How to use saved data in Ionic/Angular?

Issue

I can only use my variable inside the this.storage.get function.

How do I get this saved data?

tab2.page.html:

  <ion-toolbar>
    <ion-title>
      Stats
    </ion-title>
  </ion-toolbar>
</ion-header>

<ion-content>

<ion-card>
    <ion-card-header>
    Bar Chart
    </ion-card-header>
    <ion-card-content>
    <canvas #barCanvas></canvas>
    </ion-card-content>
</ion-card>

</ion-content>

tab2.page.ts:

import { Chart } from "chart.js";
import { Storage } from '@ionic/storage';

@Component({
  selector: 'app-tab2',
  templateUrl: 'tab2.page.html',
  styleUrls: ['tab2.page.scss']
})
export class Tab2Page implements OnInit {

  constructor(public storage:Storage) {}

  @ViewChild("barCanvas") barCanvas: ElementRef;

  h: any;
  a: any;
  s: any;
  e: any;
  w: any;

  ngOnInit() {

    this.storage.get('happiness').then( (val) => {
       this.h = val;
       console.log(this.h, val)
    })
    this.storage.get('anger').then( (val) => {
       this.a = val;
       console.log(this.a, val)
    })
    this.storage.get('stress').then( (val) => {
       this.s = val;
       console.log(this.s, val)
    })
    this.storage.get('energy').then( (val) => {
       this.e = val;
       console.log(this.e, val)
    })
    this.storage.get('worry').then( (val) => {
       this.w = val;
       console.log(this.w, val)
    })

    console.log(this.h, this.a, this.s, this.e, this.w)

    this.barChart = new Chart(this.barCanvas.nativeElement, {
      type: "bar",
      data: {
        labels: ["Happiness", "Anger", "Stress", "Energy", "Worry"],
        datasets: [
          {
            label: "% out of 100",
            data: [this.h, this.a, this.s, this.e, this.w],
            backgroundColor: [
              "rgba(255, 99, 132, 0.2)",
              "rgba(54, 162, 235, 0.2)",
              "rgba(255, 206, 86, 0.2)",
              "rgba(75, 192, 192, 0.2)",
              "rgba(153, 102, 255, 0.2)"
            ],
            borderColor: [
              "rgba(255,99,132,1)",
              "rgba(54, 162, 235, 1)",
              "rgba(255, 206, 86, 1)",
              "rgba(75, 192, 192, 1)",
              "rgba(153, 102, 255, 1)"
            ],
            borderWidth: 2
          }
        ]
      },
      options: {
        scales: {
          yAxes: [
            {
              ticks: {
                beginAtZero: true,
                stepSize: 20
              }
            }
          ]
        }
      }
    });
  }
}

Solution

use localStorage instead of Ionic Storage.

• Set Data localStorage.setItem('key', value)
• Get Data localStorage.getItem('key')

Answered By - Aashish Chakravarty