HTML5: Drag and Drop in Depth
Illustration by John Hersey

Exploring the RPS CSS


From:

HTML5: Drag and Drop in Depth

with Bill Weinman

Video: Exploring the RPS CSS

The Rock, Paper, Scissors application uses a small amount of CSS3 for some very effective effects. First of all, let's just take a look at some of the basic formatting that's done and you'll notice here in the RPS.html I'm just going to scroll quickly all the way down to the bottom. We have this outer div called columns and here in rps.css we use that for its descendent selectors, so the div that are inside of columns and the footer that inside of columns get these formats and this is really quite simple.

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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

Exploring the RPS CSS

The Rock, Paper, Scissors application uses a small amount of CSS3 for some very effective effects. First of all, let's just take a look at some of the basic formatting that's done and you'll notice here in the RPS.html I'm just going to scroll quickly all the way down to the bottom. We have this outer div called columns and here in rps.css we use that for its descendent selectors, so the div that are inside of columns and the footer that inside of columns get these formats and this is really quite simple.

Each of the divs has a margin right of 20 pixels and it has a white solid border and so if we look at this in the browser you see that by having them float left they create columns. You see they have 20 pixels in between and that's the right margin and you notice that their footers are formatted with this bold font, and the white border of course you cannot see because it against a white background. But this sets it up for some of the magic that happens later. You'll also notice we have these transitions. Because this is CSS3 and it's not a finalized yet, we have these temporary selectors, that -webKit, -moz, -O.

-webKit works for Google Chrome and also for Apple Safari, -moz works for Mozilla Firefox and -O works for Opera, which doesn't support HTML5 drag and drop anyway. But we've included it here just so it's there for the future. And so by setting these transitions to transform with a .2 second ease out, when I set the class to moving, these things will happen with an animated effect. And so what is this? It's scaling by 80% and it's setting the opacity to a quarter.

And so when I look at this, when I grab this rock, what happens is that the animation happens, you see it's a gradual transformation, it shrinks and it grows gradually and it sets its opacity. And if we look over here at the JavaScript and my event handler for the DragStart, you see that I set the class name to moving and here in the CSS that's this selector right there.

So by invoking that selector, this transformation happens with a .2 second ease out and these are the things that are changes. It changes the scale and it changes the opacity. It's when I grab that that's what happens and it happens with nice cool animation. And likewise when I go and do the swap or even just drop it, that animation happens coming back and that happens in the dragEnd. The class name get set to undefined and when that happens, then this moving is no longer in effect and the default size and the default opacity comes back into effect and these transformations happen with the .2 seconds and so we get the nice bounce-back occurs.

So this demonstrates nicely just how much mileage you can get out of a few simple CSS effects. This simple Rock, Paper, Scissors application is a good example of how you can implement the HTML5 drag and drop with a few simple effects to create a compelling application. Again, feel free to use this code as a starting point for your own applications.

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