Questions tagged [web3js-v1.x]
For questions specifically about version 1.x of the web3js Javascript API and library for Ethereum
59
questions
1
vote
1answer
18 views
How can you work around Web3 1.0s bug to check for transaction confirmation?
The following includes a null Tx id:
web3.eth.getTransaction('0x2fc36f9c6593bc1232b3466832c6ee38b5b2b3b4a54be3f6c68fb06e8d82e452', function(error, result){
if (!error) {
console.log(result....
1
vote
1answer
86 views
How Can You Find the Ethereum Provider on Web3 Browsers Other Than MetaMask?
MetaMask provides the following way currently to find a provider for their upcoming 2020 breaking change:
// Running on the page, in the browser
// This API will go live in Q1 2020
// It will be the ...
0
votes
0answers
11 views
How do you recover in web3.js 1.2 a message signed with web3 0.2? [duplicate]
MetaMask injects 0.20 and you can't switch it off or mix web3 versions (not easily anyway). I am forced to use this method for signing:
web3.personal.sign(web3.fromUtf8(nonce), web3.eth.coinbase)
It ...
0
votes
0answers
13 views
mobile web3 v1.0 not listening to events
I'm able to listen to contract events on desktop but it's not listening on mobile (coinbase wallet).
const contractInstance = new web3.eth.Contract(abi, contractAddress);
contractInstance.events....
1
vote
0answers
28 views
Help me fix Error: No “from” address specified in neither the given options, nor the default options. I'm use MetaMask
file web3.js
import Web3 from 'web3';
const web3 = new Web3(window.web3.currentProvider);
export default web3;
file image.js
import web3 from './web3';
const address = '...
0
votes
1answer
38 views
How to return the result of a Solidity view method from a javascript function?
I want to determine a view function of a smart contract result in web3js 1.x
Suppose we have a view function getName(uint code) and want to get the name of a person having his code. So we write:
...
1
vote
0answers
35 views
Solidity calldata for an array of structs
I'm trying to create the calldata offchain for an on-chain low-level call to a method that accepts an array of structs as an argument. I'm not sure how to encode the calldata for this.
Here's a ...
1
vote
2answers
40 views
Insufficient funds when transferring ERC-20 token using web3
I am trying to send an ERC-20 token on Mainnet using web3 v1.x and Infura. I get the error in the title while executing this code.
I have a balance of about 0.14 ETH
var provider = new ...
1
vote
2answers
23 views
How to provide data for sendTransaction using web3.js 1.0
I'm using web3.js 1.0. I want to use sendTransaction method to call a contract method, but I don't know how to provide data parameter for it.
For example suppose we have a contract named myContract ...
0
votes
1answer
39 views
Transaction being reverted by EVM during contract creation (Web3 / ethereumjs-tx)
Hey guys I am running into an issue deploying a smart contract with Web3 to the Ropsten network. The code is running seemingly correctly, and there is a contract address being created, but if I check ...
0
votes
0answers
23 views
subscriptions in Geth or Parity
I am trying to get the way to register subscriptions to events, with the services of QuikNode I can do it without problem and it is working perfect, but I am trying to raise a node --light with geth ...
0
votes
1answer
32 views
Web3 balance is showing OmiseGo balance but not Bitball
You can see on Etherscan that I have 2 types of tokens in my wallet:
https://etherscan.io/address/0xb8fd65fc6919c5b97453eaba6b895144597985b2#tokentxns
2.3 OmiseGo and 10,000 Bitball
I have a short ...
1
vote
2answers
775 views
Web3 CDN error: regeneratorRuntime is not defined
When I include the web3 js CDN to my html file, I receive this error
web3.min.js:1 Uncaught ReferenceError: regeneratorRuntime is not defined
at Object.<anonymous> (web3.min.js:1)
Here is ...
0
votes
0answers
26 views
invalid JSON RPC when using custom domain name
geth --testnet --networkid 3 --syncmode "fast" --datadir "." --cache=2048 --rpc --rpcport 8545 --rpcaddr example.ropsten.hk --rpcvhosts example.ropsten.hk --rpccorsdomain "*" --rpcapi="web3,miner,...
0
votes
1answer
305 views
problem connecting web3 v 1.2.1 with metamask : 'currentProvider' of undefined
I am using Web3 v1.2.1 with nodejs v10 and following this link. I am having issue connecting with metamask,below is my code snippet:
const Web3 = require('web3')
const window = require('window');
...
2
votes
1answer
128 views
Which version of web3 shall i be using now?
I found the documentation of version 1.0.0 which was released on the 6th of August here. I was told that v1 is not stable and very different than earlier versions. But when i check the available ...
0
votes
1answer
65 views
Where Do I Find web3.min.js for Beta 55?
There is this issue on github (among several other duplicate complaints): https://github.com/ethereum/web3.js/issues/2623.
There is also this stack question: How can the web3 library be imported in ...
0
votes
1answer
110 views
Why Web3 event callback fires multiple times same as the number of the solidity smart contract emitted that event in past?
I am just learning, solidity with react and web3 and I am facing the issue on page load the callback event of web3 called multiple time the number is same as I called a solidity function and that emit ...
0
votes
1answer
64 views
How does .on work in Web3 1.0, and why do I get duplicate results?
I don't understand what .on event handler does in Web3. Take this example for signing a transaction:
web3.eth.sendSignedTransaction('0x' + serializedTx.toString('hex'))
.on('...
1
vote
1answer
57 views
How do I asynchronously wait for Contract.events.MyEvent data to be returned in Web3 1.0?
The documentation is sparse, and the examples all mix async, arrow callbacks, and promises. One problem I've run into is while subscribing to an event, I can't seem use asynchronous syntax within or ...
3
votes
2answers
87 views
What happened to the official documentation of web3.js v1.0?
It should be at https://web3js.readthedocs.io/en/1.0/, but now I'm getting this:
Does anybody happen to know why this wonderful tool has been taken off line?
0
votes
1answer
100 views
How Do You Parse Web3 Retuned JSON Objects of Events?
I am using Web3 1.0 to listen to events from a contract like this:
tokenContract.events.AddressList({
fromBlock: 6020474,
toBlock: 'latest'
},
(error, events) => {
...
0
votes
1answer
35 views
Does web3.eth.wallet.create set the newly created wallet file as the 'global' source of addresses for the web3 instance?
I'm playing about with web3js@1.0.0-beta.55 and I'm setting an HttpProvider on Ganache for my web3 instance:
this.web3Instance = new Web3(new Web3.providers.HttpProvider(environment.ethereum.provider)...
0
votes
0answers
59 views
How to get web3.eth.getPendingTransactions on JavaScript?
I read in the official document for web3js v1
https://web3js.readthedocs.io/en/1.0/web3-eth.html#getpendingtransactions
getPendingTransactions
web3.eth.getPendingTransactions([, callback])
...
0
votes
1answer
102 views
miner.start() is not a function?
"web3": "^1.0.0-beta.37"
"web3": "^1.0.0-beta.55"
import {Miner} from 'web3-eth-miner';
then
const options = {
defaultAccount: "0x78dB3e2129D58685444989dD9682DDDC70dd3C82",
...
0
votes
0answers
79 views
How to get the value from the frontend form and save value to the blockchain using +web3 1.0.0-beta.37 + reactjs
I am writing my first Dapp and want to save the value of the form to the blockchain. I am Using React and web3 js 1.0.0-beta.37 on the frontend. Also I am new to react.
Following is my App.js
...
1
vote
2answers
167 views
Why web3.version.api shows undefined for web3 1.0 and not undefined for web3 0.20.3?
I'm trying to use MetaMask and web3js to talk to my smart contract. Below are my test codes.
This is without defining a web3 js file and I get the result "0.20.3" at console.
<script>
window....
0
votes
1answer
93 views
What's the difference between web3.eth.personal and web3.eth.accounts?
I noticed that web3.eth.personal has unlockAccount method but not web3.eth.accounts. Why not?
Is web3.eth.personal for personal or single account use while web3.eth.accounts for multiple accounts?
0
votes
2answers
142 views
web3 1.0 events never fire
First off, my setup.
System: ArchLinux
Ganache: v2.0.0 (correction, v1.3.1)
Solidity: 0.5.8
web3: 1.0.0-beta.37 (anything higher than 37, contract wont deploy)
Node: 'latest'
Some background and ...
0
votes
2answers
2k views
SyntaxError: await is only valid in async functions and async generators in web3js [closed]
Below is my code snippet. I wish to wait for the transaction hash value so that I can return my Javascript function with the hash value.
But I get the error "SyntaxError: await is only valid in ...
0
votes
0answers
82 views
Problem with send method in Infura
Newly Infura site has been changed its interface.
Before that all methods of our client program was successfully working, but now when I logon to Infura, all whitelists has been removed. I added our ...
1
vote
1answer
35 views
using web3 1.0 for approving signed transaction before appending to the blockchain
I am making a dapp using web3 1.0. I have a contract that stores medical data for every patient (represented by account). Their medical data can be set by doctor (account address) using the set ...
1
vote
1answer
117 views
Cannot deploy contract
I'm having difficulty deploying a solc-compiled contract to ganache test network using web3.
package.json
{
"name": "smartinvoice",
"version": "1.0.0",
"description": "",
"main": "index.js",
...
0
votes
1answer
110 views
Unlocking account web3.js 1.0 on AWS Lambda
I'm getting following error message when trying to unlock account on AWS Lambda:
Error: Node error: {"code":-32601,"message":"The method personal_unlockAccount does not exist/is not available"}
...
0
votes
2answers
31 views
timed transactions using web3-1.0
I am creating a dapp using web3-1.0. I have a contract that stores personal data for a particular user(account). I want to implement a functionality so that a user can share his data (stored in the ...
0
votes
0answers
185 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
3answers
406 views
How to check if the address is an ERC20 contract?
edit) VM execution error was a bug on Web3, confirmed my code works fine.
I am trying to fetch random addresses from blockchain and trying to categorize them if it is an ERC20 contract address or not....
2
votes
1answer
100 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/...
1
vote
1answer
98 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
675 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
86 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
116 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
183 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
1answer
249 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
661 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
40 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
247 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
176 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
29 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();
...
2
votes
1answer
2k 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') {...
