Why is my autocomplete not populating the box I want?

gistfile1.js

<div class="dropdown-container right" id="ccsstag_search_div">
    <span class="quiet strong">Find Tags by keyword: </span>
    <input class="input-medium round" id="ccsstag_search" name="search-within" type="text"
        style="background: url(/graphics/css/icon-lg-search.png) 6px 50% no-repeat; padding-left: 30px; margin-top: -9px;">
    <div class="dropdown-menu right inverse" style="margin-top: 2px; padding-top: 9px; padding-bottom: 6px;" />
        <div class="caret"><!-- --></div>
        <div class="dropdown-content" style="width: 268px;" id="ccsstag_search_content"><!-- --></div>
    </div>                          
</div>
                                
<script>                            
require(['jquery-ui-1.8.21.custom/js/jquery-ui-1.8.21.custom.min-release-number'], function () {
    var availableTags = [           
        // list of tags eliminated             
    ];                      
    var rlistid_lookup = {  
        // list of IDs eliminated
    };                          
    var droppy = $( "#ccsstag_search" ).autocomplete({
        appendto: 'div.ccsstag_search_content',
        source: availableTags,  
        delay: 0,           
        close: function() { 
            $('#ccsstag_search_div').removeClass('active');
            strval = $("#ccsstag_search").val();
            rlistid = rlistid_lookup[strval];
            if ( rlistid ) {
                document.location = '/search?ccsstag_search=' + rlistid + '&SID=[% SID %]';
            }
            return false;   
        },                  
    });                     
    droppy.data("autocomplete")._renderItem = function( ul, item ) {
        return $( "<li>" )  
            .append( "<a>" + item.label + "</a>" )
            .appendTo( ul );
    };              
    droppy.data("autocomplete")._renderMenu = function( ul, items ) {
        $('#ccsstag_search_div').addClass('active'); // Not sure this is the right place for this
        var that = this;
        $( ul ).addClass( 'nav-select' );
        $.each( items, function( index, item ) {
            that._renderItem( ul, item );
        });
        //$( ul ).find( "li:odd" ).addClass( "strong" );
    };
    console.log("here's droppy");
    console.log(droppy);
});
</script>