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Announcing a UI control catalog and this week's Control of the Week: Apple-style SlidingPagesWithDots

I think the web UX field would benefit from having access to an open, comprehensive catalog of working, ready-to-use user interface controls. All programming platforms provide class libraries replete with hundreds of base classes, which are both standard implementations and starting points for custom work — but when it comes to user interface libraries, most provide something like a dozen very basic controls: a Button, a ListBox, a SpinBox, a Slider, etc. There’s also always a DatePicker, and it usually represents the pinnacle of complexity for the UI library. That’s about it. Everything else — i.e., much of the UI components a design team needs — has to be custom made from scratch.

This is incredibly inefficient, and a state of affairs tolerated perhaps in no other branch of software development. Few people seem to realize that a solution is even possible. I think at least one key reason for that is that most UI frameworks don’t define the semantics of specialization (subclassing) by which one person can take another person’s component and specialize both the component’s appearance and behavior to their needs. With such semantics in hand, it should be possible to build a much richer ecosystem for UI components.

A core purpose for the QuickUI framework is to address exactly that need: let people build robust, solid, well-tested base controls that can get quickly specialized for particular needs. To prove that is possible, and to verify QuickUI can do that well, I’m starting a project to create a large library of UI control base classes. My plan to tackle (first on my own, and then hopefully with the help of some of you) as many of the common UI controls found around the web as possible. Many of these aren’t even recognized as shareable controls; they’re often referred to as “patterns”, suggesting there’s no common behavior which could be shared.

These controls will get collected into a catalog of live examples and ready-to-use source code. Each control in the catalog will be live code: not screen shots of examples, not a pattern, not a template for a prototyping tool, not a recipe for doing it yourself. Each one should be ready to use in your web app. Furthermore, each control should be able to serve as the starting point for your own custom refinements. As a side effect, the catalog should also be a useful reference for developers building UI in other ways, but the biggest benefits should accrue to people who can just pick up the working controls and start using them.

As a working format for the project, I’ve been inspired by the efforts of various artists to create a something-a-day for 365 days (e.g., Noah Scalin’s Skull a Day). I think a good control implementation might take longer than a day to code and write up. I think a control a week is a more reasonable goal.

So here’s my plan for Control of the Week:

  1. Each week I’ll pick a common control to implement (or improve) and discuss.
  2. I’ll code up a solution in QuickUI. Each implementation will generally focus on doing a single UI task really well.
  3. I’ll do my best to verify that the solution works as expected in the major browsers: Chrome, Firefox, IE 8+, and Safari. Visuals will be done in CSS3 whenever possible, so things might look different (clunkier) in IE8, but I’ll try to allow for graceful degradation.
  4. I’ll add an entry for the control to the QuickUI Catalog. The control’s notes may include suggestions on when and how to use the control in a UI. The Catalog already contains a number of controls ready to go. Some of those will be revisited and spiffed up as part of this project.
  5. I’ll post the control’s source code in the quickui-catalog repo on GitHub. From there the source could get copied into any web app project. For now, QuickUI is designed for use with an accompanying markup language, but they could fairly easily be invoked from regular JavaScript. I’ll be working on better documenting how to do that.
  6. I’ll blog about the control here. This will likely include a look at one or two examples of sites using the control, and any thoughts on how the control came out. Additional related controls (like RotatingPagesWithDots, below) may fall out of the week’s work, and as time allows I will write up some of those as well.

The project format and details will certainly evolve, but rather than plan that all out, I want to dive in and get started. So without further ado, here’s…

Control of the Week: Apple-Style SlidingPagesWithDots

SlidingPagesWithDots presents its content as a horizontal sequence of pages in which navigation between pages shows a sliding animation. The classic representation of this control is found in the iOS app launcher:

iPhone Standard Launch Screen

Key aspects

In a touch screen implementation like the one above, the user swipes left and right to navigate the pages. Apple’s store also uses this device in the “hero” element of a product page (e.g., the MacBook Air page) to rotate between product shots:

Apple Store Sliding Pages

Here the pages automatically rotate once through on a timer; the user can also click a dot to navigate to a specific page.


Since iOS doesn’t (yet) make swiping easy to implement, for the implementation I’ve focused on the Apple Store-style example. The control renders each child as a separate page, so their visual treatment and behavior is completely open. The dots can be replaced with custom controls. A subclass of SlidingPagesWithDots called RotatingPagesWithDots adds the Apple Store rotation behavior; the rotation interval can be customized.

As will likely become a common theme, getting this to work in Mozilla and WebKit was straightforward, and getting it to work in IE9 wasn’t too bad. Getting it to work in IE8 was an enormous pain that necessitated fixing some optimistic assumptions deep in the QuickUI framework. Furthermore, IE8's lack of border-radius support means that the circular “dots” will degrade to squares. This could be addressed by falling back to a sprited image on IE8, but as I’d already spent more time than I’d intended on IE8, I’ve punted on that for now.

Usage notes

This control seems useful for showing a small set of, say, 3-7 pages. The sliding animation is nice, but for high-frequency tasks could become annoying. The automatic rotation could be distracting in any situation where the user is forced to perform a task while the animation is playing. It seems more appropriate for, say, a site’s home page, where it could be used to temporarily highlight content in the hopes of showing something that interests the user.