Question

I have search suggestion autocompletion using jQuery UI autocomplete plugin.
http://jqueryui.com/autocomplete/

But how to add on the bottom of results popup item which behaves like on Quora(see below).

Javascript

$("#question_search").autocomplete({
  source:$('#question_search').data('source'),
  html: true,
  appendTo: "#search_results",
  select: function( event, ui ) {
    window.location=ui.item.value;
    return false;
  },
  focus: function( event, ui ) { },
  open: function( event, ui ) { });

View

<div id="question_search_form">
  <input type="text" id="question_search" data-source="<%= new_search_url %>" />
  <div id="search_results"></div>
</div>

Example

Answer 1

I recommend overriding the _renderMenu then simply appending an anchor within a list-item.

JAVASCRIPT:

$( "#question_search" ).autocomplete({
    source:$('#question_search').data('source'),
    html: true,
    appendTo: "#search_results",
    select: function( event, ui ) {
        window.location=ui.item.value;
        return false;
    },
      focus: function( event, ui ) { },
      open: function( event, ui ) { }
}).data( "autocomplete" )._renderMenu = function( ul, items ) {
  $.ui.autocomplete.prototype._renderMenu.apply( this, [ul, items] );
  ul.append( '<li><a href="/search/'+ this.term + '">Search: '+ this.term + '</a></li>' );  
};

DEMO:
http://jsfiddle.net/4pk3V/42/

Hope this helps! Let me know if you have any questions!