Canceled

Event v133 → current #1

Emitted when a scheduled task is cancelled before execution.

View events on chain

Useful for: developersanalytics

The Big Picture

Confirmation that a scheduled task has been removed and will not execute.

Use Cases

Confirm task cancellation
Track cancelled operations

From Chain Metadata

Canceled some task.

Triggers

Emitted by

cancel cancel_named

Preconditions

Cancel call succeeded
Task existed at specified position

Effects

Storage Modified

Agenda Lookup

Postconditions

Task removed from Agenda
Will not execute

Side Effects

Deposit returned if reserved

Event Data

#	Name	Type	Description
0	when	u32	Block number where the task was scheduled
1	index	u32	Index of the cancelled task within the block's agenda

Code Examples

import { ApiPromise, WsProvider } from "@polkadot/api";
import { stringCamelCase } from "@polkadot/util";

const provider = new WsProvider("wss://entrypoint-finney.opentensor.ai:443");
const api = await ApiPromise.create({ provider });

// Subscribe to Canceled events
api.query.system.events((events) => {
  events
    .filter(({ event }) =>
      event.section === stringCamelCase("Scheduler") &&
      event.method === "Canceled"
    )
    .forEach(({ event }) => {
      console.log("Canceled:", event.data.toHuman());
    });
});

Runtime Info

Pallet Index: 15
Event Index: 1
First Version: v133
Current Version: v393

Back to Scheduler Events