In one of our post in Web Dynpro we showed that WDY_BOOLEAN and FLAG data elements, which are both of type CHAR 1 behave differently. Similarly, very recently, I came to know that all CHAR1 data elements are not same.
Let us look this example.
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text-001. PARAMETERS: p_init TYPE char1. SELECTION-SCREEN END OF BLOCK b1.
You expect a selection screen parameter with one character length. You are right.
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Now, instead of TYPE CHAR1, let us take BOOLE_D which is also of TYPE CHAR1.
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text-001. PARAMETERS: p_delt TYPE boole_d. SELECTION-SCREEN END OF BLOCK b1.
What do you expect the output to be?
Honestly, I expected the same as above. One character placeholder. But to my surprise, when I execute this piece of code, it gave me a CHECKBOX.
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All these years, I have been using the explicit CHECKBOX statement to generate a checkbox in the selection screen. And every time, I needed to declare a checkbox in my selection screen, I needed to refer to previous code snippet, google or do an F1 to get the syntax. Even after 10 years of ABAP programming, I do not remember the syntax (actually, I do not want to).
But not anymore. Now, I can declare a CHECKBOX in my selection screen without referring anything.. Image may be NSFW.
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This is the explicit CHECKBOX syntax.
* Explicit CHECKBOX syntax SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text-001. PARAMETERS: p_init AS CHECKBOX. SELECTION-SCREEN END OF BLOCK b1.
This is WITHOUT AS CHECKBOX keyword
* CHECKBOX through data element SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME TITLE text-001. PARAMETERS: p_delt TYPE boole_d. SELECTION-SCREEN END OF BLOCK b1.
The output of both these PARAMETERS is the same.
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So next time you need a CHECKBOX for your program, you have another alternative. Image may be NSFW.
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Also Read: Six Selection Screen Development in every other Project
Please note: All one character data elements of TYPE CHAR1 which has a domain with Value Range X and blank can be used for CHECKBOX declaration.
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Data elements like WDY_BOOLEAN, BOOLE_D, FLAG, LVOMA etc can be used for CHECKBOX.
I am sure, all of us knew about the Value Range domains. But did you really use them in such practical cases?
Food for thought:
Data element FLAG can be used for CHECK BOX declaration. Can we NOT use data element FLAG1 for CHECK BOX declaration? FLAG1 is also CHAR1 type. Image may be NSFW.
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