javascript - Calculating Values loaded in via jquery -

a continuation solved case new problem. following code calculates values loaded in via ajax script. series of options in form determine information loaded in , therefore final calculations are.

the problem once have loaded in available options cannot load them out , script adds field totals in fact fail @ point. example if load in 2 options had totals. load in third , add total of 3. take 1 option out , script fails. believe way script fetches product ids — var productids = {};

any appreciated

here code

var productids = {};  function product_totals(id) {     productids[id] = true; // store id's totals calculated     var quantity = $c('product_quantity_' + id).value;     var price = $c('product_price_' + id).value;     var duration = $c('product_duration_' + id).value;     var dives = $c('product_dives_' + id).value;     var hire = $c('product_hire_' + id).value;     number($c('product_price_total_' + id).value = price * quantity);     number($c('product_duration_total_' + id).value = duration * quantity);     number($c('product_dives_total_' + id).value = dives * quantity);     number($c('product_hire_total_' + id).value = hire * quantity);      function $c(id) {         return document.getelementbyid(id);     }      var totalpricetotal = 0;     var totaldurationtotal = 0;     var totaldivestotal = 0;     var totalhiretotal = 0;     (var id in productids) {         // multiply 1 make sure it's number         totalpricetotal += $c('product_price_total_' + id).value * 1;         totaldurationtotal += $c('product_duration_total_' + id).value * 1;         totaldivestotal += $c('product_dives_total_' + id).value * 1;         totalhiretotal += $c('product_hire_total_' + id).value * 1;     }     $c('gt_total_price').value = totalpricetotal;     $c('gt_total_duration').value = totaldurationtotal;     $c('gt_total_dives').value = totaldivestotal;     $c('gt_total_hire').value = totalhiretotal;      function $c(id) {         return document.getelementbyid(id);     } } 

working sample @ http://www.divethegap.com/update/diving-trips/adventure-training/#level_01 (click on beginners) many thanks

if understand, trying achieve stack collection of ids in array can remove items can calculate selected options. declare var productids = []; , add ids in using productids.push(id). when remove option use productids.splice(indexofid, 1);. when recalcultate have ids want.