fix6

frontend/src/pages/MeetingDetailPage.jsx

@@ -40,6 +40,7 @@ const MeetingDetailPage = () => {
     const [isAddActionItemOpen, setIsAddActionItemOpen] = useState(false);
     const [newActionItem, setNewActionItem] = useState({ action: '', owner_id: '', due_date: '', item: '' });
     const [previewedItems, setPreviewedItems] = useState([]);
+    const [previewMessage, setPreviewMessage] = useState(''); // State for the preview result message
 
     const fetchMeetingData = useCallback(async () => {
         try {
@@ -94,7 +95,11 @@ const MeetingDetailPage = () => {
                     } else if (previewTask) { // Handle preview success
                         setPreviewTask(null);
                         if (updatedTask.state === 'SUCCESS' && updatedTask.info.items) {
-                            setPreviewedItems(updatedTask.info.items);
+                            if (updatedTask.info.items.length > 0) {
+                                setPreviewedItems(updatedTask.info.items);
+                            } else {
+                                setPreviewMessage('文本中未找到可提取的行動項目。');
+                            }
                         }
                     }
                 }
@@ -141,6 +146,8 @@ const MeetingDetailPage = () => {
     };
 
     const handlePreviewActionItems = async () => {
+        setPreviewedItems([]); // Clear previous results
+        setPreviewMessage(''); // Clear previous messages
         setPreviewTask({ state: 'PENDING', info: 'Initializing preview task...' });
         try {
             // This now calls the async task endpoint
@@ -244,9 +251,10 @@ const MeetingDetailPage = () => {
                             )}
 
                             {canManageMeeting && (<Box sx={{ mt: 3 }}>
-                        <Button variant="outlined" startIcon={<PreviewIcon />} onClick={handlePreviewActionItems} disabled={previewTask || summaryTask || isEditingSummary || (!meeting.summary && !meeting.transcript)}>
+                        <Button variant="outlined" startIcon={<PreviewIcon />} onClick={handlePreviewActionItems} disabled={previewTask || summaryTask || isEditingSummary || !meeting.transcript}>
                             {previewTask ? <CircularProgress size={24} /> : "Preview Action Items"}
                         </Button>
+                        {previewMessage && <Alert severity="info" sx={{ mt: 2 }}>{previewMessage}</Alert>}
                         {previewedItems.length > 0 && (<Box>
                             <TableContainer component={Paper} sx={{ mt: 2 }}><Table size="small">
                                 <TableHead><TableRow><TableCell>Context/Item</TableCell><TableCell>Action</TableCell><TableCell>Owner</TableCell><TableCell>Due Date</TableCell></TableRow></TableHead>