refactor(teacher/checkinPage): 重构下拉菜单变量名并添加筛选逻辑

重构年级、班级和课程下拉菜单的变量名，使其更具语义化。同时为每个下拉菜单的变更事件添加数据重置和重新加载逻辑，以支持筛选功能。

 <!--
   * @Date: 2025-05-29 15:34:17
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-06-24 16:40:27
+ * @LastEditTime: 2025-06-24 16:56:33
  * @FilePath: /mlaj/src/views/teacher/checkinPage.vue
   * @Description: 文件描述
 -->
@@ -10,9 +10,9 @@
     <van-config-provider :theme-vars="themeVars">
       <van-sticky>
         <van-dropdown-menu active-color="#4caf50">
-          <van-dropdown-item v-model="value1" :options="option1" @change="handleChange1" />
-          <van-dropdown-item v-model="value2" :options="option2" @change="handleChange2" />
-          <van-dropdown-item v-model="value3" :options="option3" @change="handleChange3" />
+          <van-dropdown-item v-model="selectGradeValue" :options="gradeOption" @change="handleGradeChange" />
+          <van-dropdown-item v-model="selectClassValue" :options="classOption" @change="handleClassChange" />
+          <van-dropdown-item v-model="selectCourseValue" :options="courseOption" @change="handleCourseChange" />
         </van-dropdown-menu>
       </van-sticky>
 
@@ -251,35 +251,56 @@ const currentCommentPost = ref(null)
 const showAuditDialog = ref(false)
 const currentAuditPost = ref(null)
 
-const value1 = ref(0);
-const value2 = ref('a');
-const value3 = ref('v');
-const option1 = [
+const selectGradeValue = ref(0);
+const selectClassValue = ref('a');
+const selectCourseValue = ref('v');
+const gradeOption = [
   { text: '全部年级', value: 0 },
   { text: '一年级', value: 1 },
   { text: '二年级', value: 2 },
 ];
-const option2 = [
+const classOption = [
   { text: '全部班级', value: 'a' },
   { text: '一班级', value: 'b' },
   { text: '二班级', value: 'c' },
 ];
-const option3 = [
+const courseOption = [
   { text: '全部课程', value: 'v' },
   { text: '一课程', value: 'b' },
   { text: '二课程', value: 'c' },
 ];
 
-const handleChange1 = (val) => {
+const handleGradeChange = (val) => {
   console.log('val', val);
+  selectGradeValue.value = val;
+  // 重置分页参数
+  page.value = 0
+  checkinDataList.value = []
+  finished.value = false
+  // 重新加载数据
+  onLoad()
 }
 
-const handleChange2 = (val) => {
+const handleClassChange = (val) => {
   console.log('val', val);
+  selectClassValue.value = val;
+  // 重置分页参数
+  page.value = 0
+  checkinDataList.value = []
+  finished.value = false
+  // 重新加载数据
+  onLoad()
 }
 
-const handleChange3 = (val) => {
+const handleCourseChange = (val) => {
   console.log('val', val);
+  selectCourseValue.value = val;
+  // 重置分页参数
+  page.value = 0
+  checkinDataList.value = []
+  finished.value = false
+  // 重新加载数据
+  onLoad()
 }
 
 const active = ref(0);
@@ -802,7 +823,10 @@ const onLoad = async (date) => {
     limit: limit.value,
     page: nextPage,
     task_id: route.query.id,
-    date: current_date
+    date: current_date,
+    grade: selectGradeValue.value,
+    class_id: selectClassValue.value,
+    course_id: selectCourseValue.value,
   });
   if (res.code) {
     // 整理数据结构