPTY_HTML(),
widget=ckeditor_basic,
)
]
form = SQLFORM.factory(*fields)
if form.accepts(request.vars, session):
session.flash = 'Edit accepted.'
----- etc ----
This one's really got me stumped. That usually means I've done
something brain dead and just can't see it.
I've spent over an hour carefully stepping into the calls with winpdb
and inspecting the variables along the way.
I've verified that
- field.requires ends up containing an <IS_NOT_EMPTY_HTML object
>
- the object is valid. I'm able to eval it in winpdb command line
with empty and non-empty strings.
I got kind of lost stepping through form.accepts and FORM.accepts in
sqlhtml.py but so far haven't spotted the place where it decides not
to call the requires method. What am I doing wrong? FWIW I'm
running web2py 1.92.
Thanks,
Mike
