Retrieve block index after transaction is sent

Question

I am a developer integrating Polkadot JS to my app. I am creating an offline transaction which I am sending via the Polkadot Api RPC. In return I get the txid, but it does not help me to retrieve the transaction once it is mined. I need to get the block index and the extrinsing index in the block that the transaction will be mined. I am using the HTTP provider, the websoccet will not work for me. Can you guide me in the right direction?

Best regards!

Answer 1

If you just have transaction hash, note that is not a unique identifier for a transaction in Polkadot, check this answer.

What you can do is a function with PolkadotJS that is listening to the events to see where your transactions has been included.

Simple script:

// Subscribe to system events via storage
api.query.system.events((events) => {
  console.log(`\nReceived ${events.length} events:`);

  // Loop through the Vec<EventRecord>
  events.forEach((record) => {
    // Extract the phase, event and the event types
    const { event, phase } = record;
    const types = event.typeDef;
    console.log(event.toHuman());
  });
});

If as Oliver suggest you use signAndSend is easier, check this answer on StackExchange