Instructor: Steffen Meschkat (Google)

Keeping the Web in Web 2.0Designing user interaction for web applications

2

Ajax applications

– Advantages:▫ Sophisticated UI, interactive and visual quality of

desktop applications

– Disadvantages:▫ Browser history and bookmarks of classic web

applications are broken if not implemented specifically.

3

Classes of interaction state elements

– Hard state:▫ Change creates history entry▫ E.g.: search in google maps (http://maps.google.be)

– Soft state:▫ Change is recorded in history, but doesn’t create a new entry▫ E.g.: panning in google maps (http://maps.google.be)

– Transient state:▫ Not recorded in history▫ E.g.: chatbox in google docs (http://docs.google.com)

– External state:▫ Not recorded in history, but recorded elsewhere▫ E.g.: messages in gmail (http://mail.google.com)