Questions tagged [react]
React (also known as React.js or ReactJS) is a JavaScript library for building user interfaces. It uses a declarative paradigm and aims to be both efficient and flexible.
16
questions
1
vote
2answers
2k views
Error in unboxing truffle-react on Windows
I am trying to unbox truffle-react but I am stuck with this error:
$ truffle unbox react
Downloading...
Unpacking...
Setting up...
Error: Command failed: npm install
npm WARN deprecated ethereumjs-...
7
votes
2answers
1k views
Why does sendSignedTransaction return a tx hash BUT does not post to the Rinkeby network (React, Metamask, web3, infura)
I'm developing a very simple React application wherein a user clicks a button and some ether gets sent from one account to another. Currently, the onClick sendEther function crafts a proper signed ...
5
votes
1answer
3k views
Watching Solidity event gives error: TypeError: watch is not a function
I am trying to watch a Solidity event in my React app, but I keep getting the following exception error thrown:
TypeError: MyEvent.watch is not a function
I am sure the event is present in ...
2
votes
4answers
3k views
Module not found: Can't resolve './contracts/SimpleStorage.json'
I am new to solidity, truffle and i tried react-box from Truffle and i get the following error. I am using Macos.
Here is the basic steps
npm install -g truffle
truffle develop
compile
...
0
votes
1answer
411 views
Comparison of Metamask vs Ganache [closed]
I watched some videos about Metamask but I am so confused by it
Metamask: To use the final application like the end user would.
Based on that, what is the purpose of React then?
What are the ...
1
vote
1answer
3k views
How to map a web3 to a react.js state
How would you map a changing variable from web3 to react.js component?
Example:
class App extends Component {
constructor(props){
super(props);
this.state = {
blockNumber: web3.eth....
2
votes
1answer
614 views
Solidity Truffle React TestRPC: Invalid address error while creating transactions through React app
I am writing a simple contract which is basically a registry. I am using testRPC for my ethereum testing.
Following is my contract on Truffle:
notary.sol
pragma solidity ^0.4.11;
contract notary {
...
5
votes
1answer
3k views
The send transactions “from” field must be defined!
I am trying to call a function of a contract that has been deployed to Ganache. I am trying to call a function that makes payouts to a few addresses and can be called by owner only. When I am calling ...
3
votes
2answers
805 views
simple dapp with React “issues with solidity”
i am trying to build a simple app (will improve once i get the simple one to work)I created a new Reactapp, added both the contracts and migrations directories and i use ganache and metamaks.
I have ...
2
votes
2answers
3k views
Metamask transaction confirmed but “Internal JSON RPC error”
I am using getWeb3() to instantiate a contract and make calls with, the transaction says that is confirmed but when I open up developer tools there is the following error MetaMask - RPC Error: ...
2
votes
1answer
1k views
Web3 not defined
I am following this tutorial here:
https://medium.com/@merunasgrincalaitis/the-ultimate-end-to-end-tutorial-to-create-and-deploy-a-fully-descentralized-dapp-in-ethereum-18f0cf6d7e0e
after running ...
1
vote
0answers
372 views
metamask and infura - Managing and signing with private keys
I am using Infura as a node for my DApp so I need to send raw transactions by signing them. These transactions can come from multiple users of an application so each user must sign and send a raw ...
1
vote
1answer
564 views
Truffle Drizzle ContractData call keccak256 error
I started with truffle unbox drizzle
then made use of my contract.
I can make use of the ContactForm without error in App.js:
<ContractForm
contract="TheContract"
method="addData"
labels={["...
1
vote
1answer
671 views
Undefined in truffle-contract initialization
why I always have undefined from
contract(_contract).setProvider(this.web3Provided);
Component:
import React, {Component, PropTypes} from 'react';
import { default as Web3 } from 'web3';
import { ...
0
votes
2answers
162 views
initialise array of struct inside a new struct
Following up on the question of 2d array of different types: 2d array of different types?
How would one go about initializing a new array of structs (Vote) when creating a new struct (Project)
...
0
votes
2answers
785 views
truffle/web3 event listeners returns nothing
We have an event being triggered in a contract and our listeners on the client cant receive the return value.
https://gist.github.com/stupeters187/9529b54fe0d48ee606ad06ced6b16031
Update: metamask ...
