Get emitted events of a a smart contract function using infura

Questions
1

I have used infura in my App.js to connect to the kovan network. Then I am creating an instance of the smart contract deployed on that network. Then I am calling a function on that smart contract which emits an event.

This returns a transaction hash but I want to access the event details emitted by that smart contract function. I thought I might use that transaction hash on kovan etherscan site and get the event details emitted but it didnot work. How do I access them?

I have sent a signed transaction through infura:

const Tx = require('ethereumjs-tx').Transaction

    // connect to Infura node
    const web3 = new Web3(new Web3.providers.HttpProvider("//kovan infura key"));

    // the address that will send the test transaction
    const addressFrom = '//myaccountaddress'
    const privKey = '//my key'

    // the destination address
    const addressTo = '//contractaddress'

    function sendSigned(txData,cb) {
      const privateKey = new Buffer.from("privateKey", 'hex')
      const transaction = new Tx(txData)
      transaction.sign(privateKey)
      const serializedTx = transaction.serialize().toString('hex')
      web3.eth.sendSignedTransaction('0x' + serializedTx,cb)
    }

    const contract = new web3.eth.Contract(Contract.abi,Contract.address, {from: addressFrom,gasLimit: 3000000});
    const contractFunction = contract.methods.getDetails(0);

    const functionAbi = contractFunction.encodeABI();

    web3.eth.getTransactionCount(addressFrom).then(txCount => {

      const txData = {
        nonce: web3.utils.toHex(txCount),
        gasLimit: web3.utils.toHex(25000),
        gasPrice: web3.utils.toHex(10e12), // 10 Gwei
        to: addressTo,
        from: addressFrom,
        data: functionAbi
      }

       sendSigned(txData, function(err, result) {
      if (err) return console.log('error', err)
      console.log('sent', result)
    })
2

Hello @ShivamRaina, welcome to the community!

To watch for emitted contract events you’ll want to set up a subscription filter. For example, to watch for transfer events, read this article on Ethereum transaction subscriptions, and use web3.eth.subscribe to watch each new block for transfer events of the accounts you care about. https://medium.com/pixelpoint/track-blockchain-transactions-like-a-boss-with-web3-js-c149045ca9bf

You can subscribe to any contract event that you care about.