6. Application Events and Storage | Phonegap for Enterprise

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Phonegap for Enterprise

By : Kerri Shotts

4.5 (6)

Phonegap for Enterprise

4.5 (6)

By: Kerri Shotts

Overview of this book

This book is intended for developers who wish to use PhoneGap to develop useful, rich, secure mobile applications for their enterprise environment. The book assumes you have working knowledge of PhoneGap, HTML5, CSS3, and JavaScript, and a reasonable understanding of networking and n-tier architectures.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. PhoneGap and Enterprise Mobility

1. PhoneGap and Enterprise Mobility

Why PhoneGap/Cordova?

History behind PhoneGap and Cordova

Easy cross-platform development

Cordova app architecture

Summary

2. Building the Data Store and Business Logic

2. Building the Data Store and Business Logic

Introducing Tasker

Server architecture

Designing your data models

Designing the business logic

Permissions model

Summary

3. Securing PhoneGap Apps

3. Securing PhoneGap Apps

General security precautions

Server-specific security precautions

Cordova-specific security precautions

Summary

4. Building the Middle-Tier

4. Building the Middle-Tier

Middle-tier architecture

Designing a RESTful-like API

Building our API using Node.js

Summary

5. Communicating between Mobile and the Middle-Tier

5. Communicating between Mobile and the Middle-Tier

Getting started

Promises

Ensuring secure communication

Communicating with the backend using XHR

Authenticating the user with the backend

Summary

6. Application Events and Storage

6. Application Events and Storage

Getting ready

Determining network connectivity

Getting the current network type

Detecting changes in connectivity

Handling connectivity issues

Handling changes in the application state

Responding to application-level events

Storing local data using SQLite

Storing data in the iOS Keychain

Summary

7. Push Notifications

7. Push Notifications

Delving into Push Notification architecture

Boxcar Universal Push Notifications Platform

Setting up Google Cloud Messages with Boxcar

Integrating Boxcar with PhoneGap/Cordova

Receiving Pushes from Boxcar

Sending a Push via Boxcar

Summary

8. Building the Presentation Tier

8. Building the Presentation Tier

Mock-up design tools

Libraries and frameworks

Common patterns

Presentation of the app

Seeing it in action

Summary

A. Useful Resources

A. Useful Resources

Chapter 1 – PhoneGap and Enterprise Mobility

Chapter 2 – Building the Data Store and Business Logic

Chapter 3 – Securing PhoneGap Apps

Chapter 4 – Building the Middle-Tier

Chapter 5 – Communicating between Mobile and the Middle-Tier

Chapter 7 – Push Notifications

Chapter 8 – Building the Presentation Tier

Index

Index

Responding to application-level events

Although you can have the code that responds to events in the same handler, it's often better to have this code localized to the files (simply for readability and understandability). This means that the event handlers we've discussed so far simply become dispatchers on receipt of an event; they might notify any number of methods in the app when the event occurs.

A lot of JavaScript and UI frameworks have built-in methods to support this event notification system, but here we'll be generic. Such a system needs three methods: a method to register a listener for an event, a method to remove the listener, and a method to dispatch the event to all the listeners. We can define these methods in www/js/app/main.js.

First, let's define an object to hold our events and listeners, and then define addGlobalEventListener:

var globalEventListeners = {};
APP.addGlobalEventListener = function
addGlobalEventListener( event, listener ) {
  var EVENT = event.toUpperCase...

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