New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  str: '',
  filterString: Ember.computed('str',{
  get(){return 'str'},
  set(key, value) {return this.set('str',value.replace(' ')) value}
	}),
  actions: {
    
    print(){
      	console.log("filterString=", this.get('filterString'));
    },
  	handleKbd(evt){
      	console.log("handle1", arguments);
      
      if (evt.originalEvent.data === " "){
        console.log("trying to stop")
        evt.stopPropagation();
        return false
      }
		}
	}
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
      {{input
        autocomplete="off"
        value=filterString
        }}
        
        {{filterString}}
<br>
<button {{action "print"}}>print to console</button>
<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"
  }
}