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Update information in a JSP page

Posted on 2002-05-16
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Last Modified: 2010-05-18
I want periodically update the information in a table on a jsp page by calling an method. Is there a timer in JSP to help this?
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Question by:pzhang
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5 Comments
 
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Expert Comment

by:raid999
ID: 7015296
Mate there is a class called Timer have alook at this
http://java.sun.com/j2se/1.3/docs/api/java/util/Timer.html
and this is really good too.
http://www.javaworld.com/javaworld/javatips/jw-javatip125.html
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cheekycj earned 100 total points
ID: 7018836
for JSP to update a table automatically you have two options (I believe)

use a javascript timer and dynamcially update the table using DHTML.

or use meta refresh header tag.

CJ
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Assisted Solution

by:mark_at_serialmonkey
mark_at_serialmonkey earned 100 total points
ID: 7038336
There are a couple of options.

1. Use a Javascript timer and refresh the whole page.
2. Use a META-Refresh tag
3. Use a Javascript timer and a hidden frame and update using DHTML.

The first two are good for largish refresh times (20sec, 30sec for example) and if all the data is on the screen at once (i.e. you have no scroll bar).

The last one is a must for small refresh times and scrolling because the first two options reload the whole page and such scroll the user back to the top of the page. Very annoying if the user is scrolled half way down and it keeps refreshing and sending them to the top.

The third one is using a hidden frame to constantly refresh using a Javascript timer. Each time it refreshes it checks to see if the page is loaded and then updates the table using DHTML. You have to be careful with DHTML as most of the solutions only work in Internet Explorer and there are retrictions on how tables work with DHTML.

A good site on how to use DHTML in IE is
http://msdn.microsoft.com/workshop/author/dyncontent/content.asp?frame=true
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by:Kuldeepchaturvedi
ID: 9553795
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