required input

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions: {
    save: function() {
      alert('saving ' + this.get('foo'));
    }
  }
});

templates.application.hbs

<form {{action "save" on="submit"}}>
  <input value="" required>
</form>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {}
}