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I have [email protected] installed using npm . when I call web3.eth.contract() it says that it is not a function and when I use new web3.eth.contract it says it is neither a constructor. This is my code

<!DOCTYPE html>
<head>
    <script src="./node_modules/web3/dist/web3.min.js">
    </script>
</head>

<body>
<input name="choice" type="text"> Vote: </input>
<button id="submit">Submit : </button>
</body>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script>

    if (typeof web3 !== 'undefined') {
        web3 = new Web3(web3.currentProvider);
    } else {
        // set the provider you want from Web3.providers
        web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"));
    }

// Previous if/else statement removed for brevity

web3.eth.defaultAccount = web3.eth.accounts[0];
var vote=  web3.eth.contract([
    {
        "constant": true,
        "inputs": [],
        "name": "c4",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    },
    {
        "constant": true,
        "inputs": [],
        "name": "c2",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    },
    {
        "constant": true,
        "inputs": [],
        "name": "c1",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    },
    {
        "constant": false,
        "inputs": [
            {
                "internalType": "uint256",
                "name": "x",
                "type": "uint256"
            }
        ],
        "name": "set",
        "outputs": [],
        "payable": false,
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "constant": true,
        "inputs": [],
        "name": "c0",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    },
    {
        "constant": true,
        "inputs": [],
        "name": "get",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            },
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            },
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            },
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            },
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            },
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    },
    {
        "constant": true,
        "inputs": [],
        "name": "c5",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    },
    {
        "constant": true,
        "inputs": [],
        "name": "c3",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "payable": false,
        "stateMutability": "view",
        "type": "function"
    }
],'0x1def5958505131be74680211266cd0667b3fc75d');

console.log(vote);


</script>
</html>

Please can someoneone find error in it ?

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3 Answers 3

Reset to default
0

For web v0.20 creating a reference to an existing instance should be done in two steps

// Create contract object
var MyContract = web3.eth.contract(abiArray);

// Reference instance
var contractInstance = MyContract.at(address);
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1

I believe that you're actually on web3 v1.x, in which case, you should indeed be using new web3.eth.Contract, but with a capital C.

In order to verify which version of web3 you're on, run npm ls web3 from a command line or console.log(web3.version) from your JS code.

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11
  • Done ! Not working constructor is used in [email protected] or 1.0.0 ! it was used as a function in 0.20.6 ! Am i right ?
    – Somil gupta
    Commented Nov 11, 2019 at 14:21
  • @Somilgupta: See updated answer.
    – goodvibration
    Commented Nov 11, 2019 at 14:22
  • PS C:\Users\somil\attempt> npm ls web3 [email protected] C:\Users\somil\attempt `-- [email protected]
    – Somil gupta
    Commented Nov 11, 2019 at 14:26
  • @Somilgupta: Are you trying to tell me something here? Because if you do, then it is unreadable!
    – goodvibration
    Commented Nov 11, 2019 at 14:27
  • i was just trying to tell you its [email protected] . But i ll try as constructor too tysm !! if it doesnt work i ll get back to you !
    – Somil gupta
    Commented Nov 11, 2019 at 14:29
0

If you are using [email protected], you can look at API Documentation how to create a contract object and initiate it on an address.

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