$(function() {
    $( "#supcode" ).autocomplete({
        source:"index.php/inventory/supcode",
        minLength: 1
    });
});

function supcode()
{
    $dataarray="";
    $data=$this->Inventorymodel->supcode();
    echo json_encode($data);
}

function supcode(){
$finresult="";
$this->db->select('name');
$query = $this->db->get('supplier');
$result=$query->result_array();

foreach($result as $row){
    $finresult[]=array(
        'name' => $row['name']
    );
}
return $finresult;
}

[ { label: "Choice1", value: "value1" }, ... ]