if_wd_context_node&if_wd_context_element

[Former Member]

Hi all,

I am a beginner of WDA, I am following some guides to build an easy WDA application.

I noticed that some tutorials use if_wd_context_element.

But in ATTRIBUTE tab of VIEW, you cannot find if_wd_context_element but if_wd_context_node.

And if_wd_context_node also has the methods like GET_ATTRIBUTE.

I have tried both and both of the two objects work correctly.

My question is:

Is this if_wd_context_element used for the old version of WDA and it may be not used now?

[Former Member · Accepted solution]

In case of a Node with only one Element, it doesn't matter which class (node/element) you're using, but if you have a node with 0..n elements, you have to get the specific element.

I take always the element class, because it's something "clearer" than using the node class.

[Former Member · Accepted solution]

I have tried this and it is like what you said.

BTW, can you tell me where I can find if_wd_context_element.?

It should be defined somewhere in the web dynpro component.

[ramakrishnappa · Accepted solution]

Hi Ming,

If_wd_context_element is no where defined in component but its an interface used at runtime to read the context element reference of context node and is also used to get node's attributes.

Comparison:

Context node: is like table

Context element: is like a row/record in it

Attribute : is like a field

A context node can have as many as context elements inside it.

DD:   From table ---> you get many rows/records  ---> from each work area you can access fields

WD : From context node ----> you get the context elements ---> from each context element you can access attributes

Please refer to my answer in the below link

Hope this helps you in understanding concept.

Regards,

Rama

[Former Member · Accepted solution]

Thank you.

I think I got it.

If_wd_context_element is a globally defined interface.

And so is If_wd_context_node.

wd_context is just ref to If_wd_context_node.

[ramakrishnappa · Accepted solution]

Hi Ming,

Please close the discussion by marking replies as correct / helpful answers if those helped you in understanding concept.

Regards,

Rama

[Former Member · Accepted solution]

OK, I will.

Thank you for your remind.

[rajeshkothamasu]

Hi,

follow below links

http://scn.sap.com/thread/763892

http://help.sap.com/saphelp_nw70ehp2/helpdata/en/32/bf5b4150b38147e10000000a1550b0/content.htm

http://help.sap.com/saphelp_nw04s/helpdata/en/fd/be5b4150b38147e10000000a1550b0/content.htm

Hope it will help you    

Regards,

Rajesh K

[Former Member]

The context is as the picture showed, and it seems I can use both if_wd_context_element but if_wd_context_node to get the ATTR1.