Hello there! Today I will be showing you how to test to see if a player is holding a specific item. In this demonstration, to show that it works, I will apply invisibility to myself when holding white stained glass. So let's get things started. Begin by making a fill clock:




After that, set up a new dummy scoreboard objective with the name "holding": /scoreboard objectives add holding dummy Holding

Hold up. We need to know in which order in a fill clock do commands get activated. Press F3 to get all of your client statistics. In the top left, look for the area that is labeled "Facing". Make sure that you're facing north (or negative Z, whichever you prefer). Commands will then activate from bottom to top, and left to right. That in mind, let us continue.



Let's set the value of "holding" to a player to 1 when they're holding a white stained glass. To do this, use this command:
/scoreboard players set @a holding 1 {SelectedItem:{id:"minecraft:stained_glass",Damage:0s}}




Now, whenever a person is holding a white stained glass, their "holding" score will be set to 1.


Next, let's apply a perpetual invisibility effect to a player will a "holding" score of 1 with the command: /effect @a[score_holding_min=1] invisibility 2 0


Now, whenever a player is holding a white stained glass, they get invisiblity. But we have a problem! Whenever a player isn't holding the glass anymore, they still get the effect! To fix this, add a last command block that constantly sets the "holding" score of a player to 0. Make SURE this comes AFTER the first two, otherwise it could mess up the machine. Use this command: /scoreboard players set @a holding 0


Things to consider: This is my single player world, and I'm on a team, hence the translucency of my invisibility effect. Also, the sidebar is displaying as "holding" as 0, even when I'm holding it. Doesn't matter, still works. >:)



If you're struggling with redstone or need help, feel free to contact me via PMC.

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 Too da loo!