Question

我收到此错误消息： TS2339：类型“ DataModel []”上不存在属性“ ITEMS”

我正在使用IONIC / ANGULAR，并使用模型进行反应形式，并从HTTP获取数据。

存在模型（model.ts）：

export class DataModel {
    public ITEMS: any[];

    constructor(public NAME: string, public QUANTITY: Array<string>) {
        this.ITEMS = [{NAME, QUANTITY}];
    }
}

form.page.ts

中存在错误的代码部分

  setItems() {
    const control = this.itemsForm.controls.items as FormArray;
    this.dbData.ITEMS.forEach(element => {
      control.push(
        this.formBuilder.group({
          name: element.NAME,
          quantity: this.setItem(element)
        })
      );
    });
  }

有完整的代码表单。page.ts

export class Form2Page implements OnInit, OnDestroy {
  obsSubscription: Subscription;
  itemsForm: FormGroup;

  public dbData: DataModel[];


  constructor(
    private formBuilder: FormBuilder,
    private storageService: FormStorageService
  ) {}

  ngOnInit() {
    // Get data from DB
    this.storageService.getDBData();
    this.obsSubscription = this.storageService.dbSubject.subscribe(
      (value: any[]) => {
        this.dbData = value;

    // Creating the FORM
        this.initForm();
        this.setItems();
      },
      error => {
        console.log('erreur');
        console.log(error);
      }
    );
  }

  initForm() {
    this.itemsForm = new FormGroup({
      items: new FormArray([])
    });
  }

  setItems() {
    const control = this.itemsForm.controls.items as FormArray;
    this.dbData.ITEMS.forEach(element => {
      control.push(
        this.formBuilder.group({
          name: element.NAME,
          quantity: this.setItem(element)
        })
      );
    });
  }

  setItem(value) {
    const array = new FormArray([]);
    value.QUANTITY.forEach(element => {
      array.push(this.formBuilder.control(element));
    });
    return array;
  }

  findFieldArray(field: any): FormArray {
    return this.itemsForm.get(field) as FormArray;
  }

  addNewItems() {
    const control = this.itemsForm.controls.items as FormArray;
    control.push(
      this.formBuilder.group({
        name: '',
        quantity: this.formBuilder.array([this.formBuilder.control('')])
      })
    );
  }

  addNewItem(item: FormGroup) {
    (item.get('quantity') as FormArray).push(this.formBuilder.control(''));
  }

  removeItem(item: FormGroup, qtyIndex: number, itemIndex: number) {
    (item.get('quantity') as FormArray).removeAt(qtyIndex);
  }

  removeItems(itemIndex: number) {
    const form = this.itemsForm.get('items') as FormArray;
    form.removeAt(itemIndex);
  }

  checkArray(itemIndex: number) {
        // Get the quantity array lenght to display the remove ITEMS button
        return ((this.itemsForm.get('items') as FormArray)
        .at(itemIndex)
        .get('quantity') as FormArray).length;
  }

  onFormSubmit() {
    console.log('Submit : ', this.itemsForm.value);
  }

  ngOnDestroy() {
    this.obsSubscription.unsubscribe();
  }
}

感谢您的帮助

Answer 1

由于您将public dbData: DataModel[]定义为数组，因此应将其视为一个数组。

我的猜测是您打算将其定义为public dbData: DataModel，然后在您致电this.dbData.ITEMS.forEach(element => {时就可以使用

这是完整的更改：

export class Form2Page implements OnInit, OnDestroy {
  obsSubscription: Subscription;
  itemsForm: FormGroup;

  public dbData: DataModel;  // #1 change


  constructor(
    private formBuilder: FormBuilder,
    private storageService: FormStorageService
  ) {}

  ngOnInit() {
    // Get data from DB
    this.storageService.getDBData();
    this.obsSubscription = this.storageService.dbSubject.subscribe(
      (value: any[]) => {
        this.dbData = { ITEMS: value };  // #2 change

    // Creating the FORM
        this.initForm();
        this.setItems();
      },
      error => {
        console.log('erreur');
        console.log(error);
      }
    );
  }

  initForm() {
    this.itemsForm = new FormGroup({
      items: new FormArray([])
    });
  }

  setItems() {
    const control = this.itemsForm.controls.items as FormArray;
    this.dbData.ITEMS.forEach(element => {
      control.push(
        this.formBuilder.group({
          name: element.NAME,
          quantity: this.setItem(element)
        })
      );
    });
  }

  setItem(value) {
    const array = new FormArray([]);
    value.QUANTITY.forEach(element => {
      array.push(this.formBuilder.control(element));
    });
    return array;
  }

  findFieldArray(field: any): FormArray {
    return this.itemsForm.get(field) as FormArray;
  }

  addNewItems() {
    const control = this.itemsForm.controls.items as FormArray;
    control.push(
      this.formBuilder.group({
        name: '',
        quantity: this.formBuilder.array([this.formBuilder.control('')])
      })
    );
  }

  addNewItem(item: FormGroup) {
    (item.get('quantity') as FormArray).push(this.formBuilder.control(''));
  }

  removeItem(item: FormGroup, qtyIndex: number, itemIndex: number) {
    (item.get('quantity') as FormArray).removeAt(qtyIndex);
  }

  removeItems(itemIndex: number) {
    const form = this.itemsForm.get('items') as FormArray;
    form.removeAt(itemIndex);
  }

  checkArray(itemIndex: number) {
        // Get the quantity array lenght to display the remove ITEMS button
        return ((this.itemsForm.get('items') as FormArray)
        .at(itemIndex)
        .get('quantity') as FormArray).length;
  }

  onFormSubmit() {
    console.log('Submit : ', this.itemsForm.value);
  }

  ngOnDestroy() {
    this.obsSubscription.unsubscribe();
  }
}

最后，您应该更改：

public dbData: DataModel[];-> public dbData: DataModel;

this.dbData = value-> this.dbData = { ITEMS: value };

Answer 2

dbData是DataModel[]，您以this.dbData.ITEMS的身份访问它（肯定不存在）。所以要么必须

dbData : DataModel;

this.dbData.ITEMS...

或

dbData : DataModel[];

this.dbData.forEach(dbItem => {

   dbItem.ITEMS...
})

我还注意到DataModel里面有一个数组，我想你的意思是要有一个DataModel而不是一个数组

Answer 3

这是源代码，其中的错误在红色中可以看到。

Source Code with the error

错误TS2339：类型“ DataModel []”上不存在属性“ ITEMS”

3 个答案: