0

I use this code to connect ui with smart contract

  window.addEventListener('load', () => {
     // Wait for loading completion to avoid race conditions with web3 injection timing.
      if (window.ethereum) {
        const web3 = new Web3(window.ethereum);
        try {
          // Request account access if needed
          await window.ethereum.enable();
          currentAddress = web3js.eth.accounts[0]
          // Acccounts now exposed
          return web3;
        } catch (error) {
          console.error(error);
        }
      }
      // Legacy dapp browsers...
      else if (window.web3) {
        // Use Mist/MetaMask's provider.
        const web3 = window.web3;
        console.log('Injected web3 detected.');
        return web3;
      }
      // Fallback to localhost; use dev console port by default...
      else {
        const provider = new Web3.providers.HttpProvider('https://ropsten.infura.io/v3/abikeygoeshere');
        const web3 = new Web3(provider);
        console.log('No web3 instance injected, using Local web3.');
        return web3;
      }
    });

but in my console i get this error

exchange.js:41 Uncaught SyntaxError: await is only valid in async function

this is in line 41 

await window.ethereum.enable();

how can i fix this?

Improve this question

1 Answer 1

Reset to default
0

Change line:

window.addEventListener('load', () => {

To:

window.addEventListener('load', async () => {
Improve this answer
5
  • now i get even more errors
    – yappy twan
    Commented Jan 17, 2020 at 9:03
  • List them here so we can inspect. Errors are something daily in this job, so get used to them :)
    – Miroslav Nedelchev
    Commented Jan 17, 2020 at 9:08
  • these are the errors im getting now Uncaught Error: Invalid JSON RPC response: undefined at Object.InvalidResponse (inpage.js:1) at a.send (inpage.js:1) at w.e [as getBalance] (inpage.js:1) at exchange.js:43 InvalidResponse @ inpage.js:1 a.send @ inpage.js:1 e @ inpage.js:1 (anonymous) @ exchange.js:43
    – yappy twan
    Commented Jan 17, 2020 at 9:09
  • Start with debugging your provider and web3. Are you sure you initiated your infura application correctly? DId you place your infura api key correctly at this row: const provider = new Web3.providers.HttpProvider('ropsten.infura.io/v3/abikeygoeshere');
    – Miroslav Nedelchev
    Commented Jan 17, 2020 at 9:18
  • the error came from those 2 lines: let contract = web3.eth.getBalance('0xE462CbEE0cd420f6c199B0194B1D8D93Fb5e7720'); //document.getElementById('agiContractBalance').value =contract; console.log(contract);
    – yappy twan
    Commented Jan 17, 2020 at 9:26

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.