Question

Updating UpdatePanel only after another UpdatePanel has finished updating

Asked by: DerekWatling

I have a ASP.NET 2.0 AJAX page with a number of UpdatePanels. One of these contains an image generated by Manifold GIS Internet Map Server. This "image" is actually through a call to a seperate page that returns binary blob data and is written directly with Response.BinaryWrite. In the process it returns an ID value which I am currently storing in a Session variable.

There is a second update panel for information which uses this ID to query a MySQL database. My problem is that I can't get hold of the Session variable until the image has finished loading and then need to update the information panel.

How can I ensure that I have this ID before updating the second panel? Currently the information displayed is always one update behind the image!

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Asked On
2007-09-18 at 08:10:32ID22836205
Tags

updatepanel

,

updating

Topics

Programming for ASP.NET

,

JavaScript

,

GIS & GPS Programming

Participating Experts
4
Points
500
Comments
8

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Answers

 

by: ZvonkoPosted on 2007-09-18 at 08:26:42ID: 19913731

Call the dependant AJAX call from the callBack handler of the AJAX call that returns the ID.

 

by: DerekWatlingPosted on 2007-09-18 at 09:57:31ID: 19914622

What is the callBack handler? Is this done in JavaScript or VB?

 

by: DerekWatlingPosted on 2007-09-19 at 02:11:10ID: 19919105

I have now spent a few hours trying to find out how/where to set a callBack handler and am just getting more confused. While I think I understand the theroy of what a callBack handler is, I have no idea where it should go in the code or even how to define one.

 

by: viliaPosted on 2007-09-19 at 06:57:36ID: 19920630

ajax concept:
http://www.yourhtmlsource.com/javascript/ajax.html
(search the page for: callback function, in particular)

 

by: DerekWatlingPosted on 2007-10-01 at 03:13:12ID: 19989684

vilia, while this is a good article, it is not specific enough to .NET.

 

by: darrelloPosted on 2007-10-17 at 05:10:14ID: 20092457

Have you looked at using WebParts and having them act as a Publisher/Consumer - the first UpdatePanel could announce that it is done updating, triggering the update of the other?  You would need to put in <iframe> elements in the panel objects though.

 

by: DerekWatlingPosted on 2007-10-19 at 00:49:58ID: 20107186

Thanks for the suggestion. I have managed to find a solution to this problem, but will look into WebParts.

 

by: ajollyPosted on 2008-04-05 at 07:10:29ID: 21288208

Hey hey hey ..
If you are using ASP.Net 2.0 ... why do you want to mess with the XMLHTTP.

There is another way to do this, that I have been using for a long.
Its pretty good.

see,  There is something PageRequestManager, and everytime the updatepanel is updated, you come to know by it.
Here you can register a javascript which will update the dependent update panel after the first one is done with it.

var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_pageLoaded(pageLoaded);

and you can write any code in PageLoaded method.

for more help .. pls go and read at the following URL:
http://msdn2.microsoft.com/en-us/magazine/cc163413.aspx

20120131-EE-VQP-002

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