Questions tagged [javascript]
JavaScript is a dynamic, weakly-typed language used for client-side as well as server-side scripting.
963
questions
0
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1answer
15 views
I am getting the following error : RPC Error: Invalid parameters: must provide an Ethereum address
I am getting the following error: RPC Error: Invalid parameters: must provide an Ethereum address.
It is a simple code to send transactions using a metamask chrome extension.
<script>
let ...
1
vote
1answer
12 views
Encryption using public key from eth_getEncryptionPublicKey metamask function
I'm trying to encrypt data/files before uploading them to IPFS and I want to do this using metamask provided public and private keys. For this, I have tried using eth_getEncryptionPublicKey but this ...
0
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1answer
14 views
Calling a solidity function without a wallet using ethers.getDefaultProvider
I am trying to call a function from my solidity contract which shows how many nfts have been minted so far, I want the front end user to be able to see the number even if they don't have a wallet in ...
0
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1answer
16 views
How to verify allowed addresses using a Merkle Tree in Node.js [closed]
I have set up a server using Node.js and Express. I am unsure if I need a database but I do have MongoDB available if needed.
The method I'm trying to do is to capture the wallet address from the ...
0
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0answers
74 views
disconnect wallet from metamask using ethers js
I've created a website on WIX (a web editor) and thought that I could add my code to engage with metamask and the smart contract that I've created, turnes out that wix doesn't support web3 so I ...
0
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0answers
9 views
Deploying smart contract using vanilla JS with existing bytecode
I'm not sure if it's possible to deploy a new smart contract using plain Javascript if I include the bytecode and ABI. I copied and paste my ABI and bytecode below at MEW and I could deploy them.
But ...
0
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0answers
11 views
Web3js Deploy contract is asking two transaction confirmation on metamask
I am new to web3js and trying to deploy smart contract using metamask. During the deployment, I am receiving two times the transaction confirmations from metamask. Could someone please help me.
import ...
0
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1answer
40 views
[SOLVED]: CANNOT find my pending transactions using: ether.js & [provider.on("pending") and provider.getTransaction(tx)]
I am using Quicknode and ether.js to monitor pending transactions using the following code:
provider.on("pending", async (tx) => {
provider.getTransaction(tx).then(function (transaction)...
0
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0answers
29 views
Retrieve wallet address after connecting Metamask with Web3.js
I got this code off github which allows you to connect to MetaMask using web3.js and also to make payment. I then modified it to
Display a Connect Button when user is not logged in by checking if the ...
1
vote
1answer
104 views
If a function returns two or more values and I wish to use one of the two in another function, how do I do that?
I have a function xyz :
uint256 a;
uint256 b;
function xyz() internal view return(uint256,uint256){
return (a,b);
}
Now, I wish to use the first return value in another function (for eg):
uint256 c;
...
0
votes
1answer
17 views
EthersJS JSON to sha256: Error string too long
what I'm trying to accomplish is creating a hash of a JSON object. This will then be used as a bytes32 parameter when minting a token.
I thought the best way to go about this is to first stringify a ...
0
votes
1answer
29 views
How to handle MetaMask disconnecting from dapp?
How do you detect when a MetaMask user disconnects their wallet from your dapp? I see there is a disconnect event, but this is a for disconnecting from RPC - I want to know when the user has ...
0
votes
1answer
23 views
swapExactTokensForTokens not working!
We are trying to "swapExactTokensforTokens" for swapping any token, and it runs well, but we get this error at the blockchain:
TRANSFER_FROM_FAILED
https://polygonscan.com/tx/...
0
votes
1answer
21 views
Store PrivateKey in webapp to send in transaction
I have a big question regarding the security of my system.
Well, what happens.. I developed my contract using ECDSA, that is, it is only possible to do actions in my contract if the transaction is ...
0
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0answers
21 views
Trying to use an Alchemy Websockets address to subscribe to an event but it errors out when it tries to update
Here is the script:
const Big = require('big.js');
const blk = require('./blockchain');
const UniswapV2Pair = require('./abi/IUniswapV2Pair.json');
const cc = require('./common_code');
const ...
0
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0answers
14 views
Why ISN'T my GUI interacting with my smart contract?
I successfully deployed an Ethereum smart contract within the Web3 Provider environment, and I am able to successfully interact with the various functions only via the Remix IDE.
Find below my ...
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0answers
6 views
Ethereum app looking at wrong Address from Migrations.json
I developed a webapp for ICO's (KOVAN TESTNET). It works just fine locally but when I push the files to my live site, it uses a different address for my sales contract. it is fine for my token ...
0
votes
1answer
30 views
Check if NFT tokenURI is an image or a video
Is there a way to check if the file I'm loading as a URI is an image or a video.
so that I can use 'img' tag for the images and 'video' tag for the videos.
1
vote
1answer
12 views
Transaction not created by ethers.js
I have written the following code to try to mint an NFT based on some git repos I saw. The code runs successfully and outputs a transaction hash, but the hash never resolves to anything on Rinkeby ...
1
vote
0answers
26 views
Cannot run default JS script from within Remix?
just getting started with Remix.
I want to run the default deploy_ethers.js script and see there are two ways to do it:
Right-click on the script and hit "Run".
Open the file and run remix....
1
vote
1answer
20 views
Why doesn't Truffle's testing framework automatically retrieve fresh values of public state variables after every interaction with the contract?
I have the following simple smart contract defined:
contract LoanApplication {
struct Applicant {
bytes32 ssn;
bool hasApplied;
}
struct Loan {
string loanID;
uint ...
0
votes
1answer
56 views
encode_abi encode function call
I am trying to convert Javascript code to Python and believe the equivalent "web3.eth.abi.encodeFunctionSignature" function in JS to encode ABI in Python is with the "encode_abi" ...
0
votes
1answer
15 views
smart contract function not returning correct results when invoking from javascript
// SPDX-License-Identifier: MIT
// solium-disable linebreak-style
pragma solidity >= 0.4.22 < 0.9.0;
import "./Ideator.sol";
import "./Investor.sol";
contract ContractOwner {
...
0
votes
1answer
17 views
Is it necessary to convert a file into a "Buffer or Readable stream" before adding it to IPFS?
I've uploaded some files using js-ipfs without converting it into Buffer or Readable stream, and it works just fine.
since IPFS converts the file into blocks anyway, why use buffer/stream!
what are ...
0
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1answer
59 views
How to call ERC 721 smart contract methods from JavaScript [duplicate]
I'm trying to create a simple nft minting website and I have my contract working properly but I'm having trouble implementing the actual minting process. So far my site only has the ability to let ...
0
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0answers
9 views
function call got a different result on remix and with web3js
i call the exact same function from the exact same contract on remix and got a different result that i had calling it with web3js. Actually remix give me the "good" result. All the others ...
0
votes
1answer
18 views
Accessing Solidity contract member objects from Javascript
I have the following contract defined:
pragma solidity >=0.7.0 < 0.9.0;
contract LoanApplication {
struct Applicant {
bytes32 ssn;
bool isTenant;
}
struct Loan ...
0
votes
0answers
25 views
Best approach to transfer a % of a token
i´m very new in blockchain and i'm trying to understand how to handler the amounts and values.
I want to transfer 10% of the total token BEP20 amount to an array of wallets. Is this a good way to do ...
0
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0answers
25 views
Displayinf error on payable in solc
This is my transaction file, to interact with the Eth blockchain, but it is showing me error in payable keyword in solc, can anyone help me with it, please
// SPDX-License-Identifier: UNLICENSED
...
0
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1answer
20 views
Differences between .deploy() and deployed() methods
I am writing a js script that deploy my solidity contract. In the tuto, they use two methods .deploy() and .deployed()
const main = async () => {
const [owner, randomPerson] = await hre.ethers....
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0answers
28 views
How to get return values from solidity into javascript code?
I have been trying to write different solidity functions inside my smart contract trying to return different types of values:
uint256 public _currentTokenId = 0;
function getCurrentTokenId() public ...
0
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0answers
6 views
How do you get the Erc20 token balance of a random address using hardhat without the ABI json? [duplicate]
I need the dai balance of a whale which I am impersonating with hardhat.
0
votes
1answer
14 views
How to find ERC721 compliant NFTs owned by an address?
Is there any way to get the current owner's address of an nft? I need to use it in my project in unity. I'm new to these things, I would be glad if you could help me.
0
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0answers
31 views
Provide button to claim token without showing my private keys
The player will claim their rewards (a token) and pay a fee through their wallet.
How does this process happen without my needing to display my private keys on the front-end?
What I know so far is ...
0
votes
1answer
158 views
Approve BUSD token in pancakeswap
im new in blockchain and i´m playing with the web3 javascript library. I´m trying to approve the BUSD token to do a swap. My js code is something like this:
async function approveToken(web3, c, ...
0
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0answers
87 views
How to properly subscribe to Uniswap v3 pool price events with NodeJS and JavaScript?
In reviewing the Uniswap v3 Quoter documentation:
These functions are not marked view because they rely on calling
non-view functions and reverting to compute the result. They are also
not gas ...
0
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0answers
27 views
Major differences between ethers-js and ethers-rs
I haven't used ethers-rs before, are there any extra features there compared to ethers-js.
Learning rust is not an issue here, I'm pretty comfortable with both javascript and rust.
0
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0answers
22 views
Rendering Returned Solidity Mapping Values in React Component
Here is a Solidity contract:
pragma solidity ^0.8.7;
contract SomeContract {
address public manager;
uint public theNumberNine;
mapping (string => mapping (address => uint)) public ...
1
vote
1answer
80 views
Why can't I access the Uniswap v3 Factory .getPool() function?
As a personal exercise, I am trying to convert the following Uniswap v2 project to Uniswap v3:
Uniswap token price monitoring (this is not swapping), i.e. ETH/DAI
https://www.youtube.com/watch?v=...
0
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0answers
32 views
How to transfer ERC20 Token using web3js
I am trying to send erc20 token using web3js version 1.6.1 but I am getting some strange error ,
I tried to copy the error from console and paste it in google but I could not find any results
this is ...
0
votes
0answers
22 views
Truffle's artifact is undefined when running truffle migrate
I'm trying to run truffle migrate on two js files: 1_initial_migration.js and 2_deploy_contracts.js. I can successfully compile my .sol files to .json ABIs but then when I try to migrate I get the ...
1
vote
1answer
24 views
Is it possible to set listeners on web3js contracts transfer method?
Im trying to transfer erc20 tokens in web3js
here is the code I am using
let minABI = [
// transfer
{
"constant": false,
"inputs": [
{
"name": ...
2
votes
1answer
34 views
Unit testing Solidity JS
I want to test these 3 different require in my mint function with Javascript.
function mint(uint256 _mintAmount) public payable {
require(_mintAmount > 0, "need to mint at least 1 NFT"...
1
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0answers
88 views
How do I generate a metamask mobile deep link programmatically?
I found this site. https://metamask.github.io/metamask-deeplinks/#
Which returns a url like:
https://metamask.app.link/dapp/tipme.cash
However if I change the domain name programmatically it doesn’t ...
1
vote
0answers
46 views
Read from a testnet Rinkeby contract with hardhat script
I am trying to read state variables (using hardhat scripts) from a contract deployed on the Rinkeby network.
I use the script below but it returns 'undefined' as if it can't read from the contract.
...
1
vote
0answers
23 views
decode string from smart contract
I have an event that fires from a function which receives a string as parameter, this string is a GUID.
However when I use web3.getpastevents it looks like my string(GUID) is encoded as hex, but when ...
0
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0answers
5 views
How to deploy a contract with dependencies to other contracts with javascript/web3js in one transaction?
I have a project with 6 contracts and the main one includes the other 5.
How do i deploy all of them keeping the dependency but in one single transaction, if possible?
I already have their respective ...
0
votes
1answer
16 views
Remix - cant compile for unknown reason
When I compile the program it says it's expecting a ; somewhere in line 8.
I've tried adding it in, getting rid of brackets in the line where it's telling me to, but with no avail.
Be great if you ...
0
votes
1answer
36 views
Web3js getTransactionCount() always return 1
web3js.eth.getTransactionCount(CONTRACT_ADDRESS+'').then( txcount => {
console.log( "-> getTransactionCount: " + txcount );
});
Always return 1, but my contract has lot of ...
0
votes
0answers
15 views
Trouble calling smart contract methods in javascript
I am new to HTML and JavaScript and especially solidity. I am receiving this error -
"Uncaught TypeError: VotingContract.returnVoterAddress is not a function". My js script is as follows:
if ...
