<script type="text/javascript">
        $(function(){
            $("#get_names_product").autocomplete({
                source: "<?php echo site_url('inventory/get_price'); ?>" // path to the get_product_price method
            });
        });
    </script>

<form name="frmOne" id="newBatch" class="form-horizontal" action="" method="post">

            <div class="form-group">
                <label for="customerName" style="color:#3fa9f5;" class="col-sm-3 control-label">Product Name</label>
                <div class="col-sm-8">
                    <input type="text" value="<?php echo isset($post)?$post->product_name:''; ?>" class="form-control" name="systemProduct[product_name]" id="get_names_product" placeholder="Enter Product Name">
                </div>
            </div>

            <div class="form-group">
                <label for="cost" style="color:#3fa9f5;" class="col-sm-3 control-label">Unit</label>
                <div class="col-sm-8">
                    <input type="text" value="<?php echo isset($post)?$post->unit:''; ?>" class="form-control" name="systemProduct[cost]" placeholder="Enter Product Cost ">
                </div>
            </div>
</form>

function get_product_names()
{
    $this->load->model('productModel', 'product');
    if (isset($_GET['term'])) {
        $q = strtolower($_GET['term']);
        $this->product->get_name_product($q);
    }
}

function get_name_product($q)
{
    $q = $this->db->query("SELECT distinct `product_name` FROM `product` where `deleteProduct` = '0' and product_name LIKE '%$q%'");
    if ($q->num_rows() > 0) {
        foreach ($q->result_array() as $row) {
            $row_set[] = htmlentities(stripslashes($row['product_name'])); //build an array
        }
        echo json_encode($row_set); //format the array into json data
    }
}