I'm currently developing an Angular 6 app and encountering an error when trying to inject a service into my component. The error message Uncaught Error: Can't resolve all parameters for ProductListComponent: (?) is not providing specific details, making it difficult to pinpoint the issue within the code. There are no errors showing up in my IDE. What could be causing this problem?
// Product-list component
import {
Component,
OnInit
} from '@angular/core';
import {
IProduct
} from './product';
import {
ProductService
} from './product.service';
@Component({
selector: 'pm-products',
templateUrl: './product-list.component.html',
styleUrls: ['./product-list.component.css']
})
export class ProductListComponent implements OnInit {
pageTitle: string = 'Product List';
imageWidth: number = 50;
imageMargin: number = 2;
showImage: boolean = true;
_listFilter: string = '';
get listFilter(): string {
return this._listFilter;
}
set listFilter(value: string) {
this._listFilter = value;
this.filteredProducts = this.listFilter ? this.performFilter(this.listFilter) : this.products;
}
filteredProducts: IProduct[];
products: IProduct[] = [];
constructor(private productService: ProductService) {
this.listFilter = 'cart';
}
OnRatingClicked(message: string): void {
this.pageTitle = `Product list: ${message}`;
}
performFilter(filterBy: string): IProduct[] {
filterBy = filterBy.toLocaleLowerCase();
return this.products.filter((product: IProduct) =>
product.productName.toLocaleLowerCase().indexOf(filterBy) !== -1);
}
toggleImage(): void {
this.showImage = !this.showImage;
}
ngOnInit(): void {
console.log('OnInit');
this.filteredProducts = this.products;
this.products = this.productService.getProducts();
}
}
// product service
import {
Injectable
} from '@angular/core';
import {
IProduct
} from './product';
@injectable({
providedIn: 'root'
});
export class ProductService {
getProducts(): IProduct[] {
return [{
"productId": 1,
"productName": "Leaf Rake",
"productCode": "GDN-0011",
"releaseDate": "March 19, 2016",
"description": "Leaf rake with 48-inch wooden handle.",
"price": 19.95,
"starRating": 3.2,
"imageUrl": "https://openclipart.org/image/300px/svg_to_png/26215/Anonymous_Leaf_Rake.png"
},
{
"productId": 2,
"productName": "Garden Cart",
"productCode": "GDN-0023",
"releaseDate": "March 18, 2016",
"description": "15 gallon capacity rolling garden cart",
"price": 32.99,
"starRating": 4.2,
"imageUrl": "https://openclipart.org/image/300px/svg_to_png/58471/garden_cart.png"
},
{
"productId": 5,
"productName": "Hammer",
"productCode": "TBX-0048",
"releaseDate": "May 21, 2016",
"description": "Curved claw steel hammer",
"price": 8.9,
"starRating": 4.8,
"imageUrl": "https://openclipart.org/image/300px/svg_to_png/73/rejon_Hammer.png"
},
{
"productId": 8,
"productName": "Saw",
"productCode": "TBX-0022",
"releaseDate": "May 15, 2016",
"description": "15-inch steel blade hand saw",
"price": 11.55,
"starRating": 3.7,
"imageUrl": "https://openclipart.org/image/300px/svg_to_png/27070/egore911_saw.png"
},
{
"productId": 10,
"productName": "Video Game Controller",
"productCode": "GMG-0042",
"releaseDate": "October 15, 2015",
"description": "Standard two-button video game controller",
"price": 35.95,
"starRating": 4.6,
"imageUrl": "https://openclipart.org/image/300px/svg_to_png/120337/xbox-controller_01.png"
}
]
}
}
// product interface
export interface IProduct {
productId: number;
productName: string;
productCode: string;
releaseDate: string;
description: string;
price: number;
starRating: number;
imageUrl: string;
}