ajax in action the enhanced ajax web portal

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1、iTePub.Net-CollectTheenhancedAjaxwebportalThischaptercovers■ConstructinganAjaxportal■Implementingaloginframework■Creatingdynamicwindows■Rememberingwindowstate■Adaptinglibrarycode423LicensedtojonathanzhengiTePub.Net-Collect424CHAPTER11TheenhancedAjaxwebportalMorea

2、ndmorecompanieshavebeenadoptingaportal-basedintranet.Portalsgiveusersaneasygatewayforobtaininglargequantitiesofinformationononepage.Thiseliminatestheneedfortheusertogotomultiplelocationstogettheinformationtheyneed.OnlineportalssuchasYahoo!allowustoobtainnews,weather,sportsscores,mai

3、l,games,andsomuchmoreonjustonepage.AnotherportalisAmazon’sA9.comsearchportal,whichletsusdosearchesonmultipleareaswithoutgoingtoseparatepages.Wecansearchforwebpages,books,images,andmuchmoreononepage.A9.comutilizesAjaxtodisplaytheinformationonthescreen.Thisallowsforagreatuserexperienc

4、esincetheuserdoesnothavetositandwaitforpagere-renderingwhennewsearchresultsaredisplayed.Inthischapter,weareincorporatingAjaxintoaportaltoimprovetheuser’sexperience:specifically,howhelogsintothesystemandhowthesystemremem-bershisdetails.Theportalprojectwillallowtheusertocustomizethela

5、youtoftheportalwithaminimumamountofeffort.Theuserwillnotevenrealizethathisactionsaresendinginformationbacktotheservertoremembertheexactlocationoftheobjectsonthepage.Thismeansthathispersonalsettingsarethesameeverytimehelogsintothesystem.Wefirsttakealow-levelapproachtobuildingtheporta

6、l.Weimplementabasicportalframeworkinaless-structuredmannertoshedlightontheconceptbehindtheportal.Wethenlookattheportalinamoreadvancedlightusinganobject-orientedapproach.Beforeweimple-menttheportal,let’sexaminesomecurrentportalsandseehowaddingAjaxcanimprovetheuser’sexperience.11.1The

7、evolvingportalOvertime,portalshaveevolvedfromsimplesitesthatletuscheckourmailanddoasearchtoelaboratesetupsthatallowustoobtainalargeamountofinforma-tioninlittletimeandwithlittleeffort.Bycomparison,inthepastwehadtocheckonesitefornews,anotherforweather,anotherforcomics,anotherforasearc

8、h,andsoon.Eitherweh