pmacaluso3/application.js

## application.js
window.MarkdownWidget = {}

$(document).ready(function() {
  $('#user_input').on('keyup', function() {
    var inputText = window.MarkdownWidget.viewObject.grabUserInput('#user_input')
    var transformedText = window.MarkdownWidget.transform(inputText)
    window.MarkdownWidget.viewObject.render(transformedText, '#output')
  })
})

## demo.css
.bold {
  font-weight: bold;
}

.italic {
  font-style: italic;
}

## demo.html
<html>
<head>
  <title>Markdown Demo</title>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
  <script type="text/javascript" src="application.js"></script>
  <script type="text/javascript" src="model.js"></script>
  <script type="text/javascript" src="view.js"></script>
  <link rel="stylesheet" type="text/css" href="demo.css">
</head>
<body>
  <h1>Markdown Demo</h1>
  <textarea id="user_input"></textarea>
  <div id="output"></div>
</body>
</html>

## model.js
window.MarkdownWidget.transform = function(inputText) {
  return inputText
    .replace(/\*(.*)\*/, "<span class='bold'>$1</span>")
    .replace(/_(.*)_/, "<span class='italic'>$1</span>")
}

## view.js
window.MarkdownWidget.viewObject = {
  render: function(text, selector) {
    $(selector).html(text)
  },
  grabUserInput: function(selector) {
    var $inputField = $(selector)
    return $inputField.val()
  }
}
	window.MarkdownWidget = {}

	$(document).ready(function() {
	$('#user_input').on('keyup', function() {
	var inputText = window.MarkdownWidget.viewObject.grabUserInput('#user_input')
	var transformedText = window.MarkdownWidget.transform(inputText)
	window.MarkdownWidget.viewObject.render(transformedText, '#output')
	})
	})
	<html>
	<head>
	<title>Markdown Demo</title>
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
	<script type="text/javascript" src="application.js"></script>
	<script type="text/javascript" src="model.js"></script>
	<script type="text/javascript" src="view.js"></script>
	<link rel="stylesheet" type="text/css" href="demo.css">
	</head>
	<body>
	<h1>Markdown Demo</h1>
	<textarea id="user_input"></textarea>
	<div id="output"></div>
	</body>
	</html>
	window.MarkdownWidget.transform = function(inputText) {
	return inputText
	.replace(/\(.)\*/, "<span class='bold'>$1</span>")
	.replace(/_(.*)_/, "<span class='italic'>$1</span>")
	}
	window.MarkdownWidget.viewObject = {
	render: function(text, selector) {
	$(selector).html(text)
	},
	grabUserInput: function(selector) {
	var $inputField = $(selector)
	return $inputField.val()
	}
	}