HTML5 iPhone Web Application Development

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贡献于2013-11-12

字数:0 关键词: iPhone开发 移动开发 HTML

HTML5 iPhone Web Application Development An introduction to web-application development for mobile within the iOS Safari browser Alvin Crespo BIRMINGHAM - MUMBAI HTML5 iPhone Web Application Development Copyright © 2013 Packt Publishing All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews. Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book. Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information. First published: May 2013 Production Reference: 1170513 Published by Packt Publishing Ltd. Livery Place 35 Livery Street Birmingham B3 2PB, UK. ISBN 978-1-84969-102-4 www.packtpub.com Cover Image by Asher Wishkerman (wishkerman@hotmail.com) Credits Author Alvin Crespo Reviewers Dale Cruse Faraz K. Kelhini Acquisition Editor Joanne Fitzpatrick Lead Technical Editor Neeshma Ramakrishnan Technical Editors Amit Ramadas Neha Shanbhag Project Coordinator Arshad Sopariwala Proofreaders Paul Hindle Chris Smith Indexer Rekha Nair Graphics Ronak Dhruv Production Coordinator Conidon Miranda Cover Work Conidon Miranda About the Author Alvin Crespo is a creative technologist strongly focused on delivering compelling user experiences through the use of frontend technologies. Utilizing the latest industry standards, he strives to move the Web forward promoting open source technologies. Having worked in startup and agency environments, he has helped build and architect complex applications for both medium and large-sized companies. First and foremost, I would like to thank my lovely wife, Janice Smith, for helping me produce this book. This has only been possible through the love and support you have given me. To my friends and family who have been there throughout the process, my love and endless thanks cannot express how awesome you all are. About the Reviewers Dale Cruse is the co-author of HTML5 Multimedia Development Cookbook by Packt Publishing and the technical editor of several other HTML5 books. He started his career in 1995 as a U.S. Army photojournalist. Since making the switch to purely digital at CBSNews.com, he's created web and mobile experiences for some of the most well-known clients in the world, including 20th Century Fox, Bloomingdale's, and MINI Cooper. Currently, he juggles being both a senior developer at Allen & Gerritsen and being a New York Yankees fan in South Boston. An in-demand speaker, you can't get him to shut up on Twitter at @dalecruse. Faraz K. Kelhini has more than a decade of software development experience in a broad range of disciplines. His core expertise and interest lies in web technologies, including PHP (as well as frameworks like Symfony and Zend framework), Python, HTML5, CSS3, JavaScript (as well as frameworks like jQuery and MooTools), and Linux/Unix operating systems. He is a professional consultant, editor, and writer who specializes in technical presentations, workshops, online content publishing, and knowledge transfer. Faraz has more than 100 articles to his credit within prominent publications such as Developer.com, .net magazine, and Smashing Magazine. When not pursuing a new technology or idea, Faraz loves practicing his DSLR photography skills. More information on his related writings, presentations, and useful tools can be found at http://eloux.com. I would like to thank you, the reader; I hope that you enjoy this book and produce a fantastic HTML5 iPhone App of your own. I look forward to hearing your feedback and seeing what you come up with! My thanks also go to my entire friends and family. www.PacktPub.com Support files, eBooks, discount offers and more You might want to visit www.PacktPub.com for support files and downloads related to your book. Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? You can upgrade to the eBook version at www.PacktPub.com and as a print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at service@ packtpub.com for more details. At www.PacktPub.com, you can also read a collection of free technical articles, sign up for a range of free newsletters and receive exclusive discounts and offers on Packt books and eBooks. TM http://PacktLib.PacktPub.com Do you need instant solutions to your IT questions? PacktLib is Packt's online digital book library. Here, you can access, read and search across Packt's entire library of books. 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Table of Contents Preface 1 Chapter 1: Application Architecture 7 Implementing the HTML5 Mobile Boilerplate 8 Downloading and installing the HTML5 Mobile Boilerplate 8 Integrating the build script 9 Creating our application framework 9 Modifying the boilerplate 10 Customizing our markup 10 Customizing our framework 14 Creating semantic markup 18 Creating the header 18 Creating the footer 19 Clearing up section 20 Structuring our stylesheets 20 Global styling 21 Defining our global fonts 21 Our page layout 22 Using content with :before and :after 23 Styling our navigation 23 Responsive design principles 25 Media queries to the rescue 25 Responsive images 26 Fluid images 26 Establishing our JavaScript architecture 27 Structuring our app functionality 28 Namespacing our application 28 Immediately Invoked Function Expressions 28 Table of Contents [ ii ] Use strict 29 Default options 29 Defining the constructor 30 The prototype 30 Defining public methods 32 Returning our constructor/function 33 Integrating a custom module template 34 Including our scripts 35 Initializing our framework 35 Routing to a mobile site 36 Redirecting via PHP 37 Redirecting via htaccess 37 Home screen icons 37 Introducing our build script 38 Configuring our build script 38 Minifying and concatenating scripts 38 Minifying and concatenating styles 39 Creating multiple environments 39 Navigating our directories 40 Building our project 40 Summary 42 Chapter 2: Integrating HTML5 Video 43 Configuring the server 43 Video formats 44 Video format directives 44 A simple HTML5 video 44 Single video format 45 Supporting multiple formats 45 Listening to HTML5 video events 46 Video markup review 47 Attaching video events 47 Initializing our video 51 Creating a JavaScript video library 52 Centralizing our events 53 Scope in JavaScript 54 Exposing functionality 55 Integrating callbacks 57 Extending callbacks 59 Using callbacks 59 Tying it all up 61 Customizing HTML5 video controls 64 Summary 70 Table of Contents [ iii ] Chapter 3: HTML5 Audio 71 Server configuration 71 Audio formats 72 Audio format directives 72 Simple HTML5 audio integration 73 MediaElement abstraction 74 Creating App.MediaElement.js 74 Initializing App.MediaElement.js 76 Extending the MediaElement API for audio 77 The base template 77 Creating an instance of MediaElement 78 Finding and caching an audio element 78 Initializing MediaElement 78 Dynamic audio player 79 The select element 79 Switching audio tracks 81 The change event listener 81 The change event handler 82 Refactoring our code 84 Initializing our Audio class 85 Customizing HTML5 audio controls 86 Creating custom media controls 86 Adding interactivity to our customized controls 88 Sequential playback 88 The markup 89 The JavaScript 90 iOS considerations 93 Volume 93 Autoplay 93 Simultaneous playback 94 Summary 95 Chapter 4: Touch and Gestures 97 Simplifying the navigation 98 Navigation markup and styling 98 The basic template 98 Styling a select component 99 Navigation interactivity 99 The basic template 100 Caching our navigation 100 Listening and handling the change event 100 Initializing the navigation 101 Table of Contents [ iv ] Touch and Gesture events 102 Touch events 102 On scroll 103 On touch and hold 103 On double-tap zoom 103 Supported touch events and how they work 103 Gestures 104 Creating a responsive photo gallery 105 Gallery markup and styling 106 The basic gallery slide list 106 Adding simple gallery controls 107 Making images responsive 107 Styling our gallery 108 Using CSS3 transitions 110 Gallery interactivity 111 The basic template 112 Caching the gallery 112 Connecting our controls 114 Gallery responsiveness 118 Extending the gallery for touch 123 The basic template 123 Default options and modularizing swipe events 124 Listening to touch events 125 Handling touch events 125 Putting it all together 127 The JavaScript 128 The markup 130 Summary 131 Chapter 5: Understanding HTML5 Forms 133 HTML5 input types 134 HTML5 attributes for forms 135 Form layout for iPhone 136 Sample HTML5 forms 137 Setup work 138 Including our forms styling 138 Updating the navigation 138 Including our navigation and forms scripts 139 The forms 139 The login form 139 The registration form 141 The profile form 144 Form validation 150 The basic template 150 Initializing our forms 151 Table of Contents [ v ] Attaching events 152 Event handlers 152 Validating our input 153 Form styling for iOS 156 Basic styling 156 Custom styling 157 Summary 161 Chapter 6: Location-aware Applications 163 Geolocation specification 163 Implementation 164 Scope, security, and privacy 164 API descriptions 165 The Geolocation interface 166 The PositionOptions interface 167 The Position interface 169 The Coordinates interface 169 The PositionError interface 170 Use cases 171 Points of interest 172 Route navigation 172 Latest information 172 Google Maps API 173 The API(s) 173 Obtaining an API key 173 Activating the service 173 Retrieving the key 174 Geolocation and Google Maps 176 Markup preparation 176 The Geolocation wrapper 180 Geolocation with Google Maps 184 Summary 188 Chapter 7: One-page Applications 189 Model-View-Controller or MVC 189 Models 190 Views 190 Controllers 190 Relationships 190 Introduction to Underscore.js 191 Implementation 191 _.extend 192 _.each 193 _.template 194 Table of Contents [ vi ] Introduction to Backbone.js 196 MVC and Backbone.js 196 Backbone models 196 Backbone views 199 Backbone collections 201 Server-side interactions 203 Our sample application 204 Application architecture 204 Basic sample architecture 205 Application markup 206 Application scripts 212 Summary 238 Chapter 8: Offline Applications 239 Application Cache 239 The manifest file 240 Manifest implementation 241 A simple example 241 The markup 242 The JavaScript 243 Debugging the cache manifest 245 Debugging in the browser 246 Debugging using JavaScript 248 Handling offline applications 249 A simple use case 249 Detecting network connectivity 250 The localStorage API 251 Summary 252 Chapter 9: Principles of Clean and Optimized Code 253 Optimizing stylesheets 254 Validating our CSS 254 W3C CSS Validator 254 Customizable options 256 Validating a successful example 257 Validating an unsuccessful example 258 CSS Lint 260 Customizable options 261 Profiling our CSS 265 Optimizing our CSS 267 Avoid universal rules 267 Don't qualify ID or Class rules 268 Never use !important 268 Modularize styles 268 Table of Contents [ vii ] Optimizing JavaScript 269 Validating JavaScript using JSLint 270 Validating a successful example using JSLint 271 Validating an unsuccessful example 272 Customizable options 274 Integrating JSLint 274 Profiling our JavaScript 275 Optimizing our JavaScript 277 Avoid globals 277 Leave the DOM alone 278 Use literals 278 Modularize functionality 279 Summary 280 Chapter 10: Creating a Native iPhone Web Application 281 Setting up the development environment 282 Getting started with Xcode 282 Installing Xcode 282 Xcode IDE overview – the basics 282 Setting up PhoneGap 289 Installing PhoneGap 290 Creating a PhoneGap project 291 The PhoneGap license 292 Configuring our project 293 Transferring a web application 294 Transferring our assets 295 Including our markup 295 Incorporating our styles 298 Inserting our scripts 299 Debugging our application 303 Logging out our code 303 Using the Safari developer tools 304 Extending our application with native functionality 305 Configuring our application 306 Setting up our contacts functionality 306 Summary 311 Index 313 Preface Web applications have come a long way since the 90s, where static HTML pages were delivered to the client. In those days, web pages had a strict client-server model, where much of the processing was done on the server and the client only presented the information with little to no interaction. Such information was only accessible through desktop computers on very slow networks. Those days have passed, and we are now connected in ways that were impossible before. From cellphones that can still make calls on the subway, to tablets presenting the latest article from your favorite newspaper 30,000 feet in the air; we are now in a digital age where information is easily accessible through innovative technologies. Yet, we still struggle to create a seamless interaction between technology and the physical world. Although we have devices that are sensitive to our touch, can detect our location, and have the ability to monitor our vital signals, it is still up to us to make applications that will change the world. The hard work that goes into creating these applications usually requires large teams, complex business roles, and costly expenses. For a brief period of time, developing these applications presented a challenge to many entrepreneurs who were looking to drive change. A staggered mobile market, which continues to this day, contributed to limited development resources. What we saw was an increase in the advancement of these technologies, but very few people who understood or were even interested in learning all the languages felt the necessity to create a cross-platform application. However, it was only a matter of time until a single platform would arrive and change the world forever. HTML5, and its implementation across devices, helped drive the force necessary to deliver a platform that allowed developers to innovate and change the world. Leveraging this technology in our applications allows us to push the limit of the hardware while creating something that many users can enjoy, no matter what device they prefer to use. Preface [ 2 ] Over the years, I have come to realize that device agnostic applications will become the norm. We have seen competitors adopt these standards with little to no impact on their success; in fact, it can be argued that it has done the opposite. For these reasons, this book was written to provide you with the techniques to create applications, based on open standards, and for the successful creation of device agnostic software. What this book covers Chapter 1, Application Architecture, helps you to learn how to create a standard architecture for iPhone web application development. We will customize the standard HTML5 Mobile Boilerplate for our needs throughout the book. Chapter 2, Integrating HTML5 Video, helps you to learn the basics of implementing an HTML5 video player within your web application. We'll review the specification and implement an exposed API to tap into. Chapter 3, HTML5 Audio, explains an implementation of the HTML5 Audio API. We'll create an audio player that utilizes the same principles from Chapter 2 to create a reusable component. Chapter 4, Touch and Gestures, helps you to learn about touch and gesture events, including the similarities and differences. We'll go over a couple of examples and more importantly, the specification to properly integrate our application's user experience. Chapter 5, Understanding HTML5 Forms, explains the new features in HTML5 forms, ultimately understanding its uses for our iOS web applications. We'll review the new inputs, their interactions, and the behaviors expected from the iOS operating system. Chapter 6, Location-aware Applications, will have Geolocation as the key point, from the specification to the full implementation in the Safari iOS browser. We'll create an example that utilizes this feature and demonstrate how we can utilize it in our own applications. Chapter 7, One-page Applications, is jam-packed with information on how to create a seamless experience in your application. We'll go over the principles of the MVC design pattern and create an example that utilizes its full potential. Chapter 8, Offline Applications, will cover key topics such as Caching, History, and local storage. The essentials will be covered and the details exposed in order for us to create true offline applications. Preface [ 3 ] Chapter 9, Principles of Clean and Optimized Code, will have us sidestepping the development process to refine our craftsmanship. We'll go over best practices, industry supported techniques, and ways to improve our code for the overall benefit of our applications. Chapter 10, Creating a Native iPhone Web Application, reviews how we can create the native application we have learned previously. Applying the same techniques we'll create native applications based on open standards. What you need for this book This book aims to provide web application development solutions specifically for iOS. With that in mind, you will need an iPhone and/or iPad, preferably an Apple computer with Mac OS X 10.8 and above. You will definitely need a text editor or IDE of your choice, including Xcode 4 and above with the iOS simulator installed. And ultimately, you'll be testing your applications in the most modern web browsers, including Safari. Who this book is for This book is intended for beginner to intermediate level developers who are diving into web application development specifically for iOS. This book begins with introductory level material, with each chapter advancing over each topic. The topics covered will give you a good idea on how to approach the development process and the steps needed to achieve those goals. Conventions In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning. Code words in text are shown as follows: "Although we've written this code previously, let's briefly review the structure of the MediaElement class." Preface [ 4 ] A block of code is set as follows:
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Application Architecture In this chapter, we will create a standard architecture for our iPhone application. We will base it on the HTML5 Mobile Boilerplate and customize it for the needs of the several projects in this book. From marking up our content in HTML5 to creating a JavaScript framework, we'll create static pages that help us focus on the foundations of iPhone Web Application development. In this chapter, we will cover: • Implementing the HTML5 Mobile Boilerplate • Creating a preliminary architecture • Customizing our framework • Creating semantic markup • Structuring our stylesheets • Responsive design principles • Establishing our JavaScript architecture • Routing to a mobile site • Home screen icons • Introducing our build script • Deploying our project Application Architecture [ 8 ] Implementing the HTML5 Mobile Boilerplate When you begin development, it is always critical to start with a basic framework that can be molded to the needs of your project. In many cases, we develop these frameworks in-house where we work, or perhaps for our own personal projects. However, the open source community has presented us with a great framework we can use in our projects—the HTML5 Mobile Boilerplate. This framework is based on the well-known HTML5 Boilerplate, and has been optimized for mobile including a lean HTML template; the utilization of Zepto, and use of tools and helpers optimized for mobile. Downloading and installing the HTML5 Mobile Boilerplate The first step we need to take is to download the HTML5 Mobile Boilerplate, which is located here: http://html5boilerplate.com/mobile/ Once the boilerplate is downloaded, you should see the following structure from the unzipped archive file: The Preliminary Directory Structure Chapter 1 [ 9 ] The next step is to take these files and place them in the directory of your choice. For example, I have placed my files in the following directory on my Mac: /Users/alvincrespo/Sites/html5iphonewebapp Next, we'll want to use a build system that helps us create multiple environments, ease the deployment process, and overall make things easier when we want to optimize our site for testing and/or production. According to the documentation for the HTML5 Mobile Boilerplate, there are two different types of build system, such as the Node Build script and the Ant Build script. In this book, we'll be using the Ant Build script. I would recommend using the Ant Build script since it has been around for a while and has the appropriate features that I use in my projects, including CSS Split, which will help split up the main CSS file that comes with the boilerplate. Integrating the build script To download the Ant Build script, go to the following link: https://github.com/h5bp/ant-build-script Then, download the zip file by clicking on the Download as zip button. When you have downloaded the Ant Build script, copy the folder and its contents to your project. Once your Ant Build script directory is fully transferred over to your project, rename the directory containing the build script to build. At this point, you should have your project completely set up for the rest of the applications in this book. We will cover how to utilize the build script later on in this chapter. Creating our application framework With every project, it's important to create a framework that adjusts to your project's needs. It's critical to think about every aspect of the project. From the required document to the team's strengths and weaknesses, it's important we establish a solid foundation that helps us build and adjust accordingly. Application Architecture [ 10 ] Modifying the boilerplate We'll now modify our boilerplate for the needs of the projects we will be building. For simplicity, we'll remove the following items from the folder: • CHANGELOG.md • crossdomain.xml • README.md • /doc (Directory) Now that the directory has been cleaned up, it's time to take a look at some of the boilerplate code and customize it for the needs of the projects in this book. Customizing our markup First, open up the application in your favorite text editor. Once we've opened up the application in the editor of our choice, let's look at index.html. The index file needs to be cleaned up in order to focus on iPhone Web Application development, and also unused items such as Google Analytics need to be removed. So let's remove some code that is not necessary for us. Look for the following code: 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. And modify it to this: Chapter 1 [ 11 ] What we've done here is removed detection for IE Mobile. Although this may be helpful for other projects, for us it doesn't really help in creating a fully compatible application just for the iPhone. However, we also need to remove an IEMobile specific meta tag: The previous meta tag turns on cleartype (a utility that assists with the rendering of fonts) for the IE mobile. This isn't necessary for us and is not a requirement for our applications. Now that we've removed some unnecessary markup from our page, we can go ahead and start enabling features that will enhance our application. Look for the following meta tags and enable them, by removing the comments surrounding them: These directives inform our application that it can run in fullscreen and they set the status bar to black. We can also remove the following code from the of the document: Once we've removed the previous script, your markup should now look like the following: Application Architecture [ 12 ] Now, we can focus on cleaning up our body. Lucky for us, we only need to remove one thing—Google Analytics, since we will not be focusing on tracking for iPhone Web Apps. To do this, find the following code and remove it: The only scripts that you should have on the page should be the following: Once we've completed the previous steps, our markup should be clean and simple as follows: Chapter 1 [ 13 ] From here, we should examine our stylesheets and scripts for every project and optimize it as much as we can prior to beginning a project. However, this boilerplate that we will be using has been optimized by the community and continuously enhanced with support from many developers, and for our use here, both styles and scripts are good to go. If you are curious, I encourage you to look at the normalize. css file, which contains excellent directives for resetting a page. It would also be beneficial to review the main.css file that has been enhanced with this boilerplate to support mobile devices. Now, we'll move on to establishing our framework. Application Architecture [ 14 ] Customizing our framework It's critical for developers to establish a framework for each project they are working on, no matter how small or big the project may be. Of course, your framework should adjust to the requirements that the project demands as well. In this section, we'll establish a simple framework that we can work with throughout the use of this book. We've gone through and cleaned up the boilerplate for our needs, now we'll go through and expand upon the boilerplate to include the files that are critical to the applications we will build. The first application will be based on the HTML5 Video specification (http://dev. w3.org/html5/spec-author-view/video.html). In that application we'll create a specific functionality for our video player that includes play, pause, and fullscreen functionalities. So let's create a directory specific to this application; we'll call this directory video. In this directory, we'll create an index.html file and copy the contents from the homepage of the index.html file. Now that we have our video section created, let's create the video.css file inside of our css directory. Then, create an App directory within our /js folder. Within the /js/App directory, let's create an App.js file. Later, we'll explain in detail what this file is, but for now it will be our main application namespace that will essentially encapsulate global functionality for our application. Finally, let's create an App.Video.js file that will contain our video application functionality within the /js/App directory. You will now repeat the previous steps for each of our applications; including Video, Audio, Touch, Forms, Location, Single Page, and Offline. In the end, your directory structure should have the following new directories and files: /audio index.html /css audio.css forms.css location.css main.css normalize.css singlepage.css Chapter 1 [ 15 ] touch.css video.css /forms index.html /js /App/App.Audio.js /App/App.Forms.js /App/App.js /App/App.Location.js /App/App.SinglePage.js /App/App.Touch.js /App/App.Video.js /location index.html /offline index.html /singlepage index.html /touch index.html /video .index.html At this point, we should fix the references to our dependencies, such as our JavaScript and stylesheet. So let's open up /video/index.html. Let's modify the following lines: Change the previous markup to the following: Note that we add ../ to each dependency. This is essentially telling the page to go up one level and retrieve the appropriate files. We also need to do this for the apple-touch-icon-precomposed links, shortcut icon, and the scripts at the bottom of the page. Application Architecture [ 16 ] Our framework is now almost complete, except that they aren't connected yet. So now that we've got everything organized, let's start hooking up everything to one another. It won't look pretty, but at least it will be working and moving towards a fully functional application. Let's start with the main index.html file, /ourapp/index.html. Once we've opened up the main index.html file, let's create a basic site structure inside our element. We'll give it a class of "site-wrapper" and put it right below the comment Add your site or application content here:
Within the wrapper containing our site, let's use the new HTML5