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Summary - Part II: JavaScript for Programmers

Chapter 9: Unobtrusive JavaScript

What's Unobtrusive JavaScript

JavaScript applied to websites in a manner that increases user value, stays out of the user's way and enhances pages progressively in response to detected support.

Unobtrusive JavaScript guides us in our quest for truly clean code; code that either works, or knowingly doesn’t; code that behaves in any environment for any user.

9.1 The Goal of Unobtrusive JavaScript

advantages of this technique

  • Accessibility. Wider audience, better for screen readers and web crawlers. Better sense of content.
  • Flexibility. Refactoring, tunning.
  • Robustness. Progressive enhancement.
  • Performance. Caching scripts.
  • Extensibility. Separation of concerns. JS form the Markup

9.2 The Rules of Unobtrusive JavaScript

the 7 rules of unobtrusive JS

  • Do not make any assumptions
  • Find your hooks and relationships
  • Leave traversing to the experts
  • Understand browsers and users
  • Understand events
  • Play well with others
  • Work for the next developer

9.3 Do Not Make Assumptions

important considerations

  • Don't assume you are alone. Keep your global footprint small
  • Don't assume markup is correct. Markup can be changed over time by other scripts,
  • Don't assume all users are created equal. Use the Web Content Accessibility Guidelines (WCAG).
  • Don't assume support. Test for the existence of features before using them.

9.4 When Do the Rules Apply?

in the real world...

Like TDD, coding JavaScript unobtrusively will probably slow you down slightly as you start out, but you will reap the benefits over time because it makes maintenance a lot easier, causes fewer errors, and produces more accessible solutions. This translates to less time spent fixing bugs, less time spent handling complaints from users, and possibly also less serious trouble as accessibility laws get more comprehensive.

9.5 Unobtrusive Tabbed Panel Example

using the Tab Controller

Implementation here