Update app.py

app.py

@@ -235,7 +235,9 @@ app.layout = dbc.Container([
             dcc.Slider(id="depth-slider", min=1, max=10, step=1, value=3, marks={i: str(i) for i in range(1, 11)}, className="mb-3"),
             dbc.Button("Convert to PDF", id="submit-button", color="primary", className="mb-3 w-100"),
             dbc.Button("Download PDF", id="download-button", color="secondary", className="mb-3 w-100", disabled=True),
-            dbc.Spinner(html.Div(id="output-area"), color="primary", type="grow"),
+            html.Div([
+                dbc.Spinner(html.Div(id="progress-message"), color="primary", type="grow", size="lg"),
+            ], className="text-center mb-3"),
             dcc.Interval(id="progress-interval", interval=1000, n_intervals=0, disabled=True),
             dcc.Download(id="download-pdf")
         ]),
@@ -243,18 +245,6 @@ app.layout = dbc.Container([
     )
 ], fluid=True)
 
-@app.callback(
-    Output("download-button", "disabled"),
-    Output("download-button", "color"),
-    Output("progress-interval", "disabled"),
-    Output("pdf-store", "data"),
-    Input("submit-button", "n_clicks"),
-    Input("progress-interval", "n_intervals"),
-    Input("progress-store", "data"),
-    State("url-input", "value"),
-    State("depth-slider", "value"),
-    prevent_initial_call=True
-)
 def update_output(n_clicks, n_intervals, progress_data, url, depth):
     ctx = dash.callback_context
     if not ctx.triggered:
@@ -264,26 +254,29 @@ def update_output(n_clicks, n_intervals, progress_data, url, depth):
 
     if triggered_id == "submit-button":
         if not url:
-            return True, "secondary", True, None
+            return True, "secondary", True, None, "Please enter a URL"
 
         # Start the background task
         task_id = str(uuid.uuid4())
         executor.submit(background_task, url, depth, task_id)
         
-        return True, "secondary", False, None
+        return True, "secondary", False, None, "Processing... Please wait."
 
     elif triggered_id == "progress-interval" or triggered_id == "progress-store":
         if progress_data is None:
-            return True, "secondary", False, None
+            return True, "secondary", False, None, "Processing... Please wait."
         
-        if isinstance(progress_data, str) and progress_data.startswith("Error"):
-            return True, "secondary", True, None
+        if isinstance(progress_data, str):
+            if progress_data.startswith("Error"):
+                return True, "secondary", True, None, progress_data
+            else:
+                return True, "secondary", False, None, progress_data
         
         if isinstance(progress_data, bytes):
             encoded = base64.b64encode(progress_data).decode()
-            return False, "primary", True, encoded
+            return False, "primary", True, encoded, "PDF ready for download!"
 
-    return True, "secondary", False, None
+    return True, "secondary", False, None, ""
 
 @app.callback(
     Output("download-pdf", "data"),