With Below Script you can easily get maximun values from all options values using JavaScript code.
<!DOCTYPE html>
<html>
<head>
<!--#ref:http://stackoverflow.com/questions/21255138/how-does-the-math-max-apply-work-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script language="Javascript">
function myFunction() {
var valuearray = Array();
$('#productlist option').each( function() {
valuearray.push($(this).attr('value'));
}).get();
console.log(valuearray);
var maxValue = Math.max.apply( Math, valuearray );
console.log(Math.max(valuearray));
document.getElementById("demo").innerHTML = maxValue;
}
</script>
</head>
<body>
<div id="layout">
<div id="product-options">
<select id="productlist">
<option value="1">Product A</option>
<option value="10">Product B</option>
<option value="20">Product C</option>
<option value="1000">Product D</option>
<option value="40">Product E</option>
<option value="3">Product F</option>
<option value="5">Product G</option>
</select>
</div>
</div>
<button type="button" onclick="myFunction()">Try it</button>
<p id="demo"></p>
</body>
</html>
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