Added alert pop up on graph save #2

editor/js/tools/savetool.js

@@ -9,8 +9,9 @@ export default class SaveTool extends Tool {
     }
 
     onToolActivate() {
-        saveGraphJson(SPACE, graph.getCleanData());    // space_id defined globaly through knowledge-space.php
+        saveGraphJson(SPACE, graph.getCleanData());
         graph.saveChanges();
         state.setTool(state.previousTool);
+        alert("Graph has been saved.");
     }
 }