Angular Http Promise return undefined

Question

Just trying to set my component property from a http result but no success. Thank for your help ! (working with a static mock object)

Class - Object

export class Gallery {
    name: string;
}

Service

import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import 'rxjs/Rx';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import { Gallery } from './GalleryModel';


@Injectable()
export class GalleryLoadService {

    private galleryUrl = 'api/Gallery/Get'; 

    constructor(private http: Http) {
    }


    getGalleries(): Promise<Gallery[]> {
        return this.http.get(this.galleryUrl)
            .toPromise()
            .then(response => response.json().data as Gallery[])
            .catch(this.handleError);
    }

    private handleError(error: any): Promise<any> {
        console.error('An error occurred', error); 
        return Promise.reject(error.message || error);
    }
}

Component

import { Component, OnInit } from '@angular/core';
import { Gallery } from './GalleryModel';
import { GalleryLoadService } from './gallery-services';


@Component({
    selector: 'my-gallery',
    templateUrl: 'gallery-component.html',
    moduleId: module.id 
})
export class GalleryComponent implements OnInit {
    galleries: Gallery[];

    constructor(private galleryService: GalleryLoadService) {
    }

    ngOnInit(): void {
        this.getGals();
    }

    getGals(): void {

        this.galleryService
            .getGalleries()
            .then(gals => {
            this.galleries = gals;
            console.log(this.galleries); <=== TypeError: gals is undefined!!!!!
            });
    }      
}

console.log return TypeError: gals is undefined!!!!!

API call result

[{"name":"Cats"},{"name":"Dogs"}]

Saravana · Accepted Answer · 2017-05-31 02:18:21Z

2

If that is the result you get from the API, then you should not be using response.json().data in your getGalleries method since there is no data property. Remove the data:

.then(response => response.json() as Gallery[])

See the documentation:

Make no assumptions about the server API. Not all servers return an object with a data property.

answered May 31, 2017 at 2:18

Saravana

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1 Comment

atomik Over a year ago

You made my day ! Thank you !

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