How to display a single JavaScript Object / JSON item from API Call

Question

I get data from an API Call that I already managed to display in a table. Now, when you click on some Item of the table I want to show a more detailled view of this item.

So when I open the link localhost:4200/detail/12 I want to display data from the object with the id=12. But I cannot figure out how to do this.

I currently get the id of the selected person like this from the people.component.html

...
        <tr *ngFor="let data of data" routerLink="/detail/{{data.person_id}}">
            <td>{{data.person_id}}</td>
            <td>{{data.name}}</td>
        </tr>
...

The data of the API is in JSON format:

[{"person_id":"1","name":"Tom"},{"person_id":"2","name":"Clarissa"},{"person_id":"4","name":"Micky"},...]

but the displayed (in the Browser) data is logged as JavaScript Objects:

0:
   person_id: 1
   name: "Tom"
2:
   person_id: 2
   name: "Clarissa"
3:
   person_id: 4
   name: "Micky"
...

So how do I have to adapt the people-detail.component.ts and people-detail.component.html to display just the data of the selected Item (eg with the person_id=12) instead of all the items (that is what happens currently)?

This is how my people-detail.component.ts currently looks like

...
export class PeopleDetailComponent implements OnInit {
public data: any = []
  constructor(
    public http: HttpClient, 
    private route: ActivatedRoute) { }

getData(){
    const person_id = +this.route.snapshot.paramMap.get('person_id');
    const url ='http://localhost:4000/api/allpeople'
    this.http.get(url).subscribe
      (data => this.data = data);
  }

  ngOnInit() : void{
    this.getData()
  }

and this is my current people-detail.component.html:

<div *ngFor="let data of data">
    <div>
        <span>id1: </span>
        {{data.regulation_id}}
    </div>
</div>

Answer 1

I would go with using a resolver.

Routing

First declare the route of the detailed view:

const routes: Routes = [
  {
    path: 'detail/:id',
    component: PersonComponent,
    resolve: { message: PersonResolver }
  }
];

Resolver

You can use the resolver wherever you want to get a person details (reusable way to get data before loading the component

Then create the resolver on the route:

import { Injectable } from '@angular/core';
import { Resolve, ActivatedRoute, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';

import { of } from "rxjs";
import { delay } from "rxjs/operators";

@Injectable()
export class PersonResolver implements Resolve<Person> {

  constructor(private route: ActivatedRoute) {
  }

  resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot){
    const id = route.paramMap.get('id');
    const url = 'your url here';
    return this.http.get(url);
  }

}

Extra details

• I assume that you need to create the PersonComponent with the person details to go to after you click on a person.
• I assume that you want to show details on another component as you are going with another url.

Show inline version

You can also take a look at this for selecting inline stackblitz

Answer 2

You must create interface for data:

export interface iUsers {
    person_id: string;
    name: string;
}

then you must change your code to:

public data: iUsers[]  = []
 this.http.get<iUsers[]>(url).subscribe((res)=>{
    this.data = res
    console.log(this.data)
    })

Answer 3

setup an click listener as follow.

    <table>
<thead>
    <tr>
        <th>ID</th>
        <th>Name</th>
    </tr>
</thead>
<tbody>
    <tr *ngFor="let data of data" (click)="onClickHandler(data.person_id)">
        <td>{{data.person_id}}</td>
        <td>{{data.name}}</td>
    </tr>
</tbody>
</table>

this will pass the id of selected item into the handler method.the object havid the selected id will be stored in the "selected" variable.

onClickHandler(id)
{
    this.selected=this.data.find(item=>{
    if(item['id']===id)
    {
        return true;
    }
    return false;
});
}