Testing async behaviour - 1

components.async-image.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'img',
  attributeBindings: ['src'],
  
  simpleLoadImage() {
    let img = new Image();
    img.src = this.get('src');

    img.onload = () => {
      this.get('onImageLoad')();
    };
  },

  returnSwatchesOnInsert: Ember.on('didInsertElement', function() {
    Ember.run.scheduleOnce('afterRender', this, this.simpleLoadImage);
  })
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  imageLoaded: false,
  
  actions: {
    imageLoaded() {
      this.set('imageLoaded', true);
    }
  }
});

templates.application.hbs

<h1>Testing async behaviour</h1>
<h2>1 - Simple async example showing an example use case of image loading</h2>
<p>In this simple example use case we have a component which triggers an action when the image has finished loading</p>
<p>is image loaded: <strong>{{imageLoaded}}</strong></p>
{{async-image src='http://emberjs.com/images/tomsters/sandiego-zoey.png' onImageLoad=(action 'imageLoaded')}}

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.7.0",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.7.0"
  },
  "addons": {}
}