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Sort a list in lotus script

I'm working on an action that will take a list of names (obtained from a form) and lookup their associated group. Pull each groupname onto a list (unique names only) then update the group field on the form.

The problem I have is, before I update the group name field I want comapare the new version with the old and alert the user of the change. But the 2 fields have the groupnames in different order. Has anyone written a list compare function that can handle that?

Thx!
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BillTr
Asked:
BillTr
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1 Solution
 
Sjef BosmanGroupware ConsultantCommented:
I must have a sort() function somewhere, but there's an easier solution in R6: use the Evaluate() function. Pass a formula as a string parameter, it returns the output values as an array.

In your case you don't even have to sort, but you might "subtract" both lists (assuming that you don't exchange two groupnames in which case there won't be differences!).

Example:

Dim v As Variant

v= Evaluate(|@Trim(@Replace(FieldWithNewNames;FieldWithOldNames;""))|, doc)
If v(0)="" Then
   ' nothing changed
Else
   'changes!!
End If
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BillTrAuthor Commented:
His Sjef,
Did you mean to use @compare? I've been experimenting with this.
DUPCHKLIST is just a comma delimited string that I build. OldList is also a string field, read in from the doc.

Dim v As Variant
DUPCHKLIST = Evaluate(|@sort(DUPCHKLIST;)|)
v= Evaluate(|@Trim(@Compare(DUPCHKLIST;OLDLIST;""))|, doc)
   If v(0)="" Then
        Msgbox "No change"
   Else
       Msgbox "changed"
  End If
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BillTrAuthor Commented:
Sjef,
If you can just help me with the sort on the DUPCHKLIST. That should do it.

Thx!
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Sjef BosmanGroupware ConsultantCommented:
Nope, I picked @Replace purposely, I don't need @Compare. But if there's a better function to do it, be my guest. The general idea is to use Evaluate() to solve this type of problems. The example is just that: an example.

The @Replace(l1;l2;"") will replace all list values in l1 that occur in l2 by the empty string. The @Trim(l3) will remove empty strings from the list l3 and leave the rest. If there is no rest, it will leave the empty string as only element.

Of course, there could be mistakes in the code... Warranty up to and including the threshold... :-P
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Sjef BosmanGroupware ConsultantCommented:
Oh, sorry, forgot something: the values should be LISTS. So if you have a string that contains commas, you'd have to @Explode it first.

v= Evaluate(|@Trim(@Replace(@Explode(Dubcek;",");OldNames;""))|, doc)
If v(0)="" Then
   ' nothing changed
Else
   'changes!!
End If

If OldNames is also comma-delimited, put another @Explode(OldNames; ",") instead of it.
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BillTrAuthor Commented:
That works great, but can I sort Dupchklist?

Something like:
v = Evaluate(|@Trim(@Sort(@Explode(DUPCHKLIST;","))|,doc)???
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SysExpertCommented:
http://www-10.lotus.com/ldd/sandbox.nsf/ecc552f1ab6e46e4852568a90055c4cd/c53130426d18db0e85256f7b00571d46?OpenDocument&Highlight=0,group

This is the code sample for the article, "Working with groups in LotusScript."

also read the article itself.


I hope this helps !
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Sjef BosmanGroupware ConsultantCommented:
v = Evaluate(|@Sort(@Explode(DUPCHKLIST;","))|,doc)

The parentheses didn't match, and the @Trim wasn't very useful, so I removed it.
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BillTrAuthor Commented:
I keep getting an empty variant.. here is the code I tried.

NEWGROUPlist= Evaluate(|@Sort(@Explode(DUPCHKLIST;";"))|,doc)

NEWGROUPlist= Evaluate(|@Explode(DUPCHCKLIST)|)

DUPCHKLIST is delimited by ;

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Sjef BosmanGroupware ConsultantCommented:
The doc as a parameter is required, the formula interpreter needs to have a context. If there is a field DUPCHKLIST in the doc. So the second will never work, it needs to be

NEWGROUPlist= Evaluate(|@Explode(DUPCHCKLIST)|, doc)

The first one should work, your Notes-version is R6. I hope you didn't have those two calls together in your code?

Maybe use the debugger, so you can step through the code and inspect every variable.
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BillTrAuthor Commented:
DUPCHCKLIST (now NEWGROUPstr) is a delimited string I build by pulling data out of a view. There is not a field on the form by that name.

 I changed the name to make the variable type a bit more clear.
NEWGROUPlist= Evaluate(|@Sort(@Explode(NEWGROUPstr;";"))|,doc)
NEWGROUPlist = "" when I run.
NEWGROUPstr = "group1;group2;group3"



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Sjef BosmanGroupware ConsultantCommented:
Aaaaah... Me bad.

NEWGROUPlist= Evaluate(|@Sort(@Explode("| + NEWGROUPstr + |";";"))|,doc)

Since Formula doesn't know a thing about NEWGROUPstr, you have to create the complete string first, by embedding the variable's contents, and then call Evaluate.
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BillTrAuthor Commented:
Great!

So... another dumb question. Now that I have my list sorted, I want to display it back to the user.
I assume that means a coversion back to the text via an implode, but I get type mismatch when I try that.
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Sjef BosmanGroupware ConsultantCommented:
Heh, no, easier: in LotusScript we have Split and Join instead of @Explode and @Implode

Try to set the textfield's value to Join(yourarray, ";")
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BillTrAuthor Commented:
Worked great! Thanks again for the help!
You helped me on several things so I increased the points.
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Sjef BosmanGroupware ConsultantCommented:
Gweat!
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