Update app.py

app.py

@@ -500,15 +500,16 @@ function draw() {
         drawLoopPathsFor(name); // draw overlay highlights for loops involving this node
     }
 
-    nodeCircleGroup.on("click", function(e,d){
+    nodeCircleGroup.on("click", function(event, d){
         selectNode(d);
-        if (e && e.stopPropagation) e.stopPropagation();
+        event.stopPropagation();
     });
-    labelGroup.on("click", function(e,d){
+    labelGroup.on("click", function(event, d){
         selectNode(d);
-        if (e && e.stopPropagation) e.stopPropagation();
+        event.stopPropagation();
     });
 
+
     document.getElementById("arc-reset").onclick = resetOpacity;
     svg.on("click", function(evt){
         // Only reset when clicking empty background, not circles, not labels, not paths