datatables custom column html 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)