Hi Handy,

Thanks for your helpful answer. First I searched for this property, but both Google and your site returned zero results. Then I assumed there was a typo. I also thought that WebGrid 6 doesn't support this feature. But I remember that we upgraded to WebGrid 6 not so long ago, so maybe this was valid only for WebGrid 5. Anyway, I found the property in the meantime. It is called RestoreExpandedChildRows and is located on the LayoutSettings tag.

I have set this to true and removed all other previous code to expand / collaps by JavaScript. Unfortunately  it is still not working. Are you sure this should work with WebGrid version 6?

Can you modify my last sample so that it works? With this property or by any other means.

And yes, this is the main problem remaining.

Thanks,

Eric

Any update?

Ok, I can store the merge-status now. The problem was that I tried to store it in the ViewState and during FlyPostBack the ViewState changes will not get saved onto the page.

Fixes to do this:

• Entirely remove the server-side ButtonClick handler
• In JavaScript ButtonClickHandler find out the ID (attached as CustomAttributes to another column), then read if the shown image is a plus or minus GIF, then call webGrid.AddInput to give data back to the server side, then call grid.SendCustomRequest
• In the FlyPostBack handler (InitializePostBack method) I read the given parameter and attach it to a hidden form field. Then I call grid.ClientAction.RenderControl so that it gets updated on the client side. To refresh the data below, I just call grid.ClientAction.Refresh
• In InitializeRow I look at the hidden form field to determine if we should show the plus or the minus graphic.
• In InitializeSelfReferenceDataSource I look at the hidden form field to determine if I should call the DB with the Merge-Flag with true or with false.

Now this all works. Remaining problems are:

1. When clicking on Merge or Unmerge, the hierarchical tree collapses. I tried to save all expand/collapse status in the Session, like I've done this on other places already, but it's not working. Current demo source is included with this post.
2. Expand/collapse status should not go into Session at all, because users might have several browsers open with the same application in it. But first goal is to get this working at all.
3. Refresh after merge should not refresh the whole grid, but only the part that changes.
4. Verify that this design is correct.
   

Most important is now getting the expand/collapse to work (remain as it is when clicking merge/unmerge).

Regards,

Eric

Hi Handy,

It took me several days to create this example. I hope it was worth the effort. The problem I had was that WebGrid showed unexpected behaviour when running this form standalone (out of our project). After long investigations I found out that in my sample I didn't use a Session object. Without touching the session, WebGrid doesn't work - probably another bug. You can see that in my sample if you comment out the line Session("abc")="def" in Page_Load. But anyway, now you have a sample.

When you click on one of the "plus" buttons in the merge column, then the grid data below there should get merged. What data is expected you can see from the data generation function.

If you "merge" a node, it actually should show all data rows below it, but not the "folder-type" rows.

So, here's the sample. Copy the ISNET dll's into the bin folder and also:

AjaxControlToolkit.dll, AJAXExtensionsToolbox.dll, System.Web.Extensions.Design.dll, System.Web.Extensions.dll, VwWebSite.Interop.dll

I'm using Framework 3.0.5000.705 and WebGrid 6.0.7200.220. Please use the same version.

Regards,

Eric

Any updates?

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So you know the requirements now. To repeat: I have a read-only hierarchical WebGrid. I need a button per row (is implemented) and I need a binary value per row with the merge/unmerge display status. Clicking on the button should invert this status. This status doesn't need to get stored anywhere, but it must be preserved during postbacks etc. Changing this status per row also changes all shown data in the hierarchical grid below the clicked node, so the data in the grid needs to get refreshed in that case. How would you implement all this?