so#43580683

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  isDoneWithHeavyWork: false,
  
  init() {
    this._super(...arguments);
    console.log('I am doing some serious stuff currently wait 3 seconds before showing me!');
    window.setTimeout(()=> {
      this.set('isDoneWithHeavyWork', true);
      this.get('doneInitializng')();
    }, 3000);
  }
});

components.my-component2.js

import Ember from 'ember';

export default Ember.Component.extend({
  isDoneWithHeavyWork: false,
  
  init() {
    this._super(...arguments);
    console.log('I am doing some serious stuff currently wait 10 seconds before showing me!');
    window.setTimeout(()=> {
      this.set('isDoneWithHeavyWork', true);
      this.get('doneInitializng')();
    }, 10000);
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  actions: {
    componentAtTabDoneInitializing(tabIndex) {
      this.set(`tab${tabIndex}FinishedInitializing`, true);
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#bs-tab customTabs=true as |tab|}}
   {{#bs-nav type="tabs" as |nav|}}
         {{#nav.item active=(bs-eq tab.activeId "edit")}}<a href="#pane1" role="tab" {{action tab.select "edit"}}>Tab 1</a>{{/nav.item}}
         {{#nav.item active=(bs-eq tab.activeId "edit2")}}<a href="#pane1" role="tab" {{action tab.select "edit2"}}>Tab 2 <span class="badge">{{badge}}</span></a>{{/nav.item}}
   {{/bs-nav}}
   <div class="tab-content">
   	{{#tab.pane elementId="edit" title="Edit"}}
    	{{#if tab1FinishedInitializing}}
      	<h2>TAB 1 Component DONE with initializing</h2>
      {{/if}}
   		{{my-component doneInitializng=(action 'componentAtTabDoneInitializing' 1)}}
		{{/tab.pane}}
    {{#tab.pane elementId="edit2" title="Edit2"}}
      {{#if tab2FinishedInitializing}}
      	<h2>TAB 2 Component DONE with initializing</h2>
      {{/if}}
      {{my-component2 doneInitializng=(action 'componentAtTabDoneInitializing' 2)}}
    {{/tab.pane}}
  </div>
{{/bs-tab}}
<br>
<br>

templates.components.my-component.hbs

{{yield}}
{{#if isDoneWithHeavyWork}}
	Great, I am done with the heavy work!!!
{{else}}
  Wait please; I am not done with heavy work at init that will t ake 3 seconds!!
{{/if}}

templates.components.my-component2.hbs

{{yield}}
{{#if isDoneWithHeavyWork}}
	Great, I am done with the heavy work!!!
{{else}}
  Wait please; I am not done with heavy work at init that will take 10 seconds!!
{{/if}}

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-bootstrap":"1.0.0-alpha.11"
  }
}