Autocomplete JS

JQueryAutocomplete.js

$(document).ready(function() {
    $('#LetterStaffer').autocomplete({
        delay: 0,
        minLength : 1,
        source : function(request, response) {
            var matcher = new RegExp('^' + $.ui.autocomplete.escapeRegex(request.term), 'i');
            response(grep($('#LetterStaffList option'), function(value) {
                return matcher.test(value);
            }));
        },
        selectFirst: true,
        focus: function (event, ui) {
            return false;
        },
        select: function (event, ui) {
            $('#LetterStaffer').val(ui.item.value);
            return false;
        }
    });
    
    $('.ui-autocomplete-input').live('autocompleteopen', function() {
        var autocomplete = $(this).data('autocomplete'),
        menu = autocomplete.menu;

        if (!autocomplete.options.selectFirst) {
            return;
        }
        menu.activate($.Event({ type: 'mouseenter' }), menu.element.children().first());
    });
});

function grep(elems, callback) {
    var ret = [], retVal;

    for (var i = 0, length = elems.length; i < length; i++) {
        retVal = !!callback($(elems[i]).text());
        if (retVal) { ret.push($(elems[i]).text()); }
    } return ret;
}