derguteonkeldod wrote: > Thank you very much for this explanation, Peter! > > A link that explains in detail with examples the servlet-JavaScript > interaction is further more very apprechiated. > > > --- In svg-developers@yahoogroups.com, Peter Thompson > <[EMAIL PROTECTED]> wrote: >> There are lots of people here who can explain this. >> >> Generally, SVG and JavaScript are both running in a browser on a > client. SVG communicates with JavaScript via events. JavaScript > updates the DOM, which is the in-memory representation of the SVG. > See this link for a working example of JavaScript/SVG interaction: >> http://www.w3.org/TR/SVG11/script.html#EventHandling >> >> The Java Servlets run on a web server that supports servlets (e.g., > Tomcat). The client JavaScript that is embedded in the SVG can > communicate with a servlet via getURL() and postURL() calls. For > example, the client can call getURL(url, callback) to execute the > doGet() function in a servlet. In Tomcat, the url is mapped to the > servlet via the web.xml file. The doGet() function on the server > returns a result to the client, which causes the callback function on > the client to be called. The callback function parses the results and > updates the DOM, causing the display to be updated. >> >> getURL() and postURL() are supported by the Adobe SVG and Batik > viewers, but not all viewers. >> >> I don't know of a link that explains in detail with examples the > servlet-JavaScript interaction (maybe someone else can provide this). > If you know how to do servlets on your web server, then getting them > to work with client JavaScript and SVG isn't difficult.
I learn how to do servlet this week, so such topic suddenly has some interest for me... I think Peter gave an excellent explaination on how to proceed. I googled for [svg geturl posturl] and found this page: http://jibbering.com/2002/5/dynamic-update-svg.html which is a very clear explaination on how to use getURL. The core of the mechanism is getURL. For a servlet, I suppose you can use something like: getURL('/SVGWebApp/servlet/SVGDataGenerator?clickedButton=' + buttNb, callBackFunction) The servlet handles the parameters (Jim uses no parameter at all, which is fine for just outputting data evolving with time) in the doGet, and spits out a file containing either plain text data or XML (perhaps SVG fragments), which can be parsed in the callBackFunction using the obj.content (and perhaps the obj.contentType if needed). Sorry, I am only paraphrasing Peter and Jim, but I though that formulating it (slightly) differently could help understanding. Right now, my schedule doesn't allow me to experiment with this, although I find this exciting, so I will think of a possible application (one could show, eg., a graph showing off the CPU/memory load of the server, if he/she know how to get this info in Java) and experiment as soon as possible. Of course, if I ever find time for this, I will make the results public, here and/or on my site. -- Philippe Lhoste -- (near) Paris -- France -- http://Phi.Lho.free.fr -- For servers mangling my From and Reply-To fields, -- please send private answers to PhiLho(a)GMX.net -- -- -- -- -- -- -- -- -- -- -- -- -- -- ----- To unsubscribe send a message to: [EMAIL PROTECTED] -or- visit http://groups.yahoo.com/group/svg-developers and click "edit my membership" ---- Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/svg-developers/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
