This project was bootstrapped with [Create React App] and truffle init and is configured to work with a local blockchain like Ganache.
You can make requests with simple window.ethereum object made available by metamask but you should consider using the Web3.js library as it makes available many other important functionalities.
- You get a provider in the windows context, injected by the metamask i.e
windows.ethereum
- Then you create a new instance of Web3 to which you pass your provider as the argument
new Web3(provider)
while working with a private blockchain like ganache our provider can be obtained asnew Web3.providers.HttpProvider("http://localhost:7545")
-
To get the currenctly connected account from the metamask wallet we need to use
web3Api.web3.eth.getAccounts()
in a hook like this: Our hook will look like thisuseEffect(() => { const getAccount = async () => { const accounts = await web3Api.web3.eth.getAccounts() setAccount(accounts[0]) } web3Api.web3 && getAccount() }, [web3Api.web3]);
-
Our hook will supply the currently connected account to the state
account
we use theuseState
hook like thisconst [account, setAccount] = useState(null);
In the project directory, you can run:
Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.
The page will reload if you make edits.
You will also see any lint errors in the console.
Launches the test runner in the interactive watch mode.
See the section about running tests for more information.
Builds the app for production to the build
folder.
It correctly bundles React in production mode and optimizes the build for the best performance.
The build is minified and the filenames include the hashes.
Your app is ready to be deployed!
See the section about deployment for more information.
Note: this is a one-way operation. Once you eject
, you can’t go back!
If you aren’t satisfied with the build tool and configuration choices, you can eject
at any time. This command will remove the single build dependency from your project.
Instead, it will copy all the configuration files and the transitive dependencies (webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except eject
will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
You don’t have to ever use eject
. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
You can learn more in the Create React App documentation.
To learn React, check out the React documentation.
This section has moved here: https://facebook.github.io/create-react-app/docs/code-splitting
This section has moved here: https://facebook.github.io/create-react-app/docs/analyzing-the-bundle-size
This section has moved here: https://facebook.github.io/create-react-app/docs/making-a-progressive-web-app
This section has moved here: https://facebook.github.io/create-react-app/docs/advanced-configuration
This section has moved here: https://facebook.github.io/create-react-app/docs/deployment
This section has moved here: https://facebook.github.io/create-react-app/docs/troubleshooting#npm-run-build-fails-to-minify