https://stackoverflow.com/questions/45793262/keyup-not-working-what-is-the-correct-way-to-trigger-a-keyup-on-input-field/45793350

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actions:{
 numberValidate(value){ 
   this.send('numberValidateInRoute',value); 
   //check for condition before focussing.
   Ember.$('.input1')[0].focus()
 }
}
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  actions:{
 numberValidateInRoute(value){ 
   console.log(" value ",value); 
 }
}
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<span class="opt-num">
            <input type="number" tabindex="1" min="0" max="9" maxlength="1" value="" onKeyUp={{action "numberValidate" value="target.value"}} style="border:1px solid red" >
<input class="input1" type="number"  min="0" max="9" maxlength="1" value="" onKeyUp={{action "numberValidate"}} style="border:1px solid red" >
        </span>
<br>
{{outlet}}
<br>
<br>

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-data": "2.12.1"
  }
}