Contract watcher #

You can easily track an on-chain data by calling the watch or watchRef methods of any VEContract instance when this one is safe to be used.

watch() #

The dapp.contracts.<contractName>.watch(<method>, <args>, <callback>) method allows to watch for the data returned by a method of the contract, with the given args, and to execute a callback with the new data each time this one changes.

Here is a simple code that allows to track the balance of an ERC20 contract user :

import { dapp } from "tulipe";

let userBalance = $ref(null);

dapp.contracts.MyToken.watch("balanceOf", [dapp.signer.address], (newValue) => {
  userBalance = newValue;
})

watchRef() #

This method is still experimental and may be removed in the next versions of Tulipe, that's why at the moment, it is not documented.