ion-spinner Component: Ionic 2

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Today lets see how we can use ion-spinner components and the animated SVG(Scalable Vector Graphics) it provides.

Using spinner components we can indicate the user that the data is being loaded in the background. This increases the usability and accessibility of the application and enhances the user experience.

loading image

Scalable Vector Graphics (SVG) is an XML-based vector image format for two-dimensional graphics with support for interactivity and animation. The SVG specification is an open standard developed by the World Wide Web Consortium (W3C) since 1999. SVG images and their behaviors are defined in XML text files.

Related Read:
setTimeout and setInterval methods: Ionic 2

ion-spinner Component: Ionic 2



YouTube Link: http://www.youtube.com/watch?v=rCwCsEcI3EU [Watch the Video In Full Screen.]



src/pages/home/home.ts

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { Data } from '../../providers/data';
 
@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {
  companies: any = 0;
  constructor(public navCtrl: NavController, public data: Data) {
    var temp = this;
  setTimeout(function(){ 
        temp.data.loadAll().then(result => {
            temp.companies =  result;
        });
    }, 3000);
  }
}

Here am using setTimeout method to induce 3 seconds or 3000 milliseconds of delay in assigning return value to the variable companies. Also note that I’ve initialized companies variable to zero.

src/pages/home/home.html

  < ion-spinner name="circles" *ngIf="companies == 0">
  < /ion-spinner>
  < ion-list *ngIf="companies != 0">
    < ion-item *ngFor="let Company of companies">
      {{Company.name}}
    < /ion-item>
  < /ion-list>

So there would be a delay of 3 seconds before the data is being loaded. So till then the value of variable companies will be zero. So we use *ngIf directive to show spinner until the value of companies stays zero. When it’s not zero(after 3 seconds) the list items are being displayed and the ion-spinner is removed from the DOM.

Styling – CSS
You can change the display property of the spinner using CSS styling.

src/pages/home/home.scss

ion-spinner * {
  width: 28px;
  height: 28px;
  stroke: #444;
  fill: #222;
}

stroke is the border property. Fill is background color property.

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