Questions tagged [javascript]

JavaScript is a dynamic, weakly-typed language used for client-side as well as server-side scripting.

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766 views

How to insert multiple transactions into One Block in Ganache GUI

Is it possible to enable Ganache GUI to put multiple transactions into ONE block ?. The details about Why i need this thing, is given below; I am going to test Transaction Order Dependence (TOD) ...
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1answer
46 views

AZTEC validateProof and validateProofByHash sender / signer addresses

The AZTEC Crypto Engine lets you validate proofs and cache them for future re-use, since they are fairly expensive (around 800,000 gas for a 4-note join-split proof before Istanbul, and now about 200,...
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1answer
31 views

How to pass encoded parameters to call contract getter fuctions

I have an array (i.e. functionNames[]) of getter functions's names of my contract and another array (i.e. finalGettersParams) of encoded parameters (which has been populated from web3.eth.abi....
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1answer
41 views

How to access the element of decodedParameters

I have used web3.eth.abi.decodeParameters and returned values have been pushed into my array (finalGettersParams.push(...)) something like this. [ Result { __length__: 0 }, Result { '0': '...
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1answer
68 views

How to print the value of encoded getter functions of contract

UPDATED: Sorry for Inconvenience, I have updated all my question and accept my apology , being naive user. I have encoded getter functions of my contract i.e. ...
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1answer
36 views

base fee exceeds gas limit , error when deploying using encoded constructor

I have following small simple contract pragma solidity 0.4.24; contract MyContract { uint256 public totalSupply ; mapping( address => uint256) public balances ; address public ...
2
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0answers
127 views

EIP-712 typed signature for arrays

I'm trying to generate a typed signature for an array in JavaScript based on EIP-712 and using eth-sig-util. My problem is that I need to sign an array. It says in the specification to use Type[] or ...
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1answer
420 views

how to create Function Selector (Method IDs)

As stated in ABI specs that 0xcdcd77c0: the Method ID. This is derived as the first 4 bytes of the Keccak hash of the ASCII form of the signature baz(uint32,bool). So, I have to create method IDs (...
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0answers
565 views

TypeError: CreateListFromArrayLike called on non-object

I have this contract and deployed it to my local client (ganache gui) and its abi.json file (of solc compiler generated). The third file is param.txt which contains encoded functions with arguments ...
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1answer
2k views

TypeError: _getWeb3__WEBPACK_IMPORTED_MODULE_0__.default.eth is undefined

I'm not familiar with webpack, but after reading this error all I know that I import one module that is undefined by webpack. However, I don't know why export default new web3.eth.Contract(abi, ...
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2answers
87 views

Recovering of typed signature fails because it's too long

I have a typed signature generated by EIP712 V3. It is 132 characters long. I'm trying to recover it using recoverTypedSignature from eth-sig-util. This fails saying: index.js:1 Error: Invalid ...
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1answer
465 views

Error: Uncaught [TypeError: Cannot read property 'ContractName' of undefined]

I am trying to get source of open source verified contracts and write into a file at my local folder. I could write only one file (of first address) but for the rest i am facing captioned error. ...
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1answer
339 views

Invalid Address format - Etherscan.io APIs problem

I have download list of verified open source contract addresses's list and loaded into addresses[]. Now I want to download sourcecode/ABIs etc... of that contracts. Although, i have called setTimeOut ...
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1answer
474 views

Could not find declaration module for file 'solc'

I was trying with a simple contract,when I do "node compile.js" in my windows cmd it throws an error.I was using vscode it showing error in const solc = require('solc'),I installed everything ...
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0answers
427 views

Error: Cross origin null forbidden : ---Problem in downloading Open source contracts from Etherscan.io

UPDATED: I am trying to download source code of open source verified contract from Etherscan.io. Here is my procedure as directed by Ann. 1. Download CSV file of captioned contracts. 2. Write ...
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0answers
38 views

How to check current status of state variables

I have deployed my contract locally into Ganache (GUI) and then send/call lot of transactions. After these transactions, now I want to check the current status of all state variables. Is there any way/...
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1answer
501 views

How to download contracts by address from Etherscan using web3.js

I want to download all contracts (open source code) from etherscan.io using Web3js. Etherscan gives only the list of such verified open source contract with txHash, name, and their addresses. Is there ...
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1answer
32 views

Storing code in contracts

I'm considering different designs to implement "configuration options" with Ethereum. The design should allow me to define arbitrary (= number and type) options, quick access to a list of options, ...
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2answers
135 views

Could not deploy contract with valid data

I have downloaded contracts with their abi and json. I have to deploy them. when i extract bytecode from downloaded files and then assign it to my data variable to deploy contract whic gives following ...
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1answer
66 views

How can fix in smart contract written in solidity?

TypeError: Invalid type for argument in function call. Invalid implicit conversion from address to address payable requested. selfdestruct(admin); pragma solidity >=0.4.21 <0.6.0; ...
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1answer
72 views

Could not deploy contract through sendTransaction

I am trying to deploy contract (available at Etherscan.io ). I proceed following steps: copy its contract creation code and save them in crCode variable. Then i tried to to run following code; async ...
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0answers
32 views

Dataset of simple contracts with getter setters

Are there any repositories/datasets which provide smart contract with simple logic like having some getters and setter functions. So, that I could give some values to getter and setter functions, ...
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1answer
1k views

Ganache VM Exception while processing transaction: out of gas

I am deploying my contract using web3 by taking values (just copy paste) from Etherscan (i.e. abi, contract creation code, etc.) and then deploy my contract on Ganache (gui). When i run the my code ...
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1answer
336 views

UnhandledPromiseRejectionWarning: Error: invalid address (arg=“”, coderType=“address”

First of all, i extracting function from abi of my contract and calling them automatically. As per documentation of solidity, when we compile .sol, some functions are automatically generated as per ...
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1answer
281 views

Ganache is not updating my contract status

I am using ganche for local ethereum. I have successfully deployed my contract through web3js on ganache. (The same contract also tested on Remix, all function properly running as per logic). Now i ...
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0answers
47 views

creating transaction with dynamic arguments (objects/variables)

My scenario is to make transactions (deploy contract, calling its functions, etc.) with arguments (which are dynamically created/extracted from some json abi file). For example; function ...
2
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1answer
98 views

Automatically extracting functions names and parameters from ABI JSON file

I have done some work on captioned subject. For example, I can extract all getter functions (and some constructors as well) of all given smart contracts (in abi json file format). Then i can call (...
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1answer
117 views

Could not call contract function with its signature

Web3.js documentation says here that the methods of a smart contract are available through: The name: myContract.methods.myMethod The name with parameters: myContract.methods['myMethod(uint256)'] The ...
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1answer
232 views

Calling contract functions using only ABI without source code

I have MyContract.json file of some contract(assume i haven't its source code). In .json file, there is abi and bytecode. If i want to deploy such contract (through web3js), I am facing following ...
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1answer
27 views

Different behavior of the same contract between JavaScript and Solidity tests with Truffle

I have a simple contract that functions as a ratekeeper - it is constructed with a capacity and time_frame (in blocks) parameters and makes sure we never add more than $capacity payments in any given ...
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1answer
197 views

eth_getBlockByNumber returning undefined

I have some JavaScript that's connecting to a private ethereum network via JSON-RPC. I am trying to extract the transaction hash of the blocks but am unable to do so. // BlockNumber clientNodeOne....
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1answer
33 views

Could not call contract function

I want to access the balance of contract(i.e. 0x552F3AfaA0394632f4aEfa9E923fA3e2bbDAF5FE) and its totalSupply(state variable). I could access the balancec of this contract , but why I could not call ...
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1answer
66 views

How to deploy and get address of smart contract in same javascript program

I want to deploy a smart contract (provided in .json file) and need its address (on testnet blockchain) and then try to send some transactions to it. All these should be done through javascript. Here ...
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2answers
372 views

Ethers.js: Call constant method with await does not work [closed]

If I try to get the result of a constant function call with: let gameCountAwait = await contract.getGameEntry(0); it fails with: Uncaught SyntaxError: await is only valid in async function ...
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1answer
80 views

How to call external payable contract function from app.js (DApp)?

The contract has a function: function purchaseTokens() external payable { require(msg.value>0); ...etceteras... } What I need is an app.js part, something that would look like this (lets ...
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1answer
163 views

How to know the execution time of transaction when miner execute it

When i send three consecutive transactions to my contract (deployed on ethereum testnet), how can i know the exact time (at milli/micro/nano level) which transaction executed (on miner side) first and ...
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1answer
44 views

State Variable of solidity Contract could not be updated through JavaScript

I have following contract and just want to update its state variable values i.e. totalSupply. But when I try to attempt this task through JavaScript code (given below) by calling its function i.e. ...
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3answers
47 views

Could not assign contract state variable value to javascript variable

I want to retrieve and assign the value of my contract state variable to my javascript variable.I am doing as per guidlines provided on this community, but failed to assigned. my javascript code is ...
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1answer
143 views

Erc20 address generation

Can someone tell me how it is possible to implement the generation of unique erc20 addresses for registered users?
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1answer
87 views

How to build security into Dapps?

I am building a loan dapp. The functionality is not easy to build but relatively straightforward. My question is though does anyone have any suggestions of how to build in user logins and security? ...
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2answers
682 views

Truffle - Get ETH Balance with Web3JS - two different errors

Using "web3": "1.0.0-beta.46" because doing a tutorial, and they recommended using all his versions to make sure everything works together. Using Gnache and Truffle unit tests, I have tried two ...
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1answer
57 views

Truffle returning balances from a function

This maybe just a simple Javascript issue, but it's in the context of running under Truffle. I can't seem to access my object variables coming back from my function; thus the tests are failing with ...
0
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1answer
183 views

How can a smart contract payable based function returns value against any purchase

I am trying to get a return value from the payable function, the idea is a user must pay the fees and in return, he will get his special code. My JS test code is as follow it('get special code ...
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0answers
42 views

Recursive binary search function (in solidity) not working

This is recursive binary search function in solidity. I run the SortTESTER function to populate an array with values. Then I run the SortUserData function to check values which passes the values to ...
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1answer
82 views

web3js later versions. Bundle, how?

I'm trying to build the frontend of a dApp, but the web3js makes my head hurt. I need to include it in my project, but the latest web3.min.js i can find is this. I want to use 1.2.1, and i understand ...
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1answer
97 views

Unable to Verify Smart Contract

Currently I want to make a smart contract for verifying documents. However, I couldn't make it works. I have followed the tutorials as shown here (it is for Solidity 0.4.4 and mine is solidity 0.5.0) ...
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1answer
61 views

Emited Solidity Events not being watched at frontend truffle contract instance

So, I have been reading through A LOT of pages about events in Solidity and how to interact with them on frontend but I am still pretty new to this and it seems like there have been multiple changes, ...
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1answer
21 views

Geth and JavaScript

I want to deploy a private blockchain using Geth. I am considering using JavaScript to build the backend as I did before (NodeJS) but what about the smart contract? Since it is private is there a way ...
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1answer
26 views

BrowserSolc not defined

I'm trying to use BrowserSolc in my dApp, but it's just not loading, it seems. I've got browser-solc.min.js in the same folder as index.html, with the following near the top of the page: <script ...
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2answers
87 views

I Call SmartContract Token ERC20, Why Show Hashing Output ? (Web3 + Metamask + Javascript)

I do not know why with this, even though in the previous version (web3 + Metamask) can issue real data. But now used as hashing (output). I took the example in the code and output below (to get the ...

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