November 2019
Beginner
436 pages
8h 52m
English
Content preview from Electron Projects
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Testing real-time updates
When we defined the groups property earlier in this chapter, we used the valueChanges API to get an Observable instance. This Observable helps us build a list that reacts to changes. Each time the underlying data changes, the Material List component is going to redraw everything.
Let's see if that behavior works with our chat application:
- Run the application and ensure that you are facing the group list.
- Switch to the Firebase console and navigate to the Database section.
For better visibility, I recommend having both tabs open side by side so that you see the changes we make on both pages simultaneously.
- Add a new group entry to the list of groups, as shown in the following screenshot:
- When you are ready, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.