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#1 Dec. 30, 2010 00:00:47

Brandon T.
Registered: 2009-11-02
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Question about custom form widgets and validation

Hi everyone,

I'm working on a custom form widget to input length values in feet,
inches and a fraction of an inch. So far, everything is working as
expected, except for validation.

It takes a value input as:
1' 10 1/2" and converts it into inches: 22.5, for storage in a

My widget combines two text inputs and a select to create the decimal
value. So, I'm using a DecimalField and supplying my widget. However,
if I input a non-numeric value, I'm getting a ValueError in my
value_from_datadict method.

So, obviously I need a try/except in that method, but how do I go
about adding an error message to the field instead of raising a
runtime exception?

Once I get this finished, I'd like to add it to Django Snippets to


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