When the user Clicks the Modify button remaining Buttons should be dispayed

Hi experts,
In my application I have 3 fields and three buttons(Modify ,save and cancel)...The 3rd field is DATE field ...i have to display only MODIFY..and the remaining 2 buttons should be disable mode at Runtime.
1) when the user clicks the MODIFY button....then only other two buttons should be visible in my current application.
2) when the user clicks the SAVE button....the 3rd field should displayed with current date or System date.
3)whenever the user modify the details using modify button...meanwhile if the user clicks the cancel button...all three fields goes to Read only mode...
Thanks In advance for all.
how can i write the logic for all these 3 requirements...can anybody plz help me...
Regards,
Praveena..
Edited by: s.praveena on Jun 14, 2010 7:36 PM
Edited by: s.praveena on Jun 14, 2010 7:39 PM
Edited by: s.praveena on Jun 14, 2010 8:01 PM

Basically you want to handl the visibility and read-only properties of the UI elements at runtime.
To handle visibility property create a context attribute of type WDUI_VISIBILITY and bind it with the UI element's visible property.
in MODIFY action handler set this context attribute to IF_WDL_CORE=>VISIBILITY_VISIBLE to make it visible
IF_WDL_CORE=>VISIBILITY_NONE to make it invisible.
Similarly to handle the read-only behaviour, create the context attribute of type WDY_BOOLEAN and bind it with the readonly property of the UI element.
and in action handler assign a value to the context attribute. ABAP_TRUE to make it readonly
ABAP_FALSE to make it editable.

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