xml - Select a node that has a specific attribute value in javascript -

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in xml : 

<elements>         <product id="1">                 <brand>xxxxxxx</brand>                 <dci>xxxxx</dci>                 <therapeutic_area>xxxxxx</therapeutic_area>         </product>         <product id="2">                 <brand>xxxxxx</brand>                 <dci>xxxx</dci>                 <therapeutic_area>xxxx</therapeutic_area>         </product>         <product id="3">                 <brand>xxx</brand>                 <dci>xxxx</dci>                 <therapeutic_area>xxxxx</therapeutic_area>         </product>

i need select node has specific attribute value. instance 2

i tried not work:

alert(xmldoc.getelementsbytagname("product")[0].getattributenode("2"));

thanks in advance help

try 

var list=xmldoc.getelementsbytagname("product"); (i=0;i<list.length;i++) {      if(list[i].getattribute("id")==2){         // found node      } }

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