A guide to looping through API data with ngFor in Angular 2

I'm a beginner in Angular 2 and I am looking to present all the API data in a tabular format. Below is the code that is currently working for me:

http://plnkr.co/edit/CB3oGppm4fvoEExfDSRc?p=preview

However, when I implement this code in my files, I encounter an error:

Type 'Response' is not assignable to type 'any[]'

test.component.html:

<h1>{{getData[0]?.name}}</h1>
<h1>{{getData[0]?.time}}</h1>
<div *ngFor="let item of getData">
  <span>{{item?.name}}</span>
</div>

app.component.ts

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

import { ConfigurationService } from './ConfigurationService';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html'
})

export class AppComponent {
  getData = [];

   constructor(private _ConfigurationService: ConfigurationService)
    {
        console.log("Reading _ConfigurationService ");
        //console.log(_ConfigurationService.getConfiguration());

         this._ConfigurationService.getConfiguration()
            .subscribe(
            (data)=> {
                this.getData = data; 
                console.log(this.getData);
            },
            (error) => console.log("error : " + error)
        );
    }
}

The code functions correctly in Plunkr, but I am encountering errors when trying it in my own project. Any assistance on how to iterate through the API values in my project would be greatly appreciated. Thank you.

Answer №1

The reason for the error is because the type has not been assigned to the variable getData. To fix this issue, you can update getData = []; to getData: any = [];, which should resolve the problem. Another option is to modify the compiler settings in the tsconfig.json file:

"compilerOptions": {
    "noImplicitAny": false
}

By setting noImplicitAny to false, you won't need to explicitly assign types to variables. If a variable's type is not explicitly defined, it will default to any.

Answer №2

When defining your service method getConfiguration, ensure the signature is as follows:

(): Observable<Response>

If the return type is not correct, update it to reflect the type that the Observable will materialize. For example:

(): Observable<any[]>

You have the option to specify a more specific type instead of using just any.

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