issue with get legend items

[#1]

In JMP18 (18.1.1) this example from scripting index doesn't work:

Names Default To Here( 1 );

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
gb = Graph Builder(
	Variables( X( :height ), Y( :weight ), Overlay( :sex ), Color( :age ) ),
	Elements( Points( X, Y, Legend( 1 ) ), Smoother( X, Y, Legend( 2 ) ) )
);
server = gb << Get Legend Server;
items = server << Get Legend Items;
For Each( {item, index}, items[1],
	item << Set Label( "Item " || Char( index ) )
);

It produces the error message:

so, Legend Server <<  get legend items()

doesn't return scriptable objects?

[#2]

workaround:
use get legend item

Don't forget to pre-evaluate i for get legend item

- for set label no pre-evaluation is needed.

Names Default To Here( 1 );

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
gb = Graph Builder(
	Variables( X( :height ), Y( :weight ), Overlay( :sex ), Color( :age ) ),
	Elements( Points( X, Y, Legend( 1 ) ), Smoother( X, Y, Legend( 2 ) ) )
);
server = gb << Get Legend Server;
Nitems = Nitems(( server << Get Legend Items)[1]);
for(i=1, i<= Nitems, i++, 
Eval(Eval Expr(item = server  << Get Legend Item(1, Expr(i))));
	item << Set Label( "Item " || Char( i ) )
);

[#3]

Next trap: doesn' work for Bar Graphs ?

Names Default To Here( 1 );

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
gb =Graph Builder(
	Variables( X( :age ), Y( :weight ), Overlay( :sex ) ),
	Elements( Bar( X, Y ) )
);
server = gb << Get Legend Server;

items = server << Get Legend Items;
show(items);

server << get legend item(1,1) // error message

edit: I could not reproduce the issue on another computer / after a restart of JMP (?).

[#4]

It actually does return scriptable objects.  Looks like this is a bug with For Each().  If you change the code to something that should be equivalent, it works.

Names Default To Here( 1 );

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
gb = Graph Builder(
	Variables( X( :height ), Y( :weight ), Overlay( :sex ), Color( :age ) ),
	Elements( Points( X, Y, Legend( 1 ) ), Smoother( X, Y, Legend( 2 ) ) )
);
server = gb << Get Legend Server;
items = server << Get Legend Items;
For Each( {item, index}, items[1],
	items[1][index] /*isn't this exactly what item is?*/ << Set Label( "Item " || Char( index ) )
);

[#5]

Ah, sorry, you are right, the individual items are indeed scriptable.

Interesting: a batch message like items << get label produces the same issue.
maybe batch messages use for each in the background ?

Digging deeper, I found an old ticket: TS-00128192

Fortunately, in the mean time the issue got enough prio -- in JMP19 (EA5) it's fixed:

Names Default To Here( 1 );

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
gb = Graph Builder(
	Variables( X( :height ), Y( :weight ), Overlay( :sex ), Color( :age ) ),
	Elements( Points( X, Y, Legend( 1 ) ), Smoother( X, Y, Legend( 2 ) ) )
);
server = gb << Get Legend Server;
items = server << Get Legend Items;

items << get label // same issue as with for each

show(items[1][1])
items[1][1] << get label(); // OK, on the lowest level, there is a scriptable object 

Show(tmp = items[1][1::2]); // then this is a list of ...
tmp[1] << get Label(); // ...no

[#6]

---

@mmarchandFSLR wrote:

It actually does return scriptable objects.  

on the other hand ... a bit surprising:

JMP19: