Update app.py

app.py

@@ -9,7 +9,7 @@ import folium
 from folium.plugins import MarkerCluster
 from branca.colormap import linear
 
-# ---------- 可選依賴偵測（表格美化用，沒裝也能跑） ----------
+# ---------- 可選依賴偵測（表格美化；沒裝也能跑） ----------
 try:
     import tabulate as _tabulate  # noqa: F401
     HAS_TABULATE = True
@@ -252,8 +252,8 @@ def query_and_render(time_from, time_to, sort_order):
         map_html = map_osm_html(df)
 
         csv_bytes = df.to_csv(index=False).encode("utf-8-sig")
-        # Gradio DownloadButton 接受 bytes 或路徑；這裡直接給 bytes
-        return md, map_html, csv_bytes
+        # 回傳 (bytes, filename) 讓舊版 Gradio 也能指定檔名
+        return md, map_html, (csv_bytes, "CWA_E-A0015-001.csv")
     except Exception as e:
         return f"錯誤：{e}", "<div style='padding:8px'>（無法繪圖）</div>", None
 
@@ -285,7 +285,7 @@ with gr.Blocks(fill_height=True) as demo:
 
         table_out = gr.Markdown("（尚未查詢）")
         map_out = gr.HTML()  # 嵌入 OSM 互動地圖
-        dl_btn = gr.DownloadButton(label="下載 CSV", value=None, file_name="CWA_E-A0015-001.csv")
+        dl_btn = gr.DownloadButton(label="下載 CSV")  # 不使用 file_name
 
     # 快速鍵
     btn_12h.click(lambda: set_time_range(hours=12), outputs=[time_from, time_to])