That would work too.
We're using an iframe for two reasons.
1). with an iframe, you don't need an addtional frameset page to deal with.
2). In our case the JSP in the IFrame is performing two duties.
a.) It queries the database for new messages
b.) It becomes the popup window that informs the user of the new messages.
Unlike a js alert window, we can actually put links and message subject
lines right in the popup window this way.
It's also easier to call window.parent.<function to make popup div> from an
iframe then comunicate between sibling frames.
I like your filter idea. If we weren't already using frames for other reasons,
I would go with a solution like that. It would be much cleaner than putting
include tags at the top of every JSP.
On Wednesday 13 August 2003 12:46 pm, Shapira, Yoav wrote:
> Howdy,
> The HTML probably looks something like this:
> <frameset cols="100%,*">
> <frame src="/realContentServlet" name="content">
> <frame src="/dbPingServlet" name="pinger">
> </frameset>
>
> The DB ping servlet checks on the database and if there's a change, its
> output includes javascript to bring up a popup window.
>
> Yoav Shapira
> Millennium ChemInformatics
>
> >-----Original Message-----
>
> From: engp0510 [mailto:[EMAIL PROTECTED]
>
> >Sent: Wednesday, August 13, 2003 12:39 PM
> >To: Tomcat Users List; [EMAIL PROTECTED]
> >Subject: Re: Question about Notify all online user
> >
> >Ben!
> >Wah! Great! Could you give me more information about your
>
> implementation?
>
> >I am not clear with iFrame.
> >
> >----- Original Message -----
>
> From: "Ben Souther" <[EMAIL PROTECTED]>
>
> >To: "Tomcat Users List" <[EMAIL PROTECTED]>
> >Sent: Thursday, August 14, 2003 12:32 AM
> >Subject: Re: Question about Notify all online user
> >
> >
> >We're doing something like this with a hidden frame (an iFrame) that
> >refreshes
> >it self every n seconds (using the Meta refresh tag). The frame just
>
> points
>
> >to a servlet which queries the database for new messages. If there is
>
> a
>
> >new
> >message, the iframe uses javascript to fire off a pop up. message.
> >
> >You're other option would be to use an applet that maintains a
>
> statefull
>
> >connection to your server. A applet list would be a better place to
>
> discuss
>
> >that approach though.
> >
> >On Wednesday 13 August 2003 12:07 pm, engp0510 wrote:
> >> Hi, all
> >> How to implement notifying all online user when the record in
>
> database
>
> >has
> >
> >> been changed? I am using Servlet and JSP to build a small
>
> Supply-Chain
>
> >> system running on Tomcat with MySQL.
> >>
> >> Thanks
> >> Zhidao
> >
> >--
> >Ben Souther
> >F.W. Davison & Company, Inc.
> >
> >
> >
> >
> >
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Ben Souther
F.W. Davison & Company, Inc.
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