How to compare the value of a dynamically generated textboxes

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Javascript

HTML

i have a text boxes that is dynamically created i want to compare the value of the textboxes to a textbox that sums the values in the dynamically generated textbexes

What I have tried:

function compareVals() {
var subtotal = 0;
var sum = 0;
$("input[name='subtotal[]']").each(function (index) {


var subtotal = $("input[name='subtotal[]']").eq(index).val();
var totalAmount = $("#sum").val();

if(!isNaN(subtotal && (subtotal)))
{
if(totalAmount > subtotal) {
$("input[name='subtotal[]']").eq(index).addClass('changeShape');
}else {
$("input[name='subtotal[]']").eq(index).removeClass('changeShape');
}
}
});
}