Question

Why does this simple thing not work in Internet Explorer 9? (works in FireFox)

var total = 0;
$("input[id=anzahl_feld]").each(function() {
    var anzahl = parseInt($(this).val());
    if(!isNaN(anzahl))
    {
        total += Anzahl;
    }
});
alert(total);

Thanks!

Answer 1

You want quotes around the id field

$("input[id='anzahl_feld']")

But since ids are unique (or at least they should be), why not simply do

var $input = $("#anzahl_feld")
var anzahl = parseInt($input.val());
if(!isNaN(anzahl)) { 
     total += anzahl; 
}

If you actually do have multiple inputs with the id of anzahl_feld then that’s probably why IE is choking. You cannot have multiple elements with the same id