I want to do a transaction from my website to a private blockchain and inform the user after the transaction is done. This is my code so far:

const web3 = new Web3(new Web3.providers.HttpProvider("http://<ip>:8545"));

// It's simple contract with just two functions (setA(string), getA()).
const A = web3.eth.contract("<abi>");
const contractInstance = A.at('<contractAddress>');

console.log("Call: " + contractInstance.getA()); // this is working

    {from: web3.eth.coinbase},
    (error, result) => {
        if(!error) {
            console.log(result); // this is working, I get a TX string from here

            // I got this from the documentation.
            // here I'm note sure if this is the right way to do it....
            web3.eth.getTransactionReceipt(result, (error2, result2) => {
                     console.log(result2); // this is not working

        } else {

Calling my contract is working fine, and sending the transaction is working as well. The only missing part is setting a callback to notify the user after the transaction is written into a block. Can someone tell me how to do it?

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