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Update example of subscribing to a transaction in accordance with changes in web3.js #15507

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19 changes: 10 additions & 9 deletions docs/introduction-to-smart-contracts.rst
Original file line number Diff line number Diff line change
Expand Up @@ -186,16 +186,17 @@ and any user interface calls the automatically generated ``balances`` function f

.. code-block:: javascript

Coin.Sent().watch({}, '', function(error, result) {
if (!error) {
console.log("Coin transfer: " + result.args.amount +
" coins were sent from " + result.args.from +
" to " + result.args.to + ".");
console.log("Balances now:\n" +
"Sender: " + Coin.balances.call(result.args.from) +
"Receiver: " + Coin.balances.call(result.args.to));
}
Coin.events.Sent().on('data', async function (event) {
console.log("Coin transfer: " + event.returnValues.amount +
" coins were sent from " + event.returnValues.from +
" to " + event.returnValues.to + ".")
const senderBalance = await Coin.methods.balances(event.returnValues.from).call();
const receiverBalance = await Coin.methods.balances(event.returnValues.to).call();
console.log("Balances now:\n" +
"Sender: " + senderBalance +
"\nReceiver: " + receiverBalance);
})
Coin.events.Sent().on('error', console.error);

.. index:: coin

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