We had similar issue in our application. We had two different ways of adding data....in the grid or in a form view. So one model - two views. With Validation being coupled tightly with View, validation logic would be in two places - Grid column level AND FormItem level
To avoid this we did validation on the Model (actually in a VO which resides in a Model). Here is how we did it. In the constructor of VO, initialized ALL validators and added them to an Array. Made the data members 'private' and addded public setter/getters. Added errorString member variable to VO. In the setter method validated the data using a specific validator or in some cases called validateAll. Set/append the error message to errorString...(if multiple fields have erroneous data then error messages are appended) To show validation error in the view: Grid - Added a column to the left that would show an icon in case errorString was not empty. The icon shows errorString as Tooltip Form - On top of the form Showing/Hiding the same error icon used in the grid. With a toolTip that show actual error message -Haritha --- In [email protected], Richard Rodseth <rrods...@...> wrote: > > Whether or not the validation is done in the view or presentation model, > note that the framework classes like NumberValidator can be instantiated and > invoked in ActionScript. > > On Tue, Apr 14, 2009 at 9:49 AM, claudiu ursica <the_bran...@...>wrote: > > > > > > > Now the validation is triggered by the view but you can forward the actual > > validation to the presentationModel instance who actually does the > > validation ... so the view only display the info that comes from the model > > and that's it... > > > > C > > ------------------------------ > > *From:* Borek <bore...@...> > > *To:* [email protected] > > *Sent:* Tuesday, April 14, 2009 7:25:47 PM > > *Subject:* [flexcoders] Re: Validation in Model (rather than in View) > > > > How does the Presentation Model pattern help? > > > > --- In flexcod...@yahoogro ups.com <flexcoders%40yahoogroups.com>, claudiu > > ursica <the_braniak@ ...> wrote: > > > > > > Have a look a the presentaion model pattern maybe helps your cause... > > > > > > C > > > > > > > > > > > > > > > ____________ _________ _________ __ > > > From: Borek <borekbe@ > > > > To: flexcod...@yahoogro ups.com <flexcoders%40yahoogroups.com> > > > Sent: Tuesday, April 14, 2009 6:16:56 PM > > > Subject: [flexcoders] Validation in Model (rather than in View) > > > > > > > > > > > > > > > > > > Flex supports validation in the View layer quite well but the problem is > > that the validation rules should not be there at all. They belong to Model > > but I'm not sure how to implement that in Flex. > > > > > > I would like to be able to do something like this: > > > > > > [Required] > > > [String(minLength= "5")] > > > public var name : String; > > > > > > and then just have the TextInput in the View validated automatically. > > Silverlight + .NET RIA Services can work like that but is that possible in > > Flex where we don't have 2-way data binding? > > > > > > Thanks, > > > Borek > > > > > > > > > > > >
