To make a player with platform behaviour bounce/jump, set it's vector Y to a negative number
Player on collision with Spring -> Player set vector Y to -256
You'd set the Spring to play it's animation in the same event
Here's a C2 capx that you should be able to import into C3:
https://www.dropbox.com/s/56exf6azd9ryl ... .capx?dl=1
It shows the event (without animation), but with the added bonus of increasing the height of the bounce/jump (using an instance variable) each time you land on the spring without hitting the ground.