I’m trying to call the createCustomer function provided in this smart contract https://ropsten.etherscan.io/address/0xD3B462CbF6244ed21CD3cF334Bf8CB44A28795A9#code
and we basically have to provide three parameters like string memory _hashedEmail, string memory _name and string memory _phone.
So I’ve written the following program to call the createCustomer function
const addcustomer = async (req, res, next) => { try { const init = async() => { const provider = new HDWalletProvider( privateKey1, 'https://ropsten.infura.io/v3/1693cef23bd542968df2435f25726d39' ); const web3 = new Web3(provider); let contract = new web3.eth.Contract(abi2, address3); contract.methods.createCustomer({_hashedemail: "a", _name: "nike", _phone: "99"}).call((err, result) => { console.log(result) }); }; init(); }catch (err) { //throw error in json response with status 500. return apiResponse.ErrorResponse(res, err); } };
However it gives me this err which doesnt make any sense as i’ve already provided the three paramaters.
(node:14744) UnhandledPromiseRejectionWarning: Error: Invalid number of parameters for "createCustomer". Got 1 expected 3!
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Answer
Remove the {
}
inside createCustomer
.
So to be clear, this line:
contract.methods.createCustomer({_hashedemail: "a", _name: "nike", _phone: "99"})
should be:
contract.methods.createCustomer(_hashedemail: "a", _name: "nike", _phone: "99")
plus, when you try to interact with a function that modify the blockchain you shouldn’t call it using .call
but instead with .send
.
To learn more you should check the web3.js docs