columndefs targets code example

Example: server side datatable target all

There are four options for target :

1. 0 or a positive integer - column index counting from the left
2. A negative integer - column index counting from the right
3. A string - class name will be matched on the TH for the column(without a 
leading .)
4. The string "_all" - all columns (i.e. assign a default)