--- loncom/interface/lonnavmaps.pm	2015/04/13 16:46:43	1.506
+++ loncom/interface/lonnavmaps.pm	2015/04/15 18:56:15	1.507
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Navigate Maps Handler
 #
-# $Id: lonnavmaps.pm,v 1.506 2015/04/13 16:46:43 raeburn Exp $
+# $Id: lonnavmaps.pm,v 1.507 2015/04/15 18:56:15 raeburn Exp $
 
 #
 # Copyright Michigan State University Board of Trustees
@@ -5622,6 +5622,39 @@ sub completable {
     return 0;
 }
 
+=pod
+
+B<Answerable>
+
+The answerable method differs from the completable method in its handling of problem parts
+for which feedback on correctness is suppressed, but the student still has tries left, and
+the problem part is not past due, (i.e., the student could submit a different answer if
+he/she so chose). For that case completable will return 0, whereas answerable will return 1.
+
+=cut
+
+sub answerable {
+    my $self = shift;
+    if (!$self->is_problem()) { return 0; }
+    my $partCount = $self->countParts();
+    foreach my $part (@{$self->parts()}) {
+        if ($part eq '0' && $partCount != 1) { next; }
+        my $status = $self->status($part);
+        if ($self->getCompletionStatus($part) == ATTEMPTED() ||
+            $self->getCompletionStatus($part) == CREDIT_ATTEMPTED() ||
+            $status == ANSWER_SUBMITTED() ) {
+            if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
+                return 1;
+            }
+        }
+        if ($status == OPEN() || $status == TRIES_LEFT() || $status == NETWORK_FAILURE()) {
+            return 1;
+        }
+    }
+    # None of the parts were answerable, so neither is this problem.
+    return 0;
+}
+
 =pod
 
 =head2 Resource/Nav Map Navigation