Jquery:
        $("#venuecity_country").autocomplete("<?php echo base_url(); ?>venue/get_city_country/",{
            //width: 480,
            matchContains: true,
            minChars: 1,
            onItemSelect:selectItem
        });

        function findValue(li) {
            console.log(li);
            var sValue = li.value;

            $('#event-search-results-content').ngsearch({location:true,locationValue:sValue});
        }

        function selectItem(li) {
            findValue(li);
            $("#city_country").val('');
        }

Controller:
        function get_city_country()
            {
                $query = $this->Venue_Model->get_city_county($this->session->userdata('venue_cntry'));
                if(!empty($query))
                {
                    foreach ($query as $row) {
                        echo $row['city'].','.$row['country_name']. "n";
                    }
                }
                else
                {
                    $get_country = $this->Venue_Model->getLocationInfoByIp($_SERVER['REMOTE_ADDR']);
                    $query = $this->Venue_Model->get_city_county($get_country);
                    if(!empty($query)) {
                        foreach ($query as $row) {
                            echo $row['city'].','.$row['country_name']. "n";
                        }
                    }
                }
            }

Model:
         function get_city_county($session_country)
            {
                $this->db->select('world_cities.country,world_cities.city,world_countries.country_name,world_countries.country_code');
                $this->db->join('world_countries','world_countries.country_code = world_cities.country');
                $this->db->where('world_countries.country_name',$session_country);
                $this->db->or_where('world_countries.country_id',$session_country);
                $this->db->or_where('world_countries.country_code',$session_country);
                $query = $this->db->get('world_cities');
                if(!empty($query))
                {
                        return $query->result_array();
                }
            }

function get_city_county($session_country)
        {
            $this->db->select('world_cities.country,world_cities.city,world_countries.country_name,world_countries.country_code');
            $this->db->join('world_countries','world_countries.country_code = world_cities.country');
            $this->db->where('world_countries.country_name',$session_country);
            $this->db->or_where('world_countries.country_id',$session_country);
            $this->db->or_where('world_countries.country_code',$session_country);
            $this->db->limit(10);
            $query = $this->db->get('world_cities');
            if(!empty($query))
            {
                    return $query->result_array();
            }
        }

$("#venuecity_country").autocomplete("<?php echo base_url(); ?>venue/get_city_country/",{
        //width: 480,
        matchContains: true,
        minChars: 1,
        onItemSelect:selectItem,
        open: function (event, ui) {
             $('<li class=""><a href="#" id="see_more" class="ui-corner-all" tabindex="-1"><span class="label">See More Result</span></a></li>').appendTo('ul.ui-autocomplete');
        }
    });

    function findValue(li) {
        console.log(li);
        var sValue = li.value;

        $('#event-search-results-content').ngsearch({location:true,locationValue:sValue});
    }

    function selectItem(li) {
        findValue(li);
        $("#city_country").val('');
    }