ember-header-route-transition

components.my-header.js

import Ember from 'ember';

export default Ember.Component.extend({
  
  actions: {
  	updateQuery(){
    	this.get('updateQuery')();
    }
  }
  
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  actions: {
  	updateQuery(){
      this.set('flag', false);
    	this.transitionToRoute('search-results');
    }
  }
  
});

router.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

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

Router.map(function() {
  this.route('search-results', {path: '/search-results'});
});

export default Router;

routes.search-results.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{my-header updateQuery=(action 'updateQuery') flag=flag }}
<br>
{{outlet}}
<br>
<br>

templates.components.my-header.hbs

Click checkbox for search box
<br>
{{input type='checkbox' checked=flag}}
{{#if flag}}
  {{input insert-newline=(action 'updateQuery') placeholder="Press Enter for search-results" }}
{{/if}}

templates.search-results.hbs

Inside search-results
<br>

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"
  }
}