I started my investigation by using Enterprise.aspx sample of WebGrid. The live version of this sample can be accessed in here or here (with modern theme applied).

We have Intersoft Parent-child webgrid, when we insert records in child grid and then try to expand the child grid, the child grid is not expanding and we are receiving the below error in the browser console...

Per your information, following steps are performed:

1. Insert record in child grid. Expand any row (in my end, the row with ALFKI as CustomerID is expanded) from root table of WebGrid. Then insert record by providing needed information (such as: EmployeeID; OrderDate; ...; ShipCountry) in new row bar.
2. After successfully insert the record, try to expand the newly added record.

Result: child grid is expanding and no error persist in my end.

The test were taken on Chrome 55.0 and Mozilla Firefox 50.1 browser. WebGrid 10 (10.0.7200.24) and WebUI.NET Framework 3.0 (3.0.5000.976) are used during the test.

Should you find anything that I might miss during my attempt in order to reproduce the reported problem, please feel free to let me know.

Hi Yudi,

Do we have any update on this ticket ?

Thank You

Hi Yudi,

We are waiting for your response. Please let us know if you need any additional information

Thanks 

Sorry for the late response.

Thank you for the sent video (webgrid not expanding issue.webm). From the video, there are two new row committed:

• First new row (comment test 1)
  See video 00:00 to 00:12. This new row is added under Parcel row.
• Second new row (comment in valuations)
  See video 00:14 to 00:29. This new row is added under Valuations row.

The difference between those two new rows are:

• after user click Save button, the Valuations row collapsed. This doesn't happen when adding the First new row (comment test 1).
• The Parcel row already has a single child row before addition. While there is no child row under Valuations row before addition.

I started my investigation by adding a new row in the root table. Hence, there is no child row for this new root table row.
After that, try to add new child-row under the new root table row.

The reported problem doesn't persist in my local sample.
*Note: the test was performed on Chrome 55.0 browser.

I enclosed my sample as attachment (ChildNodeNotExpanding.zip). Please have the sample evaluated on your end and let me know if you have different result.

Please note that I don't use button to save the changes on WebGrid. If needed, you can modify my sample then send the sample back to us to be investigated further.