Thanks, this workaround does the job (and it's a cleaner solution anyway I
guess).
I still think it's a bug that Tapestry emits attributes using safePrint()
though.
Thanks,
Jacob
On Thursday 26 May 2005 14:16, Erik Hatcher wrote:
> Why even bother with using the Image component if you want to have
> custom URLs? Try this instead:
>
> <img jwcid="@Any" src="ognl:imageUrl"/>
>
> where your page or component has a getImageUrl that provides the
> desired servlet path.
>
> Erik
>
> On May 26, 2005, at 3:48 AM, Jacob Lauem�ller wrote:
> > Hi all,
> >
> > I'm currently using Tapestry to develop an application where I need
> > to display
> > dynamically created charts of statistical data. I'm generating
> > these graphs
> > using JFreeChart and my solution is to have a Tapestry page insert
> > an Image
> > component and then bind this component to a ContextAsset which
> > points to a
> > servlet that actually generates the bitmap.
> >
> > The servlet needs to receive a few parameters defining the
> > appearance of the
> > chart and I'm trying to accomplish this by building a URL to the
> > servlet such
> > as
> >
> > /chart?
> > type=WaitingTime&start=2005.05.10_00:00:00&end=2005.05.25_00:00:00&gra
> > nularity=AllDataPoints
> >
> > and then using this as the path for the ContextResourceLocation
> > passed to the
> > ContextAsset.
> >
> > The problem is that when Tapestry renders the Image component, and
> > thus
> > creates the <img src="xxx" ...> HTML tag, it ends up passing the
> > src URL to
> > AbstractMarkupWriter.attribute(String name, String value) which
> > uses the
> > safePrint() method to actually output the URL.
> >
> > safePrint() replaces all characters for which HTML entities exists,
> > transforming the URL above to
> >
> > /chart?
> > type=WaitingTime&start=2005.05.10_00:00:00&end=2005.05.25_00:0
> > 0:00&granularity=AllDataPoints
> >
> > which obviously don't work -- the Servlet container (Tomcat 5.5.9
> > in this
> > case) doesn't reverse this transformation and -- in any case -- it
> > seems
> > wrong to me to encode HTTP URLs using HTML entities.
> >
> > I have tried to work around this issue by replacing the &
> > characters in the
> > context URL with their hex equivalents, e.g. to use
> >
> > /chart?type=WaitingTime%26start=2005.05.10_00:00:00%
> > 26end=2005.05.25_00:00:00%26granularity=AllDataPoints
> >
> > in which case Tapestry no longer performs any conversions.
> > Unfortunately,
> > Tomcat then no longer extracts Servlet parameters correctly,
> > finding only one
> > parameter ('type' in the URL above).
> >
> > What gives? Is this is a bug in Tapestry -- should it really render
> > attributes
> > known to contain URLs such as src on <img> in this way? Or am I
> > missing
> > something entirely?
> >
> > TIA,
> > Jacob
> >
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