updates for dropdown list

app.py

@@ -77,6 +77,10 @@ class myTheme(Base):
         )
 
 
+def on_select(evt: gr.SelectData):  # SelectData is a subclass of EventData
+    return evt.value
+
+
 def detect_lang(article):
     """
     Language Detection using library langid
@@ -135,8 +139,8 @@ with gr.Blocks(theme=myTheme) as demo:
     lang_select = gr.Radio(["English", "Chinese"], label="Select Desired Language")
     result = gr.Textbox(label="Translated Result")
     trans_btn = gr.Button("Translate")
-    if toolkit_select.select == "OPUS":
+    if toolkit_select.select(on_select, None, toolkit_select):
         trans_btn.click(fn=opus_trans, inputs=[article, lang_select], outputs=result)
-    elif toolkit_select.select == "NLLB":
+    elif toolkit_select.select(on_select, None, toolkit_select):
         trans_btn.click(fn=opus_trans, inputs=[article, lang_select], outputs=result)
 demo.launch()