DataFiltering Property

// The client event DataFiltering takes two parameters sender and e
// sender  is the object which is raising the event
// e is the CancelApplyFiltersEventArgs
function WDG1_DataFiltering(sender, e) {

    //Gets the column filters array which will be used to filter the data in the grid
    var columnFilters = e.get_columnFilters();

    //Gets the column key
    var key = columnFilters[0].get_columnKey();

    if (!confirm("Are you sure you want to continue with filtering the column '" + key + "'?"))

        //Cancels the 'DataFiltering' event
        e.set_cancel(true);
        
  }