How to use private properties in my html-file? - html

Question

I am trying to show a list of Animals in my html page with their corresponding name and color.
My frontend gets the data from a spring backend that returns a list of Animals.
And I stumbled upon 2 questions that I have:
1)
I made the name and color properties private in the Animal class.
Code of the animal class:
interface AnimalJson {
name: string;
color: string;
}
export class Animal {
constructor(private name: string, private color: string) {}
static fromJSON(json: AnimalJson): Animal {
const a = new Animal(json.name, json.color);
return a;
}
}
code of my animal-component:
import { Component, OnInit } from '#angular/core';
import { Observable } from 'rxjs';
import { DataServiceService } from '../data-service.service';
import { Animal } from '../models/Animal';
#Component({
selector: 'app-animal',
templateUrl: './animal.component.html',
styleUrls: ['./animal.component.css'],
})
export class AnimalComponent implements OnInit {
public animals: Observable<Animal[]>;
constructor(private dataService: DataServiceService) {
this.animals = new Observable<Animal[]>();
}
ngOnInit(): void {
this.animals = this.dataService.getAnimals();
}
}
code of the service:
#Injectable({
providedIn: 'root',
})
export class DataServiceService {
constructor(private http: HttpClient) {}
getAnimals(): Observable<Animal[]> {
return this.http
.get<Animal[]>('http://localhost:8080/animals')
.pipe(map((animals: any[]): Animal[] => animals.map(Animal.fromJSON)));
}
}
code of the html-page:
<div *ngFor="let animal of animals | async">
<p>{{ animal.name }}</p>
</div>
Now when I try to get the animal.name, it gives an error that the name is private so I cant use it in my html page. How should I fix this? Should I just make it public? Or is there something I forget?
2)
Is this how you work with observables? Or am I using my observables in a wrong way?
Using the http get methode to get the observable and than call it in my animal-component and use async in my html-file to go over all the values in it?

Answer 1

If you use private then it should not be used in the html, am not sure why you are using a class for initializing the array. Just use a simple map statement.
If you are going to show it in the HTML then don't make the property private.
So the changes are.
interface Animal {
name: string;
color: string;
}
Service will be.
#Injectable({
providedIn: 'root',
})
export class DataServiceService {
constructor(private http: HttpClient) {}
getAnimals(): Observable<Animal[]> {
return this.http
.get<Animal[]>('http://localhost:8080/animals')
.pipe(map((animals: any[]): Animal[] => animals.map((item: Animal) => ({name: item.name, color: item.color}))));
}
}
Note: class can also be used as an interface, so when using animal you defined the properties as private, so you are unable to use in the HTML.