How can you test in Minecraft without plugins in 1.8 whether a player jumps in the air? With scoreboards?
Maybe with the / execute command? Check out the Minecraft Wiki.
I already have the / execute command, but how can you test whether a player jumps? That doesn't work with / execute, does it? You can create a scoreboard that counts the jumps, but does it also count you jumps in the air?
You have to try that.