how to make block do a procedure when an entity collides with it without letting them walk through it? [SOLVED]

hi, i'm working on a few new blocks for my parkour block mod and i'm trying to make a block that functions the same way honey blocks do when you slide down them, but without everything else that comes with honey blocks. i've tried using the "when entity collides in block" trigger but that only works if i get rid of the block's collision and i want it to stay solid like the honey block. i don't know java so i'm kinda limited to procedures at this point

all help is appreciated!