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HTML5 Web Application Development By Example : Beginner's guide

HTML5 Web Application Development By Example : Beginner's guide

By : Jody Gustafson
4.3 (4)
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HTML5 Web Application Development By Example : Beginner's guide

HTML5 Web Application Development By Example : Beginner's guide

4.3 (4)
By: Jody Gustafson
Buy this Book

Overview of this book

HTML5's new features have made it a real application development platform with widespread adoption throughout the industry for this purpose. Being able to create one application that can run on virtually any device from phone to desktop has made it the first choice among developers. Although JavaScript has been around for a while now, it wasn't until the introduction of HTML5 that we have been able to create dynamic, feature-rich applications rivaling those written for the desktop. HTML5 Web Application Development By Example will give you the knowledge you need to build rich, interactive web applications from the ground up, incorporating the most popular HTML5 and CSS3 features available right now. This book is full of tips, tools, and example applications that will get you started writing your own applications today. HTML5 Web Application Development By Example shows you how to write web applications using the most popular HTML5 and CSS3 features. This book is a practical, hands-on guide with numerous real-world and relevant examples. You will learn how to use local storage to save an application's state and incorporate CSS3 to make it look great. You will also learn how to use custom data attributes to implement data binding. We'll use the new Canvas API to create a drawing application, then use the Audio API to create a virtual piano, before turning it all into a game. The time to start using HTML5 is now. And HTML5 Web Application Development by Example will give you the tips and know-how to get started.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Time for action – heading
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Reader feedback
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Customer support
Lock Free Chapter
1
1. The Task at Hand
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1. The Task at Hand
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The components of an HTML5 application
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Time for action – creating the HTML file
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Time for action – creating the CSS file
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Time for action – creating the JavaScript file
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Creating our first application
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Time for action – creating a tasklist
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Time for action – removing a task from the list
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Time for action – moving tasks within the list
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HTML templates
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Time for action – implementing a template
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Time for action – editing a task in the list
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Saving the state of the application
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Time for action – creating a localStorage wrapper
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Time for action – storing the tasklist
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Time for action – loading the tasklist
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Summary
2
2. Let's Get Stylish
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2. Let's Get Stylish
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CSS3 overview
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Rounded corners
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Shadows
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Time for action – styles in action
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Backgrounds
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Time for action – adding a gradient and button images
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Transitions
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Transforms
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Time for action – effects in action
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Dynamic stylesheets
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Time for action – adding a theme selector
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Filling the window
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Time for action – expanding the application
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Summary
3
3. The Devil is in the Details
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3. The Devil is in the Details
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HTML5 input types
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Task details
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Time for action – adding task details
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Time for action – hiding task details
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Custom data attributes
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Data binding with custom attributes
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Time for action – building a data model
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Time for action – implementing the bindings
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Time for action – loading the task list
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Queuing up changes
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Time for action – delaying the saves
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Summary
4
4. A Blank Canvas
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4. A Blank Canvas
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HTML5 canvas
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Getting a context
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Canvas basics
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Canvas pad
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Time for action – creating a canvas pad
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Time for action – showing the coordinates
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Drawing lines
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Time for action – using the mouse to draw
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Changing context properties
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Time for action – adding context properties
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Creating a toolbar
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Time for action – creating a toolbar
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Time for action – implementing a reusable toolbar
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Adding a toolbar
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Time for action – adding the toolbar object
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Time for action – initializing menu items
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Adding drawing actions
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Time for action – creating drawing actions
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Time for action – saving and restoring
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Adding drawing tools
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Time for action – adding a line tool
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Time for action – adding a rectangle tool
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Time for action – adding a circle tool
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Summary
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5. Not So Blank Canvas
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5. Not So Blank Canvas
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Drawing text
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Time for action – adding a text tool
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Transformations
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Time for action – adding an Ellipse tool
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Time for action – exporting an image
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Handling touch events
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Time for action – adding touch event handlers
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Photo Pad
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Time for action – creating Photo Pad
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The File API
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Time for action – loading an image file
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Adding effects
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Time for action – the imageEffects object
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Time for action – black and white
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Time for action – sepia
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Image distortion
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Time for action – making waves
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Summary
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6. Piano Man
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6. Piano Man
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HTML5 audio overview
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Loading audio files
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Time for action – creating an AudioManager object
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HTML5 piano application
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Time for action – creating a virtual piano
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Time for action – loading the notes
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Time for action – playing the notes
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Keyboard events
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Time for action – adding keyboard events
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Volume and sustain controls
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Time for action – adding a sustain control
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Time for action – adding a volume control
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Audio tools
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Summary
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7. Piano Hero
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7. Piano Hero
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Creating Piano Hero
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Time for action – creating the splash panel
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Time for action – creating the game panel
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Time for action – creating the controller
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Creating an audio sequencer
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Time for action – creating AudioSequencer
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Playing a song
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Time for action – adding the audio sequencer
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Creating animated notes
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Time for action – adding notes
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Time for action – animating the notes
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Handling user input
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Time for action – checking the notes
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Ending the game
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Time for action – creating the results panel
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Summary
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8. A Change in the Weather
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8. A Change in the Weather
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Introduction to Ajax
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Time for action – creating a weather widget
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Time for action – getting XML data
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Time for action – getting JSON data
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HTML5 Geolocation API
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Time for action – getting geolocation data
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Using web services
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Time for action – calling the weather service
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Summary
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9. Web Workers Unite
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9. Web Workers Unite
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Web workers
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Time for action – using a web worker
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The Mandelbrot set
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Time for action – implementing the algorithm
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Creating a Mandelbrot application
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Time for action – creating a Mandelbrot application
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Time for action – Mandelbrot using a web worker
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Debugging web workers
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Summary
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10. Releasing an App into the Wild
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10. Releasing an App into the Wild
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Combining and compressing JavaScript
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Time for action – creating a release script
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HTML5 Application Cache
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Time for action – creating a cache manifest
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Summary
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A. Pop Quiz Answers
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Chapter 1, The Task at Hand
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Chapter 2, Let's Get Stylish
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Chapter 3, The Devil is in the details
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Chapter 4, A Blank Canvas
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Chapter 5, Not So Blank Canvas
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Chapter 6, Piano Man
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Chapter 7, Piano Hero
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Chapter 8, A Change in the Weather
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Chapter 9, Web Workers Unite
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Chapter 10, Releasing an App into the Wild
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Index
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Index

Time for action – moving tasks within the list

While we're at it, let's add buttons to move tasks up and down in the list. For this we'll add some more code to the addTaskElement() method. First we need to create move-up and move-down buttons, and then add them to the list element along with the delete button.

function addTaskElement(taskName)
{
    var $task = $("<li></li>");
    var $delete = $("<button class='delete'>X</button>");
    var $moveUp = $("<button class='move-up'>^</button>");
    var $moveDown = $("<button class='move-up'>v</button>");
    $task.append($delete)
        .append($moveUp)
        .append($moveDown)
        .append("<span class='task-name'>" + taskName +
                "</span>");
    $("#task-list").append($task);
    
    $delete.click(function() { $task.remove(); });
    $moveUp.click(function() {
        $task.insertBefore($task.prev());
    });
    $moveDown.click(function() {
        $task.insertAfter($task.next());
    });
}

When the move up or move down button is clicked, it finds the previous or next task element using the prev() and next() methods. Then it uses the jQuery insertBefore() and insertAfter() methods to move the task element up or down in the tasklist.

What just happened?

We added buttons to each task element so that we can delete them or move them up and down in the order of the list. We learned how to use the jQuery remove(), insertBefore(), and insertAfter() methods to modify the DOM.

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