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Results tagged with web3js
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user 4181
Javascript API and library for Ethereum To develop applications on Ethereum, you can use the web3 object provided by the web3.js library. Under the hood it communicates to a local node through RPC calls. web3.js works with any Ethereum node, which exposes an RPC layer. https://github.com/ethereum/wiki/wiki/JavaScript-API
0
votes
Accepted
Cannot connect localhost to ropsten testnet via infura
You need to install Web3, and add the
var Web3 = require('web3');
- 3,408
0
votes
Automatically determine the use of call or sendTransaction based on the method type
As a workaround, you can automate the generating of the syntax in general by parsing the ABI, it holds all information about the function (name, modifier, inputs and outputs) necessary to generate the …
- 3,408
3
votes
How to access all accounts across multiple nodes? JS/Web3.js/API
At the moment, there is no way you can access your account on another computer without adding your key files there. that's not immediately a risk, as they're still password protected, but.. you get i …
- 3,408
2
votes
web3.js getBlock() call pauses after 500th iteration on MacOs
the problem is that you are not doing it asynchronously. Firing the 500 calls the sync way lead to an overload. You need to
Do all calls async
promisifiedGetBlock = function (theBlock) {
return ne …
- 3,408
0
votes
Sending a transaction to the smart contract and execute its method
When using the Mist Browser or MetaMask, you do not necccessarily have to unlock the account. They just take the transaction data, and sign a transaction for you.
- 3,408
0
votes
Event listener for changes to accounts list
Event listeners use to listen - as the name tells - to events in smart contracts. Nevertheless you can create a NodeJS Application, that uses a setInterval() function to call these values, compare the …
- 3,408
0
votes
Solidity | Smart Contract (Ethereum) transaction tracker API
If your contract grants the right to someone to call a function, there is no way for you to stop him from doing this (when the transaction is already sent). Of course you can implement safety measures …
- 3,408
0
votes
Debugging solidity function
You will have to provide _name as a parameter in NumberOfKeysInPossession() . I suppose you intended to use _name from transferKey()(just an assumption without any knowledge of the rest of your smart …
- 3,408
2
votes
How to get transaction failed reason with transaction hash with web3?
The answer is
status: false
This indicates what you see on etherscan. If you try getting this field through web3, the response is usually 0x0 or 0x1.
So here you go:
web3.eth.getTransactionRecei …
- 3,408
13
votes
Accepted
MetaMask injected Web3 not working in HTML file
MetaMask is injected into every loaded page by default. How did you serve your dApp ? Quote from https://github.com/MetaMask/faq/blob/master/DEVELOPERS.md :
Due to browser security restrictions, w …
- 3,408
0
votes
I deployed my contract using Remix solidity compiler and Metamask but i don't know how to de...
for this you should chek out the following development framework, called Truffle. They have a great documentation and lots of tutorials. https://github.com/trufflesuite/truffle Have fun.
PS: You wil …
- 3,408
0
votes
passing defaultBlock "pending" param to a truffle-contract call
There were issues with this before, please downgrade to truffle 3.x , delete the build/contracts/ folder (back it up just in case), rebuild the artifacts with truffle migrate --compile-all and try aga …
- 3,408
0
votes
Accepted
how to call constructor with arguments in REMIX (Solidity IDE ) from web3
the constructor function is called during the deployment of the contract. This can be done
in Remix: By providing the corresponding values to the arguments of your constructor function in the text …
- 3,408
0
votes
use web3js and infura deploy contract
Besides the comment, correctly stating the missing infura key, this cannot work, as you do not have a code component actually signing the transaction. The referenced web3 api here relies on node clien …
- 3,408
0
votes
how get to nonce that need to send in ethereum transaction?
Although miners can generally sort your transactions by nonces in their mempool and include them in the right order, this practically does not happen. So it is strongly recommended to verify that your …
- 3,408