onUndo

fires when undo/redo operations are performed

void onUndo(string action,number row,number column,object value,boolean dir,object extra);

action	string	the name of the action that is undone or redone
row	number	row number, range start
column	number	column number, range end
value	object	value that is changed
dir	boolean	false - undo, true - redo
extra	object	any additional info

Example

webix.ui({
  view:"spreadsheet",
  toolbar:"full",
  data:spreadsheet_data,
  on:{
    onUndo(action, row, column, value, dir, extra){
      if(action == "paste"){
        //do smth
      } else if(action == "grid-change"){ //add or remove row/col
        //do smth
      }
    },
  }
});