VIEW MEMBER FEEDACK TO THIS TIP
Whether it's because of ignorance or inexperience, I find that string and list handling are not completely covered in Formula language. I often find myself "inventing" functionality that would well defend a permanent place in Formula coding as a built-in function.
I offer to you a widget I sometimes use to cull elements from a list. I've dressed it up for testing. I would appreciate users testing this and responding with suggestions for improvements -- supposing that it is logically sound and fail-safe (I haven't really done that).
If this is already a built-in Formula feature, I haven't seen it thus far. But if it does already exist, I would appreciate any information you have about it.
REM {Keep only elements from one
list not in the other list -- differentiate them.
Place this code in an action button or paste the code
into any text field on a form and enter CTRL+SHIFT+F9
to execute the code. You may also increase usability by
converting the lists to lowercase
using @LowerCase before comparing, for example.};
REM {List1 is the original list in which you wish to keep
only elements not present in List2,
it replaces the elements in List2 with "" in List1};
list1 := @Prompt([OkCancelEdit];
"Enter list1"; "Please enter a list of elements";
"summer, winter, spring" );
list1 := @Explode( list1 );
@Prompt([OK] ; "This is your list" ;
@Implode( @Sort( @Trim( list1 ) ) ; @Newline ) );
list2 := @Prompt([OkCancelEdit];
"Which element(s) would you like to remove?
(from List1)"; "Enter the element(s) here";
"summer, winter, leaf");
list2 := @Explode( list2 );
@Prompt([OK] ; "You wish to remove" ;
@Trim(@Implode(list2 ; @Newline)) );
result := @Replace( list1 ; list2; "");
@Prompt([Ok] ; "Result" ;
"Remaining entries: " + @NewLine +
@Implode(@Sort(result) ; @NewLine ) +
@NewLine + @NewLine + "Cleared:" +
@NewLine + @NewLine + @Implode(@Sort(list2) ;
@Newline ) + @NewLine + + @NewLine + "** from **"
+ @NewLine + @NewLine + @Implode(@Sort(list1) ; @Newline) )
MEMBER FEEDBACK TO THIS TIP
You can also use:
@ReplaceSubstring( list1 ; list2 ; "" )) )
For example:
list1 := @Explode( "summer, winter, spring" );
list2 := @Explode( "summer, winter, leaf" );
FIELD Exe := Exe; @SetField
("Exe";@Trim(@ReplaceSubstring( list1 ; list2 ; "" )) )
—Bala R.
******************************************
You can also replace @NewLine with @Char(10) throughout the entire formula. Otherwise, all the displays truncate after a single entry.
I don't know if this only occurs on our Lotus Notes installation, but I find that in column formula and @prompts @Char(10) works, whereas @Newline usually doesn't.
—Angelo M.
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