Update app.py

app.py

@@ -9,8 +9,12 @@ with gr.Blocks() as demo:
     val = gr.State(None)
     input_text = gr.Textbox(label="Input")
     output_text = gr.Textbox(label="Output")
+    submit_button = gr.Button("Submit")
 
-    input_text.change(respond, [input_text, val], val)
-    val.change(lambda val: val, val, output_text)
+    def on_submit(newVal, previous_val):
+        updated_val = respond(newVal, previous_val)
+        return updated_val, updated_val
+
+    submit_button.click(on_submit, [input_text, val], [val, output_text])
 
 demo.launch()