Hi,
Wiadomość napisana w dniu 2010-03-31, o godz. 13:14, przez Roberto Aloi:
Hi all,
(<0.3201.0>) call wtype_date:validate({[{description,"Start date
(YYYYMMDD)"},
{format,"YYYYMMDD"},
{optional,{2010,3,29}}],
[]})
The validate function here is called with [] since the user didn't set
any value in the form.
In wtype_date.erl, the validate function is expecting the atom
"undefined" instead, to trigger the search of the optional value.
validate({Types, undefined}) ->
case wpart_valid:is_private(Types) of
true ->
{ok, undefined};
false ->
case lists:keysearch(optional, 1, Types) of
{value, {optional, Default}} ->
{ok, Default};
_ ->
{error, {empty_input, undefined}}
end
end;
The wype_date.erl should match:
validate({Types, []}) ->
Or am I missing something?
Well, it depends on what would you like to achieve.
In Erlang Web "optional" attribute is activated only when there is no
corresponding field on the form (HTML), thus no value is passed/sent
to the server. When no value is entered into the form, the field is
set to "" and the first validate function clause does not match.
The more I think about it, the more I am convinced to your way of
thinking (or just to keep both behaviours).
Roberto Aloi
--
University of Kent - Erlang Solutions Ltd.
Twitter: @prof3ta
Blog: http://aloiroberto.wordpress.com
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Cheers,
Michal Ptaszek
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