react-web3-components
A set components to create DApp interfaces using react.
The core component is Web3Provider
which exposes a web3
instance along with account state to nested components in this library using a specific react context (Web3Context
). Other components can be nested anywhere in the virtual dom.
Available components:
Sign
: sign a message with the selected account.Accounts
: the list of available accounts.SelectedAccount
: the currently selected account.NewAccount
: create a new account.Unlock
: unlock the selected account.
Use with Metamask
By default, the Web3Provider
will use a web3
instance using the browser's givenProvider
(which is in most cases Metamask).
<Web3Provider> <Sign message='hello'/></Web3Provider>
web3
Use a custom instance of It is possible to specify a custom instance of web3
to use, for example, with a WebSocket provider to connect to a local geth
node.
let wsWeb3 = 'ws://localhost:8546'; const app = <Web3Provider => ... </Web3Provider>
Customize rendering
In general, component render can be customized using functions as child components. See below for properties available for each component.
Example – Login users using Metamask's signature:
<Web3Provider> <Sign message='Login nonce: 1234' onSign=consolelog onError=consoleerror > message disabled selectedAccount signAction <div> <button disabled=disabled onClick=signAction> Login with <code>disabled ? '': `…`</code> </button> </div> </Sign></Web3Provider>
API
Web3Provider
, Web3Context
Handles update events and Metamask account access requests. Initializes and manages the context provided to other components.
Params:
web3
: Specifies the web3 instance to use (defaultnew Web3(Web3.givenProvider)
).onUpdate
: A callback triggered each time accounts state changes.logger
: Possibly a custom logger handler.
Exposes a Web3Context
provider which gives access to an object containing:
web3
: The instance of web3 used by this provider.selectedAccount
: The selected account.accounts
: An array of all available accounts.updateAccounts
: A function to force update of the accounts state. This function receives a single optional parameter to specify the account that should be selected. Ifnull
the selected account will use the first available account.
Sign
Sign a message with the selected account.
Params:
-
message
: The message to be signed, this can be either astring
or aBuffer
(default''
). -
password
: The password (if needed). This is needed for accounts protected with password as ingeth
accounts when using a WebSocket provider. Metamask doesn't need a password. -
onSign
: A callback for accessing the resulting signature (default() => {}
). The signature result is an object of the form:{ signature, // The hex formatted signature as returned by web3 signedBy, // The account that signed the message message, // The original message hexMessage, // The hex formatted message }
-
onError
: A callback for handling errors if any (default() => {}
). This function receives a single parameter, the error message.
Child function:
The child function for custom rendering receives an object containing:
message
: The message to be signed.disabled
:true
if no account selected,false
otherwise.selectedAccount
: The account that will sign the message.signAction
: The action that, when triggered, will request the signature.
SelectedAccount
Shows the currently selected account.
Params:
- none
Child function:
The child function for custom rendering receives an object containing:
selectedAccount
: The selected address.
Accounts
Shows the list of available accounts and allows to select an account when many available (such as when connecting to a geth
instance with a WebSocket web3 provider).
Params:
- none
Child function:
The child function for custom rendering receives an object containing:
selectedAccount
: The selected address.accounts
: An array of all available accounts.updateAccounts
: A function to set the selected account and update the list of available accounts.
NewAccount
Creates a new account and if succeeds, sets it as the selected account (Doesn't work with Metamask).
Params:
password
: The password for the newly created account (default''
)onCreate
: A callback for accessing the newly created account (default() => {}
). This function receives a single parameter, the new address.onError
: A callback for handling errors if any (default() => {}
). This function receives a single parameter, the error message.
Child function:
The child function for custom rendering receives an object containing:
newAccountAction
: The action that, when triggered, will create a new account.
Unlock
Unlock the selected account (Doesn't work with Metamask).
Params:
password
: The password for unlocking the account (default''
).duration
: The duration for unlocking the account (default0
).onUnlock
: A callback called when the account was unlocked (default() => {}
). This function receives a single parameter,true
if the account was unlocked.onError
: A callback for handling errors if any (default() => {}
). This function receives a single parameter, the error message.
Child function:
The child function for custom rendering receives an object containing:
selectedAccount
: The selected address.duration
: The duration for unlocking the account.unlockAction
: The action that, when triggered, will request the account unlocking.disabled
:true
if no account selected,false
otherwise.