Hi letstry,
Refer below code.
HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<div id="checkboxes">
<textarea id="txtType" name="type" rows="5" cols="35"></textarea>
<br />
<input type="checkbox" value="Car" /><label>Car</label>
<input type="checkbox" value="Bus" /><label>Bus</label>
<input type="checkbox" value="3" /><label>3</label>
<input type="checkbox" value="4" /><label>4</label>
</div>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
$(function () {
$('#txtType').on('keyup', function () {
$('#checkboxes').find('input[type=checkbox]').each(function () {
$(this).removeAttr('checked');
});
var types = $(this).val().split('\n');
$(types).each(function () {
$('#checkboxes').find('input[value="' + $(this)[0] + '"]').attr('checked', 'checked');
});
});
});
</script>
</body>
</html>
Demo
