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Create a delta time column between rows
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Clint Singer
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Clint Singer asked on 16 Jul 2012, 04:47 AM
Hi,



I have started looking into using the RadDataServiceDataSource and have followed the MVVM example which actually just uses the QueryableDataServiceCollectionView and I am trying to come up with a way to create calculated columns which contain the time delta between two adjacent rows using the DateTime from one of the columns.  So basically if the DateTime between a row and its next row was 1 day, then the delta would show that. 



I am wondering if anyone has some ideas how I could do this without creating a wrapper object because that seems to cause some issues with my ability to use the DataService query directly while still being able to rely on the DataPager as I would be changing the underlying objects and collections.



The original data doesn't have deltas pre calculated because filtering changes what rows are adjacent and I would want to calculate the deltas between those the same way as if the data was contiguous.



What would be ideal is that even though I am using paging it still brings back an extra "hidden" row to be used in the delta calculation as if it was contiguous with the following page.



Cheers,

Clint

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Rossen Hristov
Telerik team
answered on 16 Jul 2012, 08:58 AM
Hi,

We are afraid that we cannot think of a possible implementation of so custom scenario with so many custom requirements with our controls. You could calculate the deltas on the server -- but you can't do that because of filtering. When there is paging, you only get the current page of data on the client -- nothing else, so the first row of a page will not have "previous" row -- it is not on the client.

I am afraid that we don't know how these requirements can be implemented with Telerik controls. Maybe your best shot would be a completely custom solution built from scratch that would be specifically designed for your specific requirements.

Regards,
Ross
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Clint Singer
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Rossen Hristov
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