How to export full column total using footerCallback function ?

jeethu

''' Hi All,

''' I have used footerCallback function to calculate total sum of column values. '''

''' In each table page its showing correclty, but while exporting table full table data it is only showing current page total value. Exported data showing all rows in the table , but column total is current page total. '''

''' How can I show current page column total in footer and export all column total in pdf?'''