How to get editing cell's original value in grid

[Alan]

Try to determine target cell editable or not based on its value

try to do it at edit event but do not know how to get target cell's original value

please help

code:


edit: function(e) {
var val = ;   // target cell's value
if (val = "-"){
         this.closeCell();
}
}


how to get val's value?