WebSockets

with Socket.io

by Alex LaFroscia

What are WebSockets?

How Does the Internet Work?

  • Your computer asks a server for some data
  • The server sends the data back to your computer
  • This works great for most things, but what about trying to get data in real time?

Enter WebSockets

  • Creates a two-directional connection between your computer and the server
  • Both can react to events taking place on the other

Socket.io

Why Socket.io

  • A standard way to implement the server end of a WebSocket connection
  • Libraries exist for many different types of clients
  • Extremely easy to use
emit
  • The event taking place
  • Sends some data to the other side
  • Can be done from client or server
on
  • Respond to an event taking place
  • Receive data from the other side
  • Can be done from client or server
// Client

// Takes the name of the event and
// the data to be sent as parameters

socket.emit('message', {
    sender: 'Alex LaFroscia',
    body:   'This is the message'
});
// Server

// Takes the name of the event and a
// callback as parameters

socket.on('message', function(data) {
  console.log("Sender: " + data.name);
  console.log("Message: " + data.body);
  // The message from the client gets
  // printed to the server
});

Demo Time

Creating a live chatroom in less than 6 minutes

(maybe)

The Plan

  • Show a list of chat messages on a page
  • Have an input box and send button that allow us to add messages

Intro to WebSockets through Socket.io

By Alex LaFroscia

Intro to WebSockets through Socket.io

Introduction to WebSockets through the Socket.io library

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