How to Developing Your First Web Dynpro Application.docx
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How to Developing Your First Web Dynpro Application.docx
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HowtoDevelopingYourFirstWebDynproApplication
DevelopingYourFirstWebDynproApplication
Inthefollowingtutorial,youareintroducedstepbysteptothebasicconceptsinvolvedinimplementinganelementaryWebDynproapplication.TheuserinterfaceforthisWebapplicationconsistsofonlytwoviewsandallowstheusertonavigatefromoneviewtotheother.Inthefirstview,theuserisabletoenterhisorhernameinaninputfieldandnavigatetothenextviewusingabutton.Thisnameisthenaddedtoatextfieldanddisplayedinthewelcomingtextinthesecondview.
Theuserinterfaceforthistutoriallooksasfollowing:
Objectives
Bytheendofthistutorial,youwillbeableto:
● CreateaDevelopmentComponent(DC)foraWebDynproapplicationanditsassociateddevelopmentobjectssuchasWebDynproComponent,viewsandcontrollers.
● Definenavigationbetweenviews
● Designabasicviewlayout
● Defineandmapyourcontexts.
Prerequisites
● AlocalinstanceofSAPNetWeaverDeveloperStudioisinstalledonyourdesktop
● YouhaveaccesstoSAPApplicationServerJava
Procedure
1. CreatingaWebDynproDC
2. CreatingaWebDynproapplication
3. Creatingthesecondview
4. Specifyingnavigation
5. CreatingtheControllerContext
6. MappingContexts
7. Creatingactionsandimplementingnavigation
8. Designingaviewlayout
9. DeployingandRunningyourapplication.
CreatingaWebDynproDevelopmentComponent(DC)
Tomanagelocaldevelopmentobjects,youneedaspecificDCprojectintheDeveloperStudio.AWebDynproDCservesasacontainerforWebDynpro-specificresourcesanddevelopmentobjectssuchasWebDynprocomponents,models,componentinterfaces,views,localdictionarydatatypes,mimes.Forthisreason,youwillusetheappropriatewizardtogenerateasuitableprojectstructureforthenewWebDynproapplication.
Prerequisites
YouhavelaunchedtheSAPNetWeaverDeveloperStudio.
Procedure
1.ToopentheWebDynproperspective,choose
Window
OpenPerspective
WebDynpro
.
2.Choose
File
New
WebDynproDevelopmentComponent
.TheNewDevelopmentComponentwizardappears.
3.ChooseaSoftwareComponentforyour DevelopmentComponent,forexample MyComponents, andconfirmwithNext.
4.Inthewindowthatappears,giveyourDCthenamewelcome,leavethedefaultsettingsunchangedandchooseFinish.
Result
ThewizardgeneratesaninitialstructureforyournewWebDynproDCasshownbelow.The WebDynproExplorerprovidesalogicalviewofthestructureofaWebDynproDC(asopposedtoapurefileandfolder-basedone).Withthisprojectview,youcanaccessallWebDynprounits.Inaddition,eachWebDynproDCprovidesaccesstolocaldictionaries,withthehelpofwhichyoucancreateuser-defineddictionarytypes.Additionallyrequiredprojectsresources,suchasMIMEsorevenseparateJavahelpclasses,canbeaddedtotheWebDynproDCthroughtheresourcesnode.
CreatingaWebDynproApplication
Theprojectstructureyouhavecreateddoesnotyetincludealltheelementsthatenableyoutodefinethespecificfunctionsofanapplication.TheseadditionalelementsareencapsulatedinaWebDynprocomponentthatcancontainanynumberofwindowsandviewsforvisualrepresentationandtheircorrespondingcontrollers.
Moreover,youalsoneedanobjectthatcanbeusedtoaddressanddisplaytheWebDynprocomponentintheWebbrowser.ThisiswhyyoucreateaWebDynproapplicationasanadditionalobject.AsanindependentprogramunititconnectstoanURLthatcanbeaccessedbytheuserwithawindowintheWebDynprocomponent.
Prerequisites
∙Thestructureofthe welcomeDevelopmentComponent(DC)youhavecreatediscurrentlydisplayedinthe WebDynproExplorer.
Procedure
1.Expandthe WebDynpro nodeinthestructureofthe welcomeDC.
2.Tostarttherelevantwizard,openthecontextmenuofthe Applications nodeandchoose CreateApplication.
3.EnteranameforyourWebDynproapplication,suchasWelcomeApp,andspecifythepackagename(suchascom.sap.demo.welcome.welcomeapp)fortheJavaclassesthatwillbegenerated.Thenchoose Next.
4.Inthewindowthatappears,youmustassignaWebDynprocomponenttowhichtheapplicationislinked.SinceaWebDynprocomponenthasnotyetbeencreated,thewizardcreatesacomponentatthispoint.
5.Accepttheselection Createanewcomponent andchoose Next again.
Inthenextscreen,youmustspecifysomegeneralvaluesforthecomponent.
6.EnterthenameWelcomeCompforyourWebDynprocomponentandspecifythepackagename(suchasp)fortheJavaclassestobegenerated.
7.Accepttheothersuggestedsettingsandchoose Next.
8.Acceptthepredefinedsettingsforthewindow,theinterfaceview,thestartupplugandthedefaultview,andchoose Finish.
Result
Theapplicationwizardperformsseveralgenerationroutines.Onceithasfinished,itaddsthenewapplicationobjecttothestructure,automaticallyopensthe Propertiesview(intherightpane).Additionally,itinsertsasubstructureforthenewWebDynprocomponent WelcomeComp,includingtheview WelcomeCompView.
Youcannowaccessallpartsoftheprojectusingthegraphicaleditorcalled ComponentModeler anduseitforconvenienttop-downnavigationthroughallofthelayersanddevelopmentobjects.
CreatingtheSecondView
Usersneedelementswithintheuserinterfacetointeractwiththeapplication.TheWebDynproconceptallowsyoutosplittheuserinterfaceintoanarrangementofviews.YoucanthinkofeachoftheseviewsasanentityencompassingtheelementsofaUIthatbelongtogether.
Nowyoucreateasecondviewtoprovideanapplicationthatprovidestwodifferentviewlayoutsprovidingdifferentinformation.YoudefinethelogicaluserinterfaceunitwithgraphicalsupportoftheWindoweditortool.Lateron,youwilldesignthelayoutitself.
Procedure
1.ToopentheWindoweditortool,double-clickonthewindowname WelcomeWindow withinWebDynproExplorer.
2.Clickonceon NewView inthepalettetool,thenonceintothegraphicaleditor.Entername ResultView forthenewviewandconfirmwith Finish.
Result
Whenyoudouble-click WelcomeWindow intheDCstructureyouwillfindtwoviewsdefinedfortheapplication.The WelcomeCompView isdisplayedwithaboldline,sinceitisthedefaultviewtobedisplayedwhentheapplicationisstarted.
SpecifyingtheNavigation
Aviewcanonlybedisplayedbythebrowserifithasbeenembeddedinawindow.Awindowalwayscontainsoneormoreviews,whichareconnectedbynavigationlinks.Oneoftheseviewsisspecifiedasthedefaultviewandisdisplayedthefirsttimewhenthewindowiscalledforthefirsttime.
Todefinethenavigationbetweentheviews,youmustcreateexitandentrypointsforeachviewusingoutboundandinboundplugs.Youcanthenspecifythenavigationflowusingnavigationlinks.Thenavigationthencanbetriggeredwithaspecialmethodthatisgeneratedforthispurpose.
Procedure
1.Tonavigatetothewindow,double-clickthecomponentWelcomeWindowintheWebDynproexplorer.Thegraphicaltooldisplaystworectanglesrepresentingtheviews.
2.Choose Link fromthePaletteanddrawalinefromthe WelcomeCompView tothe ResultView.
Result
∙Onthe WelcomeCompViewan Outbound plugcalled Out iscreated.
∙Onthe ResultView an Inbound plugcalled In iscreated.
∙AneventhandlerwiththenameonPlugInhasbeenautomaticallycreatedforthe ResultView.
CreatingtheControllerContext
EachWebDynprocomponentissuppliedwithacorrespondingcomponentcontroller.ItservesasaglobalcontrollerthatisvisiblewithintheWebDynprocomponentforallothercontrollers,especiallyfortheviewcontrollers.ThedatausedintheWebDynprocomponentorintheviewisstoredinthecontext.Read-writeaccesstothisdataisavailableusingthecontrollersasastartingpoint.
Procedure
Youstartbycreatingaglobaldatastoragespaceusingthecomponentcontext.
Creatingacontextforthecomponentcontroller
1.Tonavigatetothecomponentcontroller,double-clickonthecomponent WelcomeComp intheWebDynproExplorercomponentmodelerandthenclickon ComponentContoller inthecomponentmodeler.
Alternatively,youcannavigatetothenode
WebDynpro
Components
WelcomeComp,
andthendouble-clickthe ComponentController node.
2.Inthepropertiesview,choosethe Context tab.
3.Openthecontextmenufortherootnode Context andchoosetheoption
New
Node
andinthenextscreen Manually(sinceyouneedtocreatethecontextfromscratch).
4.EnteranamefortheNode,forexample userNode andconfirmwith Finish.
5.InthePropertiessectionofthecontexttab,settheCollectionCardinality1...n to .Thisisnecessarysuchthatatruntimeatleastonenodeelementiscreatedandthe InputFieldisenabledtoaccepttheuser'sinput.
6.Selectthe userNode,openthecontextmenuandchoose
New
Attribute
.
7.Selecttheoption Manually enterthename username andselect string asthetypeoftheattribute.Thenchoose Finish.Thevalueattributeisaddedtothecontextnode userNode.
MappingViewContextstotheComponentControllerContext
ToensuredataconsistencyinsideaWebDynproDC,thedataisstoredintheComponentController(orinaCustomcontroller)andthedifferentviewcontrollercontextsreferencetothisdata.Torealizethis,youhavetomaptherelevantcontexts.
Procedure
1. Gobacktothecomponentviewusingthegraphicaltooloralternativelyexpandthenode WebDynpro →Components → WelcomeComp.
2. Choose DataLink fromthePaletteanddrawalinefromthe WelcomeCompView tothe ComponentController.Inthewiza
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