无法读取未定义的属性“值”

Question

我收到一条错误消息，上面写着 ERROR TypeError: Cannot read property 'value' of undefined. 我正在使用 Angular CLI、Typescript 和 HTML-Table。我检查了代码，但我认为它不是由拼写错误引起的。谁能帮我解决这个错误？

//function in typescript
updStudent(newName: string, newYear: string, newSemester: string, newScore: string) {
  this.stockService.updStudent(this.selectedStudent.id, newName, newYear, newSemester, newScore).subscribe;
}
loadStu(Student: any) {
  this.updateEnable = true;
  this.selectedStudent = Student;
}

<!--button-->
<button type="button" (click)="loadStu(Student)">UPDATE</button>
<hr>

<!--form-->
<div *ngIf="updateEnable">
  id: <input disabled [value]="selectedStudent.id" />
  <br>name: <input name="name" #updName [value]="selectedStudent.name" />
  <br>year: <input name="year" #updYear [value]="selectedStudent.year" />
  <br>semester: <input name="semester" #updSemester [value]="selectedStudent.semester" />
  <br>score: <input name="score" #updScore [value]="selectedStudent.score" />
  <br><button type="button" (click)="updStudent(updName.value, updYear.value, updSemester.value, UpdScore.value)">SAVE</button>
</div>

如果需要更多的 sn-ps，请告诉我。

谢谢。

Answer 1

错别字，请改

UpdScore.value

到

updScore.value