drop down menu - How to select a value from the dropdown list using javascript -


i trying select value dropdown list site http://www.snapdeal.com/product/samsung-galaxy-grand-duos-i9082/638689?hid=productgrid_mobiles_1

code used : 

var obj = document.getelementbyid('attribute-select-0');      obj.options[1].selected = true;

if manually select dropdown see href , other attributes of below div changes change dropdown value

console.log(document.getelementbyid('buybutton-1').href);

issue yhe issue facing selecting dropdown value using code have mentioned above still not getting change expected value in console.log(document.getelementbyid('buybutton-1').href);

edit have tried :

obj.selectedindex = 'white';

but same result.

dont know doing wrong

$("#attribute-select-0").val("white");

or plain javascript: 

document.getelementbyid("attribute-select-0").value="white";

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