I have encountered an issue in my Angular app where the array productLocations is being assigned in the ngOnInit method within a subscription, but it remains undefined when used in another method. Despite following advice on Stackoverflow to move the assignment into the subscription block, I still receive an error. How can I ensure that things are executed in the correct sequence?
ERROR TypeError: Cannot read property 'forEach' of undefined
at AddProductComponent.populateProductLocation
Component File
export class AddProductComponent implements OnInit, OnDestroy {
// Component properties and initialization code here
constructor(
private http: HttpClient,
private _formBuilder: FormBuilder,
private productManufacturerService: ProductManufacturerService,
private productModelService: ProductModelService,
private productCategoryService: ProductCategoryService,
private productService: ProductService,
private branchService: BranchService,
private router: Router,
private route: ActivatedRoute,
private _fuseProgressBarService: FuseProgressBarService,
private priceListService: PriceListService,
private cd: ChangeDetectorRef
) {
// Constructor logic here
}
ngOnInit(): void {
// Initialization code here
this._fuseProgressBarService.show();
if (this.editMode) {
// Code for edit mode
}
forkJoin([
this.productManufacturerService.getList(),
this.productModelService.getList(),
this.productCategoryService.getList(),
this.branchService.getList(),
this.priceListService.getList()
])
.subscribe((results: any) => {
// Subscription code here
},
error => { },
() => {
// Completion code here
});
}
// Form initialization and control methods here
initForm() {
// Form initialization code
}
initProductLocations() {
// Initialize product locations based on branches
}
populateProductLocations() {
// Populate product locations based on existing data
}
// Methods for initializing and populating price lists
get replaceNumbers(): FormArray {
return this.form.get('replaceNumbers') as FormArray;
}
// CRUD operations for replace numbers
// Method to populate update data
ngOnDestroy(): void {
// Clean-up code
}
}