tailieunhanh - Web Application Design Patterns- P10

Web Application Design Patterns- P10: This is the type of book you’ll want to read with your entire team and a fl ip chart because every page will produce a list of actionable changes for the applications you’re developing. Pawan Vora has produced an amazing catalogue of the essential patterns for designing today’s web-based applications. | 256 CHAPTER 8 Rich Internet Applications Flickr uses a carousel approach in their slideshow. Amazon presents items in the carousel horizontally with prominent buttons at each side. when users reach the end of the carousel disable the right arrow and when users revert to the first item disable the left arrow. Pagination cues may also be used to indicate that users have reached the first or last item in the set Figure . Additionally a partial image of the previous or next item in the carousel may be shown Figure . Related design patterns CAROUSELS use visual effects ANIMATIONS TRANSITIONS such as slide-left slide-right slide-up and slide-down to allow users to maintain visual context between items in the carousel. For linear carousels use PAGINATION indicators to show users location within the carousel see Chapter 6 . USABILITY ISSUES INHERENTWITH RIAS Like any other web application poorly designed RIAs can undermine usability and must be tested for usability. In fact there are a few inherent usability issues with RIAs designers must be aware of. These issues relate to the use of the back button and bookmarking or favorites functionality. The back button problem Users who are not used to RIA-style web applications may not be aware that it is possible for part of a page to update so when they see a piece of a web page Usability Issues Inherent with RIAs 257 FIGURE Yahoo Food uses left and right navigation arrows for browsing. Also because it uses a linear carousel it uses pagination-like indicators as dots to indicate which section the user is viewing. FIGURE Pandora shows partial images of previous and next songs to indicate the presence of additional carousel items. change they may think they have navigated to a new page. They may then try to click the browser s back button to return to the previous state of the application which takes them to the previous page in the browser s history instead of the previous state of the .

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