Also, I don't think storing anything in the session is the solution because then you have to manage a lot of other problems (when to delete them from the session, how are you sure they'll be deleted, won't it generate too high trafic in a clustered environment, ...).
On the other hand, adding to the extensions filter a hook mechanism for individual components would be nice.
Just have to find out how to do this in a clean and general purpose way.
I like Mike's idea to serialize just a minimal tree, as it would work in every situation. We just have to see how to do it.
Thanks,
Sylvain.
On Thu, 2005-09-29 at 10:03 +0200, Mathias Brökelmann wrote:
We have created a similar component for our application which depends on a servlet. We use an interface for the value which must be implemented to return the binary data and the content type. The value is stored into the session by using an unique key. That key is used in a param for the url. When the request for the binary data is processed the instance is fetched from the session which creates the binary response. We could utilise the existing extension filter to support this. So we wouldn´t need an additional servlet or filter. Even if we would make it work by using a post it wouldn´t be a good solution if someone has a lot of images. If the state has a considerable size it would be posted for every image and slows down the rendering of the page in the browser. The patch for the action event isn´t the problem. But we should discuss whats the best solution before changing everything. 2005/9/28, Sylvain Vieujot <[EMAIL PROTECTED]>: > 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 <[EMAIL PROTECTED]>: > > 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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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 <[EMAIL PROTECTED]> 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 > > -- Mathias
