Update app.py

app.py

@@ -1,19 +1,24 @@
 import gradio as gr
 
-# This function is called whenever the class dropdown changes.
-def update_student_dropdown(class_selection):
-    # Generate the list of student numbers for the selected class
-    student_numbers = [f"{class_selection}{str(i).zfill(2)}" for i in range(1, 41)]
-    return student_numbers
+def update_dropdown(class_prefix):
+    # Check if a class prefix is selected
+    if class_prefix is None:
+        # If no class is selected, return an empty list
+        return []
+    else:
+        # Generate student numbers for the selected class
+        return [f"{class_prefix}{str(i).zfill(2)}" for i in range(1, 41)]
 
-# Define your class options for the dropdown
+# Define the options for the first dropdown
 class_options = ["5H", "5E", "5RS"]
 
+# Create the Gradio interface
 with gr.Blocks() as demo:
     class_dropdown = gr.Dropdown(label="Class", choices=class_options, value="5H")
-    student_dropdown = gr.Dropdown(label="Student", choices=update_student_dropdown("5H"))
-    
-    # Use the change event to update the student dropdown when the class changes
-    class_dropdown.change(fn=update_student_dropdown, inputs=class_dropdown, outputs=student_dropdown)
+    student_dropdown = gr.Dropdown(label="Student", choices=update_dropdown("5H"))
 
+    # When the selected class changes, update the student dropdown
+    class_dropdown.change(fn=update_dropdown, inputs=[class_dropdown], outputs=[student_dropdown])
+
+# Launch the app
 demo.launch()