Merge pull request #3 from TileDB-Inc/nb/sync_to_dom

sync to dom on startup

Author: normanb

pybabylonjs/babylonjs.py

@@ -36,26 +36,29 @@ class BabylonJS(DOMWidget):
 
     @validate("value")
     def _valid_value(self, proposal):
-        reqd = ["X", "Y", "Z", "Red", "Green", "Blue"]
-
-        if not all(key in proposal.value.keys() for key in reqd):
-            raise TraitError(f"Missing one of {reqd} in input")
-
-        data = {}
-        data["X"] = proposal.value["X"].tolist()
-        data["Y"] = proposal.value["Y"].tolist()
-        data["Z"] = proposal.value["Z"].tolist()
-        data["Red"] = proposal.value["Red"].tolist()
-        data["Green"] = proposal.value["Green"].tolist()
-        data["Blue"] = proposal.value["Blue"].tolist()
-
-        self.extents = [
-            min(data["X"]),
-            max(data["X"]),
-            min(data["Y"]),
-            max(data["Y"]),
-            min(data["Z"]),
-            max(data["Z"]),
-        ]
-
-        return json.dumps(data)
+        if proposal.value:
+            reqd = ["X", "Y", "Z", "Red", "Green", "Blue"]
+
+            if not all(key in proposal.value.keys() for key in reqd):
+                raise TraitError(f"Missing one of {reqd} in input")
+
+            data = {}
+            data["X"] = proposal.value["X"].tolist()
+            data["Y"] = proposal.value["Y"].tolist()
+            data["Z"] = proposal.value["Z"].tolist()
+            data["Red"] = proposal.value["Red"].tolist()
+            data["Green"] = proposal.value["Green"].tolist()
+            data["Blue"] = proposal.value["Blue"].tolist()
+
+            self.extents = [
+                min(data["X"]),
+                max(data["X"]),
+                min(data["Y"]),
+                max(data["Y"]),
+                min(data["Z"]),
+                max(data["Z"]),
+            ]
+
+            return json.dumps(data)
+        else:
+            return proposal.value