Re: Validation on my own

Hello,
thank you Kieran and Martino for your fast answers.

I also thought about Martino's solution. But I only want to do this as "last way", because there are more other parts in my software, I'll need that.

I think, that I'll order the book. I looked at the preview on amazon, and there are a view things, I want to learn.

But what can I do, until the book reach me? How can I display the messages, Wonder generates for me? At the moment, I have an accessor, which generates an alertMessage-script, which will be displayed, if alertMessage is set.

public String alertMessageScript() {
    	if(alertMessage==null) return null;
    	String tmp = alertMessage;
    	alertMessage=null;
    	return "<script language=\"javascript\" type=\"text/javascript\">"+
    			"alert('" + tmp + "');" +
    			"</script>";

    }

How can I display the messages, if I want to use the wonder-generated Validation-Messages?

Thanks
Peter M.


-------- Original-Nachricht --------
> Datum: Tue, 3 May 2011 08:51:53 -0400
> Von: Kieran Kelleher <[email protected]>
> An: [email protected], "Peter Müller" <[email protected]>
> Betreff: Re: Validation on my own

> You can implement custom validation by simply adding validation methods to
> any class that implements NSValidation interface.  
> 
> You can throw custom 'nice' message from your own Validation method.
> 
> Also, if you use Wonder, the default messages will be 'nice' and Wonder
> allows for nice localization too.
> 
> There is a bit for you to learn, but it will be worth it.
> 
> So for your user EO, you can add custom validation methods.
> 
> For example for your password logic below, this would normally be added in
> the EO class as sth like:
> 
>    public String validatePassword(Object aValue) throws
> NSValidation.ValidationException {
>         if (aValue == null || aValue.toString().length() < 5) {
>             throw new NSValidation.ValidationException("Password must be
> set and must contain at least 5 characters.");
>         }
>         return aValue.toString();
>     }
> 
> Your validate method gets called automatically in takeValuesFromRequest
> phase of request handling.
> 
> Your current approach will not work because you are validating in the
> invokeAction phase which comes after the takeValues phase.
> 
> There is a book written by a bourbon-loving fairly smart Canuck entitled
> "Practical WebObjects". Chapter 5 explains Validation in very easy to
> understand terms. If you read that, you will then know enough to be dangerous.
> ;-)
> 
> Regards, Kieran
> 
> 
> On May 3, 2011, at 8:31 AM, Peter Müller wrote:
> 
> > Hello WO-Community,
> > i've a coding-problem because WO does a job for me, I want to do on my
> own.
> > 
> > I've a modelclass called "User" with a view fields:
> > id, firstname, lastname, email, ...
> > 
> > id is primary key, firstname, lastname and a view others are "required"
> fields.
> > 
> > On my component I have a Form to set this fields. The "save"-Button is
> linked to my method:
> > 
> > public WOComponent save() {
> > 		alertMessage=null;
> > 		if(selectedUser.lastname()==null) {
> > 			alertMessage="Lastname of user must be set!";
> > 			return null;
> > 		}
> > 		if(selectedUser.firstname()==null) {
> > 			alertMessage="Firstname of user must be set!";
> > 			return null;
> > 		}
> > 		if(selectedUser.username()==null) {
> > 			alertMessage="Username of user must be set!";
> > 			return null;
> > 		}
> > 		if(selectedUser.password()==null ||
> selectedUser.password().length()<5) {
> > 			alertMessage="Password of user must be set and must contain at least
> 5 signs.";
> > 			return null;
> > 		}
> > 		session.defaultEditingContext().saveChanges();
> > 		selectedUser = null;
> > 		return null;
> > }
> > 
> > As you can see, I want to do the validation for the fields on my own
> (because I want to make a "nice" message to the user, and later also
> multilingual).
> > 
> > But now the problem: If I click "save" on my component, first the form
> will be set, and WO validates, if all required fields are set. If not, it
> will print a message in console and "reset" the fields. My validation will be
> ignored.
> > 
> > Have I any chance to validate "required" fields on my own, and ignore
> WO's validation?
> > 
> > Thank you very much,
> > All the best from germany
> > Peter M.
> > -- 
> > Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir
> > belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de
> 

-- 
NEU: FreePhone - kostenlos mobil telefonieren und surfen!			
Jetzt informieren: http://www.gmx.net/de/go/freephone