Display results to 2 decimal places

I've tried searching Google but I can't get any of the suggestions I find to fit into my code:

<SCRIPT>

window.onload = function() {
	var myForm = document.getElementById("theForm");
	myForm.onsubmit = function() {
		var n1 = document.getElementById("num1").value;
		var n2 = document.getElementById("num2").value;
		var n3 = document.getElementById("num3").value;
		document.getElementById("result").innerHTML = n1 / n3 * n2 * 4.6 / 10;		
		return false;
	}
}
</SCRIPT>

Code (markup):

How do I get the result of document.getElementById("result").innerHTML = n1 / n3 * n2 * 4.6 / 10; to only display to 2 decimal places?

 

first of all, you need to typecast the data to a numeric / interger or you will get errors. use parseInt(value, 10); // radix 10.

second, Math.round(value, decimals);

    myForm.onsubmit = function() {
		var n1 = parseInt(document.getElementById("num1").value, 10); // 10 base radix to avoid errors when entry like 08 in field.
		var n2 = parseInt(document.getElementById("num2").value, 10);
		var n3 = parseInt(document.getElementById("num3").value, 10);
		document.getElementById("result").innerHTML = Math.round(n1 / n3 * n2 * 4.6 / 10 * 100) / 100;		
		return false;
	}

Code (javascript):

 

Thanks, I tried this but it doesn't show any decimal places at all.

 

Okay, after being inspired by what you posted I looked around and altered my code a little to make this which works:

<SCRIPT>

window.onload = function() {
	var myForm = document.getElementById("FuelSave");
	myForm.onsubmit = function() {
		var n1 = parseInt(document.getElementById("num1").value, 10); // 10 base radix to avoid errors when entry like 08 in field.
        var n2 = parseInt(document.getElementById("num2").value, 10);
		
        var n3 = parseInt(document.getElementById("num3").value, 10);
		var n4 = n1 / n3 * n2 * 4.6 / 10;
		document.getElementById("result").innerHTML = n4.toFixed(2);
		
		return false;
	}
}
</SCRIPT>

Code (markup):

 

Math.round(n1 / n3 * n2 * 4.6 / 10 * 100) / 100; - sorry, been coding php all day

 

That's cool. I know virtually nothing about javascript so you showed me a new idea anyway.

 

its pretty lame in that regard - just see here http://www.javascriptkit.com/javatutors/round.shtml

 

multiply the number by 100, take the parseInt of it and then divide the number 100 after taking parse float of it