Input Change Test

components.my-component\.js

import Component from '@glimmer/component';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';

export default class extends Component {
  @tracked value = '';
    
  @action
  onKeyUp(e) {
    let keyboardCode;

    if (e.key !== undefined) {
      keyboardCode = e.key;
    } else if (e.keyCode !== undefined) {
      keyboardCode = e.keyCode;
    }

    if (keyboardCode === 'Enter') {
      this.value = e.target.value + '.00';
    }
  }
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

templates.application\.hbs

<MyComponent />

templates.components.my-component\.hbs

value: {{this.value}}<br>
<input value={{readonly this.value}} {{on 'keyup' this.onKeyUp}}>

{{yield}}

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}