Book Image

Offline First Web Development

By : Daniel Sauble
Book Image

Offline First Web Development

By: Daniel Sauble

Overview of this book

When building mobile apps, it’s easy to forget about the moments when your users lack a good Internet connection. Put your phone in airplane mode, open a few popular apps, and you’ll quickly see how they handle being offline. From Twitter to Pinterest to Apple Maps, some apps might handle being offline better—but very few do it well. A poor offline experience will result in frustrated users who will abandon your app, or worse, turn to your competitor’s apps Expert or novice, this book will teach you everything you need to know about designing and building a rigorous offline app experience. By putting the offline experience first, you’ll have a solid foundation to build upon, avoiding the unnecessary stress and frustration of trying to retrofit offline capabilities into your finished app. This basic principle, designing for the worst-case scenario, could save you countless hours of wasted effort.
Table of Contents (17 chapters)
Offline First Web Development
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Building an offline to-do app


We cut some corners to put the wireframes in code. Let's get them the rest of the way there, make the pages functional, and set up the backing storage. After we've done this, we'll deploy the app to our phone and call it a day.

Breaking the views into their own files

Create three empty files in todo-app/app/view/:

  • List.js

  • New.js

  • Edit.js

Now, break out the code for each tab in Main.js and put each into a separate file in the todo-app/app/view/ directory with a few modifications.

First, take the contents of the innermost items array for the List view and put it in List.js in the following code block:

Ext.define('TodoApp.view.List', {
    extend: 'Ext.Panel',
    alias: 'widget.todo-list',

    config: {
    items: [
      {
        docked: 'top',
        xtype: 'titlebar',
        title: 'Things to do',
        items: {
          align: 'right',
          text: 'Add'
        }
      },
      {
...
      }
    ]
    }
});

Now, do this for the New and Edit views as...