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Getting Started with Meteor.js JavaScript Framework - Second Edition
Getting Started with Meteor.js JavaScript Framework - Second Edition

Getting Started with Meteor.js JavaScript Framework - Second Edition: Learn to develop powerful web applications in minutes with Meteor

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Profile Icon Isaac Strack
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Can$26.98 Can$29.99
eBook Jun 2015 138 pages 1st Edition
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Can$26.98 Can$29.99
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Profile Icon Isaac Strack
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Can$26.98 Can$29.99
eBook Jun 2015 138 pages 1st Edition
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Getting Started with Meteor.js JavaScript Framework - Second Edition

Chapter 2. Reactive Programming…It's Alive!

As we learned in Chapter 1, Setup and Installation, Meteor operates on a reactive programming model. This means that your templates aren't only concerned with displaying data, but they are also listening for changes to that data so that they can "react" to those changes. These areas of data where the templates look for changes are called reactive contexts.

We will now start developing a Lending Library application, lay the framework for future chapters, and use Meteor's built-in reactive model to track and propagate changes to our application to all clients that are listening.

In this chapter, you will learn about:

  • Creating your first real application
  • Using reactive programming to track and automatically update changes
  • Exploring and testing changes made to your data from multiple browser windows

Creating the Lending Library

There are two kinds of people in this world—those who remember who they lent something to and those who buy a lot of stuff twice. If you're one of the people who is on a first-name basis with your UPS delivery driver, this application is for you!

Using Meteor, we're going to build a Lending Library. We'll keep track of all our stuff and who we lent it to, so that the next time we can't remember where we put our linear compression wrench, we can simply look up who we lent it to last and get it back from them.

And when that same friend says, "Are you sure you lent it to me?", you can say, "Yeah, STEVE, I'm sure I lent it to you! I see you're enjoying your digital cable, thanks to my generous lending of said linear compression wrench. Why don't you go find it so that I too can enjoy the benefits of digital cable in my own home!"

Okay, okay, maybe STEVE forgot too. Maybe he's a dirty liar, and he sold...

Creating a reaction

Following the creation of our basic template and collection, and with Meteor putting our lists collection into the reactive context, we can now proceed to watch the reactive programming model in action.

Navigate to our Lending Library page at http://localhost:3000/ and open the browser console window.

In the console, enter the following command:

> lists.insert({Category:"Fraggles"});

You will instantly see the page update. Note that, this time, the full page didn't refresh! This is because, under the hood, Meteor is tracking changes to our reactive context (in this case, the lists collection) and the template is being updated immediately after a change is made.

Let's make a few more changes. To do this, enter the same Fraggles command again:

> lists.insert({Category:"Fraggles"});

Just as before, a new Fraggles button will instantly appear:

Creating a reaction

But, we have too many Fraggles categories now. There are a lot of Fraggles, but unless you're...

Multiple clients

Good things should be shared. Meteor gets this, and as we're about to see for ourselves, the reactive programming model allows us to share updates in real time across multiple clients.

With your Chrome web page still open to http://localhost:3000/, open a new browser tab and navigate to the same page.

Tip

If you really want to get fancy, you can conduct this same experiment with multiple browsers (Firefox, Opera, or Safari). Each session will be live and reactive!

You now have two clients open, which is simulating the application being open by different people, at different locations, with different computers. Meteor's reactive model allows you to treat all clients in the same manner, and a change made by one will be propagated to all the others.

With your eyes on the new second browser, type the following command into the console of browser #1:

> lists.insert({Category:"Vinyl Records"})

You will notice that the change propagates to both browsers, without...

Summary

In this chapter, you successfully created the framework for your new Meteor application. You saw firsthand how quickly a new project can be created, and you created database and template functionality with just a few lines of code. You saw live HTML and reactive programming in action, and you are now ready to go even deeper into the Meteor engine. You've conquered the tip of the iceberg, my friend. Take a break, have a cold one, and get ready for even more Meteor awesomeness!

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Description

This book is for developers or students who have a working knowledge of JavaScript and HTML, and want to learn how to quickly develop full-stack web applications using pure JavaScript.

Who is this book for?

This book is for developers or students who have a working knowledge of JavaScript and HTML, and want to learn how to quickly develop full-stack web applications using pure JavaScript.

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Publication date : Jun 30, 2015
Length: 138 pages
Edition : 1st
Language : English
ISBN-13 : 9781785282270
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Length: 138 pages
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Table of Contents

8 Chapters
1. Setup and Installation Chevron down icon Chevron up icon
2. Reactive Programming…It's Alive! Chevron down icon Chevron up icon
3. Why Meteor Rocks! Chevron down icon Chevron up icon
4. Templates Chevron down icon Chevron up icon
5. Data – Meteor Style! Chevron down icon Chevron up icon
6. Application Structure – Client, Server, and Public (oh my!) Chevron down icon Chevron up icon
7. Packaging and Deploying Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon
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