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1、iTePub.Net-CollectIntroducingordertoAjaxThischaptercovers■DevelopingandmaintaininglargeAjaxclientcodebases■RefactoringAjaxJavaScriptcode■ExploringcommondesignpatternsusedinAjaxapplications■UsingModel-View-ControllerontheserversideofanAjaxapp■Overviewo
2、fthird-partyAjaxlibraries69LicensedtojonathanzhengiTePub.Net-Collect70CHAPTER3IntroducingordertoAjaxInchapter2,wecoveredallthebasictechnologiesthatmakeupanAjaxapplica-tion.Withwhatwe’velearnedsofar,it’spossibletobuildthatsuper-dupe
3、rAjax-poweredwebapplicationthatyou’vealwaysdreamedof.It’salsopossibletogetintoterribletroubleandendupwithatangleofcode,HTMLmarkup,andstyl-ingthatisimpossibletomaintainandthatmysteriouslystopsworkingoneday.Orworse,youendupwithanapplicationthatcontinues
4、toworksolongasyoudon’tbreathenearitormakeasuddenloudnoise.Tobeinsuchasituationonapersonalprojectcanbedisheartening.Tobeinsuchasituationwithanemployer’sorpayingcustomer’ssite—someonewhowantsafewtweakshereandthere—canbepositivelyfrightening.Fortunately,
5、thisproblemhasbeenendemicsincethedawnofcomputing—andprobablybeforethat!Peoplehavedevelopedwaystomanagecomplexityandtokeepincreasinglylargecodebasesinworkingorder.Inthischapter,we’llintro-ducethecoretoolsforkeepingontopofyourcode,allowingyoutowriteandr
6、ewriteyourAjaxapplicationtoyourcustomer’sheart’scontent,andstillgohomefromworkontime.AjaxrepresentsabreakfromtheprevioususeofDHTMLtechnologiesnotonlyinthewaythetechnologiesareputtogetherbutalsointhescaleatwhichtheyareused.We’redealingwithmuchmoreJavaS
7、criptthanaclassicwebappli-cationwould,andthecodewilloftenberesidentinthebrowserforamuchlongertime.Consequently,AjaxneedstomanagecomplexityinawaythatclassicDHTMLdoesn’t.Inthischapter,we’llgiveanoverviewofthetoolsandtechniquesthatcanhelpyoukeepyourcodec
8、lean.Thesetechniquesaremostuseful,inourexperience,whendevelopinglarge,complexAjaxapplications.Ifyouwanttowriteonlysim-pleAjaxapplications,thenwesuggestyouskipaheadtotheexample-drivenchapters,startingwithchapter9.Ifyoualreadyknowrefactoringandd
