Questions tagged [web3js-v1.x]
For questions specifically about version 1.x of the web3js Javascript API and library for Ethereum
0
votes
0answers
6 views
Error: Invalid bytes string given: 0x
Contract code:
function getAddressDnaIds(address owner) external view returns(uint256[])
{
return addressDnaIds[owner];
}
Code causing the error:
var dna = await this.airdrop.methods....
1
vote
1answer
26 views
How to check if the address is an ERC20 contract?
I am trying to fetch random addresses from blockchain and trying to categorize them if it is an ERC20 contract address or not.
I've tried with web3.eth.call to check if the contract has a method ...
2
votes
1answer
25 views
Clarification on “password” argument for web3.eth.personal.sign
Context: I'm fairly new to web3, and as we all know it's developing quite regularly. I'm working towards a "sign in with Metamask"-type functionality using web3@1.0.0-beta.46.
Most of the docs/...
0
votes
1answer
34 views
Web3 .call not returning “valid value”
Low level function calls work in Truffle, Solidity is not the problem.
Other method invocations are working with the JS and HTML.
This is my first attempt at using .call instead of .send; I am not ...
0
votes
1answer
127 views
How to deploy a smart contract using Infura and web3js@1.x.x on NodeJS?
I have an application written in NodeJS that each time it starts has to deploy a smart contract. Once the contract is deployed this application will interact with it making some transactions and ...
0
votes
0answers
20 views
Unable to transfer token from one personal account to another
I have created two personal account on private blockchain with geth.
This is the balance of one account
web3.fromWei(eth.getBalance(eth.accounts[0]), "ether");
100000000000
And this is of the ...
0
votes
1answer
29 views
how to find if a Tx hash is in pending state in ethereum mainnet after web3j fastTxMgr timeout
I am using QueuingTransactionReceiptProcessor() with callback accept(). DEFAULT_POLLING_ATTEMPTS_PER_TX_HASH is 10 and POLLING_FREQUENCY is 15000. That gives nearly 3 min wait for network to ...
1
vote
0answers
91 views
using events in private blockchain raises leveldb not found error
i'm getting { [Error: Node error: {"code":-32000,"message":"leveldb: not found"}] when trying to use events on a private eth blockhain.
What might be the problem? (I've installed Leveldb with brew)
...
0
votes
0answers
68 views
UnhandledPromiseRejectionWarning: Error: “gas” is missing
How can I catch exception thrown by method call?
(async () => {
try {
const contract = await MyContract.deployed();
const gasPrice = await web3.eth.getGasPrice();
contract....
0
votes
1answer
97 views
Contract.methods.transfer is a not a function error using web3
Running something simple as this:
Contract = new web3.eth.Contract(this.contractABI, this.contractAddress)
Contract.methods.transfer(toAccount.address, transfferAmount).encodeABI()
Gives me ...
1
vote
1answer
31 views
Scope in events in web3 1.0 [closed]
Inside the callback of an event, how do I get the scope outside the function? Specifically, in the following scenario, I want the web3 object:
(using truffle-contracts and web3 1.0 here)
...
const ...
0
votes
1answer
92 views
How to get private key with web3 v0.2.x?
web3 version 1.x has the decrypt method, which decrypts a keystore v3 JSON.
By using it the following way, I can get the private key easily:
web3.eth.accounts.decrypt(keystoreJsonV3, password);
But ...
1
vote
0answers
51 views
web3js 1.0 fromWei throwing although passing correct type
I have encountered a problem with the web3js 1.0 library.
I have a simple function that is getting a balance from a smart contract:
async balance() {
return await this.Marketplace.balances(this....
1
vote
1answer
24 views
How can I create a copy of an existent contract in Javascript ?
I'm trying to create a copy of an contract existent contract using web3.js 1.0. I'm trying to use the functions clone and deploy but without success.
contract2 = contract1.clone();
...
0
votes
1answer
389 views
How to connect web3.js 1.0.x to Metamsk
I am using web3.js 1.0.0-beta.36 to connect to the blockchain.
But unfortunately this code cannot connect to Metamask, if it has been enabled.
var metamask = false;
if (typeof web3 !== 'undefined') {...
1
vote
1answer
17 views
Issues connecting Web3js to local testnet
I am trying to connect web3 to a testnet running locally. I am using the following code
var web3 = new Web3(Web3.givenProvider || "ws://localhost:8546");
var account = '...
0
votes
1answer
130 views
web3.js-1.0.0-beta.36 - I can not connect to INFURA
Help with the solution
Installed the web3.js-1.0.0-beta.36 package on the hosting server.
Register and receive from Infura https://mainnet.infura.io/v3/myadress
3.Where and what should I register to ...
0
votes
2answers
132 views
Getting error while deploying with web3 version 1 using async wait
I am trying to deploy my code to Infura network i compiled and i got no errors but now when i am trying to deploy i am getting error
const HDWalletProvider = require('truffle-hdwallet-provider');
...
0
votes
1answer
70 views
web3js (v1.0.0-beta36) unable to use - Cannot find module 'buffer'
I included dist/web3.js (1.0.0-beta36) in my html file as below
<script type="text/javascript" src="./web3.js"></script>
<script type="text/javascript">
var Web3 = require('web3'...
0
votes
1answer
99 views
How to sign a transaction using web3 1.0?
When trying the following code I will get an an wrong JSON RPC response.
const fnc = myContract.methods.transferToken(...).encodeABI();
const tx = Object.assign({
nonce: nonce,
...
1
vote
0answers
20 views
Unable to install web3-eth-ens while installing web3-version 35
I had web3 ver 36. Due to an issue, I rolled back to ver 35 as follows -
npm install -g web3@1.0.0-beta.35 --save
Before this, I did npm cache clear --force. However, it looks like web3-eth-ens is ...
0
votes
1answer
31 views
Web3js 1.0 events: closing the contract.events “socket”
My code is the following:
contract.events.Deposit({}, function (err, event) {
if (err) {
console.error;
} else {
console.log(event.blockNumber);
}
})
.on('data', ...
0
votes
1answer
47 views
how to get previous transaction history for a particular address web3js1.0.0 [duplicate]
web3.eth.getPastLogs({
fromBlock : 3150168,
toBlock : 3153168,
address: "0xAD08C190Ed643ec60afBbAEB2E284F616F3C3b43",
topics: [topics]
})
.then(result=>{})
.catch(error=>{})
how ...
4
votes
1answer
1k views
SendSignedTransaction web3 v1.0 smart contract method call
Running parity node, connected to Kovan testnet.
Contract Address: 0x354Db5AE17b11fbc01A8a146B63506b1d90872E0
Using a nodejs app + web3 to send/sign transactions with the private key corresponding to ...
