search.php

<?php
    include_once("includes/header.php");
?>

<div class="textboxContainer">
    <input type="text" class="searchInput" placeholder="Search for something">
</div>

<div class="results">

</div>

<script>
    $(function () {
        var username = '<?php echo $userLoggedIn; ?>';
        var timer;

        $(".searchInput").keyup(function() {
            clearTimeout(timer);

            timer = setTimeout(function() {
                var val = $(".searchInput").val();

                if(val != "") {
                    $.post("ajax/getSearchResults.php", { term: val, username: username }, function(data) {
                        $(".results").html(data);
                    })
                } else {
                    $(".results").html("");
                }

            }, 500);
        })
    })
</script>