bsp:parameter with syntax check?

Question

I use subcontrollers pretty often in my application.
I usually pass parameters to my subcontrollers like this:
<bsp:call url = "blabla.do" comp_id = "id1">
    <bsp:parameter name = "my_attribute" value = "<%= lv_bla %>" />       
</bsp:call>
By this, the public attribute "my_attribute" of the controller class of blabla.do is set to the value of lv_bla. This works perfectly.
However, what if there is no such an attribute in the controller class or if I rename the attribute. Of course, the syntax checker would not recognize this.
I was thinking of adding a dummy-statement to the bsp:call that would detect the syntax error
<% IF controller->my_attribute IS INITIAL.ENDIF.%>
However, obviously, my_attribute is not in the controller, but in the subcontroller class. Can I also access the subcontroller? Or are there other ways to check if my_attribute exists in the subcontroller class?

Answer 1

hi,
One way to access a subcontroller class is to instantiate it using create object but in this case the instance of it will not be the same one in its parent controller.
another way in a controller class there is an attribute M_SUBCONTROLLERS of type BSP_CONTROLLER_LIST  which contains Tables with Instances of Subcontrollers (it is protected type). so we can make our own attribute (public) in controller of same type and inside our controller we just fill our attribute with values from this one. this way it will be ascessible outside also.
one more way is we just instatiate the subcontroller in our application class instead of instantiating in controller this way the same instance of the same subcontroller will be accessible and we can check for a attribute existance in it.
hope this may help you,
cheers,
Hemendra