DEL key invoking the UPDATE operation rather than the DELETE operation. Any way I could override this behaviour?

[KarthikRaju391]

When deleting a row with the DEL key, the values of each column of the row is getting undefined/null but the row isn't getting deleted.
Then I saw that the DEL key was invoking the UPDATE operation rather than DELETE operation. If it was designed to do so, how can I override it?

Another thing is that I haven't setup a deleteValue function for the column. Is that interfering with the default behaviour of the DEL key behaviour?