can you please send a code snippet example.
On Thu, Oct 14, 2010 at 2:29 PM, Ümit <[email protected]> wrote:
> I have a weird problem with the Google Visualization API and GWT.
> I am using a MVP Package (gwtp) to create an application. Basically I
> have two presenters and views respectively.
>
> One view/presenter displays as static text and the other one displays
> as PieChart (google-vis-api).
> As soon as the presenter with the Piechart is revealed a DataTable
> with some test data is created and passed to the draw method of the
> Piechart.
> This works without any problems. The piechart is displayed just fine.
> However as soon as I navigate away from the pie chart presenter to the
> static text presenter and then back to the Piechart presenter
> (thus creating again a DataTable and calling the draw method) I get an
> visualization error ("a is null").
>
> if I do a hard refresh (F5) the Piechart works again.
> The same applies if I recreate the Piechart instance as soon as I
> display the Piechart page.
>
>
> I suspect that there is a problem when detaching and re-attaching the
> DOM-container of the visualization widget so that calling draw on the
> datatable I somewhere get the error "a is null".
>
> I have attached a sample GWT application (which should contain all
> necessary libs) which let's you reproduce the problem.
>
> I have tried to debug it but because the visualization code is
> obfuscated i didn't get far. As far as I could there seems to be a
> problem somewhere in the setSelection function.
>
> Maybe someone has an idea what might be the problem
>
> Cheers
>
> Thanks in advance
>
> Uemit
>
> P.S.: http://rapidshare.com/files/423663096/gwtpvisualizationsample.zip
>
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