Creating a BSP using the Model View Controller Tut1

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Category: WAS / ITS

Published on Tuesday, 10 June 2008 19:27

Written by Anon.

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Tutorial 1 - Creating the View & the controller 
(htm page & events) 


Step 1 - Create new BSP Application
Using SE80 create BSP Application (I.e. Zbsp_usingmvc).

Step 2 - Create new Controller (main.do)
Right click on BSP application name and select 
create->controller. 

Enter name main.do or your own name + description. 

Press the green tick to continue



Step 3 – Populate controller class (zcl_controller_01)
Enter the name of your controller class i.e. zcl_controller_01. 

We also need to create this class so double click on the name. 

Yes.



Step 4 – Creating controller class
Once you have double clicked on the controller class 
name and pressed yes you will need to check the
properties tab and ensure its super class is 
CL_BSP_CONTROLLER2



Step 5 – Redefine Methods
You will have inherited a number of methods from the superclass. 

As these methods work in much the same way as events do within 
classic BSPs and ABAP you will now need to redefine a number of 
these ethods. 

These are DO_INIT and DO_REQUEST



Step 6 – Redefine DO_INIT
Ensure you have this method available for change by 
pressing the pencil button. Place your cursor on the 
method called DO_INIT and press the redefine button.

For this current example you dont have to do anything 
in this method but for a follow on exercise
you will be creating the MODEL instance in the 
DO_INIT method.


Step 7 – Redefine DO_REQUEST
(call a layout of type VIEW)
Ensure you have this method available for change 
(done in previous step). 

Place your cursor on the method called DO_REQUEST 
and press the redefine button. 

In the DO_request we will call a layout(View). We 
create a reference variable referencing the page 
and then call the method create_view and pass 
it the actual view (not yet created). We then call 
the view. Enter the
following code:

* Create reference variable from the interface if_bsp_page
  DATA: r_view TYPE REF TO if_bsp_page.

* Create object r_view with view_name main1.htm
* Layout is provided by view main1.htm
  r_view = create_view( view_name = 'main1.htm' ).

* Process view-> response is set accordingly
  call_view( r_view ).


Step 8 – Create BSP Page (View)
Right click the BSP Application and create a new 
page called main1.htm. When this is done
make sure you save and activate it.



Step 9 – Activate whole BSP Application


Step 10 – Execute
Go to the controller main.do and double click. 

Use the test(execute) button to view the results.

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