[Solved] Implementing standard deviation aggregate for the whole grid as well as for groups

[Eugene]

I would like to implement a standard deviation aggregate for the entire grid as well as for individual groups.  I found this article which describes a workaround for introducing custom aggregates http://www.telerik.com/forums/how-to-do-custom-aggregate-functions.

Is following that example my best bet.  In my case I actually need to get access to the constituents of each group in order to recalculate the standard deviation.

Is there a better method for accomplishing what I need?  Has custom aggregates feature been requested and is it something you are considering implementing?

Thanks a lot.

--e 

[Petur Subev]

Hello Eugene,

 

As my colleague Alex mentioned custom aggregates are not supported and any progress on implementing such feature should be noted on our official feedback portal:

http://kendoui-feedback.telerik.com/forums/127393-telerik-kendo-ui-feedback

In the work-around which invokes a function inside the template i.e. #= someFunction(foo, bar) # you can only pass aggregates defined for the entire Grid, you cannot access the collection of the aggregates in the different groups. Also notice that only aggregates for the visible groups are calculated, not for the whole Grid on all the pages.

 

Kind Regards,
Petur Subev
Telerik

 

 

[Eugene]

But if I use DataSource.view and calculate my own aggregates from scratch can I get all groups or will view only have visible groups?

--e

[Petur Subev]

Hello Eugene,

The view() method of the dataSource will always return the items / (or gruops if the Grid is grouped) for the current page, you wont have the collection of grouped items for the other pages.

Kind Regards,
Petur Subev
Telerik