[Solved] jQuery – update variable when input values changed

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With a few tweaks to the JS and HTML, the following code works…

$('body').on('keyup', '.qty_field', function () {
var sum = 0;
$('.qty_field').each(function() {
    sum += Number($(this).val());
});

    $('.running_total').html(sum);
});

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solved jQuery – update variable when input values changed