jQuery checkbox and select - sum the values and add in var

Question

The explanation is below the code:

The code for HTML is :

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Answer 1

Try this

$("select").change(function() {
    $('input[name="ch1"]').change(); // trigger change to recalculate
});
$('input[name="ch1"]').change(function() {
    var singleValues = 0;
    $('input[name="ch1"]:checked').each(function() { // loop through checked inputs
        singleValues = +this.value + singleValues;
    });
    singleValues += (+$('#more').val().replace('QR', '').trim());  // add drop down to checked inputs
    $("#usertotal").text(singleValues);
});​

http://jsfiddle.net/wirey00/5s8qr/