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In this blog post, we’ll show you how to get a list of online users in a chatroom, and update that list in real time if a user joins or leaves the chatroom.
We’ve now covered both building a multiplayer game lobby with a chatroom and the different ways we can use matchmaking to connect two different users. Here’s what we’ve covered so far:
You’ll first need to sign up for a PubNub account. Once you sign up, you can get your unique PubNub keys in the PubNub Developer Portal. Once you have, clone the GitHub repository, and enter your unique PubNub keys on the PubNub initialization, for example:
We’re going to start with the code from the last example. The first thing we’ll do is divide the HTML up into columns from Bootstrap’s grid system.
First, we wrap all of the previous code in
.container-fluid to start the grid system.
We add two
.col-md-6 divs into a
.row. Because every
.row contains 12 columns, each
.col-md-6 will take up half the horizontal space forming two even colums.
You can read more about the Bootstrap grid system on the Bootstrap docs.
In the first
.col-md-6 we’ll create a placeholder for our list of online users. We’ll use Bootstrap’s
.list-group list styling and give it an id of
We’ll copy the last chapter’s example into the second
Now that we have a placeholder user list, let’s fill it up with online users. PubNub Presence enables you to monitor and publish who is online in the chatroom and who is offline, and update the list when they join or leave.
The library will fire an event whenever a user joins or leaves a channel. We just need to define a “presence” parameter and a callback function to fire when something happens.
The event information in
data will contain the following fields:
Here are some example events:
uuid field is a unique identifier assigned to every client that connects to PubNub. It is random by default, but you can supply your own as a setting when calling
We’ll simply plug in the
me variable from the last chapter and Presence will now show us our own usernames rather than the default random string.
And we get:
From here all we need to do is create a new
div for a user when they join. We also need to make sure we properly clean up and remove it when they leave or timeout.
Put it all together and we have a list of users online in the chatroom next to the chatroom output from the last chapter. Check out the demo below, or take a look at the CodePen for getting users in a chatroom here.
See the Pen Memewarz – Who’s Online by Ian Jennings (@ianjennings) on CodePen.5248
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