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From Sylvain Vieujot <svieu...@apache.org>
Subject Re: New s:graphicImageAjax component.
Date Wed, 28 Sep 2005 17:03:54 GMT
As for the URL limitation, this can indeed be a problem, but not @ 1024
chars.
There is no spec limiting the number of chars in the URL, but browsers
can have problems :
http://www.aspfaq.com/show.asp?id=2222

But, as I didn't find any way to use a post request to load an image, I
see no workaround for this.
We'll just have to experiment if in real life it causes really problems,
and put a warning on this.

About your phase listener comment, could you send me a patch for this ?

Thanks !

Sylvain.

On Wed, 2005-09-28 at 10:06 +0200, Mathias Brökelmann wrote:

> Great! We definitely need a component to render dynamic images.
> 
> I took a view into the code and saw that the state is appended to the
> image url. IMO it will not work in every case since the state could be
> very large and as far as I know there is a limitation around 1024
> chars in a request url.
> 
> The other thing is the phase listener which will not work if the
> component is used in a uidata component. Try using a custom faces
> event which is queued through UIComponent.queueEvent(...).
> 
> 
> 2005/9/28, Sylvain Vieujot <svieujot@apache.org>:
> >  I just committed a first working version of a graphicImage component that
> > displays the images from bytes, and that doesn't need an additional servlet.
> >
> >  It works, but there is still work to be done (See the TODOs in the
> > component's java file).
> >
> >  The most important things are :
> >  1) Find a good name for this component. Right now, it says Ajax whereas
> > it's not really Ajax.
> >  2) Extend it to make download links (uses an <a> instead of an <img>
> >
> >  Thanks for your ideas,
> >
> >  Sylvain.
> >
> >  On Tue, 2005-09-27 at 12:35 -0400, Mike Kienenberger wrote:
> >  Sylvain,
> >
> > I'm definitely interested in a component that can display an image
> > from bytes as well, if you want any assistance.
> >
> > "-- need a dynamic image servlet" is the next item on my todo list :)
> >
> > On 9/26/05, Sylvain Vieujot <svieujot@apache.org> wrote:
> > > Yes, you're right, but I was looking for a way to use the same code with a
> > > get request instead of a post request.
> > > So, I think this will work.
> > >
> > > I'll post this soon so that you can check it.
> > >
> > > Thanks,
> > >
> > > Sylvain.
> > >
> > >
> > > On Mon, 2005-09-26 at 23:24 +0200, Martin Marinschek wrote:
> > > The snippet you posted is just about remembering the state of the
> > > application client side - it doesn't have to do anything with dynamic
> > > loading of images...
> > >
> > > Or do I get you completely wrong?
> > >
> > > regards,
> > >
> > > Martin
> > >
> > > On 9/26/05, Sylvain Vieujot <svieujot@apache.org> wrote:
> > > > You're right, Ajax isn't the perfect term for this, as the result won't
> > be
> > > > XML.
> > > >
> > > > But maybe it can work using something similar to that :
> > > > " callback: function(element,entry) {return
> > > >
> > >
> > entry+'&jsf_tree_64='+encodeURIComponent(document.getElementById('jsf_tree_64').value)+'&jsf_state_64='+encodeURIComponent(document.getElementById('jsf_state_64').value)+'&jsf_viewid='+encodeURIComponent(document.getElementById('jsf_viewid').value)}"
> > > > +
> > > >
> > > > (extracted from the inputSuggestAjax code).
> > > >
> > > > Thanks for the clue.
> > > >
> > > > Sylvain.
> > > >
> > > >
> > > > On Mon, 2005-09-26 at 16:27 -0400, Matt Blum wrote:
> > > >
> > > > The XMLHttpRequest object (or the equivalent ActiveX control)'s open
> > > method
> > > > takes as its first argument the request method you want to use. So you
> > > > could make a get request simply by saying:
> > > >
> > > > xHR.open("GET", url[, asyncflag][, username][, password]);
> > > >
> > > > I believe that answers your question, but I'm not sure I understand how
> > > > that helps you. I mean, AJAX will return a text string, and possibly a
> > > > document object if the response is valid XML. It won't return an image.
> > > > The only way to load an image is, as you say, using the src property of
> > > the
> > > > image object, and that will always do a GET. I don't see how you get
> > AJAX
> > > > to work into this scenario, unless you plan to use it to generate the
> > URL
> > > > for the image object to load.
> > > >
> > > > Or am I just missing something in your original message?
> > > >
> > > > -Matt
> > > >
> > > >
> > > > On 9/26/05, Sylvain Vieujot <svieujot@apache.org> wrote:
> > > >
> > > > Hello,
> > > >
> > > > I'm trying to make a new component that would display an image, but
> > > without
> > > > the need to have a dedicated servlet.
> > > > It would make applications that use images from a lot of different
> > sources
> > > > (i.e. servlets) much simpler.
> > > > Basically, it would be a component like :
> > > > <x:graphicImageAjax getBytesMethod="#{myBean.imageBytes}"/>
> > > >
> > > > As the only way I found to load an image in javascript is
> > image.src="...",
> > > > I can't use a post request.
> > > >
> > > > Does someone know a way either to load an image in javascript with the
> > > > result of a post request, or a way to use ajax like in inputSuggestAjax,
> > > but
> > > > with a get url ?
> > > >
> > > > Thanks,
> > > >
> > > > Sylvain.
> > > >
> > > >
> > >
> > >
> > > --
> > >
> > > http://www.irian.at
> > > Your JSF powerhouse -
> > > JSF Trainings in English and German
> > >
> > >
> >
> >
> 
> 
> --
> Mathias

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