feat: 新增年级/班级时已添加的选项禁用显示

- 新增年级弹窗：已挂载的年级显示为灰色不可选（已添加）
- 新增班级弹窗：已挂载的班级显示为灰色不可选（已添加）
- 从树形数据中获取已有年级/班级的ID列表传递给弹窗

frontend/ruoyi-ui/src/views/business/school/components/ClassDialog.vue

@@ -16,8 +16,8 @@
         <el-checkbox-group v-model="form.classIds">
           <el-row :gutter="10">
             <el-col :span="8" v-for="item in classOptions" :key="item.value">
-              <el-checkbox :label="item.value" style="margin-bottom: 8px;">
-                {{ item.label }}
+              <el-checkbox :label="item.value" :disabled="item.disabled" style="margin-bottom: 8px;">
+                {{ item.label }}{{ item.disabled ? '（已添加）' : '' }}
               </el-checkbox>
             </el-col>
           </el-row>
@@ -56,6 +56,9 @@ const form = ref({
   classIds: []
 })
 
+// 已有班级ID列表
+const existingClassIds = ref([])
+
 // 获取班级选项
 const fetchClassOptions = async () => {
   try {
@@ -65,7 +68,7 @@ const fetchClassOptions = async () => {
       classOptions.value = (res.data || []).map(item => ({
         value: item.classId,
         label: item.className,
-        disabled: false
+        disabled: existingClassIds.value.includes(item.classId)
       }))
     }
   } catch (error) {
@@ -74,15 +77,19 @@ const fetchClassOptions = async () => {
 }
 
 // 打开弹窗
-// schoolData: { schoolId, schoolName, schoolGradeId, gradeName }
+// schoolData: { schoolId, schoolName, schoolGradeId, gradeName, existingClassIds }
 const open = (schoolData) => {
   dialogVisible.value = true
   currentSchool.value = schoolData
+  // 保存已有班级ID列表
+  existingClassIds.value = schoolData.existingClassIds || []
   form.value = {
     schoolId: schoolData.schoolId,
     schoolGradeId: schoolData.schoolGradeId,
     classIds: []
   }
+  // 重新获取班级选项（更新禁用状态）
+  fetchClassOptions()
 }
 
 // 提交表单

frontend/ruoyi-ui/src/views/business/school/components/GradeDialog.vue

@@ -16,8 +16,8 @@
         <el-checkbox-group v-model="form.gradeIds">
           <el-row :gutter="10">
             <el-col :span="8" v-for="item in gradeOptions" :key="item.value">
-              <el-checkbox :label="item.value" style="margin-bottom: 8px;">
-                {{ item.label }}
+              <el-checkbox :label="item.value" :disabled="item.disabled" style="margin-bottom: 8px;">
+                {{ item.label }}{{ item.disabled ? '（已添加）' : '' }}
               </el-checkbox>
             </el-col>
           </el-row>
@@ -55,6 +55,9 @@ const form = ref({
   gradeIds: []
 })
 
+// 已有年级ID列表
+const existingGradeIds = ref([])
+
 // 获取年级选项
 const fetchGradeOptions = async () => {
   try {
@@ -64,7 +67,7 @@ const fetchGradeOptions = async () => {
       gradeOptions.value = (res.data || []).map(item => ({
         value: item.gradeId,
         label: item.gradeName,
-        disabled: false
+        disabled: existingGradeIds.value.includes(item.gradeId)
       }))
     }
   } catch (error) {
@@ -76,10 +79,14 @@ const fetchGradeOptions = async () => {
 const open = (school) => {
   dialogVisible.value = true
   currentSchool.value = school
+  // 保存已有年级ID列表
+  existingGradeIds.value = school.existingGradeIds || []
   form.value = {
     schoolId: school.schoolId,
     gradeIds: []
   }
+  // 重新获取年级选项（更新禁用状态）
+  fetchGradeOptions()
 }
 
 // 提交表单

frontend/ruoyi-ui/src/views/business/school/index.vue

@@ -232,9 +232,15 @@ const handleEdit = (row) => {
 
 // 新增年级 - 学校下新增年级，选择对应的年级挂载
 const handleAddGrade = (row) => {
+  // 获取学校已有的年级ID列表
+  const existingGradeIds = (row.children || [])
+    .filter(child => child.type === 'grade')
+    .map(child => child.gradeId)
+  
   const schoolData = {
     schoolId: row.id,
-    schoolName: row.name
+    schoolName: row.name,
+    existingGradeIds: existingGradeIds
   }
   gradeDialogRef.value?.open(schoolData)
 }
@@ -243,11 +249,17 @@ const handleAddGrade = (row) => {
 const handleAddClass = (row) => {
   // 从 treeData 中查找学校名称
   const school = treeData.value.find(s => s.id === row.schoolId)
+  // 获取年级已有的班级ID列表
+  const existingClassIds = (row.children || [])
+    .filter(child => child.type === 'class')
+    .map(child => child.classId)
+  
   const schoolData = {
     schoolId: row.schoolId,
     schoolName: school ? school.name : '',
     schoolGradeId: row.id,
-    gradeName: row.name
+    gradeName: row.name,
+    existingClassIds: existingClassIds
   }
   classDialogRef.value?.open(schoolData)
 }