jQuery addition error -


i have strange error going on. jquery function 

jquery(document).ready(function(){   jquery("#new_customer").delegate(".kool", "keyup", function(event) {       var selectprod = jquery('.price, .qty',this);     var price = jquery('.price', this).val();     var qty =   jquery ('.qty', this).val();     var amount = price + qty;     var lineitemwrapperelement = selectprod.parent().parent();     jquery("input.amount", lineitemwrapperelement).val(amount);   });  });

instead of doing addtion "+" concatinating. i.e 12+1 coming 121 seems problem?? guidance do.

this happens because concatenate strings. have convert variables numeric type. assume price can float, can use parsefloat() function:

var amount = parsefloat(price) + parsefloat(qty);

in order fix precision can use tofixed() after:

amount = amount.tofixed(2);

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