On setting the width through valuePrepareFunction() i am not able to use text-overflow ellipsis property

On setting the width through valuePrepareFunction() i am not able to use text-overflow ellipsis property. I am rendering column at runtime and trying to use ellipsis property of text-overflow as my item description column is way too big. when i am doing through your normal width property i am not getting the expected result so i prepared the value by using your function and i resolved the width problem but then again one more issue occurred that is the value is not overlapping the other values.

I hope i am able to convey my issue. Please help me out!!!..

If any doubt then please reply me