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ViewsHow to get Transaction Receipt Event Logs?
I need to get the events emitted by my smart contract and consume them in the front end via web3.
I made some event on my contract that returns event winner and ticket number:
event Winner(uint256 ticketNumber, address winner);
So I emit this event, and I see it on transaction logs.
From Etherscan:
OK! What I need is the data: ticketNumber: 1, winner: 0x........ How did I get this from web3?
Im trying to use:
await web3.eth.getTransactionReceipt(txnHash, function (error, result) {
console.log(result);
});
But when I check console log, I cannot see this information, I suspect that result.logs.data is the right info, but I don't know for sure, and I don't know how to translate:
"0x00000000000000000000000000000000000000000000000000000000000000010000000000000000000000005964b608ea267bfe9ef77707fce8105a2d145e7a"
Anybody have an idea?
1 answers
Answer question0
If you read the docs, there is getPastEvents method.
myContract.getPastEvents('MyEvent', {
filter: {myIndexedParam: [20,23], myOtherIndexedParam: '0x123456789...'}, // Using an array means OR: e.g. 20 or 23
fromBlock: 0,
toBlock: 'latest'
}, function(error, events){ console.log(events); })
.then(function(events){
console.log(events) // same results as the optional callback above
});
you can also create event listeners:
contract.events.Winner()
.on('data', (event) => {
console.log(event);
})
.on('error', console.error);
Docs about subscription to events