Programming Windows 8 Apps with HTML CSS and JavaS

KraigBrockschmidtWindows®8AppsProgrammingwithHTML,CSS,andJavaScriptSECONDPREVIEWPUBLISHEDBYMicrosoftPressADivisionofMicrosoftCorporationOneMicrosoftWayRedmond,Washington98052-6399Copyright©2012MicrosoftCorporationAllrightsreserved.Nopartofthecontentsofthisbookmaybereproducedortransmittedinanyformorbyanymeanswithoutthewrittenpermissionofthepublisher.ISBN:978-0-7356-7261-1Thisdocumentsupportsapreliminaryreleaseofasoftwareproductthatmaybechangedsubstantiallypriortofinalcommercialrelease.ThisdocumentisprovidedforinformationalpurposesonlyandMicrosoftmakesnowarranties,eitherexpressorimplied,inthisdocument.Informationinthisdocument,includingURLandotherInternetwebsitereferences,issubjecttochangewithoutnotice.Theentireriskoftheuseortheresultsfromtheuseofthisdocumentremainswiththeuser.Unlessotherwisenoted,thecompanies,organizations,products,domainnames,e-mailaddresses,logos,people,places,andeventsdepictedinexampleshereinarefictitious.Noassociationwithanyrealcompany,organization,product,domainname,e-mailaddress,logo,person,place,oreventisintendedorshouldbeinferred.Complyingwithallapplicablecopyrightlawsistheresponsibilityoftheuser.Withoutlimitingtherightsundercopyright,nopartofthisdocumentmaybereproduced,storedinorintroducedintoaretrievalsystem,ortransmittedinanyformorbyanymeans(electronic,mechanical,photocopying,recording,orotherwise),orforanypurpose,withouttheexpresswrittenpermissionofMicrosoftCorporation.Microsoftandthetrademarkslistedat’sviewsandopinions.Theinformationcontainedinthisbookisprovidedwithoutanyexpress,statutory,orimpliedwarranties.Neithertheauthors,MicrosoftCorporation,noritsresellers,ordistributorswillbeheldliableforanydamagescausedorallegedtobecausedeitherdirectlyorindirectlybythisbook.Acquisitions,Developmental,andProjectEditor:DevonMusgraveCover:TwistCreative•SeattleIntroduction.......................................................................................................11WhoThisBookIsFor.................................................................................................................................................................12WhatYou'llNeed........................................................................................................................................................................13AFormattingNote......................................................................................................................................................................13Acknowledgements....................................................................................................................................................................13Errata&BookSupport..............................................................................................................................................................14WeWanttoHearfromYou.....................................................................................................................................................15StayinTouch................................................................................................................................................................................15Chapter1:TheLifeStoryofaWinRTApp:PlatformCharacteristicsofWindows8..........................................................16LeavingHome:OnboardingtotheStore............................................................................................................................17Discovery,Acquisition,andInstallation...............................................................................................................................20PlayinginYourOwnRoom:TheAppContainer..............................................................................................................23DifferentViewsofLife:ViewStatesandResolutionScaling.........................................................................................27ThoseCapabilitiesAgain:GettingtoDataandDevices.................................................................................................30TakingaBreak,GettingSomeRest:ProcessLifecycleManagement.........................................................................33RememberingYourself:AppStateandRoaming.............................................................................................................35ComingBackHome:UpdatesandNewOpportunities..................................................................................................39And,OhYes,ThenThere’sDesign.........................................................................................................................................40Chapter2:Quickstart........................................................................................42AReallyQuickQuickstart:TheBl