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Home > Mobile > Cross Platform Mobile Development > PhoneGap and AngularJS for Cross-platform Development
PhoneGap and AngularJS for Cross-platform Development
PhoneGap and AngularJS for Cross-platform Development

PhoneGap and AngularJS for Cross-platform Development: Build exciting cross-platform applications using PhoneGap and AngularJS

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PhoneGap and AngularJS for Cross-platform Development

Chapter 1. Introduction to AngularJS

Welcome to the world of AngularJS with PhoneGap! In this book, you will learn how to merge two very exciting technologies, namely AngularJS and PhoneGap. By the end of this book, you will have a working mobile app that works across iOS and Android, based on AngularJS and PhoneGap. As mentioned previously, this book is targeted at programmers who have knowledge of PhoneGap, but may or may not have knowledge regarding AngularJS. You should have some idea about JavaScript though, for you to get maximum benefit out of this book. That said, let us begin with AngularJS.

A brief overview of AngularJS

AngularJS (https://angularjs.org/) is a super heroic JavaScript MVC framework, which is maintained by Google. It is open source and its main goal is to assist with creating single page applications. These are typically one-page web applications that only require HTML, CSS, and JavaScript on the client side.

While one may argue that there are already many frameworks out there in the market that help with this issue, I would like to say that AngularJS is different in a few ways. And in quite a few of these instances, it makes your life much easier as a frontend programmer.

Core concepts

There are many concepts related to AngularJS, but I will cover the most commonly used ones for the sake of progressing through this chapter. As we go along in this book, I'll touch on other concepts, such as the use of self-defined directives and performing RESTful requests via AngularJS. The main concepts that you should understand in this section are directives, controllers, and data binding.

Controllers

If you have already used JavaScript frameworks, such as BackBone.js, Can.js, Ember.js, or KnockOut.js, you should be familiar with this concept. Controllers are the behavior behind the DOM elements. AngularJS lets you express the behavior in a clean readable form without the usual boilerplate of updating the DOM, registering callbacks, or watching model changes.

Data-binding

Data-binding is an automatic way to update the view whenever the model changes, as well as updating the model whenever the view changes. The coolest aspect of this concept is that it is a two way data-binding process. Used in tandem with controllers, this can save you a lot of code, as there is no need for you to write the usual updating of the DOM elements.

Directives

Directives are another awesome concept in AngularJS. What they do is teach your application new HTML syntax and new things specific to your application. Directives can be self-defined and predefined. Some of the more notable predefined directives include:

  • ng-app: This declares an element as a root element of the application, allowing its behavior to be modified through custom HTML tags.
  • ng-bind: This automatically changes the text of an HTML element to the value of a given expression.
  • ng-model: This is similar to ng-bind, but allows two-way binding between the view and scope.
  • ng-controller: This specifies a JavaScript controller class, which evaluates HTML expressions. In layman's terms, what ng-controller does is that it applies a JavaScript function to this block of HTML so that this particular JavaScript function (including its accompanying logic, expressions, and more) can only operate in this block of HTML.
  • ng-repeat: You can see this as a loop through a collection.

A conceptual example

Now, let's take a look at how some of the previous concepts play together. Consider the following piece of code:

<!doctype html>
<html ng-app>
  <head>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.12/angular.min.js"></script>
  </head>
  <body>
    <div>
      <label>Say Hello World</label>
      <input type="text" ng-model="yourHelloWorld" placeholder="Type anything here.">
      <hr>
      <h1>Hello {{yourHelloWorld}}!</h1>
    </div>
  </body>
</html>

Tip

Downloading the example code

You can download the example code files for all Packt books you have purchased from your account at http://www.packtpub.com. If you purchased this book elsewhere, you can visit http://www.packtpub.com/support and register to have the files e-mailed directly to you.

Let's go through the code.

  • We defined an HTML5 HTML document in this case, as seen in the first line
  • Next, notice ng-app in the second line of the code; this is an AngularJS directive, which tells AngularJS that this is the root of the AngularJS application
  • In order to use AngularJS, we obviously have to install the script on this web page, as shown in the <script> tag
  • Within the body tag, we see a label, an input, and an h1 tag.
  • Take note of the input tag, there is a ng-model directive, which is mapped to h1 tag's {{yourHelloWorld}}
  • What the previous piece of code does is that anything that is typed into the input box, will be shown in place of {{yourHelloWorld}}

Take note of the version of the code we are using in this chapter, version 1.2.12; should you be using newer versions of AngularJS, there is no guarantee that the code will work.

Now that we have briefly walked through the code, let us copy the code and run it on our web browser. Feel free to copy the code and save it as concepts.html. The source code for this chapter can be found in the concepts.html file in the Chapter 1 folder.

Copied the code? If so, open the file in your favorite web browser. You should see the following screenshot in your browser:

A conceptual example

A sample concept web page

Got the previous code? Ok great! So now you can try typing into the input box and see new text being appended to Hello and before ! in the screen.

For instance, when we type world, we will see the new characters being appended to the screen as I continue to type. By the end of typing the word "World", we should see the following screenshot:

A conceptual example

After typing World

Now that we have a brief idea as to how a simple AngularJS app works, let us move to a more complicated app.

A simple to-do list using AngularJS

In this example, we will cover in detail as to how to write code for a slightly more complicated AngularJS app. This app is modified from the official example found at angularjs.org. This example will be used as a base when we convert it from a web application to a PhoneGap application.

Preparing your code structure

For starters, create the index.html and todo.js files. Just for your information, the code found in this section can be found in the todo folder in Chapter 1.

HTML for our to-do list

We need to prepare our HTML file so that we can make use of AngularJS. Similar to the previous concepts.html file, you will see that we have included the use of AngularJS via script. Open up your index.html file in your favorite editor and you can start by adding the following code:

<!doctype html>
<html ng-app>
  <head>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.12/angular.min.js"></script>
    <script src="todo.js"></script>
    <link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css">
    <style>
      body {
        padding:40px;
      }
      #todoDetails {
        visibility: hidden;
      }
    </style>
  </head>
  <body>
    <div class="row"  ng-controller="todoCtrl">
      <div class="col-md-6">
        <h2>Todo</h2>
        <div>
          <span>{{getRemaining()}} of {{todos.length}} remaining</span>
          [ <button ng-click="archive()">archive</button> ]
          <ul class="unstyled">
            <li ng-repeat="todo in todos">
              <input type="checkbox" ng-model="todo.done">
              <span class="done-{{todo.done}}">{{todo.text}}</span>
              <button ng-click="showDetail(todo.text)">Detail</button>
            </li>
          </ul>
          <form ng-submit="addTodo()">
            <input type="text" ng-model="todoText"  size="30"
                   placeholder="add new todo here">
            <input class="btn-primary" type="submit" value="add">
          </form>
        </div>
      </div>
      <div id="todoDetails" class="col-md-6" >
        <h2>Details</h2>
        Title: <span id="title">{{currentText}}</span>
        <br>
        Add Details:
        <form ng-submit="addDetails()">
          <textarea id="details" ng-model="currentDetails">{{currentDetails}}</textarea>
          <p>
          <input class="btn-primary" type="submit" value="Add Details">
          <input class="btn-primary" type="submit" value="Cancel" ng-click="closeThis()">
        </p>
        </form>
      </div>
    </div>
  </body>
</html>

Now, to make sure that you are on the same page as I am, I want you to open this file in your favorite browser. You should see something like the following screenshot:

HTML for our to-do list

Our HTML template

Got the previous code? It looks weird now due to the fact that we have not added the main JavaScript functionalities. We will be working on it in the next section.

Now, let me explain the code; notice that I have highlighted a few lines of it. These are the most important lines of the code that you should take note of in this example. The remaining lines are just the usual HTML code.

  • The first two lines of the highlighted code simply install AngularJS and include BootStrap 3's CSS for styling purposes. Without both, the project will not work and may not look good.
  • The ng-controller directive is what we covered briefly earlier on in this chapter. We are applying todoCtrl to this block of HTML.
  • The ng-click directive is another directive that we did not touch on in the previous section. What ng-click does is that it executes whatever function is defined for this directive. In our example, ng-click="archive()" means that on clicking it, archive() will be executed. The JavaScript function archive() is written in our todo.js file, which we will cover later.
  • The ng-repeat directive is a directive that loops through a collection. Notice how we implemented ng-repeat in our HTML code:
    <li ng-repeat="todo in todos">
   <input type="checkbox" ng-model="todo.done">
   <span class="done-{{todo.done}}">{{todo.text}}</span>
   <button ng-click="showDetail(todo.text)">Detail</button>
 </li>

    Anything that is within <li> is dependent on the todo object, which is part of the todos collection.

  • The ng-submit directive is generally used in forms. This is a directive which controls what is being done on the submit form. In this case, on the submit form, we will execute the JavaScript function addToDo().
  • The [] option encapsulates <button ng-click="archive()">archive</button>, which simply adds a square bracket around the button.

Adding in JavaScript with AngularJS

Now we will open our todo.js file, which we created in the previous section. Open todo.js in your favorite text editor. Let us begin by coding the following:

function todoCtrl($scope) {

}

We are first going to define a controller, which we will be using for our app. Notice that we have named it todoCtrl, which is mapped onto ng-controller in the HTML file (index.html), where ng-controller="todoCtrl" means that todoCtrl will be controlling this portion of the web page.

Also, notice the use of $scope, which is an object that refers to the application model; it is the execution context for related expressions, such as ng-click, ng-model, and so on. Any such expressions of a predefined directive outside this scope will not be executed.

Let's start by initializing our to-do list. Within todoCtrl, add the following code:

  $scope.todos = [
    {text:'here is my first to do', done:true, details:''},
    {text:'continue writing chapter 1 for this book', done:false, details:''},
    {text:'work on chapter 2 examples', done:false, details:''}
  ];

  $scope.currentText = ''; // make the text empty
  $scope.currentDetails = ''; // make the text empty

What $scope.todos does is that it simply creates a list of objects, which contains the text, details, and whether this to-do is executed or not (true or false). Notice that todos here is mapped to the collection todos as seen in index.html, where ng-repeat is being used.

Let's move on by adding more functionalities. After $scope.currentDetails, add the following three JavaScript functions:

  $scope.addTodo = function() {
    $scope.todos.push({text:$scope.todoText, done:false, details:''});
    $scope.todoText = '';
  };
 
  $scope.remaining = function() {
    var count = 0;
    angular.forEach($scope.todos, function(todo) {
      count += todo.done ? 0 : 1;
    });
    return count;
  };
 
  $scope.archive = function() {
    var oldTodos = $scope.todos;
    $scope.todos = [];
    angular.forEach(oldTodos, function(todo) {
      if (!todo.done) $scope.todos.push(todo);
    });
  };

The $scope.todoText function resets todoText after it has been pushed into the array. The $scope.addTodo function does what it is suppose to do, simply adding a new to-do to the list of todos as defined earlier. The beauty of AngularJS is that it uses standard JavaScript data structures that make manipulation so much easier.

The $scope.getRemaining function simply calculates the number of items that are not done yet. Here, we can see two-way data-binding in action as this function executes whenever there is a change in the length of todos.

The $scope.archive function marks a to-do as done:true in standard JavaScript manner.

By now, you should have noticed that all the JavaScript functions defined here are being used in index.html under ng-controller="todoCtrl".

Let's now add three more JavaScript functions to complete the finishing touch for this sample application.

After the $scope.archive function, add the following functions:

  $scope.showDetail = function(text) {
    var result = $scope.todos.filter(function (obj) {
      return obj.text == text;
    })
    $scope.currentText = result[0].text;
    $scope.currentDetails = result[0].details;
    document.getElementById('todoDetails').style.visibility = 'visible';
  }

  $scope.closeThis = function() {
    $scope.currentText = '';
    $scope.currentDetails = '';
    document.getElementById('todoDetails').style.visibility = 'hidden';
  }

  $scope.addDetails = function(text) {
    var result = $scope.todos.filter(function (obj) {
      return obj.text == text;
    })
angular.forEach($scope.todos, function(todo) {
      if(todo.text == text) {
        todo.details = $scope.currentDetails;
      }
    });
    document.getElementById('todoDetails').style.visibility = 'hidden';
    
  }

The $scope.showDetail function simply retrieves the current to-do being clicked on and shows it on the div with ID #todoDetails. The visibility of the #todoDetails function is then set to visible.

The $scope.close function simply changes the visibility of #todoDetails to hidden.

Finally, $scope.addDetails adds the details of the todo item, and changes the visibility of #todoDetails to hidden once done.

Okay, so to see if we are on the same page, we now need to check our code. Save this file as todo.js. Refresh your browser and you should still see the same user interface as per the previous screenshot.

Now, try clicking on the Detail button in front of work on chapter 2 examples, and you should see the following screenshot:

Adding in JavaScript with AngularJS

Details of the ToDo item shows on clicking on the corresponding detail button

You will see the details of a particular to-do item. You can try to add some details for this item and click on Add Details. You can then click on other items and come back to this item later (without refreshing the browser), and you should still see the details in the text area.

You can also check off any of the items and you will see that the number of remaining to-do item decreases:

Adding in JavaScript with AngularJS

Number of items changes dynamically as you check off items

And of course, you can add new items by simply typing in the input box and clicking on the add button. You should notice that the number of items now increases:

Adding in JavaScript with AngularJS

Adding new to-dos changes the number of items dynamically and also shows on the screen immediately

Summary

To summarize what we have done in this chapter; we have walked through the basics of building an AngularJS app and familiarized ourselves with the basic concepts used in AngularJS. We have made use of ng-app, ng-controller, ng-click, ng-repeat, and ng-submit in general. These expressions, such as ng-click and ng-submit are typically mapped onto JavaScript functions defined in AngularJS controllers, as seen in todo.js in our example. Notice how little code we have written in order to achieve such speedy UX through the concept of two-way data-binding and its controllers.

In the next chapter, we will start to port this app in a more organized manner to PhoneGap.

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Page 1 of 4

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Description

PhoneGap is a mobile development framework that allows developers to build cross-platform mobile applications. Building PhoneGap apps is traditionally done using HTML, CSS, jQuery Mobile, Eclipse Editor, and/or Xcode. The process can be cumbersome, from setting up your editor to optimizing your usage of jQuery, and so on. However, AngularJS, a new but highly popular JavaScript framework, eases these tasks with APIs to get access to mobile APIs such as notifications, geo-location, accelerometers, and more. Starting with the absolute basics of building an AngularJS application, this book will teach you how to quickly set up PhoneGap apps using the command-line interface. You will learn how to create simple to advanced to-do lists and add authentication capabilities using PhoneGap's plugins. You will enhance your skills by writing a PhoneGap app using your newly learned AngularJS skills. Furthermore, you will learn about adding animation and interactive designs to your mobile web apps using PhoneGap plugins. By the end of the book, you will know everything you need to launch your app on both Android and iOS devices.

Who is this book for?

This book is intended for people who are not familiar with AngularJS and who want to take their PhoneGap development skills further by developing apps using different JavaScript libraries. People with some knowledge of PhoneGap, HTML, CSS, and JavaScript will find this book immediately useful.

What you will learn

  • Learn about the features of AngularJS and use it to organize your code
  • Create RESTful web apps using AngularJS
  • Reduce the hassle of developing PhoneGap apps using the commandline interface
  • Quickly integrate AngularJS to enhance authentication capabilities via PhoneGap plugins
  • Use AngularJS touch modules to optimize your PhoneGap app
  • Build a crossplatform application with PhoneGap and AngularJS
  • Learn how to use the concepts of twoway data binding and directives along with PhoneGap for mobile application development

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Oct 31, 2014
Length: 122 pages
Edition : 1st
Language : English
ISBN-13 : 9781783988938
Category :
Mobile
Languages :
JavaScript
Concepts :
Cross Platform Mobile Development
Tools :
PhoneGap

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Publication date : Oct 31, 2014
Length: 122 pages
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Language : English
ISBN-13 : 9781783988938
Category :
Mobile
Languages :
JavaScript
Concepts :
Cross Platform Mobile Development
Tools :
PhoneGap

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Table of Contents

8 Chapters
1. Introduction to AngularJS Chevron down icon Chevron up icon
1. Introduction to AngularJS
A brief overview of AngularJS
A simple to-do list using AngularJS
Summary
2. Getting Ready for PhoneGap Chevron down icon Chevron up icon
2. Getting Ready for PhoneGap
Preparing for PhoneGap development
Command-line interface for both Android and iOS
AngularJS on PhoneGap
Creating a to-do list app using AngularJS on PhoneGap
Summary
3. From a Simple To-do List to an Advanced To-do List Chevron down icon Chevron up icon
3. From a Simple To-do List to an Advanced To-do List
Rewriting the simple to-do list app
Wiring up a backend server
Preparing for PhoneGap
Testing our code on iOS
Testing our code on Android
Summary
4. Adding Authentication Capabilities Using PhoneGap Plugins Chevron down icon Chevron up icon
4. Adding Authentication Capabilities Using PhoneGap Plugins
Adding Facebook Connect to the to-do list app
Facebook login for PhoneGap
From web to PhoneGap
The to-do list app with Facebook Login on PhoneGap
Summary
5. Sprucing Up the App Using Animations and Mobile Design Chevron down icon Chevron up icon
5. Sprucing Up the App Using Animations and Mobile Design
Adding animations to your web app
Adding mobile CSS styles to your app
Porting your web app to PhoneGap
Summary
6. Getting Ready to Launch Chevron down icon Chevron up icon
6. Getting Ready to Launch
Deploying server.py
Using phonegap.com
Preparing your PhoneGap app for an Android release
iOS
Summary
A. References Chevron down icon Chevron up icon
A. References
AngularJS and related libraries
PhoneGap and related references
Others
Other tutorials
Index Chevron down icon Chevron up icon
Index

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Apps and Services with .NET 8
Apps and Services with .NET 8
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Dec 2023 798 pages
Full star icon 4.8 (22)
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  • eBook eBook ₱579.99
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Flutter Design Patterns and Best Practices
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Sep 2024 362 pages
Full star icon 5 (3)
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Customer reviews

Rating distribution
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(2 Ratings)
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1 star 0%
Amazon Customer Nov 21, 2015
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
I bought the kindle version of the book, but wasted a lot of time trying to figure out why some of the programs weren't working as they should. There were 5 separate mistakes/typos which caused errors or the programs not to run before I had even finished chapter 3. The downloadable content only seems to be available for chapters 1,2 and 5 for some reason which meant I was stumped on chapter 3. The actual book seemed quite useful, but was let down by the mistakes and missing content.
Amazon Verified review Amazon
fabricio Jan 01, 2015
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Although the book covers the basic steps to create a phonegap application with angular, it doesn't go much further.Certain things such as angular routes, files urls and such aren't covered.It's a nice intro to the subject, but nothing more.
Amazon Verified review Amazon

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About the authors

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Profile icon Yuxian E Liang
Yuxian E Liang
Yuxian, Eugene Liang is a frontend engineer with working knowledge of UX and data mining / machine learning. He builds applications predominantly using JavaScript/Python, and related frameworks such as AngularJS, ReactJS, Node.js, Tornado, and Django. He led a team of two (including himself) to win Startup Weekend at Taiwan recently. He has also completed academic research on social network analysis (link prediction) using machine learning techniques, while interning as a frontend engineer at Yahoo!. To know more about him, visit http://www.liangeugene.com.
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Profile icon Eugene Liang
Eugene Liang
Y.E Liang is a researcher, author, web developer, and business developer. He has experience in both frontend and backend development, particularly in engineering, user experience using JavaScript/CSS/HTML, and performing social network analysis. He has authored multiple books and research papers.
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