How to increase the value of a quantity field with jQuery?

Question

I have a form with some quantity field and a plus and minus sign on each side,

    

        product1
        

        

Answer 1

I think this should do it:

$('#add').click(function (e) {
    var quant = $(this).next('input');
    quant.val(parseInt(quant.val(), 10) + 1);
};
$('#minus').click(function (e) {
    var quant = $(this).prev('input');
    quant.val(parseInt(quant.val(), 10) - 1);
    if (parseInt(quant.val(), 10) < 0)
    { quant.val(0); }
};

This does however depend on the relative positioning of the controls not changing.