Subversion-Projekte lars-tiefland.webanos.zeldi.de

/* http://keith-wood.name/countdown.html

   Countdown for jQuery v1.5.3.

   Written by Keith Wood (kbwood{at}iinet.com.au) January 2008.

   Dual licensed under the GPL (http://dev.jquery.com/browser/trunk/jquery/GPL-LICENSE.txt) and

   MIT (http://dev.jquery.com/browser/trunk/jquery/MIT-LICENSE.txt) licenses.

   Please attribute the author if you use it. */

/* Display a countdown timer.

   Attach it with options like:

   $('div selector').countdown(

       {until: new Date(2009, 1 - 1, 1, 0, 0, 0), onExpiry: happyNewYear}); */

(function($) { // Hide scope, no $ conflict

/* Countdown manager. */

function Countdown() {

    this.regional = []; // Available regional settings, indexed by language code

    this.regional[''] = { // Default regional settings

        // The display texts for the counters

        labels: ['Years', 'Months', 'Weeks', 'Days', 'Hours', 'Minutes', 'Seconds'],

        // The display texts for the counters if only one

        labels1: ['Year', 'Month', 'Week', 'Day', 'Hour', 'Minute', 'Second'],

        compactLabels: ['y', 'm', 'w', 'd'], // The compact texts for the counters

        timeSeparator: ':', // Separator for time periods

        isRTL: false // True for right-to-left languages, false for left-to-right

    };

    this._defaults = {

        until: null, // new Date(year, mth - 1, day, hr, min, sec) - date/time to count down to

            // or numeric for seconds offset, or string for unit offset(s):

            // 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds

        since: null, // new Date(year, mth - 1, day, hr, min, sec) - date/time to count up from

            // or numeric for seconds offset, or string for unit offset(s):

            // 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds

        timezone: null, // The timezone (hours or minutes from GMT) for the target times,

            // or null for client local

        format: 'dHMS', // Format for display - upper case for always, lower case only if non-zero,

            // 'Y' years, 'O' months, 'W' weeks, 'D' days, 'H' hours, 'M' minutes, 'S' seconds

        layout: '', // Build your own layout for the countdown

        compact: false, // True to display in a compact format, false for an expanded one

        description: '', // The description displayed for the countdown

        expiryUrl: '', // A URL to load upon expiry, replacing the current page

        expiryText: '', // Text to display upon expiry, replacing the countdown

        alwaysExpire: false, // True to trigger onExpiry even if never counted down

        onExpiry: null, // Callback when the countdown expires -

            // receives no parameters and 'this' is the containing division

        onTick: null // Callback when the countdown is updated -

            // receives int[7] being the breakdown by period (based on format)

            // and 'this' is the containing division

    };

    $.extend(this._defaults, this.regional['']);

}

var PROP_NAME = 'countdown';

var Y = 0; // Years

var O = 1; // Months

var W = 2; // Weeks

var D = 3; // Days

var H = 4; // Hours

var M = 5; // Minutes

var S = 6; // Seconds

$.extend(Countdown.prototype, {

    /* Class name added to elements to indicate already configured with countdown. */

    markerClassName: 'hasCountdown',

    /* Shared timer for all countdowns. */

    _timer: setInterval(function() { $.countdown._updateTargets(); }, 980),

    /* List of currently active countdown targets. */

    _timerTargets: [],

    /* Override the default settings for all instances of the countdown widget.

       @param  options  (object) the new settings to use as defaults */

    setDefaults: function(options) {

        this._resetExtraLabels(this._defaults, options);

        extendRemove(this._defaults, options || {});

    },

    /* Convert a date/time to UTC.

       @param  tz     (number) the hour or minute offset from GMT, e.g. +9, -360

       @param  year   (Date) the date/time in that timezone or

                      (number) the year in that timezone

       @param  month  (number, optional) the month (0 - 11) (omit if year is a Date)

       @param  day    (number, optional) the day (omit if year is a Date)

       @param  hours  (number, optional) the hour (omit if year is a Date)

       @param  mins   (number, optional) the minute (omit if year is a Date)

       @param  secs   (number, optional) the second (omit if year is a Date)

       @param  ms     (number, optional) the millisecond (omit if year is a Date)

       @return  (Date) the equivalent UTC date/time */

    UTCDate: function(tz, year, month, day, hours, mins, secs, ms) {

        if (typeof year == 'object' && year.constructor == Date) {

            ms = year.getMilliseconds();

            secs = year.getSeconds();

            mins = year.getMinutes();

            hours = year.getHours();

            day = year.getDate();

            month = year.getMonth();

            year = year.getFullYear();

        }

        var d = new Date();

        d.setUTCFullYear(year);

        d.setUTCDate(1);

        d.setUTCMonth(month || 0);

        d.setUTCDate(day || 1);

        d.setUTCHours(hours || 0);

        d.setUTCMinutes((mins || 0) - (Math.abs(tz) < 30 ? tz * 60 : tz));

        d.setUTCSeconds(secs || 0);

        d.setUTCMilliseconds(ms || 0);

        return d;

    },

    /* Attach the countdown widget to a div.

       @param  target   (element) the containing division

       @param  options  (object) the initial settings for the countdown */

    _attachCountdown: function(target, options) {

        var $target = $(target);

        if ($target.hasClass(this.markerClassName)) {

            return;

        }

        $target.addClass(this.markerClassName);

        var inst = {options: $.extend({}, options),

            _periods: [0, 0, 0, 0, 0, 0, 0]};

        $.data(target, PROP_NAME, inst);

        this._changeCountdown(target);

    },

    /* Add a target to the list of active ones.

       @param  target  (element) the countdown target */

    _addTarget: function(target) {

        if (!this._hasTarget(target)) {

            this._timerTargets.push(target);

        }

    },

    /* See if a target is in the list of active ones.

       @param  target  (element) the countdown target

       @return  (boolean) true if present, false if not */

    _hasTarget: function(target) {

        return ($.inArray(target, this._timerTargets) > -1);

    },

    /* Remove a target from the list of active ones.

       @param  target  (element) the countdown target */

    _removeTarget: function(target) {

        this._timerTargets = $.map(this._timerTargets,

            function(value) { return (value == target ? null : value); }); // delete entry

    },

    /* Update each active timer target. */

    _updateTargets: function() {

        for (var i = 0; i < this._timerTargets.length; i++) {

            this._updateCountdown(this._timerTargets[i]);

        }

    },

    /* Redisplay the countdown with an updated display.

       @param  target  (jQuery) the containing division

       @param  inst    (object) the current settings for this instance */

    _updateCountdown: function(target, inst) {

        var $target = $(target);

        inst = inst || $.data(target, PROP_NAME);

        if (!inst) {

            return;

        }

        $target.html(this._generateHTML(inst));

        $target[(this._get(inst, 'isRTL') ? 'add' : 'remove') + 'Class']('countdown_rtl');

        var onTick = this._get(inst, 'onTick');

        if (onTick) {

            onTick.apply(target, [inst._hold != 'lap' ? inst._periods :

                this._calculatePeriods(inst, inst._show, new Date())]);

        }

        var expired = inst._hold != 'pause' &&

            (inst._since ? inst._now.getTime() <= inst._since.getTime() :

            inst._now.getTime() >= inst._until.getTime());

        if (expired && !inst._expiring) {

            inst._expiring = true;

            if (this._hasTarget(target) || this._get(inst, 'alwaysExpire')) {

                this._removeTarget(target);

                var onExpiry = this._get(inst, 'onExpiry');

                if (onExpiry) {

                    onExpiry.apply(target, []);

                }

                var expiryText = this._get(inst, 'expiryText');

                if (expiryText) {

                    var layout = this._get(inst, 'layout');

                    inst.options.layout = expiryText;

                    this._updateCountdown(target, inst);

                    inst.options.layout = layout;

                }

                var expiryUrl = this._get(inst, 'expiryUrl');

                if (expiryUrl) {

                    window.location = expiryUrl;

                }

            }

            inst._expiring = false;

        }

        else if (inst._hold == 'pause') {

            this._removeTarget(target);

        }

        $.data(target, PROP_NAME, inst);

    },

    /* Reconfigure the settings for a countdown div.

       @param  target   (element) the containing division

       @param  options  (object) the new settings for the countdown or

                        (string) an individual property name

       @param  value    (any) the individual property value

                        (omit if options is an object) */

    _changeCountdown: function(target, options, value) {

        options = options || {};

        if (typeof options == 'string') {

            var name = options;

            options = {};

            options[name] = value;

        }

        var inst = $.data(target, PROP_NAME);

        if (inst) {

            this._resetExtraLabels(inst.options, options);

            extendRemove(inst.options, options);

            this._adjustSettings(inst);

            $.data(target, PROP_NAME, inst);

            var now = new Date();

            if ((inst._since && inst._since < now) ||

                    (inst._until && inst._until > now)) {

                this._addTarget(target);

            }

            this._updateCountdown(target, inst);

        }

    },

    /* Reset any extra labelsn and compactLabelsn entries if changing labels.

       @param  base     (object) the options to be updated

       @param  options  (object) the new option values */

    _resetExtraLabels: function(base, options) {

        var changingLabels = false;

        for (var n in options) {

            if (n.match(/[Ll]abels/)) {

                changingLabels = true;

                break;

            }

        }

        if (changingLabels) {

            for (var n in base) { // Remove custom numbered labels

                if (n.match(/[Ll]abels[0-9]/)) {

                    base[n] = null;

                }

            }

        }

    },

    /* Remove the countdown widget from a div.

       @param  target  (element) the containing division */

    _destroyCountdown: function(target) {

        var $target = $(target);

        if (!$target.hasClass(this.markerClassName)) {

            return;

        }

        this._removeTarget(target);

        $target.removeClass(this.markerClassName).empty();

        $.removeData(target, PROP_NAME);

    },

    /* Pause a countdown widget at the current time.

       Stop it running but remember and display the current time.

       @param  target  (element) the containing division */

    _pauseCountdown: function(target) {

        this._hold(target, 'pause');

    },

    /* Pause a countdown widget at the current time.

       Stop the display but keep the countdown running.

       @param  target  (element) the containing division */

    _lapCountdown: function(target) {

        this._hold(target, 'lap');

    },

    /* Resume a paused countdown widget.

       @param  target  (element) the containing division */

    _resumeCountdown: function(target) {

        this._hold(target, null);

    },

    /* Pause or resume a countdown widget.

       @param  target  (element) the containing division

       @param  hold    (string) the new hold setting */

    _hold: function(target, hold) {

        var inst = $.data(target, PROP_NAME);

        if (inst) {

            if (inst._hold == 'pause' && !hold) {

                inst._periods = inst._savePeriods;

                var sign = (inst._since ? '-' : '+');

                inst[inst._since ? '_since' : '_until'] =

                    this._determineTime(sign + inst._periods[0] + 'y' +

                        sign + inst._periods[1] + 'o' + sign + inst._periods[2] + 'w' +

                        sign + inst._periods[3] + 'd' + sign + inst._periods[4] + 'h' +

                        sign + inst._periods[5] + 'm' + sign + inst._periods[6] + 's');

                this._addTarget(target);

            }

            inst._hold = hold;

            inst._savePeriods = (hold == 'pause' ? inst._periods : null);

            $.data(target, PROP_NAME, inst);

            this._updateCountdown(target, inst);

        }

    },

    /* Return the current time periods.

       @param  target  (element) the containing division

       @return  (number[7]) the current periods for the countdown */

    _getTimesCountdown: function(target) {

        var inst = $.data(target, PROP_NAME);

        return (!inst ? null : (!inst._hold ? inst._periods :

            this._calculatePeriods(inst, inst._show, new Date())));

    },

    /* Get a setting value, defaulting if necessary.

       @param  inst  (object) the current settings for this instance

       @param  name  (string) the name of the required setting

       @return  (any) the setting's value or a default if not overridden */

    _get: function(inst, name) {

        return (inst.options[name] != null ?

            inst.options[name] : $.countdown._defaults[name]);

    },

    /* Calculate interal settings for an instance.

       @param  inst  (object) the current settings for this instance */

    _adjustSettings: function(inst) {

        var now = new Date();

        var timezone = this._get(inst, 'timezone');

        timezone = (timezone == null ? -new Date().getTimezoneOffset() : timezone);

        inst._since = this._get(inst, 'since');

        if (inst._since) {

            inst._since = this.UTCDate(timezone, this._determineTime(inst._since, null));

        }

        inst._until = this.UTCDate(timezone, this._determineTime(this._get(inst, 'until'), now));

        inst._show = this._determineShow(inst);

    },

    /* A time may be specified as an exact value or a relative one.

       @param  setting      (string or number or Date) - the date/time value

                            as a relative or absolute value

       @param  defaultTime  (Date) the date/time to use if no other is supplied

       @return  (Date) the corresponding date/time */

    _determineTime: function(setting, defaultTime) {

        var offsetNumeric = function(offset) { // e.g. +300, -2

            var time = new Date();

            time.setTime(time.getTime() + offset * 1000);

            return time;

        };

        var offsetString = function(offset) { // e.g. '+2d', '-4w', '+3h +30m'

            offset = offset.toLowerCase();

            var time = new Date();

            var year = time.getFullYear();

            var month = time.getMonth();

            var day = time.getDate();

            var hour = time.getHours();

            var minute = time.getMinutes();

            var second = time.getSeconds();

            var pattern = /([+-]?[0-9]+)\s*(s|m|h|d|w|o|y)?/g;

            var matches = pattern.exec(offset);

            while (matches) {

                switch (matches[2] || 's') {

                    case 's': second += parseInt(matches[1], 10); break;

                    case 'm': minute += parseInt(matches[1], 10); break;

                    case 'h': hour += parseInt(matches[1], 10); break;

                    case 'd': day += parseInt(matches[1], 10); break;

                    case 'w': day += parseInt(matches[1], 10) * 7; break;

                    case 'o':

                        month += parseInt(matches[1], 10);

                        day = Math.min(day, $.countdown._getDaysInMonth(year, month));

                        break;

                    case 'y':

                        year += parseInt(matches[1], 10);

                        day = Math.min(day, $.countdown._getDaysInMonth(year, month));

                        break;

                }

                matches = pattern.exec(offset);

            }

            return new Date(year, month, day, hour, minute, second, 0);

        };

        var time = (setting == null ? defaultTime :

            (typeof setting == 'string' ? offsetString(setting) :

            (typeof setting == 'number' ? offsetNumeric(setting) : setting)));

        if (time) time.setMilliseconds(0);

        return time;

    },

    /* Determine the number of days in a month.

       @param  year   (number) the year

       @param  month  (number) the month

       @return  (number) the days in that month */

    _getDaysInMonth: function(year, month) {

        return 32 - new Date(year, month, 32).getDate();

    },

    /* Generate the HTML to display the countdown widget.

       @param  inst  (object) the current settings for this instance

       @return  (string) the new HTML for the countdown display */

    _generateHTML: function(inst) {

        // Determine what to show

        inst._periods = periods = (inst._hold ? inst._periods :

            this._calculatePeriods(inst, inst._show, new Date()));

        // Show all 'asNeeded' after first non-zero value

        var shownNonZero = false;

        var showCount = 0;

        for (var period = 0; period < inst._show.length; period++) {

            shownNonZero |= (inst._show[period] == '?' && periods[period] > 0);

            inst._show[period] = (inst._show[period] == '?' && !shownNonZero ? null : inst._show[period]);

            showCount += (inst._show[period] ? 1 : 0);

        }

        var compact = this._get(inst, 'compact');

        var layout = this._get(inst, 'layout');

        var labels = (compact ? this._get(inst, 'compactLabels') : this._get(inst, 'labels'));

        var timeSeparator = this._get(inst, 'timeSeparator');

        var description = this._get(inst, 'description') || '';

        var showCompact = function(period) {

            var labelsNum = $.countdown._get(inst, 'compactLabels' + periods[period]);

            return (inst._show[period] ? periods[period] +

                (labelsNum ? labelsNum[period] : labels[period]) + ' ' : '');

        };

        var showFull = function(period) {

            var labelsNum = $.countdown._get(inst, 'labels' + periods[period]);

            return (inst._show[period] ?

                '<span class="countdown_section"><span class="countdown_amount">' +

                periods[period] + '</span><br/>' +

                (labelsNum ? labelsNum[period] : labels[period]) + '</span>' : '');

        };

        return (layout ? this._buildLayout(inst, layout, compact) :

            ((compact ? // Compact version

            '<span class="countdown_row countdown_amount' +

            (inst._hold ? ' countdown_holding' : '') + '">' +

            showCompact(Y) + showCompact(O) + showCompact(W) + showCompact(D) +

            (inst._show[H] ? this._minDigits(periods[H], 2) : '') +

            (inst._show[M] ? (inst._show[H] ? timeSeparator : '') +

            this._minDigits(periods[M], 2) : '') +

            (inst._show[S] ? (inst._show[H] || inst._show[M] ? timeSeparator : '') +

            this._minDigits(periods[S], 2) : '') :

            // Full version

            '<span class="countdown_row countdown_show' + showCount +

            (inst._hold ? ' countdown_holding' : '') + '">' +

            showFull(Y) + showFull(O) + showFull(W) + showFull(D) +

            showFull(H) + showFull(M) + showFull(S)) + '</span>' +

            (description ? '<span class="countdown_row countdown_descr">' + description + '</span>' : '')));

    },

    /* Construct a custom layout.

       @param  inst     (object) the current settings for this instance

       @param  layout   (string) the customised layout

       @param  compact  (boolean) true if using compact labels

       @return  (string) the custom HTML */

    _buildLayout: function(inst, layout, compact) {

        var labels = this._get(inst, (compact ? 'compactLabels' : 'labels'));

        var labelFor = function(index) {

            return ($.countdown._get(inst,

                (compact ? 'compactLabels' : 'labels') + inst._periods[index]) ||

                labels)[index];

        };

        var digit = function(value, position) {

            return Math.floor(value / position) % 10;

        };

        var subs = {desc: this._get(inst, 'description'), sep: this._get(inst, 'timeSeparator'),

            yl: labelFor(Y), yn: inst._periods[Y], ynn: this._minDigits(inst._periods[Y], 2),

            ynnn: this._minDigits(inst._periods[Y], 3), y1: digit(inst._periods[Y], 1),

            y10: digit(inst._periods[Y], 10), y100: digit(inst._periods[Y], 100),

            ol: labelFor(O), on: inst._periods[O], onn: this._minDigits(inst._periods[O], 2),

            onnn: this._minDigits(inst._periods[O], 3), o1: digit(inst._periods[O], 1),

            o10: digit(inst._periods[O], 10), o100: digit(inst._periods[O], 100),

            wl: labelFor(W), wn: inst._periods[W], wnn: this._minDigits(inst._periods[W], 2),

            wnnn: this._minDigits(inst._periods[W], 3), w1: digit(inst._periods[W], 1),

            w10: digit(inst._periods[W], 10), w100: digit(inst._periods[W], 100),

            dl: labelFor(D), dn: inst._periods[D], dnn: this._minDigits(inst._periods[D], 2),

            dnnn: this._minDigits(inst._periods[D], 3), d1: digit(inst._periods[D], 1),

            d10: digit(inst._periods[D], 10), d100: digit(inst._periods[D], 100),

            hl: labelFor(H), hn: inst._periods[H], hnn: this._minDigits(inst._periods[H], 2),

            hnnn: this._minDigits(inst._periods[H], 3), h1: digit(inst._periods[H], 1),

            h10: digit(inst._periods[H], 10), h100: digit(inst._periods[H], 100),

            ml: labelFor(M), mn: inst._periods[M], mnn: this._minDigits(inst._periods[M], 2),

            mnnn: this._minDigits(inst._periods[M], 3), m1: digit(inst._periods[M], 1),

            m10: digit(inst._periods[M], 10), m100: digit(inst._periods[M], 100),

            sl: labelFor(S), sn: inst._periods[S], snn: this._minDigits(inst._periods[S], 2),

            snnn: this._minDigits(inst._periods[S], 3), s1: digit(inst._periods[S], 1),

            s10: digit(inst._periods[S], 10), s100: digit(inst._periods[S], 100)};

        var html = layout;

        // Replace period containers: {p<}...{p>}

        for (var i = 0; i < 7; i++) {

            var period = 'yowdhms'.charAt(i);

            var re = new RegExp('\\{' + period + '<\\}(.*)\\{' + period + '>\\}', 'g');

            html = html.replace(re, (inst._show[i] ? '$1' : ''));

        }

        // Replace period values: {pn}

        $.each(subs, function(n, v) {

            var re = new RegExp('\\{' + n + '\\}', 'g');

            html = html.replace(re, v);

        });

        return html;

    },

    /* Ensure a numeric value has at least n digits for display.

       @param  value  (number) the value to display

       @param  len    (number) the minimum length

       @return  (string) the display text */

    _minDigits: function(value, len) {

        value = '0000000000' + value;

        return value.substr(value.length - len);

    },

    /* Translate the format into flags for each period.

       @param  inst  (object) the current settings for this instance

       @return  (string[7]) flags indicating which periods are requested (?) or

                required (!) by year, month, week, day, hour, minute, second */

    _determineShow: function(inst) {

        var format = this._get(inst, 'format');

        var show = [];

        show[Y] = (format.match('y') ? '?' : (format.match('Y') ? '!' : null));

        show[O] = (format.match('o') ? '?' : (format.match('O') ? '!' : null));

        show[W] = (format.match('w') ? '?' : (format.match('W') ? '!' : null));

        show[D] = (format.match('d') ? '?' : (format.match('D') ? '!' : null));

        show[H] = (format.match('h') ? '?' : (format.match('H') ? '!' : null));

        show[M] = (format.match('m') ? '?' : (format.match('M') ? '!' : null));

        show[S] = (format.match('s') ? '?' : (format.match('S') ? '!' : null));

        return show;

    },

    /* Calculate the requested periods between now and the target time.

       @param  inst  (object) the current settings for this instance

       @param  show  (string[7]) flags indicating which periods are requested/required

       @param  now   (Date) the current date and time

       @return  (number[7]) the current time periods (always positive)

                by year, month, week, day, hour, minute, second */

    _calculatePeriods: function(inst, show, now) {

        // Find endpoints

        inst._now = now;

        inst._now.setMilliseconds(0);

        var until = new Date(inst._now.getTime());

        if (inst._since && now.getTime() < inst._since.getTime()) {

            inst._now = now = until;

        }

        else if (inst._since) {

            now = inst._since;

        }

        else {

            until.setTime(inst._until.getTime());

            if (now.getTime() > inst._until.getTime()) {

                inst._now = now = until;

            }

        }

        // Calculate differences by period

        var periods = [0, 0, 0, 0, 0, 0, 0];

        if (show[Y] || show[O]) {

            // Treat end of months as the same

            var lastNow = $.countdown._getDaysInMonth(now.getFullYear(), now.getMonth());

            var lastUntil = $.countdown._getDaysInMonth(until.getFullYear(), until.getMonth());

            var sameDay = (until.getDate() == now.getDate() ||

                (until.getDate() >= Math.min(lastNow, lastUntil) &&

                now.getDate() >= Math.min(lastNow, lastUntil)));

            var getSecs = function(date) {

                return (date.getHours() * 60 + date.getMinutes()) * 60 + date.getSeconds();

            };

            var months = Math.max(0,

                (until.getFullYear() - now.getFullYear()) * 12 + until.getMonth() - now.getMonth() +

                ((until.getDate() < now.getDate() && !sameDay) ||

                (sameDay && getSecs(until) < getSecs(now)) ? -1 : 0));

            periods[Y] = (show[Y] ? Math.floor(months / 12) : 0);

            periods[O] = (show[O] ? months - periods[Y] * 12 : 0);

            // Adjust for months difference and end of month if necessary

            var adjustDate = function(date, offset, last) {

                var wasLastDay = (date.getDate() == last);

                var lastDay = $.countdown._getDaysInMonth(date.getFullYear() + offset * periods[Y],

                    date.getMonth() + offset * periods[O]);

                if (date.getDate() > lastDay) {

                    date.setDate(lastDay);

                }

                date.setFullYear(date.getFullYear() + offset * periods[Y]);

                date.setMonth(date.getMonth() + offset * periods[O]);

                if (wasLastDay) {

                    date.setDate(lastDay);

                }

                return date;

            };

            if (inst._since) {

                until = adjustDate(until, -1, lastUntil);

            }

            else {

                now = adjustDate(new Date(now.getTime()), +1, lastNow);

            }

        }

        var diff = Math.floor((until.getTime() - now.getTime()) / 1000);

        var extractPeriod = function(period, numSecs) {

            periods[period] = (show[period] ? Math.floor(diff / numSecs) : 0);

            diff -= periods[period] * numSecs;

        };

        extractPeriod(W, 604800);

        extractPeriod(D, 86400);

        extractPeriod(H, 3600);

        extractPeriod(M, 60);

        extractPeriod(S, 1);

        return periods;

    }

});

/* jQuery extend now ignores nulls!

   @param  target  (object) the object to update

   @param  props   (object) the new settings

   @return  (object) the updated object */

function extendRemove(target, props) {

    $.extend(target, props);

    for (var name in props) {

        if (props[name] == null) {

            target[name] = null;

        }

    }

    return target;

}

/* Process the countdown functionality for a jQuery selection.

   @param  command  (string) the command to run (optional, default 'attach')

   @param  options  (object) the new settings to use for these countdown instances

   @return  (jQuery) for chaining further calls */

$.fn.countdown = function(options) {

    var otherArgs = Array.prototype.slice.call(arguments, 1);

    if (options == 'getTimes') {

        return $.countdown['_' + options + 'Countdown'].

            apply($.countdown, [this[0]].concat(otherArgs));

    }

    return this.each(function() {

        if (typeof options == 'string') {

            $.countdown['_' + options + 'Countdown'].apply($.countdown, [this].concat(otherArgs));

        }

        else {

            $.countdown._attachCountdown(this, options);

        }

    });

};

/* Initialise the countdown functionality. */

$.countdown = new Countdown(); // singleton instance

})(jQuery);