jquery - PHP+Ajax Passing input keyword for live search - Stack Overflow

<input id="search">
    <table border="1" BORDERCOLOR=black>
    <thead> 
    <tr>
        <th>Name</th><th>LastName</th><th>E-Mail</th>
    </tr>
    </thead>

    <tbody id="theContent">

    </tbody>

    </table>

    </body>

    <script type="text/javascript">

    function loadUser(){

        $.ajax({
            url: 'users.ajax.php'

        }).done(function(data){
            var HTML = '';
            data = JSON.parse(data);

            $.each(data['usersData'], function(key, val){
                HTML += getSingleUserLine(val);
            });


            $('#theContent').html(HTML);

            $( '#search' ).keyup(function() {   // need it to send the keyword here and refresh the results?
                 alert( "Handler for .keyup() called." );
            });

        });
        }

    function getSingleUserLine(data){
        if(data){
            var string = '';

            string = '<tr><td>'+data.fname+'</td><td>'+data.lname+'</td><td>'+data.email+'</td></tr>';

            return string;

        }else{
            return false;
        }
    }

    $(document).ready(function(){
            loadUser();
    });
    </script>