The source code

    /**
     * @ignore
     *  Local dataSource for ComboBox
     * @author yiminghe@gmail.com
     */
    KISSY.add("combobox/LocalDataSource", function (S) {

        /**
         * Local dataSource for comboBox.
         * xclass: 'combobox-LocalDataSource'.
         * @extends KISSY.Base
         * @class KISSY.ComboBox.LocalDataSource
         */
        function LocalDataSource() {
            LocalDataSource.superclass.constructor.apply(this, arguments);
        }

        function parser(inputVal, data) {
            var ret = [],
                count = 0;
            if (!inputVal) {
                return data;
            }
            S.each(data, function (d) {
                if (d.indexOf(inputVal) != -1) {
                    ret.push(d);
                }
                count++;
            });

            return ret;
        }

        LocalDataSource.ATTRS = {
            /**
             * array of static data for comboBox
             * @cfg {Object[]} data
             */
            /**
             * @ignore
             */
            data:{
                value:[]
            },
            /**
             * parse data function.
             * Defaults to: index of match.
             * @cfg {Function} parse
             */
            parse:{
                value:parser
            }
        };

        S.extend(LocalDataSource, S.Base,{
            /**
             * Data source interface. How to get data for comboBox.
             * @param {String} inputVal current active input's value
             * @param {Function} callback callback to notify comboBox when data is ready
             * @param {Object} context callback 's execution context
             */
            fetchData:function (inputVal, callback, context) {
                var parse = this.get("parse"),
                    data = this.get("data");
                data = parse(inputVal, data);
                callback.call(context, data);
            }
        });

        return LocalDataSource;
    }, {
        requires:['component/base']
    });