executes some custom method for all cells in the currently selected block
callback | function | the callback function |
//uppercase selected cells
dtable.mapSelection(function(value){
return value.toString().toUpperCase();
});
-value string|int the cell value
-row_id string|int the row id
-column_id string|int the column id
-row_ind number the row index of a cell within the selected block
-col_ind number the column index of a cell within the selected block
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