FooterCallback Sum Total For Multiple Columns

notabigboy

For example using footercallback, but there is only calculate the total for one column. I want to calculate the total in some columns, so the footer will display several total columns as well. I really hope can be helped, thank you.

notabigboy

Sorry if my question is confusing, because my English is not good.

I suppose the table has three columns: item, qty and price. At the footer I want to show the total for the column qty and price (each column has a total in the footer) using footercallback.

Can anyone help?