test empty

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<!DOCTYPE html>
<html>
<head>
<title>Try jQuery Online</title>
<style>
a { cursor: pointer; }
</style>

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script>
function empty(v) { 
  switch (v) {
    case '':
    case 0:
    case '0':
    case null:
    case false:
    case 'undefined':
      return true;
      
    default:
      return false;
  }
}

function copy_vals() {
    if( empty($('#a_start').html()) || empty($('#a_end').html()) ) {
        alert('Empty!');
        return;
    }
    alert($('#a_start').html() + " - " + $('#a_end').html());
    $('#ip_start').val($('#a_start').html());
    $('#ip_end').val($('#a_end').html());
}
</script>
</head>
<body>
<input type="text" value="1.1.1.1" id="ip_start" /><br />
<input type="text" value="1.1.1.1" id="ip_end"  />
<br /><br />
<span type="text" id="a_stat">1.1.1.0</span><br />
<span type="text" id="a_end">1.1.1.255</span>
<br /><br />
<a onclick="javascript: copy_vals();">Copy</a>

</body>
</html>
test empty

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