Test if player has specific item in specific hotbar slot [1.8]

Test if player has specific item in specific hotbar slot [1.8] - Photo of Clear Glass Measuring Cup Lot

How can I test for a player that has a wooden button in his 1st hotbar slot? (no matter if selected or not).

I tried:

/testfor @a {Inventory:[{Slot:0,id:"minecraft:wooden_button"}]}

But the command block outputs:

[player name] did not match the required data structure






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How do you test an item in a slot in Minecraft?

In the survival inventory tab of the creative inventory, shift + clicking the 'X' clears the whole inventory in any other tab, shift + clicking an item puts a stack into the hotbar.



Test for Items In A Certain Slot Minecraft 1.8




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