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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<select size="4">
 <option id="1">Please wait ...</option>
 <option id="2">Please wait ...</option>
 <option id="3">Please wait ...</option>
 <option id="4">Please wait ...</option>
 <option id="5">Please wait ...</option>
 <option id="6">Please wait ...</option>
 <option id="7">Please wait ...</option>
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
</select>
</body>
</html>
 
$(document).ready(function(){
  $('select').on('scroll', function(){
    var sel = $(this);
    var lasto = sel.find('option:last');
    var s = sel.position().top + sel.height();
    var o = lasto.height() + lasto.position().top - 4;
    setTimeout(function(){
      if(o < s){console.log('We need AJAX!');}
    }, 2200);
  });
});
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anonymouspro
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