Coupling between component controller and view controller

Hello,
I have seen some discussions in this forum regarding the possibilities of calling / triggering a view controllers's method from a component controller's method; obviously the Web Dynpro framework only provides for the other direction (view ctrl -> comp ctrl) via handle <i>wd_comp_controller</i>.
Some people proposed raising events in the comp controller and catching these in the view controller, others pointed out that any dependance of a view controller on a component controller would violate MVC principles.
Now, I can't see why a tighter coupling (in both ways) between controllers within one component would harm MVC in any way. So I suggest to "register" a view controller in the pertaining component controller if necessary:
this_controller = wd_this->wd_get_api( ).
wd_comp_controller->register_view_ctrl_XYZ( this_controller ).
This way the component controller can save the reference and later call any method on it. What do you think, does anything argue against this practice?
Regards,
Sebastian

Hi Sebastian,
I wouldn't try to explain whether it is violating the MVC principles or not.
Can you please explain how to call methods of view using the view controller?
have you tried using an example???
I want to give a small example which I think is a basic disadvantage of calling View methods from component controller.
Suppose I have 30 methods in a view and such 7 views in a component (I think this is a very common example).
Till now one is very clear that if I have a method in view, it will be called at maximum by other methods with in the view. That means at any point of time, my search is limited to 30 methods.
Now if component controller can also call my search will become horrible and spread to 210 methods, unless otherwise, you are very good at naming attributes and wont make the mistake of assigning attributes wrongly.
Imagine the effort if the outside components also access these methods through interface.
Also I dont think that the webdynpro phase model can support this way of calling view methods. You might be successful once, but then you are trying to open a can of worms.
This is my way of thinking...
Also, it would be great if you can tell me whether you are successful in calling views methods or not???
Thanks,
Anand

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https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/web%20dynpro%20sample%20applications%20and%20tutorials.htm
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hi,
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Re: Difference between Component Controller and Custom Controllet...?
Re: custom vs component controller
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https://www.sdn.sap.com/irj/sdn/downloaditem?rid=/webcontent/uuid/19e6e990-0201-0010-eca6-a62e342eaad3 [original link is broken]
https://www.sdn.sap.com/irj/sdn/downloaditem?rid=/webcontent/uuid/1208c2cd-0401-0010-4ab6-f4736074acc6 [original link is broken]
https://www.sdn.sap.com/irj/sdn/downloaditem?rid=/webcontent/uuid/1ee0e990-0201-0010-75bf-a087c241cb83 [original link is broken]
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Hi Sambaran,
I guess I understood what you want.
To achieve this, proceed as follows:
1)Open your View, goto Properties tab. Here in the Used controller table, click on the create icon to include the component controller (component controller is added by default by the framework, if you use custom controller you need to define this usage).
2)Once you do this, goto Context tab of the view, here now you will be able to see the component controller on the right hand side.
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Read a View Context's node's element and assign from Component controller

Hello Experts,
I'm new to JAVA WD.
Here is my scenario.
I have to use an Adobe form in a WDJ. The input parameters and the output parameters of the DC are defined in a method in the Interface Controller method.
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Then the mapping between the Component controller and the interface controller is done so that the Interface controller also has the context structure as
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---StartDate
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Now I bind the view also with the Component controller as below.
Context
---StartDate
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But since i need to use an Adobe interactive form inside this view, the datasource for the form cannot be the root context node but some other node. So I replicated the same structure in the view context so as to make the fields visible in the Adobe form context. Now the context looks as below.
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Please help!
Any help will be greatly appreciated.
Thanks,
Sam

Hello Nikhil,
I'm stuck with another small issue.
Let me first explain what I'm trying to do.
I have a view with the context structure as follows
Context
---DATA_NODE (Node)
----Data1
----Data2
---Data1
---Data2
All i need to do is, at the start of the view, i need to move the data from
Context.Data1=>Context.DATA_NODE.Data1 and
Context.Data2=>Context.DATA_NODE.Data2
Also, at the View Submit button click, I need to move the data from
Context.DATA_NODE.Data1 => Context.Data1 and
Context.DATA_NODE.Data2 => Context.Data2
(I managed to do this submit button click by calling an action->method and wrote the code as you gave earlier)
wdContext.currentContextElement().setData1(wdContext.currentData_NodeElement().getData1());
wdContext.currentContextElement().setData2(wdContext.currentData_NodeElement().getData2());
But I wrote at wdInit() for the view the code in the reverse way, but the values are not getting passed to the Data_Node and hence its not defaulting with the values from the elements of the context.
This is what I wrote.
wdContext.currentData_NodeElement().setData1(wdContext.currentContextElement().getData1());
wdContext.currentData_NodeElement().setData2(wdContext.currentContextElement().getData2());
Please let me know if I'm doing something wrong here.
Appreciate your help in advance!
Cheers,
Sam

Coupling between component controller and view controller

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