how can I get the data returned from solidity function from transaction id in web3js when a solidity function is callled?

Question

I want to get the return data written in solidity function in web3js . I am using the web3.min.js from the truffle pet-shop package as the web3 library . Everything is working fine when calling the function it is returning the transaction data from which I used web3.eth.getTransactionReciept to get the details and the gas is also used. Now I want the data which is returning my solidity method

 function helloworld() public returns (string) {
        return "helloworld";
    }

The js part

<script>

    if (typeof web3 !== 'undefined') {
    web3 = new Web3(web3.currentProvider);
    } else {
    web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:7545"));
    }
    web3.eth.defaultAccount = web3.eth.accounts[0];
    console.log('web3.eth.accounts :', web3.eth.accounts);
    var walletContractJSONabiGlobal;
    $.getJSON('./contracts/Wallet.json',async function(walletContractJSONabi) {
        walletContractJSONabiGlobal = walletContractJSONabi;
        var walletContract = web3.eth.contract(walletContractJSONabi.abi);
        var walletInstance = walletContract.at('0xc74c8d941494495a4f65c42bebc556398e1f028d');
        walletInstance.helloworld((err,data)=>{
            if (err) {
                console.log('err :', err);
            } else {
                console.log('data :', data);
            }
        })

    })

</script>

I getting the data in console

data : 0x988d4bd3169a4d752f6e4ac230d01840f2f7b4cc8e87d768a8e41b6fe867740d

I did the web3.toAscii(this transaction is) but it is not coming proper result which is expected as this is not a hex value

When output of web3.eth.getTransactionReciept

blockHash : "0x552a93b0035571b93e4a1a89daa445663b0ddb29974078cdf9a250b7f873ca96" blockNumber : 10 contractAddress : null cumulativeGasUsed : 21899 gasUsed : 21899 logs : [] logsBloom : "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000" status : "0x01" transactionHash : "0x988d4bd3169a4d752f6e4ac230d01840f2f7b4cc8e87d768a8e41b6fe867740d" transactionIndex : 0

Please Help in this Thank YOu

Answer 1

This may be marked as a duplicate, so just to help you out. You can't.

The return values are only available to other contracts. As a software client signing and sending a transaction, you get a transaction receipt and then after waiting for the transaction to be mined, you can inspect the logs of inspect other functions on a read-only basis (either the contract function is view or pure, or you invoke it with the JavaScript .call() method) to discover what's new in the contract state. The return values of the state-changing function are out of reach.

Hope it helps.