Javascript Code to make Players bounce when they step on sponge

boing.js

function bounceOnSponge(event){
  var player = event.player;
  var location = player.location;
  // need to convert coordinates to integers
  var x = Math.floor(location.x);
  var y = Math.floor(location.y - 1 ); // what's underfoot?
  var z = Math.floor(location.z);
  var block = location.world.getBlockAt(x, y, z);
  if (block.typeId === blocks.sponge){
    player.motionY = 2; // springs player high into air
  }
}
events.playerMove( bounceOnSponge );