fix add more student

management/src/components/ExamRoomWorkspace.tsx

@@ -69,6 +69,7 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
   const [submissions, setSubmissions] = useState<ExamSubmission[]>([]);
   const [searchQ, setSearchQ] = useState('');
   const [searchHits, setSearchHits] = useState<{ studentRkId: number; fullName: string; studentCode: string; email: string; classCodes: string }[]>([]);
+  const [selectedPickerRkIds, setSelectedPickerRkIds] = useState<number[]>([]);
   const [paperTitle, setPaperTitle] = useState('');
   const [packagePdf, setPackagePdf] = useState<File | null>(null);
   const [packageResources, setPackageResources] = useState<File[]>([]);
@@ -210,6 +211,39 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
     await fetchOnline();
   };
 
+  const toggleHitSelection = (studentRkId: number) => {
+    setSelectedPickerRkIds((prev) =>
+      prev.includes(studentRkId) ? prev.filter((id) => id !== studentRkId) : [...prev, studentRkId]
+    );
+  };
+
+  const addSelectedStudents = async () => {
+    if (selectedPickerRkIds.length === 0) return;
+    try {
+      await apiExam.addStudents(examId, selectedPickerRkIds);
+      setSelectedPickerRkIds([]);
+      setStudentPickerOpen(false);
+      await load();
+      await fetchOnline();
+    } catch (e: any) {
+      alert(e?.message || 'Thêm sinh viên thất bại');
+    }
+  };
+
+  const toggleSelectAllHits = () => {
+    const enrolledIds = new Set(students.map((s) => s.studentRkId));
+    const unaddedHits = searchHits.filter((h) => !enrolledIds.has(h.studentRkId));
+    const allUnaddedIds = unaddedHits.map((h) => h.studentRkId);
+    if (allUnaddedIds.length === 0) return;
+
+    const areAllSelected = allUnaddedIds.every((id) => selectedPickerRkIds.includes(id));
+    if (areAllSelected) {
+      setSelectedPickerRkIds((prev) => prev.filter((id) => !allUnaddedIds.includes(id)));
+    } else {
+      setSelectedPickerRkIds((prev) => Array.from(new Set([...prev, ...allUnaddedIds])));
+    }
+  };
+
   const createPackage = async () => {
     if (!packagePdf) {
       setErr('Chọn file PDF cho gói đề');
@@ -820,7 +854,7 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                   <button
                     type="button"
                     className="btn btn-primary btn-sm"
-                    onClick={() => { setStudentPickerOpen(true); setSearchQ(''); setSearchHits([]); }}
+                    onClick={() => { setStudentPickerOpen(true); setSearchQ(''); setSearchHits([]); setSelectedPickerRkIds([]); }}
                   >
                     + Thêm sinh viên
                   </button>
@@ -846,7 +880,7 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                     <button
                       type="button"
                       className="btn btn-primary"
-                      onClick={() => { setStudentPickerOpen(true); setSearchQ(''); setSearchHits([]); }}
+                      onClick={() => { setStudentPickerOpen(true); setSearchQ(''); setSearchHits([]); setSelectedPickerRkIds([]); }}
                     >
                       + Thêm sinh viên
                     </button>
@@ -1168,15 +1202,31 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
               </button>
             </div>
             <div className="exam-student-modal-body">
-              <div className="exam-student-modal-search search-input-wrap">
+              <div className="exam-student-modal-search search-input-wrap" style={{ display: 'flex', gap: '0.5rem', alignItems: 'center' }}>
                 <input
                   type="search"
                   className="search-input"
                   placeholder="Tìm sinh viên..."
                   value={searchQ}
-                  onChange={(e) => setSearchQ(e.target.value)}
+                  onChange={(e) => {
+                    setSearchQ(e.target.value);
+                    setSelectedPickerRkIds([]);
+                  }}
                   autoFocus
+                  style={{ flex: 1 }}
                 />
+                {searchQ.trim() !== '' && searchHits.some((h) => !enrolledIds.has(h.studentRkId)) && (
+                  <button
+                    type="button"
+                    className="btn btn-secondary btn-sm"
+                    onClick={toggleSelectAllHits}
+                    style={{ whiteSpace: 'nowrap' }}
+                  >
+                    {searchHits.filter((h) => !enrolledIds.has(h.studentRkId)).every((h) => selectedPickerRkIds.includes(h.studentRkId))
+                      ? 'Bỏ chọn tất cả'
+                      : 'Chọn tất cả'}
+                  </button>
+                )}
               </div>
               <div className="exam-student-hits">
                 {searchQ.trim() === '' ? (
@@ -1192,6 +1242,7 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                 ) : (
                   searchHits.map((h) => {
                     const added = enrolledIds.has(h.studentRkId);
+                    const isSelected = selectedPickerRkIds.includes(h.studentRkId);
                     const initials = h.fullName
                       .split(/\s+/)
                       .filter(Boolean)
@@ -1199,7 +1250,27 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                       .map((w) => w[0]?.toUpperCase() || '')
                       .join('');
                     return (
-                      <div key={h.studentRkId} className="exam-student-hit">
+                      <div
+                        key={h.studentRkId}
+                        className={`exam-student-hit ${added ? 'exam-student-hit--added' : ''} ${isSelected ? 'exam-student-hit--selected' : ''}`}
+                        style={{ cursor: added ? 'default' : 'pointer' }}
+                        onClick={() => {
+                          if (!added) toggleHitSelection(h.studentRkId);
+                        }}
+                      >
+                        <div
+                          style={{ display: 'flex', alignItems: 'center' }}
+                          onClick={(e) => e.stopPropagation()}
+                        >
+                          <input
+                            type="checkbox"
+                            checked={added || isSelected}
+                            disabled={added}
+                            onChange={() => {
+                              if (!added) toggleHitSelection(h.studentRkId);
+                            }}
+                          />
+                        </div>
                         <div className="exam-student-hit-avatar" aria-hidden="true">{initials || '?'}</div>
                         <div className="exam-student-hit-info">
                           <strong>{h.fullName}</strong>
@@ -1213,7 +1284,10 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                           type="button"
                           className={`btn btn-sm ${added ? 'btn-secondary' : 'btn-primary'}`}
                           disabled={added}
-                          onClick={() => addStudent(h.studentRkId)}
+                          onClick={(e) => {
+                            e.stopPropagation();
+                            addStudent(h.studentRkId);
+                          }}
                         >
                           {added ? '✓ Đã thêm' : '+ Thêm'}
                         </button>
@@ -1223,6 +1297,31 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                 )}
               </div>
             </div>
+            <div className="modal-footer exam-student-modal-footer" style={{
+              display: 'flex',
+              justifyContent: 'flex-end',
+              gap: '0.75rem',
+              padding: '0.85rem 1.25rem',
+              borderTop: '1px solid var(--border-color, #dee2e6)',
+              background: 'var(--bg-subtle, #f8f9fa)',
+              borderRadius: '0 0 var(--radius-lg) var(--radius-lg)'
+            }}>
+              <button
+                type="button"
+                className="btn btn-secondary"
+                onClick={() => setStudentPickerOpen(false)}
+              >
+                Đóng
+              </button>
+              <button
+                type="button"
+                className="btn btn-primary"
+                disabled={selectedPickerRkIds.length === 0}
+                onClick={addSelectedStudents}
+              >
+                Thêm {selectedPickerRkIds.length > 0 ? `(${selectedPickerRkIds.length})` : ''} sinh viên đã chọn
+              </button>
+            </div>
           </div>
         </div>
       )}

management/src/index.css

@@ -4367,7 +4367,7 @@ input:checked + .slider:before {
 
 .exam-student-hit {
   display: grid;
-  grid-template-columns: auto 1fr auto;
+  grid-template-columns: auto auto 1fr auto;
   align-items: center;
   gap: 0.85rem;
   padding: 0.85rem 1rem;
@@ -4377,6 +4377,15 @@ input:checked + .slider:before {
   transition: var(--transition);
 }
 
+.exam-student-hit--added {
+  opacity: 0.85;
+}
+
+.exam-student-hit--selected {
+  border-color: var(--accent);
+  background-color: var(--accent-light, #fff5f5);
+}
+
 .exam-student-hit:hover {
   border-color: var(--accent);
   box-shadow: 0 2px 10px rgba(187, 33, 38, 0.08);