Please go thr' the link....
http://help.sap.com/saphelp_nw04s/helpdata/en/9b/c51c42735b5133e10000000a155106/frameset.htm
ABAP Dictionary Search Help
In Web Dynpro ABAP, you can reuse existing search helps from the ABAP Dictionary
When ABAP Dictionary search helps are reused, there are situations in which you want a search help exit to behave differently
in the Web Dynpro environment than in the classical dynpro. For example, in the Web Dynpro environment it is not possible to
process a separate dialog using CALL SCREEN.
Link: http://help.sap.com/saphelp_nw04s/helpdata/en/9b/c51c42735b5133e10000000a155106/frameset.htm
OVS Input Help
The maximum scope of Dictionary Search a search help is to the structure to which it is related.
There are situations where this technique is not sufficient.
e.g.Sometimes different input fields are related to diff value nodes which in turn refer to different ABAP dictionary
structures. In this case OVS (Object Value Selector).
Provides advanced search functionality
(Re-)use of component WDR_OVS – as search help view
Requires that the developer writes some specific coding
uniform look an feel for all search helps
The Event OVS has 4 phases, each is called once
CO_PHASE_0 for configuration of the OVS
CO_PHASE_1 for definition selection fields and default values
CO_PHASE_2 for retrieval of the result table
CO_PHASE_3 for receiving the selection
The different Phases can be recognized with the attribute OVS_CALLBACK_OBJECT->PHASE_INDICATOR
Freely Programmed Input Help
Please refer above link. In addition, to value helps mentioned above,devloper can define a completetly user defined value
help. It is implemented as a WD component implementing WD component interface IWD_VALUE_HELP.
Achyut
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