Compare 2 textbox

Good Day to everyone.
so yea im using datatables with editor
what i want to do is when i create new user using the editor
i want to compare the two textbox which is the password field
(your typical registration)

                {
                    "label": "Password:",
                    "name": "user.Password",
                    "type:" "password"
                }, {
                    "label": "Confirm Password:",
                    "name": "repassword",
                    "type:" "password"
                }

so the confirm password is only an extra textbox just to check if they match
now how can i do that in the Editor?
where if true only the 1st field will be inserted..

newbiee here.. :(