Starts when · Starts a flow
Before a dispenser shoots
Starts just before a dispenser or dropper fires an item. Cancel it to stop the shot.
m.on.block_pre_dispense
In a flow
“When before a dispenser shoots, the steps wired after it run.”
When block pre dispense → Broadcast {trigger.slot}
What it does
Starts just before a dispenser or dropper fires an item. Cancel it to stop the shot. It starts a flow, and gives the steps after it values about what happened. It gives 3 values later steps can use. Find it under Starts when in the palette.
When to use it
Use it to start a flow when before a dispenser shoots.
When not to
If the flow should start from a click or a command instead, pick that trigger: a flow has exactly one.
Typical wiring
Values it gives
- Block Block
-
The block of the block pre dispense. e.g. Stone
If it's empty: Empty when the step didn't make one (it stopped early or was skipped); steps reading it get nothing.
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- Item stack Item
-
The item stack of the block pre dispense. e.g. 1× Stone
If it's empty: Empty when the step didn't make one (it stopped early or was skipped); steps reading it get nothing.
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- Slot Number
-
The slot of the block pre dispense. e.g. 1
If it's empty: Empty when the step didn't make one (it stopped early or was skipped); steps reading it get nothing.
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