on 05-10-2008 2:33 PM
Hi Experts,
I am new to webdynpro and i hope to get my basics right before i start working on it . Could someone plz answer the below queries:
1> What is a Node, Attribute and Element.
2> How does the data flow occur between Component Controller and other View Controllers.
3> What is the hierarchy of methods executed in a view i.e wddoinit,modifyview,afteraction etc.
Thanks In Advance,
Chaitanya.
1. Context is like a data container which holds the data. In this context you can create (sub)nodes and attributes. So a node can have a structure (attribute) like SFLIGHT. Meaning, in this node you can store data from DB table SFLIGHT. On the other hand, you can also create attributes (variable). A node can have a certain cardinality:
Each node contains data fields that represent one of the following:
An individual instance of an object type
A table of instances.
This property of a node is known as its cardinality. The following table summarizes the
possible cardinalities for a node:
Cardinality Description
1:1 The node contains only one element instance, which is instantiated automatically.
0:1 The node contains only one element instance, which must not be instantiated.
1:n The node can contain multiple element instances, of which at least one must always be
instantiated (and is instantiated automatically).
0:n The node can contain multiple element instances, of which none have to be instantiated.
2. The flow is achieved via context mapping. This is a drag and drop functionality in which you can drag and drop nodes, attributes from one context controller to the controller of the other context.
3. WDDOINIT, WDDOMODIFYVIEW, WDDOBEFOREACTION, WDDOEXIT..
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Hi ,
refer to these links
https://www.sdn.sap.com/irj/sdn/nw-ui?rid=/webcontent/uuid/00545e6d-0679-2910-acab-8073ce9a1659 [original link is broken]
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