New Twiddle

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';

console.clear();

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

	@tracked amount;

	@action
	handleAmountChange(event) {
    console.log(event.target.value);
    
    let value = event.target.value;
    let regex = /^[0-9]*\.[0-9]{2}$/;
    let numberType = /[0-9.]/.test(event.key) && !(event.key == '.' && value.includes('.'));
    
    console.log(!(event.key == '.' && value.includes('.')))

    if (!numberType || (regex.test(value) && event.target.selectionStart > value.indexOf('.'))) {
      event.preventDefault();
    }

  	// event.preventDefault()
  }
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<input 
	value={{this.amount}} 
  placeholder="Enter Amount" 
  {{on "keypress" this.handleAmountChange}}
>
<br>
{{outlet}}
<br>
<br>

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"
  }
}