HTML5: Drag and Drop in Depth
Illustration by John Hersey

The JavaScript library


From:

HTML5: Drag and Drop in Depth

with Bill Weinman

Video: The JavaScript library

The exercise files for this course includes a small JavaScript library called bwH5.js. This is used in a number of my HTML5 application technology courses to keep the examples simple and uncluttered, to better focus on the topic you're learning. Let's take a look at it. I'm going to open this in my editor here. You'll notice at the top there is a version number and that's really just for my own internal reference. You should always use the version that came with the course that you're working on.

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Watch the Online Video Course HTML5: Drag and Drop in Depth
1h 0m Intermediate Jul 26, 2011

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Join Bill Weinman as he shows how to make just about any web page element draggable with a combination of JavaScript and HTML5, a technique that has increased browser support and that eliminates the need for external libraries such as jQuery. The course covers how to detect drag-and-drop support in the user's browser, code a simple event listener, use a drop zone, and even receive dropped objects without a drop zone. A simple working example game, a practical implementation of drag-and-drop that can be applied to almost any web site, is also demonstrated.

Topics include:
  • Exploring the HTML/Javascript/CSS/DOM relationship
  • Detecting drag and drop support
  • Using the HTML5 draggable and dropzone attributes and onDragStart event
  • Exploring different events
  • Receiving drops with or without a drop zone
  • Creating a simple game
Subjects:
Developer Web
Software:
HTML
Author:
Bill Weinman

The JavaScript library

The exercise files for this course includes a small JavaScript library called bwH5.js. This is used in a number of my HTML5 application technology courses to keep the examples simple and uncluttered, to better focus on the topic you're learning. Let's take a look at it. I'm going to open this in my editor here. You'll notice at the top there is a version number and that's really just for my own internal reference. You should always use the version that came with the course that you're working on.

You do not need to use the latest version of this library. The element variable points to an anonymous function which is simply a shortcut for the document.getElementById method and there is a few functions for testing if certain HTML5 application technologies are available. Display error and status message are for displaying certain types of messages on HTML5 pages and the bwTable class is for creating objects that manipulate tables.

This is not actually used in this course, but it is used in a number of my other courses for displaying and manipulating and working with tabular information. I'm scrolling through this slowly so you have an opportunity to copy it down if you need to do that and as always, with any of my code, feel free to copy this library and modify it for your own use in your own projects.

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