初始化

src/views/infra/demo/demo03/inner/components/Demo03GradeForm.vue

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+<template>
+  <el-form
+    ref="formRef"
+    :model="formData"
+    :rules="formRules"
+    label-width="100px"
+    v-loading="formLoading"
+  >
+    <el-form-item label="名字" prop="name">
+      <el-input v-model="formData.name" placeholder="请输入名字" />
+    </el-form-item>
+    <el-form-item label="班主任" prop="teacher">
+      <el-input v-model="formData.teacher" placeholder="请输入班主任" />
+    </el-form-item>
+  </el-form>
+</template>
+<script setup lang="ts">
+import { Demo03StudentApi } from '@/api/infra/demo/demo03/inner'
+
+const props = defineProps<{
+  studentId: number // 学生编号（主表的关联字段）
+}>()
+const formLoading = ref(false) // 表单的加载中
+const formData = ref<any>({})
+const formRules = reactive({
+  studentId: [{ required: true, message: '学生编号不能为空', trigger: 'blur' }],
+  name: [{ required: true, message: '名字不能为空', trigger: 'blur' }],
+  teacher: [{ required: true, message: '班主任不能为空', trigger: 'blur' }]
+})
+const formRef = ref() // 表单 Ref
+
+/** 监听主表的关联字段的变化，加载对应的子表数据 */
+watch(
+  () => props.studentId,
+  async (val) => {
+    // 1. 重置表单
+    formData.value = {
+      id: undefined,
+      studentId: undefined,
+      name: undefined,
+      teacher: undefined
+    }
+    // 2. val 非空，则加载数据
+    if (!val) {
+      return
+    }
+    try {
+      formLoading.value = true
+      const data = await Demo03StudentApi.getDemo03GradeByStudentId(val)
+      if (!data) {
+        return
+      }
+      formData.value = data
+    } finally {
+      formLoading.value = false
+    }
+  },
+  { immediate: true }
+)
+
+/** 表单校验 */
+const validate = () => {
+  return formRef.value.validate()
+}
+
+/** 表单值 */
+const getData = () => {
+  return formData.value
+}
+
+defineExpose({ validate, getData })
+</script>