Angular TypeError:无法读取属性'；名称'；未定义的。角度7

您好，我正在尝试使用Angular 7提交一个只有一个字段的表单，但我在输入行中遇到以下错误：

错误类型错误：无法读取未定义的属性“Name”

我的HTML如下所示：

    <form #form="ngForm" autocomplete="off" (submit)="onSubmit(form)">
    <input type="hidden" name="Id" [value]="service.formData.Id">
    <div class="form-group" >
        <div class="input-group" *ngIf="service">
            <div class="input-group-prepend">
                <div class="input-group-text bg.white">
                        <i class="fas fa-user" [class.green-icon]="Name.valid" [class.red-icon]="Name.invalid && Name.touched"></i>
                </div>
            </div>
            <input name="Name" #Name="ngModel" [(ngModel)]="service.formData.Name" class="form-control" placeholder="Student Name" required maxlength="50">
        </div>
    </div>
    <hr>
    <div class="form-group">
        <button class="btn btn-success btn-lg btn-block" type="submit"><i class="fas fa-database"></i> Submit</button>
    </div>
</form>

import { Component, OnInit } from '@angular/core';
import { StudentDetailService } from 'src/app/shared/student-detail.service';
import { NgForm } from '@angular/forms';

@Component({
  selector: 'app-student-detail',
  templateUrl: './student-detail.component.html',
  styles: []
})
export class StudentDetailComponent implements OnInit {

  constructor(private service:StudentDetailService) { }

  ngOnInit() {
    this.resetForm();
  }

  resetForm(form?:NgForm)
  {
    if(form !=null){
      form.resetForm();
      this.service.formData = {
        Id :0,
        Name :'',
        StudentSubjects :null
      }
    }

  }

  onSubmit(form:NgForm)
  {
    this.service.postStudentDetail(form.value).subscribe(
      res => {
        this.resetForm(form);
      },
      err => {
        console.log(err)
      }
    );
  }
}

import { Injectable } from '@angular/core';
import { StudentDetail } from './student-detail.model';
import {HttpClient} from "@angular/common/http";

@Injectable({
  providedIn: 'root'
})
export class StudentDetailService {
  formData :StudentDetail;
  readonly rootURL = 'http://localhost:31047/api';

  constructor(private http: HttpClient) { }

  postStudentDetail(formData:StudentDetail)
  {
    return this.http.post(this.rootURL+'/StudentDetail',formData)
  }
}

还有这样的服务：

    <form #form="ngForm" autocomplete="off" (submit)="onSubmit(form)">
    <input type="hidden" name="Id" [value]="service.formData.Id">
    <div class="form-group" >
        <div class="input-group" *ngIf="service">
            <div class="input-group-prepend">
                <div class="input-group-text bg.white">
                        <i class="fas fa-user" [class.green-icon]="Name.valid" [class.red-icon]="Name.invalid && Name.touched"></i>
                </div>
            </div>
            <input name="Name" #Name="ngModel" [(ngModel)]="service.formData.Name" class="form-control" placeholder="Student Name" required maxlength="50">
        </div>
    </div>
    <hr>
    <div class="form-group">
        <button class="btn btn-success btn-lg btn-block" type="submit"><i class="fas fa-database"></i> Submit</button>
    </div>
</form>

import { Component, OnInit } from '@angular/core';
import { StudentDetailService } from 'src/app/shared/student-detail.service';
import { NgForm } from '@angular/forms';

@Component({
  selector: 'app-student-detail',
  templateUrl: './student-detail.component.html',
  styles: []
})
export class StudentDetailComponent implements OnInit {

  constructor(private service:StudentDetailService) { }

  ngOnInit() {
    this.resetForm();
  }

  resetForm(form?:NgForm)
  {
    if(form !=null){
      form.resetForm();
      this.service.formData = {
        Id :0,
        Name :'',
        StudentSubjects :null
      }
    }

  }

  onSubmit(form:NgForm)
  {
    this.service.postStudentDetail(form.value).subscribe(
      res => {
        this.resetForm(form);
      },
      err => {
        console.log(err)
      }
    );
  }
}

import { Injectable } from '@angular/core';
import { StudentDetail } from './student-detail.model';
import {HttpClient} from "@angular/common/http";

@Injectable({
  providedIn: 'root'
})
export class StudentDetailService {
  formData :StudentDetail;
  readonly rootURL = 'http://localhost:31047/api';

  constructor(private http: HttpClient) { }

  postStudentDetail(formData:StudentDetail)
  {
    return this.http.post(this.rootURL+'/StudentDetail',formData)
  }
}

我知道组件的“service”变量返回null，但当我在

ngOnInit（）

函数中打印时，该变量不为null。我尝试使用

*ngIf=“service”

命令但没有成功，因此我不知道为什么会显示此错误。有人知道我做错了什么

您正在尝试读取

服务.formData

的

名称

属性，该属性为空

而不是

*ngIf=“service”

do，

*nfIf=“service.formData”

在

resetForm

方法中，仅当参数不为null时，才初始化

this.service.formData

。在

ngOnInit（）

中，您正在调用不带参数的方法，因此formData将不会初始化。你需要先初始化它

---

您尚未在component init上初始化formData对象

在ngOnInit中重置表单之前初始化它，您的错误应该消失

ngOnInit() {
this.service.formData = {
        Id :0,
        Name :'',
        StudentSubjects :null
      }
this.resetForm();
}

---

您是否尝试过

*ngIf=“service.formData”

？@ConnorsFan当我这样做时，错误消失了，但我的表单也消失了。为什么您的模板中有服务调用？这是克里米亚人试过的。错误消失了，但文本字段也消失了。@YesidBejaranoCamacho我已经更新了，我的答案。请检查一下。