Coding the UI

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    Coding the UI - Presentation Transcript

    1. Coding the UI: Lessons Learned from ebookers and Orbitz Mark Meeker AjaxWorld Architect, UI Engineering San Jose, California Orbitz Worldwide October 21, 2008
    2. UI Dozens of apps, hundreds of VMs, thousands of services.
    3. CSS JavaScript CSS 2.1 JSP XHTML 1.0 JSP 2.0 (page templating) webapp (controller layer)
    4. “As far as the customer is concerned, the interface is the product.” - Jef Raskin
    5. “Browsers are the most hostile software development environments possible.” - Douglas Crockford
    6. 1,971 Revisions to 1 .css file since Oct. 2006 2.9 edits per day (if working weekends)
    7. 2001 - Orbitz.com 2002 - OrbitzForBusiness.com 2005 - CheapTickets.com 2006 - mobile.orbitz.com 2007 - updates.orbitz.com 2008 - ebookers.com
    8. Experience Single JSP files measuring in thousands of lines Massive amounts of repeated markup 561 files with <html> tag Minimal re-use 66 tables on one page
    9. “Good judgement is the result of experience … Experience is the result of bad judgement.” —Fred Brooks
    10. Fresh start? http://flickr.com/photos/jeremybrooks/833157523/
    11. Wishlist Internationalization Universality Maintain High Quality Code Promote Code Re-Use Consistent Experience http://flickr.com/photos/litandmore/2664900676/
    12. Internationalization http://www.flickr.com/photos/nickjacksonza/256651959/
    13. 6:50pm versus 18:50
    14. 14/11/07 versus 11/14/07
    15. miles versus kilometers
    16. 3,000+ Labels, strings, paragraphs of text.
    17. Traveler vs. Traveller vs. Passengers
    18. 1,500+ Images
    19. Images Remove text as much as possible Consider cultural differences in images choices
    20. English
    21. French
    22. Japanese
    23. Translation Small words can expand 200-300% Rule of thumb: 40% Watch for wrapping issues (or lack thereof) Consider during design comp stage
    24. Universality
    25. Follow Web Standards
    26. Follow Web Standards P.O.S.H. plain old semantic HTML Constant balancing act Reduces display defects Reset Styles Validate CSS Reminder that it is an evolving code base
    27. IE6 Support <!--[if IE 6]> <style type=\"text/css\" media=\"all\"> @import url(/style/layout/layoutIE6Fix.css); </style> <![endif]-->
    28. Firefox 3, OSX
    29. IE 5.2, OSX
    30. Amazon Kindle
    31. Progressive Enhancement Content is KING! Start with semantic markup Get working functionality with HTML only Enhance display with CSS Enhance behavior with JavaScript
    32. Separation of Layers No in-line styles or in-line JavaScript If it only works with JavaScript, create it with JavaScript
    33. Graded Browser Support http://developer.yahoo.com/yui/articles/gbs/ Varying levels of support Isn’t required to be identical Not all or nothing
    34. Graded Browser Support A-Grade White-list (well-known, measurable market share) Tested by QA Team C-Grade Blacklist (incapable browsers, call drivers) X-Grade Everyone else
    35. Maintain High Quality http://www.flickr.com/photos/harvypascua/46114061
    36. High Quality Validation Build time tests (automated) static code analysis CSS validation JSP compile Constant developer vigilance Sometimes constraints are good
    37. Constraints Custom tags for some HTML elements anchors, images, form elements Only allow subset of attributes no: onclick, id required: various content Able to enforce all inputs have labels Free CSS and JS support Free shared functionality
    38. Debug Tools Logging Runtime in-application debugging Expose data to testers Debug various types of modules Content Error message placement
    39. File Structure Developer first Build for deploy later move files around combine them reformat them strip comments
    40. CSS Files Split between multiple files Typography Color Layout Modules Nav Each declaration on its own line
    41. Promote Re-Use (DRY) http://flickr.com/photos/kingdesmond/477389196
    42. Composite View Separates “layout” of page from content Allows to plug in different modules into page Used in Apache Tiles Leverage in-house framework Try and gain as much re-use of JSP code
    43. Layout Header Rail Body Footer
    44. Module
    45. Page Definition header.jsp --> Header results.jsp --> Body sortbar.jsp --> Rail footer.jsp --> Footer
    46. Page Composition B/E Page Browser Def Magic
    47. DRY Avoid targeting IDs for CSS or JS Custom attribute for JavaScript Data Separation of Layers Helper code for small “controls” with the CSS to go with them Take advantage of lazy developers
    48. Consistent Experience http://www.flickr.com/photos/kiad/491754035/
    49. Consistent Experience Make learning how to use the site easier for users. Reduce the number of patterns. Stick with the ones that work best. Meet users expectations on... messaging error placements interfaces
    50. Consistent Experience Review the site for common patterns Introduce a Pattern Library Build common “controls”
    51. Follow the 80/20 Rule
    52. “Simple things should be simple and complex things should be possible.” —Alan Kay
    53. 80/20 Rule Make it easy to do the the common task for 80% of your users Make it possible to do everything for the other 20% that need to
    54. Hide/Reveal
    55. Micro-content
    56. 80/20 Rule Patterns: Hide Reveal Tabs Pattern Pulling in content via Ajax “Micro-content” bubbles
    57. What’s Next? http://flickr.com/photos/reinvented/179863733/
    58. Questions? Slides: http://markmeeker.com/events/ajaxworld2008 Email: mark@markmeeker.com Blog: http://markmeeker.com Orbitz Jobs: http://www.orbitz.com/startmycareer

    + Mark MeekerMark Meeker, 2 years ago

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