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Canceling a User Prompt with Metamask in Your App
As an app developer, you’re aware of the importance of providing a seamless user experience. One often overlooked aspect is handling user prompts, especially those triggered by external wallets like MetaMask. In this article, we’ll explore how to cancel a user prompt based on user action within your application.
The Problem: Canceling User Prompts
When triggering a transaction from within your app, you’re likely using the MetaMask API to interact with the wallet. However, when the user accepts or rejects the prompt, the API may still trigger additional interactions or prompts. This can lead to unnecessary delays, increased error rates, and frustration for the user.
Solution: Canceling User Prompts
To cancel a user prompt based on user action from within your app, you’ll need to implement a robust event handling system that tracks user interactions. Here’s a step-by-step guide:
1. Set up Event Action
In your application code, set up an event listener for the onConfirm and onReject events triggered by MetaMask. These events will contain information about the user’s decision:
const wallet = new Web3 Wallet();
wallet.on('connection', (connection) => {
connection.on('confirmed',() => {
console.log('User confirmed transaction:', connection.transaction);
});
connection.on('rejected',() => {
console.log('User rejected transaction:', connection.transaction);
});
});
2. Track User Action
Use a unique identifier or token to associate each user with their corresponding wallet instance. This will allow you to track user actions and cancel prompts accordingly:
const userId = '1234567890';
wallet.get('user_id', (err, user) => {
if ( err || ! user ) return ;
console.log('User ID:', userId);
const transactionId = connection.transaction.id;
wallet.update(userId, transactionId,(err,result) => {
if ( err || ! result ) return ;
// Cancel prompt based on user action
if ( result . canceled ) {
console.log('Prompt canceled by user:', userId);
} else {
console.log('User has rejected the transaction.');
} }
});
});
3. Handle Cancel Event
When a cancel event is triggered, update your database or cache with the corresponding wallet instance ID:
wallet.on('cancel', () => {
const userId = '1234567890';
console.log('Cancel prompt canceled by user:', userId);
// Update the database or cache with canceled transaction ID
});
4. Handle Reject Event
When a reject event is triggered, update your database or cache with the corresponding wallet instance ID:
wallet.on('reject',() => {
const userId = '1234567890';
console.log('User rejected transaction:', userId);
// Update database or cache with rejected transaction ID
});
By following these steps and leveraging event handling, you can effectively cancel user prompts based on user action within your app using MetaMask.
Example Use Case:
Suppose you’re building a decentralized application (dApp) that enables users to create and manage their own wallets. When a user initiates a transaction, you trigger the onConnection event:
const wallet = new Web3 Wallet();
wallet.on('connection', (connection) => {
connection.on('confirmed',() => {
console.log('User confirmed transaction:', connection.transaction);
});
connection.on('rejected',() => {
console.log('User rejected transaction:', connection.transaction);
});
});
When a user accepts the prompt, you update their wallet instance ID and cancel the previous transaction:
“`javascript
const userId = ‘1234567890’;
wallet . update ( userId , connection . transaction . id , ( error , result ) => {
if ( err || !