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Upgrading to Ethereum Web3 v4.7.0: Capturing Emitted Events with Ease

As a developer building complex applications on top of the Ethereum blockchain, one of the most challenging tasks we face is handling events emitted by the network. In our case, we’ve upgraded from version 1.x.x (the deprecated version) to version 4.7.0 (our new favorite), and now we’re eager to learn how to handle these emitted events with ease.

The first step in leveraging Ethereum Web3 v4.7.0 is to understand the event emission process. In general, when an event is emitted by a contract or a call to its function, it triggers a callback that gets broadcast to all connected nodes on the network. This allows other applications and contracts to react to the event.

To capture these events with our web3.js library (v4.7.0), we can use the on method provided by Web3.js. Here’s an example of how you might do it:

// Import the necessary modules

const Web3 = require('web3');

const web3 = new Web3();


// Get the Ethereum provider instance

const provider = new web3.providers.HttpProvider('


// Define a function to handle emitted events

function onEvent(event) {

  // Check if this event is of interest (e.g., "NewBlock")

  if (event.type === 'NewBlock') {

    console.log(Received new block: ${event.data});

  }

}


// Subscribe to emitted events

web3.eth.on('block', onEvent);


// You can also specify a specific event type and callback function

web3.eth.on('TransactionHash', onEvent);

In this example, we import the Web3.js library and create an instance of the Ethereum provider. We then define a on method that listens for emitted events of interest (in our case, “NewBlock”). The callback function onEvent is called whenever it receives an event broadcast to the network.

When you’re ready to disconnect from the network, simply call the off method on your instance:

web3.eth.off('block', onEvent);

By following this example and using Web3.js v4.7.0, we can easily capture emitted events in our applications and respond accordingly.

Tips and Variations

• Make sure to replace ' with your actual Infura project ID.

• You can also specify a callback function or event handler as an argument to theonmethod, like this:web3.eth.on(‘NewBlock’, onEvent)`.

• Keep in mind that events are only emitted when a contract is called. For example, if you’re calling a contract function from another contract, it won’t emit an event.

• If you need more control over the event handling process (e.g., for complex use cases), consider using Web3.js v5.x.x.

We hope this helps! Let us know in the comments if you have any questions or need further assistance.

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