Nick, I like this idea. Do you know of any examples that make use of this concept? What code would I use (generically) to have the invisible frame force a resubmit on the viewable frame?
Have you ever worked with pushlets? Are they worth messing with? thanks, -jeff --- Nick Sophinos <[EMAIL PROTECTED]> wrote: > Adding to Justin's method, you can make this polling > a more subtle event > by placing a polling jsp page in a frameset with > your jsp page, but have > the polling page take up no visible space. > > So in effect you divide it into 2 pages: the > original data diplay page and > an invisible "polling" page that only check to see > it the datasource has > changed (by getting a rowcount, for example). > > The polling jsp will poll the data source a a given > time interval > and if the data has changed, the polling page can > use javascript > to force the data display page to resubmit to ge the > new data. > > This way you have 2 advantages: > > 1) The polling page just check to see if the data > has changed and > does not bring back the entire data set every time > > 2) the data display page only resubmits back to the > datasource > only when the datasource has changed. > > - Nick > > > > > > > On Tue, 14 Jan 2003, Justin Ruthenbeck wrote: > > > > > Hi Jeff -- > > > > Once your jsp outputs its data, its job is done > and > > there is no opportunity for it to update anything. > > The only way data can be updated is if the client > > requests it, which means you'll have to force the > > client to refresh. If it's a browser, set the > > appropriate header or include the correct HTML > > tag (I don't know the currently "best" way to do > this, > > but you specify how often you want to refresh and > the > > URL to get -- google for "HTTP-EQUIV=Refresh"). > > This is only an approximation of what you're > trying to > > do ... if you want live communication between > server > > and client, you'll need something on the client to > > listen to the socket (and applet would work) and > act > > accordingly. > > > > Hope that's enough to get you going... let me know > if > > you need more specifics. > > > > justin > > > > > > At 11:08 AM 1/14/2003, you wrote: > > >Hello! > > > > > >Forgive this very newbie-ish question. If someone > > >could point me in the right direction I would > > >appreciate it. > > > > > >Is it possible/feasible to have .jsp page refresh > the > > >data it's displaying when the data on the backend > > >changes? For example if I have a .jsp page that > > >queries and displays data from a database, can > the > > >page be coded to monitor the data and when it > changes, > > >refresh what is displayed in the user's browser? > > > > > >I hope the question makes sense. > > > > > >thanks! > > >-jeff > > > > > > >__________________________________________________ > > >Do you Yahoo!? > > >Yahoo! Mail Plus - Powerful. Affordable. Sign up > now. > > >http://mailplus.yahoo.com > > > > > >-- > > >To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > > >For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > > > > > > ____________________________________ > > Justin Ruthenbeck > > Software Engineer, NextEngine Inc. > > [EMAIL PROTECTED] > > Confidential - > > See > http://www.nextengine.com/confidentiality.php > > ____________________________________ > > > > > > -- > > To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > > For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > > > > > > > -- > To unsubscribe, e-mail: > <mailto:[EMAIL PROTECTED]> > For additional commands, e-mail: > <mailto:[EMAIL PROTECTED]> > __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
