Re: takeValuesFromRequest question
Re: takeValuesFromRequest question
- Subject: Re: takeValuesFromRequest question
- From: email@hidden
- Date: Tue, 20 Sep 2005 15:24:02 +0200
----- Original Message -----
From: "Miguel Arroz" <email@hidden>
To: "WebObjects Development" <email@hidden>
Sent: Tuesday, September 20, 2005 3:04 PM
Subject: takeValuesFromRequest question
> Hi!
>
> First, sorry about posting so many basic question on this list...
> i'm really enjoying learning WO, and I want to know some details
> about the framework! :)
>
> I'm trying to define a component (called ErrorLabel) that might
> (or not) display an error. The ideia is to put an instance of
> ErrorLabel next to a TextField, button, etc, so that when the value
> the user introduces is wrong, and error label appears next to that
> element.
>
> I've learned that a component gets the values from the interface
> and sets them on the model object during the execution of
> takeValuesFromRequest. My ideia was to build validators on the model
> class, and catch the exceptions on the component.
This is good idea, WO has the following solution:
if you have property email then just create the method
public String validateEmail (String email )
{
// da any stuff here
return email ;
}
WO will execute this method everytime takeValuesFromRequest is called.
You create for every property a method.
HTH,
Sako.
>
> The problem is that the takeValuesFromRequest is catching all the
> exceptions, and printing error messages on the console, like
> "[2005-09-20 13:41:29 WEST] <WorkerThread3> Validation failed on an
> object [null] with keypath = publicTicket.email and exception: The
> email property of Ticket is not allowed to be null."
>
> How can I catch this exceptions, so that I may turn on the
> visibility of the error labels? Of course, I may redefine
> takeValuesFromRequest so that I grab all the values manually, and
> surround the code with a try/catch, but that looks lot a lot of
> pointless work, and lack of abstraction (if I need to add or remove a
> component, I will have to change that code manually). Following the
> "If you are writing code, you are doing something wrong" WebObjects
> non-official slogan, is there a better way to do this?
>
> Yours
>
> Miguel Arroz
>
> "We have no sympathy for the lost souls
> We've chosen the path of disgrace
> We give this life to our children
> And teach them to hate this place" -- Apocalyptica, Life Burns!
>
> Miguel Arroz
> http://www.ipragma.com
>
>
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