Ball Dislodged by Defense on Lay-Up Attempt

Q: On a lay-up attempt, while the ball is still in shooter's hand, the defence slaps the ball off the shooter's hand, shooter grabs the ball then returns to the floor. Is it a travelling violation? 

A: If the ball leaves the shooters’ hands completely after the defender touches the ball, the shooter may grab the ball and return to the floor with no penalty. They then have the options to shoot, pass or dribble.