Confirms and Prompts with Tasks

controllers.application.js

import Ember from 'ember';
import { task, waitForProperty, timeout } from 'ember-concurrency';

const promptTask = task({
  answer: undefined,

  * perform() {
    yield waitForProperty(this, 'answer', a => a !== undefined);
    return this.answer;
  }
});

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  main: task(function * () {
    let confirmed = yield this.confirm.perform();
    
    if (!confirmed) {
      return;
    }
    
    let name = yield this.promptForName.perform();
    
    yield this.work.perform(name);
  }),
  
  confirm: promptTask,
  promptForName: promptTask,
  
  work: task({
    name: null,
    
    * perform(name) {
      this.set('name', name);
      yield timeout(3000);
    }
  })
});

styles.app.css

@keyframes fade {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

.pulse {
  animation: 0.5s infinite alternate fade;
}

templates.application.hbs

{{#unless main.isRunning}}
  <button onclick={{perform main}}>Work</button>
{{/unless}}

{{#if confirm.isRunning}}
  Are you sure?
  <button onclick={{action (mut confirm.last.answer) true}}>Yes</button>
  <button onclick={{action (mut confirm.last.answer) false}}>No</button>
{{/if}}

{{#if promptForName.isRunning}}
  <form onsubmit={{action (mut promptForName.last.answer) value="target.name.value"}}>
    <input type="text" placeholder="What shall I work on? (e.g. homework)" id="name" name="name" size=42>
    <button type="submit">Start</button>
  </form>
{{/if}}

{{#if work.isRunning}}
	<div class="pulse">Working on {{work.last.name}}…</div>
{{/if}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2",
    "ember-concurrency": "0.8.19"
  }
}