dynamic chart creation (CP 2.2)

dimitri pater wrote:
> Hi,
> maybe someone here cab give me a clue on how to
accomplish the following:
> on http://www.serpia.org/wat
er I am running a test with ChartDirector,
> this page includes a form that trggers the action
"../makeGraph"
> makeGraph is something like this:
>
>         def makeGraph(self, howmuch):
>             # create a random string and concenate it
to png
>             ...
>             # The data for the bar chart
>            
c.makeChart("../charts/"+a+"")
>            
>             result = []
>             result.append('<h1>Reporting the
results!</h1>')
>             result.append('<img
src="../charts/%s">' % a)
>             return 'n'.join(result)
>         makeGraph.exposed = True
>
> So that the chart gets a random name and is diplayed on
the webpage.
> But, what I really want to do is displaying the chart
on the ../water
> page (where the form also is)
> I have tried doing a redirect from ../makeGraph to
/water in stead of
> returning the result, but that only works if the
filename is always
> the same (using <img=" chart.png">. But
I need a random name every
> time a Chart is created.
> Any idea? Your help is appreciated!

There are several ways.  One way is to have an
<iframe> to hold your
chart, have some Javascript that refreshes it when the user
hits <submit>.

Another way is to use something like AJAX to fetch the file
name, and
modify the <img> tag on the fly to insert the new
filename.

-- 
Tim Roberts, timrprobo.com
Providenza & Boekelheide, Inc.


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