The forEach method is not valid for Response

Question

The forEach method is not valid for Response

Seeking assistance with my Angular project - a beginner in programming looking for guidance on retrieving images from a web API.

ASP.NET Framework Web API 4.7
Angular CLI: 13.3.7
Angular: 13.3.11

On the Web API side:

Controller:

[EnableCors(origins: "*", headers: "*", methods: "*")]
    public class HomeController : ApiController
    {
      // Code snippet here...
    }

Models:

HomeModel class:

// Code snippet here...

Motorcycle class:

// Code snippet here...

DTO class:

// Code snippet here...

On the Angular side:

Model:

home-categorised-bikes.model.ts:

// TypeScript code snippet here...

Service:

home-categorised-bikes.service.ts:

// TypeScript code snippet here...

app.component.ts:

// TypeScript code snippet here...

app.component.html:

<div class="container">
        <h4>{{title}}</h4>

        <div *ngFor="let bikeImg of bikesImgs">
            <img [src]="bikeImg">
        </div>

Swagger:

https://i.sstatic.net/Z1MRo.png

Error:

Response.forEach is not a function at AppComponent.onHomeBikesImgsResponse (app.component.ts)

Appreciate any help provided. Thank you.

c#angular typescript asp.net-web-api

Answer 1

Answer №1

Looking at the swagger screenshot provided, it's clear that your response does not consist of an array but rather a collection of objects such as streetBikes and sportBikes. Each of these objects contains a list of arrays.

In order to iterate through each property and consolidate all bike images into a single array, you can use the following code snippet:

function processBikeImages(response: any): void {
  for (const property in response) {
    response[property].forEach((item: ImageData) => {
      allBikeImages.push(`data:image/png;base64, ${item.image}`);
    });
  }
}

Answer 2

Looking at the swagger screenshot provided, it's clear that your response does not consist of an array but rather a collection of objects such as streetBikes and sportBikes. Each of these objects contains a list of arrays.

In order to iterate through each property and consolidate all bike images into a single array, you can use the following code snippet:

function processBikeImages(response: any): void {
  for (const property in response) {
    response[property].forEach((item: ImageData) => {
      allBikeImages.push(`data:image/png;base64, ${item.image}`);
    });
  }
}

Answer 3

Answer №2

Your API is designed to return a single response of type HomeModel, rather than an array of HomeModel.

home-categorised-bikes.service.ts:

export class HomeCategorisedBikesService {

  imageUrl = 'https://localhost:44377/api/Home';

  constructor(private http: HttpClient) { }

  getImg(): Observable<HomeModel> {
    return this.http.get<HomeModel>(this.imageUrl);
  }
}

app.component.ts:

private processHomeBikeImagesResponse(Response: HomeModel): void {
  Response.sportBikes.forEach((img: FromDTOImgs) => {
    this.bikesImages.push(`data:image/png;base64,${img.image}`);
  });

  Response.streetBikes.forEach((img: FromDTOImgs) => {
    this.bikesImages.push(`data:image/png;base64,${img.image}`);
  });

  Response.adventureBikes.forEach((img: FromDTOImgs) => {
    this.bikesImages.push(`data:image/png;base64,${img.image}`);
  });

  Response.scooterBikes.forEach((img: FromDTOImgs) => {
    this.bikesImages.push(`data:image/png;base64,${img.image}`);
  });
}

Answer 4

Your API is designed to return a single response of type HomeModel, rather than an array of HomeModel.

home-categorised-bikes.service.ts:

export class HomeCategorisedBikesService {

  imageUrl = 'https://localhost:44377/api/Home';

  constructor(private http: HttpClient) { }

  getImg(): Observable<HomeModel> {
    return this.http.get<HomeModel>(this.imageUrl);
  }
}

app.component.ts:

private processHomeBikeImagesResponse(Response: HomeModel): void {
  Response.sportBikes.forEach((img: FromDTOImgs) => {
    this.bikesImages.push(`data:image/png;base64,${img.image}`);
  });

  Response.streetBikes.forEach((img: FromDTOImgs) => {
    this.bikesImages.push(`data:image/png;base64,${img.image}`);
  });

  Response.adventureBikes.forEach((img: FromDTOImgs) => {
    this.bikesImages.push(`data:image/png;base64,${img.image}`);
  });

  Response.scooterBikes.forEach((img: FromDTOImgs) => {
    this.bikesImages.push(`data:image/png;base64,${img.image}`);
  });
}

The forEach method is not valid for Response

Answer №1

Answer №2

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