i have a calculated field Total which is a sum of amount + tax columns.
i am trying to display calculated field's value in footer in jqgrid, it is not coming properly, currently i am getting Nan in the footer. and also when either amount or tax column has a blank cell i am getting NaN. this is what i have tried, demo link http://jsfiddle.net/vwdxs9vb/2/
please help.