Detect if player is looking up

[Bestmasters]

I am VERY new to modding, and want to make it so that when the player looks up, it teleports all entities in a 1 block radius to the top of the player. I can't seem to get if the player is looking up or not. Please help

[Luis_ST]

You can get the Player head x rotation via #getXRot. If the value equals -90.0F the player is looking up.