[Seaside] Re: seaside Digest, Vol 68, Issue 38

[r00t uk]

Thanks James for the response and welcome! :)

I went back to the #callback: style and used #setFocus in both methods for
testing.  With "...html textInput setFocus;...." present in both methods I
know longer get a stack trace, but the focus ends up on the last receiver.
So definitely has something to do with #setFocus not being present.  I then
re-wrote the methods using #on:of: style (see below), with #setFocus present
in both, one or neither of the methods. It worked in all 3 scenarios and
there are no cascades present.

renderCompanyTextInputOn: html
    self
        renderLabel: 'Company Name: '
        input: [
            html textInput on: #companyName of: self headDataModelView]
        output: self headDataModelView companyName
        on: html.

renderEmployeeTextInputOn: html
    self
        renderLabel: 'Employee Name: '
        input: [
            html textInput setFocus on: #employeeName of: self
headDataModelView]
        output: self headDataModelView employeeName
        on: html.

The Seaside examples, which I used as references, can be found in
Seaside-Tests-Functional WAInputElementContainer>>renderTextInputOn:,
WAInputElementContainer>>renderTextInputExampleOn: etc. but these work.

Anyway, I will move forward using the #on:of: as these work and appear to
achieve the same as the #callback: method.

Thanks for the help.

Regards
Adrian


>
> Message: 7
> Date: Sat, 30 Aug 2008 22:05:41 +0200
> From: James Foster <Smalltalk at JGFoster.net>
> Subject: Re: [Seaside] Newbie question
> To: Seaside - general discussion <seaside at lists.squeakfoundation.org>
> Message-ID: <B7D0654B-53B8-4A3C-B213-7691536A8825 at JGFoster.net>
> Content-Type: text/plain; charset="us-ascii"
>
> Hi Adrian,
>
> I haven't tried your code myself, but a brief visual scan suggests at
> least one problem that I've identified below...
>
> On Aug 30, 2008, at 9:32 PM, r00t uk wrote:
>
> > Hello All
> >
> > I am slowly working my way through Squeak and Seaside using "An
> > Introduction to Seaside" and the Seaside examples as my learning
> > guides.  I have come across an issue which I don't understand, and I
> > am hoping someone could enlighten me as to what is going wrong.  The
> > two methods below are called by
> > MLHeadDataModelView>>renderContentOn:,  with
> > MLHeadDataModelView>>renderCompanyTextInputOn: resulting in a
> > MessageNotUnderstood: WARenderCanvas>>value: error.
> >
> > The instance methods are:
> >
> > MLHeadDataModelView>>renderCompanyTextInputOn: "This method
> > generates the 'MessageNotUnderstood: WARenderCanvas>>value:' error"
> > self
> >         renderLabel: 'Company Name: '
> >         input: [
> >             html textInput;
> >             value: self headDataModelView companyName;
> >             callback: [:value | self headDataModelView companyName:
> > value]]
> >         output: self headDataModelView companyName
> >         on: html.
> >
> > MLHeadDataModelView>>renderEmployeeTextInputOn:
> > self
> >         renderLabel: 'Employee Name: '
> >         input: [
> >             html textInput setFocus;
>
> In Smalltalk the semantics of a cascade (indicated by the semi-colon)
> means that the following #value: message is being sent to the receiver
> of the last message. The last message is #setFocus, and the receiver
> of the #setFocus was the object returned by the #textInput message.
> Thus, #value: is being sent to a WATextInputTag (or similar object),
> not to the WARenderCanvas (which is probably what you really wanted).
>
> >             value: self headDataModelView employeeName;
> >             callback: [:value | self headDataModelView employeeName:
> > value]]
> >         output: self headDataModelView employeeName
> >         on: html.
> >
> > MLHeadDataModelView>>initialize
> > initialize
> >     super initialize.
> >    self headDataModelView: MLHeadDataModel new.
> >
> > I don't get any error messages if I use the on:of: style, but not
> > sure what exact difference or benefits are between the two.
>
> The difference is that you don't have a #setFocus message.
>
> > MLHeadDataModelView>>renderCompanyTextInputOn:
> > renderCompanyTextInputOn: html
> > self
> >         renderLabel: 'Company Name: '
> >         input: [
> >             html textInput on: #companyName of: self
> > headDataModelView]
> >         output: self headDataModelView companyName
> >         on: html.
> >
> > MLHeadDataModelView>>renderEmployeeTextInputOn:
> > renderEmployeeTextInputOn: html
> > self
> >         renderLabel: 'Employee Name: '
> >         input: [
> >             html textInput on: #employeeName of: self
> > headDataModelView]
> >         output: self headDataModelView employeeName
> >         on: html.
> >
> > Thanks in advance for any feedback.
> >
> > Regards
> > Adrian
>
> Hope that helps, and welcome to Seaside!
>
> James Foster
>
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