Issues arise when attempting to extract data from a data provider using JSON within the context of the Ionic framework

Hey there! I'm relatively new to the world of Angular and Ionic, and I've embarked on a project to create a pokedex app. My approach involves using a JSON file containing an array of "pocket monsters". However, my current challenge lies in extracting this information from the JSON file and displaying it successfully. Unfortunately, all I see when running the application is a list of numbers instead of the desired content. Could someone lend a hand and point me in the right direction? To provide more context, I will include the data provider, JSON file, and the components and templates related to the home page.

<ion-header>
                    <ion-navbar>
                        <ion-title>
                            Pokedex
                        </ion-title>
                    </ion-navbar>
                </ion-header>

                <ion-content>

                    <ion-list>
                        <ion-item *ngFor="let pocketMonster of pocketMonsters; let i = index;">
                            <ion-label>{{i+1}}</ion-label>
                        </ion-item>
                    </ion-list>
  
                    <!--<div *ngIf="pocketMonsters.length"></div> -->

                </ion-content>
            

import { Component } from '@angular/core';
                    import { ModalController, NavController } from 'ionic-angular';

                    import { pokemonDataService } from '../../providers/data/data';

                    @Component({
                        selector: 'page-home',
                        templateUrl: 'home.html'
                    })

                    export class HomePage {

                        pocketMonsters = [];
                        searchQuery: string = '';

                        constructor(public navCtrl: NavController, public dataService: pokemonDataService) {}

                        ionViewDidLoad() {
                            this.dataService.getAllPokemon().then((data) => {
                                data.map((pocketMonster) => {
                                    return pocketMonster;
                                });    
                                this.pocketMonsters = data;
                            });
                        }
                    }
            

import { Injectable } from '@angular/core';
                    import { Http, Response } from '@angular/http';
                    import 'rxjs/add/operator/map';

                    @Injectable()
                    export class pokemonDataService {
                    
                        data: any;
                    
                        constructor(public http: Http) {}

                        getAllPokemon() {
                            if(this.data){
                                return Promise.resolve(this.data);
                            }

                            return new Promise(resolve => {
                                this.http.get('assets/data/pokemon.json').map(res => res.json()).subscribe(data => {
                                    this.data = data.pocketMonsters;
                                    resolve(this.data);
                                });

                            });
                        }
                    }
            

{
                    "pocketMonsters": [
                        {
                            "pokemonName" : "Bulbasaur",
                            "pokedexNumber" : "001",
                            "description": "Bulbasaur can be seen napping in bright sunlight. There is a seed on its back. By soaking up the sun's rays, the seed grows progressively larger",
                            "pokemonImage" : "<img src='assets/imgs/bulbasaur.png"
                        },
                        {
                            "pokemonName" : "Ivysaur",
                            "pokedexNumber" : "002",
                            "description" : "",
                            "pokemonImage" : "<img src='assets/imgs/ivysaur.png"
                        }
                    ]
                 }
            

Answer №1

you are returning function so it does not work

import { Component } from '@angular/core';
import { ModalController, NavController } from 'ionic-angular';

import { pokemonDataService } from '../../providers/data/data';

@Component({
    selector: 'page-home',
    templateUrl: 'home.html'
})

export class HomePage {
  pocketMonsters = [];
  searchQuery: string = '';

  constructor(public navCtrl: NavController, public dataService:pokemonDataService) {}

  ionViewDidLoad() {    
       this.dataService.getAllPokemon().then((data) => {    
           data.map((pocketMonster) => {
           > this.pocketMonsters = data;
               return pocketMonster;    
           });    
       });    
   }
}

Answer №2

After some experimenting, I managed to solve my issue. By using {{pocketMonster....}}, I was able to successfully retrieve the necessary data from each object. For instance, {{pocketMonster.pokemonName}}.

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