Writing to a smart contract

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Learn about ABIs first: https://www.quicknode.com/guides/solidity/what-is-an-abi

We make use of the useContractWrite hook from wagmi to read from a smart contract.

import { useContractWrite } from 'wagmi'

const Page = () => {
  const { data, error, loading, write } = useContractWrite(
    {
      addressOrName: 'your_contracts_address',
      abi: your_contracts_abi,
    },
    'the_contract_method_name'
  )
}

For example, if you want to set the greeting i.e. call setGreeting for a Greeter contract:

import { useContractWrite } from 'wagmi'

const Page = () => {
  const { data, error, loading, write } = useContractWrite(
    {
      addressOrName: 'greeter_address',
      abi: Greeter_ABI,
    },
    'setGreeting'
  )

  return (
    <>
      <button onClick={() => write('Hello, world!')}>Set greeting</button>
    </>
  )
}

Last updated on June 1, 2022