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difference between at new and on change of
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Answer Posted / suresh kumar
When we use At new for a field, it will trigger whenever
there is any change in all the fields from the left to that
of the particular field. But when we use On change of it
triggers only when there is any change in the particular field.
At new can only be used inside loop. On change of can used
outside the loop.
No logical Expressions can be added with at new. Logical
expression like OR can be used with on change of.
When AT NEW occurs, the alpha-numeric fields have * in their
value, where as in case of On Change, the alphanumeric
fields have their Corresponding value, of that particular
record, where the Event gets fired.
In the below code it matters with structure sequence.
If 1st column to be BUKRS and 2nd column to be F1 in ITAB
Structure then the At New event will show F1 column values
as '*' asterisks.
REPORT ZGSK.
*..........AT NEW Vs ON CHANGE OF EVENTs.............. *
DATA : BEGIN OF ITAB OCCURS 0,
F1(10) TYPE C,
BUKRS LIKE T001-BUKRS,
END OF ITAB.
ITAB-BUKRS = '1000'.
ITAB-F1 = 'ababcbcb'.
APPEND ITAB.
ITAB-BUKRS = '1100'.
ITAB-F1 = '1233333'.
APPEND ITAB.
ITAB-BUKRS = '1100'.
ITAB-F1 = '3333333'.
APPEND ITAB.
ITAB-BUKRS = '1200'.
ITAB-F1 = '555555'.
APPEND ITAB.
*AT NEW
LOOP AT ITAB.
AT NEW BUKRS.
WRITE :/ ITAB-BUKRS , ITAB-F1.
ENDAT.
ENDLOOP.
ULINE.
*AT ONCHANGE
LOOP AT ITAB.
ON CHANGE OF ITAB-BUKRS.
WRITE :/ ITAB-BUKRS , ITAB-F1.
ENDON.
ENDLOOP.
ULINE.
*AT ONCHANGE with Logical Expression "OR"
LOOP AT ITAB.
ON CHANGE OF ITAB-BUKRS or ITAB-F1.
WRITE :/ ITAB-BUKRS , ITAB-F1.
ENDON.
ENDLOOP.
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