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HTML5 Data and Services Cookbook

HTML5 Data and Services Cookbook

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HTML5 Data and Services Cookbook

HTML5 Data and Services Cookbook

4.3 (7)

Overview of this book

HTML5 is everywhere. From PCs to tablets to smartphones and even TVs, the web is the most ubiquitous application platform and information medium bar. Its becoming a first class citizen in established operating systems such as Microsoft Windows 8 as well as the primary platform of new operating systems such as Google Chrome OS. "HTML5 Data and Services Cookbook" contains over 100 recipes explaining how to utilize modern features and techniques when building websites or web applications. This book will help you to explore the full power of HTML5 - from number rounding to advanced graphics to real-time data binding. "HTML5 Data and Services Cookbook" starts with the display of text and related data. Then you will be guided through graphs and animated visualizations followed by input and input controls. Data serialization, validation and communication with the server as well as modern frameworks with advanced features like automatic data binding and server communication will also be covered in detail.This book covers a fast track into new libraries and features that are part of HTML5!
Table of Contents (21 chapters)
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HTML5 Data and Services Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
3
Index

Using a drag-and-drop file area


With HTML5 we have another alternative for reading user files: we can use drag-and-drop areas. Often users find drag-and-drop intuitive and prefer it to other editing and manipulation methods.

Drag-and-drop also enable the user to drag elements from a different window or tab into ours, meaning they have more uses than regular file upload buttons.

In this recipe, we're going to make a drag-and-drop area for images. It will work both with dragged files and with images dragged from a different window or tab.

Note

More information about the HTML5 drag-and-drop specification can be found at http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html.

How to do it...

Let's write the code.

  1. We're going to create an HTML page with a drop area. To make the area easier to drop to, we're going to add some padding, margin, and border to it.

    <!DOCTYPE HTML>
    <html>
      <head>
        <title>File API example</title>
          <style type="text/css...
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HTML5 Data and Services Cookbook
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