Dropdown combo box switch

<html>

<head>

<meta content="text/html; charset=utf-8" http-equiv="Content-Type">



<title>Multiply</title>

<style>

* 		{ text-align:center; }

input 	{ width:40px; }

</style>



<script>

function getOp()

{

	var e = document.getElementById("Select1");

	return e.options[e.selectedIndex].value;

}



function getresult()

{

	n1 = document.getElementById('num1').value;

	n2 = document.getElementById('num2').value;

	n0 = 0;

	

	switch(getOp()) {

    case "+":

        n0 = parseInt(n1) + parseInt(n2);

        break;

    case "-":

        n0 = n1 - n2;

        break;

    case ":":

        n0 = n1 / n2;

        break;

    case "x":

        n0 = n1 * n2;

        break;

	}

	document.getElementById('result').innerHTML = n0;

}

</script>



</head>



<body>

<p>Multiply Page</p>

	<input id="num1" type="number">



	<select id="Select1">

		<option selected="" value="+">+</option>

		<option value="-">-</option>

		<option value=":">:</option>

		<option value="x">x</option>

	</select>

	

	<input id="num2" type="number">

	<input name="bt1" type="button" value="=" onclick="getresult()">

	<span id="result"></span>

</body>



</html>

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Dropdown combo box switch