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
How to get the return value of call methods in web3 v1?
As explained here, when we use web3 v1, we need to use a different way of calling functions (either to read the staet by call() or execute a function by sending transaction).
It is not clear how we ...
0
votes
1answer
29 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
15 views
Scope in events in web3 1.0 [on hold]
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
28 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
26 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....
0
votes
0answers
19 views
HTML file created in truffle setup is not getting launched in chrome
I have used truffle to compile the contract and create the ABI files. Now I need to point the ABI files in the HTML file. I have used the HTML code as mentioned below
Question
When I executed in ...
-1
votes
0answers
30 views
how to convert params to bytes in javascript and parse uint256 from bytes in solidity
for example: user call this function from javascript.
function receiveApproval(address _from, uint256 _value, address _token, bytes _extraData)
How can I put these three uint value to bytes and ...
1
vote
1answer
22 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
102 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
votes
0answers
35 views
Setting a contract's address in web3/truffle instantly stops execution of React App
Not sure what I'm doing wrong....
Just updated to Web3 v1.x.x from 0.20.7 and now I cannot instantiate this ONE contract.
Every time I call the contractInstance to set its address (after setting ...
-1
votes
0answers
40 views
Error while using websocket provider in web3 version 1.0.0-.beta.35 “not websocket protocol”
new web3(new web3.providers.WebsocketProvider('ws://localhost:8546'))
I am getting the error like not websocket protocol
1
vote
1answer
11 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
81 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
50 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
38 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
50 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
18 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
22 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
33 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 ...
