Update app.py

app.py

@@ -9,6 +9,7 @@ import dash
 import dash_bootstrap_components as dbc
 from dash import dcc, html, Input, Output, State, callback, MATCH, ALL
 from dash.exceptions import PreventUpdate
+
 from PyPDF2 import PdfReader, PdfWriter
 
 # Set up logging
@@ -53,9 +54,10 @@ app.layout = dbc.Container([
     ], className="my-3"),
     dbc.Button("Split PDF", id='split-button', color="primary", className="mt-3", disabled=True),
     dbc.Progress(id='progress-bar', className="my-3"),
+    dbc.Spinner(html.Div(id='processing-spinner'), color="primary", type="grow"),  # Add spinner
     dbc.Button("Download ZIP", id='download-button', color="success", className="mt-3", disabled=True),
     dcc.Download(id="download-zip"),
-    html.Div(id='log-output', style={'whiteSpace': 'pre-line'}),  # Add this line for log output
+    html.Div(id='log-output', style={'whiteSpace': 'pre-line'}),
 ], fluid=True)
 
 @callback(
@@ -138,6 +140,7 @@ def process_pdf(contents, filename, ranges):
     Output('progress-bar', 'value'),
     Output('download-button', 'disabled'),
     Output('log-output', 'children'),
+    Output('processing-spinner', 'children'),  # Add output for spinner
     Input('split-button', 'n_clicks'),
     State('upload-pdf', 'contents'),
     State('upload-pdf', 'filename'),
@@ -156,12 +159,13 @@ def split_pdf(n_clicks, contents, filename, ranges):
     thread = Thread(target=process_pdf, args=(contents, filename, ranges))
     thread.start()
     
-    return 0, True, "PDF splitting process started. Check console for detailed logs."
+    return 0, True, "PDF splitting process started. Check console for detailed logs.", "Processing..."
 
 @callback(
     Output('progress-bar', 'value', allow_duplicate=True),
     Output('download-button', 'disabled', allow_duplicate=True),
     Output('log-output', 'children', allow_duplicate=True),
+    Output('processing-spinner', 'children', allow_duplicate=True),  # Add output for spinner
     Input('progress-bar', 'value'),
     prevent_initial_call=True
 )
@@ -169,12 +173,12 @@ def update_progress(value):
     global progress
     if progress == 100:
         logger.info("PDF splitting completed")
-        return 100, False, "PDF splitting completed. Click 'Download ZIP' to get your files."
+        return 100, False, "PDF splitting completed. Click 'Download ZIP' to get your files.", ""
     elif progress == -1:
         logger.error("PDF splitting failed")
-        return 0, True, "Error occurred during PDF splitting. Check console for details."
+        return 0, True, "Error occurred during PDF splitting. Check console for details.", ""
     else:
-        return progress, True, f"Processing... {progress:.0f}% complete"
+        return progress, True, f"Processing... {progress:.0f}% complete", "Processing..."
 
 @callback(
     Output("download-zip", "data"),