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List:       tapestry-user
Subject:    Re: Ajax related trouble
From:       "=?UTF-8?Q?Alp_=C3=87evik?=" <atcevik () gmail ! com>
Date:       2008-01-20 10:37:55
Message-ID: afdf82540801200237k1bc26856xe96f530a67283377 () mail ! gmail ! com
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Hi Andreas,

I am using 4.1.3.

The problem I am experiencing with the responsebuilder methods is I cannot
retrieve the MarkupWriter, getWriter within the responsebuilder returns
null. Thought it was something related to the lifecycle of tapestry
rendering and stuff. I didnt get into internals so I gave up trying to get a
handle. I dont know if initialization of a new MArkupwriter should do the
trick, if it does, then there is this problem of acquiring the printwriter,
where do I get it? a new instance is ok there too? (Maybe I should work on
the internals more before asking these questions, these may sound real
silly, but i do hope that I dont need to get all the details of the tapestry
engine in order to trigger some client side function.)

I guess I will be working on 4.1.4 as you suggested, as I also do want the
features of dojo 1.0.

About the documentation, it would be great to include some details about
calling a client side script, which is tough to find out, as I have been
looking into the matter for several hours now but was unable to get the
results yet. I also own the tapestry in action book but still it is tough to
find answers.

Thank you,
Alp



On Jan 20, 2008 3:26 AM, Andreas Andreou <andreoua@gmail.com> wrote:

> Which Tapestry version is this with?
>
> I think there was a change in 4.1.4-SNAPSHOT that handles the
> nullpointer exception
> when using addinitializationscript.
>
> On the other hand, let me propose another solution that (I think)
> better works in your case
>
> ResponseBuilder.addStatusMessage(IMarkupWriter writer, String
> category, String text)
> - you can get the responseBuilder from the currect IRequestCycle -.
>
> When the ajax response arrives, tapestry will 'publish' the text using
> the given category, i.e.
> it will execute for you: dojo.event.topic.publish('myCategoy','myText')
>
> So, if you're subscribed to that topic, your custom js functions can
> be notified, i.e.
> dojo.event.topic.subscribe('myCategory', function(msg) { alert(msg);
> /* do custom processing here */ } );
>
> I'll raise a documentation issue for this - i think i missed explaining
> it.
>
>
>
>
> On Jan 20, 2008 1:10 AM, Alp Çevik <atcevik@gmail.com> wrote:
> > Hello all,
> >
> > I am a newbie trying to develop some app using Tapestry. I currently am
> > having some trouble using the ajax functionality.
> >
> > The thing is, I am trying to use some 3rd party flash charting component
> > (Fusion charts v2) which I would like to update when data changes. The
> data
> > is also changed by the application which contains the charts.
> > 1- I have to make some javascript function calls to update the chart
> > 2- the chart should be updated after new data is sent to the server and
> > processed
> >
> > I am using Directlink and update components to process the changed data
> on
> > the server, which works smoothly. The trouble is, I need to find some
> way to
> > trigger the function to update the charts after the directlink listener
> does
> > its job.
> >
> > - thought of implementing a servlet for using ajax calls within
> tapestry,
> > but as the objects tend to change, it costs a lot to overcome the
> > synchronization issue with tapestry & the servlet
> > - I have tried updateing components for the part that runs the
> javascript,
> > receiving the javascript function call as new content with ajax, which
> > resulted in nonworking code in IE.
> > - tried using contrib Xtile component, noticing that I have to be
> calling
> > the listener with this component also and handle all the ajax related
> stuff
> > which current direct link is doing
> > - tried using event handler annotations, which did not work as the
> > javascript method that starts the process on eventhandler has no
> relations
> > to the directlink listener.
> > - tried getting the responsebuilder and outputting the script as an
> > initialization script, using write..script, during which I tried to
> obtain
> > some reference to the MarkupWriter hopelessly, then tried
> > addinitializationscript and got a nullpointer exception that I could not
> > figure out, though I could get the component and stuff on debugger.
> >
> > Thank you in advance,
> >
> > Alp
> >
>
>
>
> --
> Andreas Andreou - andyhot@apache.org - http://blog.andyhot.gr
> Tapestry / Tacos developer
> Open Source / JEE Consulting
>
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