$('#send').click(function(e){
            e.preventDefault();
            var reply = $('#reply').val();

            var project_id = 44; // just for reference
            $.ajax({
                type: "post",
                url: "<?php echo base_url(); ?>messages/send",
                data:{ msg:reply, project_id:project_id },
                success: function (response) {


                    if(response=="success"){

                        $(".messages").append('<li class="message" id="message">'+reply+'<a id="delete">delete</a></li>');
                        var clearText = "ture";

                    }else{

                    }

                }


            });

$("#messages").on('click', '#delete', function(event) {
                event.preventDefault();
                var id = 22 ; // just for reference
                $.post( "<?php echo base_url(); ?>messages/delete", { type:'single', id:id } )
                  .done(function( data ) {


                });
                $(this).closest('li').remove();
            });

<ul class="messages" id="messages">
        <li class="message" id="message">sdaghds<a id="delete">delete</a></li>
    </ul>