web3-send-transaction.js

try {
  const account = getAccount();
  const hash = await yourContractInstance.yourMethod.sendTransaction(arg1, arg2, {
      from: account,
      // if payable, specify value
      // value: web3js.toWei(value, 'ether')
    });
  // update progress UI
  setSubmitting(false);
  // reset transaction related form, if any
  resetForm();
}
catch(e)
{
  // if user cancel transaction at Metamask UI we'll get error and handle it here
  console.log(e);
  // update progress UI anyway
  setSubmitting(false);
}