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<!DOCTYPE html>
<html>
<head>
<link class="jsbin" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1/themes/base/jquery-ui.css" rel="stylesheet" type="text/css" />
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.13/jquery-ui.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  <div>
        <input type="text"   id="tags" class="typeahead tt-query" autocomplete="off" spellcheck="false">
    </div>
</body>
</html>
 
$(function() {
    var availableTags = [
      "Action Script",
      "Apple Script",
      "Asp",
      "BASIC",
      "C",
      "C++",
      "Clojure",
      "COBOL",
      "Cold Fusion",
      "Erlang",
      "Fortran",
      "Groovy",
      "Haskell",
      "Java",
      "Java Script",
      "Lisp",
      "Perl",
      "PHP",
      "Python",
      "Ruby",
      "Scala",
      "Scheme"
    ];
    function split( val ) {
      return val.split( / \s*/ );
    }
    function extractLast( term ) {
      return split( term ).pop();
    }
 $.ui.autocomplete.filter = function (array, term) {
        var matcher = new RegExp("^" + $.ui.autocomplete.escapeRegex(term), "i");
        return $.grep(array, function (value) {
            return matcher.test(value.label || value.value || value);
        });
    };
    $( "#tags" )
      // don't navigate away from the field on tab when selecting an item
      .bind( "keydown", function( event ,ui) {
        
        if ( event.keyCode === $.ui.keyCode.TAB &&
            $( this ).autocomplete( "instance" ).menu.active ) {
          event.preventDefault();
        }
      })
      .autocomplete({
        minLength: 0,
        source: function( request, response ) {        
            var ex=extractLast( request.term);
            var filteredArray = $.ui.autocomplete.filter(availableTags,ex);
            if(ex!=request.term)
            {       
                for(var i=0;i<filteredArray.length;i++)
                    filteredArray[i]= request.term.substr(0,request.term.lastIndexOf(" "))+" " + filteredArray[i];
            }
            response(filteredArray);
        },
        focus: function() {
          // prevent value inserted on focus
          return false;
        },
        select: function( event, ui ) {
          var terms = this.value.split(' ');
          // remove the current input
          terms.pop();
          // add the selected item
          terms.push( ui.item.value );
          // add placeholder to get the comma-and-space at the end
          terms.push( "" );
          this.value = ui.item.value + " ";//terms.join( " " );
          return false;
        }       
      });
  });
Output

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