Pick Random Examples

components.pick-random.js

import Ember from 'ember';

const PickRandom = Ember.Component.extend({
  tagName: '',
  data: null,
  choice: null,
  
  init() {
    this._super();
    this.pick();
  },
  
  pick() {
    let data = this.get('data');
    let idx = Math.floor(Math.random() * data.length);
    this.set('choice', data[idx]);
  }
});

PickRandom.reopenClass({
  positionalParams: ['data']
});

export default PickRandom;

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  data: [1,2,3,4,5,6,7,8,9,10],
  choice: null,
  
  init() {
    this.pick();
  },
  
  pick() {
    let data = this.get('data');
    let idx = Math.floor(Math.random() * data.length);
    this.set('choice', data[idx]);
  }
});

templates.application.hbs

Logic defined on controller:

<button onclick={{action pick}}>{{choice}}</button>

<hr>

Generic, reusable component: 

{{#pick-random data as |num reload|}}
  <button onclick={{action reload}}>{{num}}</button>
{{/pick-random}}

templates.components.pick-random.hbs

{{yield choice (action pick)}}

twiddle.json

{
  "version": "0.8.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}