[Seaside] Best way to guarantee a textInput will be a positive integer?

Gilles Schtickzelle gschtick at gmail.com
Tue Oct 26 19:18:42 UTC 2010

Thanks that was exactly what I was looking for!

On Tue, Oct 26, 2010 at 9:07 PM, Johan Brichau <johan at inceptive.be> wrote:

> Gilles,
> If you want to verify the input at the server-side when the form is
> submitted, here's roughly what it would look like (writing this off the top
> of my head):
> html form:[
>        html textInput
>                callback:[:val | [theInteger := val asInteger] on: Error
> do:[:e | anError := <do whatever you want> ]];
>                with: '';
>        html submitButton;
>        ]
> Essentially, you must catch the error inside the callback itself (or inside
> a method called from within the callback). When the callback is evaluated,
> the render method in which the callback is statically located is not on the
> execution stack.
> When Seaside has finished executing the callback, it will (automatically)
> restart the render loop for your application. At that point, you can decide
> to render the error message, display the form again, or anything else you
> want to do.
> Now, the example above uses traditional form submission. You might also
> want to do client-side verification using javascript, essentially not
> allowing to enter non-numeric characters in the input form, which is a
> completely different story. In addition, you might want to use ajax to
> submit the form and dynamically load an error message on the page.
> Also, in Pharo pre 1.2 and (presumably) in Squeak, this conversion will not
> throw an error if 'val' is not an integer. Instead, it will return nil. So,
> the actual code in the callback might differ depending on the platform you
> are using.
> I hope this answers your question
> Johan
> On 26 Oct 2010, at 17:00, Gilles Schtickzelle wrote:
> > Hello again,
> >
> > I have a form where some of the input field should only be filled with
> integer values. I try to test the value in the setter and throw an error
> when it's not an integer but I can't figure out how to catch the error in
> the renderContentOn method of my component, and something tells me it's not
> the correct way to do this.
> > Is there something like "integerInput" that would force an integer value
> instead of a textInput?
> >
> > Thanks,
> > Gilles _______________________________________________
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> > seaside at lists.squeakfoundation.org
> > http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside
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