Dr. Dobb's Journal - May 2008 - (Page 34) d05much_p2as 3/13/08 9:53 AM Page 34 Core Technology MOJAX: MOBILE AJAX FRAMEWORK Listing One Loading, please wait init(); // Initiation application data this.animate(true); // Start animation pingzillow(); // Get property information this.animate(false); // Stop animation tags to specify the background color, padding, and other attributes. With a few quick changes to the style sheet, you can quickly change the look-and-feel of the application. Mojax Script Mojax provides an implementation of ECMAScript, not unlike ActionScript (Adobe) or JScript (Microsoft). Example 4 illustrates it being used for an initialization function. Another common use of scripting is within a tag. For example, when processing key events, you can opt to check whether a numeric key was pressed: if (event.isNumeric() == true) { } Listing Two The uses of script within Mojax are many and varied. For instance, you could embed a short script within a tag as follows to display a debug message to the development environment console when the user selects the right softkey: 10) debug(‘varx: ‘ + varx);"> Data Persistence The Cache is a globally accessible object that provides a means to persist data across invocations of a mobile application. The Cache object is a collection of properties, stored as name-values pairs. Properties of the Cache are set and retrieved using dot notation: Cache.address = "2114 Bigelow Ave"; The Cache is limited by available storage space on the device, so it’s important to be judicious in deciding what to cache. Also, caching is on a per moblet basis; that is, each moblet has its own Cache so there are no worries about one moblet overwriting another’s cached content. Preloading and Caching Mojax can preload images during application startup via the tag: 34 Dr. Dobb’s Journal l www.ddj.com l May 2008 http://www.scitools.com http://www.scitools.com http://www.ddj.com
Table of Contents Feed for the Digital Edition of Dr. Dobb's Journal - May 2008 Dr. Dobb's Journal - May 2008 Contents Friday Night Fish Fry Alia Vox Developer Diaries Software Development Goes to the Movies Cat: A Functional Stack-Based Little Language Mojax: Mobile Ajax Framework Kernel-Mode Databases Getting Better Search Results Effective Concurrency The Agile Edge Dr. Dobb's Journal - May 2008 Dr. Dobb's Journal - May 2008 - Dr. Dobb's Journal - May 2008 (Page Cover1) Dr. Dobb's Journal - May 2008 - Dr. Dobb's Journal - May 2008 (Page Cover2) Dr. Dobb's Journal - May 2008 - Dr. Dobb's Journal - May 2008 (Page 1) Dr. Dobb's Journal - May 2008 - Dr. Dobb's Journal - May 2008 (Page 2) Dr. Dobb's Journal - May 2008 - Dr. Dobb's Journal - May 2008 (Page 3) Dr. Dobb's Journal - May 2008 - Contents (Page 4) Dr. Dobb's Journal - May 2008 - Contents (Page 5) Dr. Dobb's Journal - May 2008 - Friday Night Fish Fry (Page 6) Dr. Dobb's Journal - May 2008 - Friday Night Fish Fry (Page 7) Dr. Dobb's Journal - May 2008 - Friday Night Fish Fry (Page 8) Dr. Dobb's Journal - May 2008 - Friday Night Fish Fry (Page 9) Dr. Dobb's Journal - May 2008 - Alia Vox (Page 10) Dr. Dobb's Journal - May 2008 - Alia Vox (Page 11) Dr. Dobb's Journal - May 2008 - Developer Diaries (Page 12) Dr. Dobb's Journal - May 2008 - Developer Diaries (Page 13) Dr. Dobb's Journal - May 2008 - Developer Diaries (Page 14) Dr. Dobb's Journal - May 2008 - Developer Diaries (Page 15) Dr. Dobb's Journal - May 2008 - Software Development Goes to the Movies (Page 16) Dr. Dobb's Journal - May 2008 - Software Development Goes to the Movies (Page 17) Dr. Dobb's Journal - May 2008 - Software Development Goes to the Movies (Page 18) Dr. Dobb's Journal - May 2008 - Software Development Goes to the Movies (Page 19) Dr. Dobb's Journal - May 2008 - Software Development Goes to the Movies (Page 20) Dr. Dobb's Journal - May 2008 - Software Development Goes to the Movies (Page 21) Dr. Dobb's Journal - May 2008 - Cat: A Functional Stack-Based Little Language (Page 22) Dr. Dobb's Journal - May 2008 - Cat: A Functional Stack-Based Little Language (Page 23) Dr. Dobb's Journal - May 2008 - Cat: A Functional Stack-Based Little Language (Page 24) Dr. Dobb's Journal - May 2008 - Cat: A Functional Stack-Based Little Language (Page 25) Dr. Dobb's Journal - May 2008 - Cat: A Functional Stack-Based Little Language (Page 26) Dr. Dobb's Journal - May 2008 - Cat: A Functional Stack-Based Little Language (Page 27) Dr. Dobb's Journal - May 2008 - Cat: A Functional Stack-Based Little Language (Page 28) Dr. Dobb's Journal - May 2008 - Cat: A Functional Stack-Based Little Language (Page 29) Dr. Dobb's Journal - May 2008 - Mojax: Mobile Ajax Framework (Page 30) Dr. Dobb's Journal - May 2008 - Mojax: Mobile Ajax Framework (Page 31) Dr. Dobb's Journal - May 2008 - Mojax: Mobile Ajax Framework (Page 32) Dr. Dobb's Journal - May 2008 - Mojax: Mobile Ajax Framework (Page 33) Dr. Dobb's Journal - May 2008 - Mojax: Mobile Ajax Framework (Page 34) Dr. Dobb's Journal - May 2008 - Mojax: Mobile Ajax Framework (Page 35) Dr. Dobb's Journal - May 2008 - Mojax: Mobile Ajax Framework (Page 36) Dr. Dobb's Journal - May 2008 - Mojax: Mobile Ajax Framework (Page 37) Dr. Dobb's Journal - May 2008 - Kernel-Mode Databases (Page 38) Dr. Dobb's Journal - May 2008 - Kernel-Mode Databases (Page 39) Dr. Dobb's Journal - May 2008 - Kernel-Mode Databases (Page 40) Dr. Dobb's Journal - May 2008 - Kernel-Mode Databases (Page 41) Dr. Dobb's Journal - May 2008 - Kernel-Mode Databases (Page 42) Dr. Dobb's Journal - May 2008 - Kernel-Mode Databases (Page 43) Dr. Dobb's Journal - May 2008 - Getting Better Search Results (Page 44) Dr. Dobb's Journal - May 2008 - Getting Better Search Results (Page 45) Dr. Dobb's Journal - May 2008 - Getting Better Search Results (Page 46) Dr. Dobb's Journal - May 2008 - Getting Better Search Results (Page 47) Dr. Dobb's Journal - May 2008 - Getting Better Search Results (Page 48) Dr. Dobb's Journal - May 2008 - Effective Concurrency (Page 49) Dr. Dobb's Journal - May 2008 - Effective Concurrency (Page 50) Dr. Dobb's Journal - May 2008 - Effective Concurrency (Page 51) Dr. Dobb's Journal - May 2008 - The Agile Edge (Page 52) Dr. Dobb's Journal - May 2008 - The Agile Edge (Page 53) Dr. Dobb's Journal - May 2008 - The Agile Edge (Page 54) Dr. Dobb's Journal - May 2008 - The Agile Edge (Page 55) Dr. Dobb's Journal - May 2008 - The Agile Edge (Page 56) Dr. Dobb's Journal - May 2008 - The Agile Edge (Page Cover3) Dr. Dobb's Journal - May 2008 - The Agile Edge (Page Cover4)
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