ajax load into ajax loaded page

ajax load into ajax loaded page

we have a page with radio button and div with id=vijegiload   (1.php) 
if click on radio we have ajax load a dropdown list and   div with id=vijegiload2  from (2.php) with echo code that load in id=vijegiload in 1.php 
now we have a dropdownlist and id=vijegiload2 that added in 1.php now how we can load another thing in id=vijegiload2 with ajax post

  3. $(document).on('change','[id^=vijegi]',function(){
  4. //radio button id=vijegi
  5. if(usr.length >= 1)
  6. {
  7. $("#vijegiload").html('<img src="loader.gif" align="absmiddle">loading');

  9.     var xhr =$.ajax({  
  10.     type: "POST",  
  11.     url: "2.php", 
  12. cache: false, 
  14.     data: "postvijegi="+ usr,  
  15.     success: function(msg){  
  16.    
  17.    $("#vijegiload").ajaxComplete(function(event, request, settings){ 
  18.    
  19.    
  20.     
  21. })
now i dont know why we can not use above code for 3.php to load data in  id=vijegiload2