Angular 错误TS2339:属性';项目';不存在于类型';数据模型[]和#x27;
我收到以下错误消息: TS2339:类型“DataModel[]”上不存在属性“ITEMS” 我在IONIC/ANGULAR中工作,用一个模型做一个反应式表单,从HTTP获取数据 有模型(model.ts):Angular 错误TS2339:属性';项目';不存在于类型';数据模型[]和#x27;,angular,forms,ionic-framework,model,Angular,Forms,Ionic Framework,Model,我收到以下错误消息: TS2339:类型“DataModel[]”上不存在属性“ITEMS” 我在IONIC/ANGULAR中工作,用一个模型做一个反应式表单,从HTTP获取数据 有模型(model.ts): export class DataModel { public ITEMS: any[]; constructor(public NAME: string, public QUANTITY: Array<string>) { this.ITEM
export class DataModel {
public ITEMS: any[];
constructor(public NAME: string, public QUANTITY: Array<string>) {
this.ITEMS = [{NAME, QUANTITY}];
}
}
有完整的代码表单。page.ts
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)
})
);
});
}
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();
}
}
感谢您的帮助因为您将
公共数据库数据:数据模型[]
定义为一个数组,所以您应该将其视为一个数组
我猜您是想将其定义为publicdbdata:DataModel
,然后在调用this.dbData.ITEMS.forEach(element=>{
以下是全部更改:
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,你应该改变:
公共数据库数据:数据模型[];
->公共数据库数据:数据模型;
this.dbData=value
->this.dbData={ITEMS:value};
这是您可以在红色代码中看到的错误源代码
dbData是一个
DataModel[]
,您可以通过this.dbData.ITEMS
访问它,但它肯定不存在。因此,您必须
dbData : DataModel;
this.dbData.ITEMS...
或
我还注意到
DataModel
里面有一个数组,我想你是想有一个DataModel而不是数组什么是public dbData:DataModel[];
如果我这样声明public dbData:DataModel[];
或者像这样public dbData:DataModel;
我有同样的错误消息。更糟糕的是:(当声明为dbData:DataModel
时,您会遇到什么错误?error TS2322:Type'any[]不可分配给Type'DataModel'。
并且属性'ITEMS'在Type'any[]中丢失。
现在我收到了此错误消息error TS2322:Type'{ITEMS:any[];}'不可分配给类型“DataModel”。
和属性“NAME”在类型“{ITEMS:any[];}”中丢失。
如果要复制它并在angular或ionic下编译,则有代码:我创建了数据模型来创建dbData结构。我希望它看起来像这样:dbData:any={ITEMS:[{NAME:'',QUANTITY:['']};
因此定义您的dbData:DataModel=newdatamodel(''',[''])
我通过从订阅中获取如下值来解决问题this.obsubscription=this.storageService.dbSubject.subscripte((值:any)=>{}
而不是这样,它是this.obsSubscription=this.storageService.dbSubject.subject((值:any[])=>{}
我喜欢这样,如果不是这样,我在模板中得到了一个错误,因为异步数据非常感谢!!!
dbData : DataModel[];
this.dbData.forEach(dbItem => {
dbItem.ITEMS...
})