Auto Populate Current User Login Name in SharePoint

  1. <script src="https://code.jquery.com/jquery-1.10.2.min.js" type="text/javascript"></script>  
  2. <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.SPServices/2014.02/jquery.SPServices-2014.02.min.js" type="text/javascript"></script>  
  3. <script type="text/javascript">  
  4. $(document).ready(function() {  
  5.     // get the title of current user  
  6.     var UserName= $().SPServices.SPGetCurrentUser({  
  7.     fieldName: "Title",  
  8.     debug: false  
  9. });  
  10. //populate the field ‘Requestor’ with the current account  
  11. $('textarea[title="Requestor"]').val(UserName);  
  12. $('input[title="Requestor"]').val(UserName);  
  13. });  
  14. </script>  
In following Image you can see current user name will be auto populated on page load.