php - validation on dropdown in javascript -

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i have dropdown named po_no same id coming ajax file

in po_no getting 2 values in format of 1025*3

when put validation on dropdown in javascript write code

if(document.getelementbyid('po_no').value=="")   {  alert("choose purchase order number");  return false;   }

but code not work plz give me ideas

does javascript run after "po_no" added dom? if runs before, "document.getelementbyid('po_no')" return null.


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