How do I format a number to 2 decimal places, but only if there are already decimals?
This should do the job:
var formattedNumber = (x * 1.5).toFixed(2).replace(/[.,]00$/, "");
I suggest:
Math.round(floatNumber*100)/100;
It automatically adds 0, 1 or 2 decimal places.
Working example: http://jsfiddle.net/peeter/JxPZH/
$(document).ready(function() {
$('#itemQuantitySelect_3').change(function() {
var itemPrice = 1.50;
var itemQuantity = $(this).val();
var quantityPrice = (itemPrice * itemQuantity);
if(Math.round(quantityPrice) !== quantityPrice) {
quantityPrice = quantityPrice.toFixed(2);
}
$(this).next("span").html("$" + quantityPrice);
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form action="/" method="post">
<select id='itemQuantitySelect_3' name="itemQuantity_3">
<option value='1'>1 Item</option>
<option value='2'>2 Items</option>
<option value='3'>3 Items</option>
</select>
<span>$1.50</span>
</form>