Few basic ques on Web Dynpro

Hi All,
I have few ques on Web Dynpro basics.
1. Why is Web Dynpro said to have language-neutral metamodel.
2. What is meta-model.
3. What is declarative programming approach.
4. Why is a dictionary used. The simple type and a structure can also be declared in a Controller. Is it just a Global Declaration.
5. Where does the code of dictionary reside.
Shall be grateful for the answers.
Regards
Nikhil Bansal

Hi Nikhil
Here is the answers for your questions.
1.Why is Web Dynpro said to have language-neutral metamodel
A.the user interfaces developed in webdynpro is platform independent because of meta model/data generated by webdynpro framework is independent of all languages.This metamodel you can transfer to any system so that the application is executed in that system.So generated meta data is independent.
2.What is meta-model.
Metamodel is data about the application.Webdynpro framework have seperate tools to generate this metadata in xml files.These files contains all information about your application.Views,components,actions every thing.
Metadata/model means data about the data in general
3.What is declarative programming approach
Declarative approach is the one with out coding most of the things required to implement User interfaces (design,appearence,data) are specifying at design time by choosing right properties.So this eliminates most of the coding.So this is the declarative model.
4.Dictionary
This is again having two types like simple and structure,Here basically we store the data in dictionary datatype or populate the data in this type in runtime.Usually this datatypes are used to display the data in dropdown box or to display large data.
5>Where does the code of dictionary reside
The Dictionart classes are generated by the frame work for simple type,For complex type the data you are populating in view controlleres depending upon the conditions
For clear classification
www.help.sap.com
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/webcontent/uuid/28113de9-0601-0010-71a3-c87806865f26?rid=/webcontent/uuid/8921447c-0501-0010-07b4-83bd39ffc7be [original link is broken]
https://www.sdn.sap.com/irj/sdn/developerareas/webdynpro
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/webcontent/uuid/28113de9-0601-0010-71a3-c87806865f26?rid=/library/uuid/49f2ea90-0201-0010-ce8e-de18b94aee2d [original link is broken]
Web DynPro Help
Reading Material on Web Dynpro
http://help.sap.com/saphelp_nw04/helpdata/en/5c/1b76bc3da0504e8b535cf3e154eaa7/content.htm
/thread/396968 [original link is broken]
regards
kalyan

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Web DynPro for ABAP Basics

Hello Seniors,
I am new to Web DynPro for ABAP. Could you please give me some information or send some basic documents for Web DynPro for ABAP. Please send some basic scenarios also.
Thank you,
Chaitanya.C.N

Hi Chaitanya,
Here is some information about Webdynpro for ABAP.
1) This is basic Info of WD ABAP
As the name suggests Web Dynpro for ABAP uses exactly the same meta model as its cousin Web Dynpro for Java. A Web Dynpro component, a Web Dynpro view, a Web Dynpro model, a Web Dynpro controller have the same semantics both for ABAP and Java. The main difference is the designtime environment, the development infrastructure and the runtime environment.
The designtime environment is properly embedded in the ABAP Workbench where Web Dynpro artifacts are simply a new category like BSP applications or classical dynpro based applications before. Also no surprises regarding the development infrastructure. The correction and transport system keeps track on all changes that are done, versions them and helps to propagate the Web Dynpro application from development to production like you would do with ordinary BSP or dynpro-based applications.
Last not least the execution platform is the ABAP server that produces application content ready to be integrated in the NetWeaver Portal seamlessly. Features like portal eventing can be used between applications written in ABAP or applications developed with Java.
2 ) I can give you links that can help you a lot.
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Create some compenents with BAPI , Component usage and ALV .
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/02e1fa45-0801-0010-10a0-f1cf47e8c943
/people/marilyn.pratt/blog/2005/12/20/web-dynpro-for-abap
Try to Download demo tutorials from SDN library & Try to search WebDynpro ABAP WebLogs .
Also, SAP has provided you with ample demo example of WD ABAP already bundled with SAP . Just Try out Components starting with WDR . I can tell you few like WDR_TEST_EVENTS ( It shows how every UI elments to use )
See packages like SWDP_DEMO , SALV_WD_DEMO
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We can call BAPI through a service call in web dynpro application. Thus automatically backgroud code for BAPI execution will be generated.
To start with Web dynpro ABAP you can try following tutorial:
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/a282c952-0801-0010-1eb5-87953e036712
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http://help.sap.com/saphelp_erp2005/helpdata/en/a5/1a1e3e7181b60ae10000000a114084/frameset.htm
best tutorials in wbdynpro for ABAP to start with :
https://www.sdn.sap.com/irj/sdn/developerareas/webdynpro?rid=/webcontent/uuid/fed073e5-0901-0010-4eb4-c9882aac7b11 [original link is broken] [original link is broken]
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https://wiki.sdn.sap.com/wiki/display/WDABAP/Main
Also you can search weblogs on web dynpro ABAP.
http://help.sap.com/saphelp_nw2004s/helpdata/en/45/19bf8c16f25d7ae10000000a11466f/frameset.htm
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/02e1fa45-0801-0010-10a0-f1cf47e8c943
/people/marilyn.pratt/blog/2005/12/20/web-dynpro-for-abap
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/02e1fa45-0801-0010-10a0-f1cf47e8c943
http://help.sap.com/saphelp_nw04s/helpdata/en/77/3545415ea6f523e10000000a155106/frameset.htm
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/wdabap/main&
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/a282c952-0801-0010-1eb5-87953e036712
You can start with tutorials and all. There are around six tutorials in SDN library.
Web Dynpro for ABAP
http://help.sap.com/saphelp_erp2005/helpdata/en/a5/1a1e3e7181b60ae10000000a114084/frameset.htm
best tutorials in wbdynpro for ABAP to start with :
https://www.sdn.sap.com/irj/sdn/developerareas/webdynpro?rid=/webcontent/uuid/fed073e5-0901-0010-4eb4-c9882aac7b11 [original link is broken] [original link is broken]
http://www.****************/Tutorials/WebDynproABAP/TextRadioButton/page1.htm
reward points for helpful answers.
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Raghava Vakada.

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Hi
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regards
Mrinalini.

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URGENT: Strange behaviour by Web Dynpro applications

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P.S :- Close the thread if you feel answers are satisfactory.

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Error in basic web dynpro application

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The requested URL could not be retrieved
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Hi
1.Go to Transaction RZ10
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2) What is Web AS?? what does it serve?
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I just want to understand the hardware systtem achitecture and associated software to be installed.
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Hi Ralph, I will try to keep it simple.

1) What is Sap NetWeaver? Does it comes with several components?

SAP Netweaver is the platform in which all SAP software runs on top of. For example R/3 ran on the "Basis" layer, this is simular in ECC6.0, where ECC is the R/3 part and Netweaver(ABAP stack) is the "Basis" Layer. With Netweaver you get two stacks, ABAP and Java. SAP components run on one or the other. Netweaver includes, but is not limited to:
Netweaver Application Server(formerly called WebAS)
Netweaver Portal(formerly called EP)
Netweaver XI(I think there is a new name for this)
etc.

2) What is Web AS?? what does it serve?

WebAS is now called Netweaver Application Server, this is the basis for all applications, whether ABAP or java based. For example the ECC(R/3 component) runs on the ABAP stack of Netweaver Application Server, the Netweaver Portal runs on the Java stack of NW Application Server.

3) I heard about Web Dynpro for Java and Web Dynpro for Abap. They are used to develop Web applications in Java language and the other in Abap language. I'm interested just on knowing the Java side.

For the java side, you develop the webdynpro applications locally on your laptop using NWDS(Netweaver Developer Studio) and then deploy this application to the Netweaver Application Server(java stack). You can then implement the application into an iView in the NW Portal.
http://help.sap.com/saphelp_nw2004s/helpdata/en/15/0d4f21c17c8044af4868130e9fea07/frameset.htm

I just want to understand the hardware systtem achitecture and associated software to be installed.
Now for Java, I heard that we need to install Web Developper Studio, rite?? then which version should I install, Sap Netweaver SP16 or Sap Neweaver 2004 or Sap Netweaver 2004s?? where can i find it?? should it be installed in front end station? do i need Java?
Now for Web AS, where do i install it??

Which NWDS to install depends on the version of the java engine in which you are working with. The rule is that you keep the version of NWDS in sync with the version of the Netweaver Application Server(java engine). Usually the NW AS, is intalled on a standalone server(not your laptop), but you can install sneak preview editions on your laptop for testing .
I hope this helps a little.
Regards,
Rich Heilman

Few basic ques on Web Dynpro

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