将我的组合框的选定值传递给另一个输入值

我希望将组合框的选定值传递给id为"val“的输入值。

我尝试使用jquery传递该值

 $(document).ready(function() {
            $('#btn').click(function(e) {
                $('#combobox').change(function() {
                    var selected = $('option:selected', $(this)).text();
                    alert($('#val').val(selected));
                });

            });
        });

但它不起作用。请帮帮忙。

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet"
	href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script
	src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script
	src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
	<div class="container">
		<h1>Form</h1>
		<form method="post" id="form" name="form">
			<div class="form-group row">
				<label class="col-xs-3 control-label" style="margin-top: 10px;">Choice</label>
				<div class="col-xs-5 selectContainer">
					<select id="combobox" class="form-control">
						<option value="1">1</option>
						<option value="2">2</option>
					</select>
				</div>
				<input id="val" type="hidden" name="val"> 
				<input id="btn" class="btn btn-info" value="Submit">
			</div>
		</form>
	</div>

	<script type=text/javascript>
		$(document).ready(function() {
			$('#btn').click(function(e) {
				$('#combobox').change(function() {
					var selected = $('option:selected', $(this)).text();
					alert($('#val').val(selected));
				});

			});
		});
	</script>
</body>
</html>

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