olenderhub

components.messages-modal.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.render-active-modal.js

import Ember from 'ember';

export default Ember.Component.extend({
  modalService: Ember.inject.service('modal'),
  modal: Ember.computed.alias('modalService.modal')
});

components.render-modal.js

import Ember from 'ember';

const RenderModalComponent = Ember.Component.extend({
  modalService: Ember.inject.service('modal'),
  
  init: function() {
    this._super.apply(this, arguments);
    this.set('modalService.modal', this.get('modal'));
  },
  
  willDestroy: function() {
    this._super.apply(this, arguments);
    this.set('modalService.modal', null);
  }
});

RenderModalComponent.reopenClass({
  positionalParams: ['modal']
});

export default RenderModalComponent;

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('main', { path: 'main' }, function() {
    this.route('messages');
  });
});

export default Router;

services.modal.js

import Ember from 'ember';
 
export default Ember.Service.extend({
});

templates.application.hbs

{{link-to 'Application' 'application'}} |
{{link-to 'Main' 'main'}}

<br><br>

{{outlet}}

{{render-active-modal}}

templates.components.messages-modal.hbs

This is the messages modal

templates.components.render-active-modal.hbs

{{#if modal}}
  {{component modal}}
{{/if}}

templates.main.hbs

Main<br><br>

{{link-to 'Show messages' 'main.messages'}}<br>
{{link-to 'Hide messages' 'main'}}

{{outlet}}

templates.main.messages.hbs

{{render-modal (component "messages-modal")}}

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": "2.8.2",
    "ember-template-compiler": "2.8.2",
    "ember-testing": "2.8.2"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}