javascript - Function to update total cost not working -

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i building simple shopping cart using simplecart.js.

i have been able display items, add them basket , checkout. however, trying add dropdown allow users select country determine shipping cost.

plunker: http://plnkr.co/edit/ab6jlxmycppwr4isuqez?p=preview

i have added following select, how can connect simplecart.js? believe update() needs called:

js:

<select class="item_shipping" id="addshipping">   <option value="4.99">england £4.99</option>   <option value="5.99">ireland £5.99</option>   <option value="7.99">europe £7.99</option> </select>

see http://plnkr.co/edit/cizshalarqmbrqnb6hgf?p=preview

first need way shipping cost:

simplecart({     shippingcustom: function(){         var ddl = document.getelementbyid("addshipping");         return ddl.options[ddl.selectedindex].value;     } });

and when drop down changes, update values:

document.getelementbyid("addshipping").addeventlistener("change", function(){     simplecart.update(); });

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