[Seaside] Generated links (anchor -> callback)

[James Foster]

Hi Mark,

As Dale mentioned, GemStone doesn't quite handle the block the way you  
expect. The workaround is to help the compiler see that this is really  
a new context. I generally do this with a new method:

renderContentOn: canvas

	1 to: 10 do: [:index | self renderIndex: index on: canvas].
%
renderIndex: anInteger on: aCanvas

	aCanvas anchor
		callback: [self value: anInteger];
		with: anInteger.
	aCanvas space.
%

Because the refactoring tends to give smaller, better named methods, I  
generally don't find this GemStone "bug" to be much of a burden.

James

On Jul 5, 2009, at 4:14 PM, Mark Ross wrote:

> Hi seaside list!
>
> I'm roughly new in developing seaside. Trying out some seaside  
> development.
>
> I'm using:
> GemStone/S 64 Bit
> 2.3.1 Build: gss64_2_3_x_branch-20643
> Thu Dec  4 11:33:32 2008
>
> with GemTools 2.3.1
>
> I would like create links on my page - with generated URLS, which  
> have the
> value of the index from render time.
>
> I try by using something like this:
>
> initialize
>        super initialize.
>        self value: 0
>
> renderContentOn: canvas
>
> canvas text: self value.
>
>   1 to: 10 do: [ :index |
>       canvas anchor
>          callback:[ self value: index  ];
>                 with: index.
>       html space ].
>
> -> The value is everytime clicking on a link '10' - which I would
> understand, if i didn't read the tutorial on the seaside.st site:
>
> -----snip -----
> renderContentOn: html
>   1 to: 10 do: [ :index |
>       html anchor
>          callback: [ index inspect ];
>          with: index.
>       html space ]
>
> It will generate a series of links, labelled from 1 to 10. Because the
> action blocks capture the current value of the i variable, each one  
> will
> have a distinct callback: clicking on the "1" link will evaluate 1
> inspect, on the "2" link will evaluate 2 inspect, and so on. The block
> closure is being used to maintain all of the interesting state for the
> link.
> -----snap-----
>
> Please, can somebody help me out finding my mistake?
>
> Best regards
>
> Mark
>
>
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