What are the steps to resolve routing issues within an Angular component integrated into an ASP.NET Core web application?

When it comes to routing in Angular, I have been following the Angular tutorial from documentation. My example application integrates Angular components with an ASP.NET Core 2.2 web app, and these components are displayed within .cshtml views.

I use Angular component selectors in my ASP.NET Core views, like in the index.cshtml file where all Angular views are rendered:

Index View

<current-time></current-time>
<app-top-bar></app-top-bar>
<app-product-list></app-product-list>

Everything was being displayed correctly until I tried to add routing to the ProductListComponent in the product-list.component.html:

    <h2>Products</h2>

<div *ngFor="let product of products">

  <h3>
    <a [title]="product.name + ' details'" [routerLink]="['/products', product.productId]">
      {{ product.name }}
    </a>
  </h3>

  <p *ngIf="product.description">
    Description: {{ product.description }}
  </p>

  <button (click)="share()">
    Share
  </button>

  <app-product-alerts [product]="product"
                      (notify)="onNotify()">
  </app-product-alerts>

</div>

The issue arises when hovering over product in the product-list view as instead of receiving the anchor path

http://localhost:59119/products/1
, I get
http://localhost:59119/products/undefined
.

Additionally, navigating to

http://localhost:59119/products/1
results in a 404 error. It seems like there might be a problem related to not having bootstrap: [ AppComponent] defined in the app.module.ts.

Despite displaying Angular views using .cshtml files, is there a way to fix the navigation to the product details?

product-details.component.ts:

import { Component, OnInit } from '@angular/core';
import { ActivatedRoute } from '@angular/router';

import { products } from '../products';

@Component({
  selector: 'app-product-details',
  templateUrl: './product-details.component.html',
  styleUrls: ['./product-details.component.css']
})
export class ProductDetailsComponent implements OnInit {
  product;

  constructor(
    private route: ActivatedRoute,
  ) { }

  ngOnInit() {
    this.route.paramMap.subscribe(params => {
      this.product = products[+params.get('productId')];
    });
  }

}

products.ts:

export const products = [
  {
    productId: 1,
    name: 'Phone XL',
    price: 799,
    description: 'A large phone with one of the best screens'
  },
  {
    productId: 2,
    name: 'Phone Mini',
    price: 699,
    description: 'A great phone with one of the best cameras'
  },
  {
    productId: 3,
    name: 'Phone Standard',
    price: 299,
    description: ''
  }
];

product-list.component.ts:

import { Component, OnInit } from '@angular/core';

import { products } from '../products';

@Component({
  selector: 'app-product-list',
  templateUrl: './product-list.component.html',
  styleUrls: ['./product-list.component.css']
})
export class ProductListComponent implements OnInit {
  products = products;

  share() {
    window.alert('The product has been shared!');
  }

  onNotify() {
    window.alert('You will be notified when the product goes on sale');
  }

  constructor() { }

  ngOnInit() {
  }
}

Answer №1

When it comes to the initial inquiry that was posed and resulted in an undefined outcome,

The URL registered was http://localhost:59119/products/undefined

To rectify this issue, modifications need to be made within your html code -

<div *ngFor="let product of products">

  <h3>
    <a [title]="product.name + ' details'" [routerLink]="['/products', productId]">
      {{ product.name }}
    </a>
  </h3>(...)

</div>

The root cause of the error lies in the fact that productId has not been defined.

In regards to the subsequent query where a 404 error is encountered, the issue arises from the following snippet:

{ path: 'products/:productId', component: ProductDetailsComponent },

Attributed to this specific pathway, ProductDetailsComponent has been designated as the corresponding component, but it should be noted that Angular does not navigate to cshtml files for routing purposes.

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