diff --git a/nengo_gui/components/htmlview.py b/nengo_gui/components/htmlview.py
index b7486c79..c609e68e 100644
--- a/nengo_gui/components/htmlview.py
+++ b/nengo_gui/components/htmlview.py
@@ -1,5 +1,7 @@
 import collections
 
+import nengo
+
 from nengo_gui.components.component import Component
 
 
@@ -10,31 +12,50 @@ class HTMLView(Component):
 
     def __init__(self, obj):
         super(HTMLView, self).__init__()
-        self.obj = obj
-        self.obj_output = obj.output
         self.data = collections.deque()
 
+        self.obj = obj
+        self.obj_output = self.obj.output
+        self.callable_html = callable(obj.output._nengo_html_)
+        if self.callable_html:
+            assert self.obj.size_out > 0
+        else:
+            assert callable(self.obj_output)
+
     def attach(self, page, config, uid):
         super(HTMLView, self).attach(page, config, uid)
         self.label = page.get_label(self.obj)
 
     def add_nengo_objects(self, page):
-        with page.model:
+        if self.callable_html:
+            with page.model:
+                self.node = nengo.Node(
+                    self.gather_data, size_in=self.obj.size_out)
+                self.conn = nengo.Connection(self.obj, self.node, synapse=None)
+        else:
             self.obj.output = self.gather_data
 
     def remove_nengo_objects(self, page):
-        self.obj.output = self.obj_output
+        if self.callable_html:
+            page.model.connections.remove(self.conn)
+            page.model.nodes.remove(self.node)
+        else:
+            self.obj.output = self.obj_output
 
     def gather_data(self, t, *x):
-        value = self.obj_output(t, *x)
-        data = '%g %s' % (t, self.obj_output._nengo_html_)
-        self.data.append(data)
+        if self.callable_html:
+            value = None
+            html = self.obj_output._nengo_html_(t, *x)
+        else:
+            value = self.obj_output(t, *x)
+            html = self.obj_output._nengo_html_
+
+        self.data.append('%g %s' % (t, html))
         return value
 
     def update_client(self, client):
         while len(self.data) > 0:
-            item = self.data.popleft()
-            client.write_text(item)
+            client.write_text(self.data.popleft())
 
     def javascript(self):
         info = dict(uid=id(self), label=self.label)
diff --git a/nengo_gui/components/netgraph.py b/nengo_gui/components/netgraph.py
index efebcbf2..d486d50a 100644
--- a/nengo_gui/components/netgraph.py
+++ b/nengo_gui/components/netgraph.py
@@ -532,7 +532,7 @@ def get_extra_info(self, obj):
                     isinstance(obj.output, OverriddenOutput)
                     and obj.output.base_output is None):
                 info['passthrough'] = True
-            if callable(obj.output) and hasattr(obj.output, '_nengo_html_'):
+            if hasattr(obj.output, '_nengo_html_'):
                 info['html'] = True
             info['dimensions'] = int(obj.size_out)
         elif isinstance(obj, nengo.Ensemble):