[Zope] Displaying Graphs using TAL

Andreas Jung lists at zopyx.com
Fri May 30 03:30:32 EDT 2008

--On 30. Mai 2008 12:38:21 +0530 Andyy <ggirotra at gmail.com> wrote:

> i am preparing graphs(MatPlotLib) related files using external methods.,
> when i test them on zope they display very well there.
> But when i call these external methods using tal as:
> <Img tal:attributes="src python: context.IterationBar(context) "/>
> where IterationBar is my external method that displays a BarChart.
> Or using
>  <img src="/Agile/image.gif"
>    tal:attributes="src context.IteartionBar(context)"/>

1) the thing you're calling must return an *URL*
   not the image data itself...think about how the <img>
   in HTML works

2) The script called through the given url must return the image
   data _and_ it must set the proper http headers content-type,
   and content-length

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