Solved

hyperlink with __doPostBack

Posted on 2008-06-16
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Last Modified: 2012-06-27
I am using a third party grid (obout) that has a limitation using a linkbutton in a grid cell to execute a postback. The linkbutton messes up whenever a sort of filter is executed on the grid. This happens when the grid is in callbackmode only. When the grid does a full postback, the linkbutton works just fine. This is a known issue that will be fixed in a future release they tell me.

The work around is to replace the linkbutton with a hyperlink containing a "__doPostBack". I'm not sure why this is a workaround. Can someone show me how to use a hyperlink to force a postback to execute a procedure in code behind which will query the database based upon the key field passed by the hyperlink?
Can't seem to find a working example of this anywhere.

Thanks,
Chi
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Question by:ChiBella
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7 Comments
 
LVL 13

Expert Comment

by:joechina
ID: 21794561
Try create a test page with only a standard linkbutton
Then open the page in browser then view source, you will something like.
<a id="LinkButton1" href="javascript:__doPostBack('LinkButton1','')">LinkButton</a>

Is this what you are looking for?
0
 

Author Comment

by:ChiBella
ID: 21796667
Maybe,

Are you saying the hyperlink with _doPostBack will look the same as a linkbutton? The grid will not work with a linkbutton for some reason.
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LVL 13

Accepted Solution

by:
joechina earned 500 total points
ID: 21798456
If you put <asp:LinkButton>, it will be rendered to html by ASP.NET runtime.
I am thinking your 3rd party control not rendering the control properly caused the issue.
So they ask you to put html instead of asp control by urself.
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Author Comment

by:ChiBella
ID: 21817668
yes that's the issue but how do I implement the href do_postback in this case?
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LVL 13

Expert Comment

by:joechina
ID: 21818411
Use
<a id="LinkButton1" href="javascript:__doPostBack('LinkButton1','')">LinkButton</a>
instead of
<asp:LinkButton>...</...>
in your asp page
0
 

Author Comment

by:ChiBella
ID: 21822888
Well, there was more to it than that. You also have to capture the event and argument in code behind.  I did find an excellent example in case anyone else needs to know how to do this:

http://forums.asp.net/p/1252181/2317659.aspx

I now have another issue related to this. I have an ajax updatepanel wrapped around the collapsible panels and the grid and this appears to be slowing everything down. I tried wrapping just the link but it fails.
0
 
LVL 13

Expert Comment

by:joechina
ID: 21827217
Updatepanel does have performance issue.
That's why lots of application is using REST style ajax call.
Can you try just wrap the whole grid instead of a part of it?
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