Update app.py

app.py

@@ -111,14 +111,19 @@ def main():
                 # Initial Zoom Level
                 zoom_level = st.sidebar.slider("Initial Zoom Level", min_value=1, max_value=20, value=3)
 
-                # Create the map based on color mode
+                # Validate Color Scale Selection
+                if color_mode == "Color Scale" and not color_column:
+                    st.sidebar.warning("Please select a column for color scale.")
+                    st.stop()  # Prevent further execution until a column is selected
+
+                # Determine color parameters based on color mode
                 if color_mode == "Color Scale" and color_column:
                     # Color Scale Mode with a selected color column
                     color_param = color_column
                     color_discrete_sequence = None
                     color_continuous_scale = "Viridis"
                 elif color_mode == "Color Scale" and not color_column:
-                    # Color Scale Mode without a selected color column
+                    # Color Scale Mode without a selected color column (handled above)
                     color_param = None
                     color_discrete_sequence = "Viridis"
                     color_continuous_scale = None
@@ -128,7 +133,7 @@ def main():
                     color_discrete_sequence = [color]
                     color_continuous_scale = None
 
-                # Create the map
+                # Create the map based on size and color settings
                 if size_col:
                     fig = px.scatter_mapbox(
                         valid_df,
@@ -162,9 +167,16 @@ def main():
                         title="Interactive Map"
                     )
                     if color_mode == "Single Color":
-                        # Update marker color directly
+                        # Update marker color directly for Single Color Mode
                         fig.update_traces(marker=dict(color=color))
-                
+                    else:
+                        # If no color is set, ensure default color scale
+                        pass
+
+                # Apply default bubble size when no size column is selected
+                if not size_col:
+                    fig.update_traces(marker=dict(size=default_size))
+
                 # Update layout for better aesthetics
                 fig.update_layout(
                     margin={"r":0,"t":30,"l":0,"b":0},