scw.js

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// Set up some shortcuts

function scwID(id) {
    return document.getElementById(id);
}

// Use a global variable for the return value from the next action
// IE fails to pass the function through if the target element is in
// a form and scwNextAction is not defined.

var scwNextActionReturn, scwNextAction;

// ****************************************************************************
// Start of Function Library
//
//  Exposed functions:
//
//      scwShow             Entry point for display of calendar,
//                              called in main page.
//      showCal             Legacy name of scwShow:
//                              Passes only legacy arguments,
//                              not the optional day disabling arguments.
//
//      scwShowMonth        Displays a month on the calendar,
//                              Called when a month is set or changed.
//
//      scwBeginDrag        Controls calendar dragging.
//
//      scwCancel           Called when the calendar background is clicked:
//                              Calls scwStopPropagation and may call scwHide.
//      scwHide             Hides the calendar, called on various events.
//      scwStopPropagation  Stops the propagation of an event.
//
// ****************************************************************************

function showCal(scwEle, scwSourceEle) {
    scwShow(scwEle, scwSourceEle);
}
function scwShow(scwEle, scwSourceEle)
{
    scwTriggerEle = scwSourceEle;

    // Take any parameters that there might be from the third onwards as
    // day numbers to be disabled 0 = Sunday through to 6 = Saturday.

    scwParmActiveToday = true;

    for (var i = 0; i < 7; i++)
    {
        scwPassEnabledDay[(i + 7 - scwWeekStart) % 7] = true;
        for (var j = 2; j < arguments.length; j++)
        {
            if (arguments[j] == i)
            {
                scwPassEnabledDay[(i + 7 - scwWeekStart) % 7] = false;
                if (scwDateNow.getDay() == i) scwParmActiveToday = false;
            }
        }
    }

    //   If no value is preset then the seed date is
    //      Today (when today is in range) OR
    //      The middle of the date range.

    scwSeedDate = scwDateNow;

    // Find the date and Strip space characters from start and
    // end of date input.

    if (typeof scwEle.value == 'undefined')
    {
        var scwChildNodes = scwEle.childNodes;
        for (var i = 0; i < scwChildNodes.length; i++)
            if (scwChildNodes[i].nodeType == 3)
            {
                var scwDateValue = scwChildNodes[i].nodeValue.replace(/^\s+/, '').replace(/\s+$/, '');
                if (scwDateValue.length > 0)
                {
                    scwTriggerEle.scwTextNode = scwChildNodes[i];
                    scwTriggerEle.scwLength = scwChildNodes[i].nodeValue.length;
                    break;
                }
            }
    }
    else
    {
        var scwDateValue = scwEle.value.replace(/^\s+/, '').replace(/\s+$/, '');
    }

    // Set the language-dependent elements

    scwSetDefaultLanguage();

    scwID('scwDragText').innerHTML = scwDrag;

    scwID('scwMonths').options.length = 0;
    for (var i = 0; i < scwArrMonthNames.length; i++)
        scwID('scwMonths').options[i] =
        new Option(scwArrMonthNames[i], scwArrMonthNames[i]);

    scwID('scwYears').options.length = 0;
    for (var i = 0; i < scwDropDownYears; i++)
        scwID('scwYears').options[i] =
        new Option((scwBaseYear + i), (scwBaseYear + i));

    for (var i = 0; i < scwArrWeekInits.length; i++)
        scwID('scwWeekInit' + i).innerHTML =
        scwArrWeekInits[(i + scwWeekStart) %
                        scwArrWeekInits.length];

    if (scwID('scwFoot'))
        scwID('scwFoot').innerHTML =
        scwToday + ' ' +
        scwDateNow.scwFormat(scwDateDisplayFormat);

    if (scwDateValue.length == 0)
    {// If no value is entered and today is within the range,
        // use today's date, otherwise use the middle of the valid range.

        scwBlnFullInputDate = false;

        if ((new Date(scwBaseYear + scwDropDownYears, 0, 0)) < scwSeedDate ||
            (new Date(scwBaseYear, 0, 1)) > scwSeedDate
                )
        {
            scwSeedDate = new Date(scwBaseYear +
                                   Math.floor(scwDropDownYears / 2), 5, 1);
        }
    }
    else
    {
        function scwInputFormat()
        {
            var scwArrSeed = new Array(),
                    scwArrInput = scwDateValue.
                            split(new RegExp('[\\' + scwArrDelimiters.
                            join('\\') + ']+', 'g'));

            // "Escape" all the user defined date delimiters above -
            // several delimiters will need it and it does no harm for
            // the others.

            // Strip any empty array elements (caused by delimiters)
            // from the beginning or end of the array. They will
            // still appear in the output string if in the output
            // format.

            if (scwArrInput[0] != null)
            {
                if (scwArrInput[0].length == 0) scwArrInput.splice(0, 1);

                if (scwArrInput[scwArrInput.length - 1].length == 0)
                    scwArrInput.splice(scwArrInput.length - 1, 1);
            }

            scwBlnFullInputDate = false;

            switch (scwArrInput.length)
                    {case 1:
            {// Year only entry
                scwArrSeed[0] = parseInt(scwArrInput[0], 10);
                // Year
                scwArrSeed[1] = '6';
                // Month
                scwArrSeed[2] = 1;
                // Day
                break;
            }
                case 2:
                {// Year and Month entry
                    scwArrSeed[0] =
                    parseInt(scwArrInput[scwDateInputSequence.
                            replace(/D/i, '').
                            search(/Y/i)], 10);
                    // Year
                    scwArrSeed[1] = scwArrInput[scwDateInputSequence.
                            replace(/D/i, '').
                            search(/M/i)];
                    // Month
                    scwArrSeed[2] = 1;
                    // Day
                    break;
                }
                case 3:
                {// Day Month and Year entry

                    scwArrSeed[0] =
                    parseInt(scwArrInput[scwDateInputSequence.
                            search(/Y/i)], 10);
                    // Year
                    scwArrSeed[1] = scwArrInput[scwDateInputSequence.
                            search(/M/i)];
                    // Month
                    scwArrSeed[2] =
                    parseInt(scwArrInput[scwDateInputSequence.
                            search(/D/i)], 10);
                    // Day

                    scwBlnFullInputDate = true;
                    break;
                }
                default:
                {// A stuff-up has led to more than three elements in
                    // the date.
                    scwArrSeed[0] = 0;
                    // Year
                    scwArrSeed[1] = 0;
                    // Month
                    scwArrSeed[2] = 0;
                    // Day
                }
            }

            // These regular expressions validate the input date format
            // to the following rules;
            //         Day   1-31 (optional zero on single digits)
            //         Month 1-12 (optional zero on single digits)
            //                     or case insensitive name
            //         Year  One, Two or four digits

            // Months names are as set in the language-dependent
            // definitions and delimiters are set just below there

            var scwExpValDay = /^(0?[1-9]|[1-2]\d|3[0-1])$/,
                    scwExpValMonth = new RegExp('^(0?[1-9]|1[0-2]|' +
                                                scwArrMonthNames.join('|') +
                                                ')$', 'i'),
                    scwExpValYear = /^(\d{1,2}|\d{4})$/;

            // Apply validation and report failures

            if (scwExpValYear.exec(scwArrSeed[0]) == null ||
                scwExpValMonth.exec(scwArrSeed[1]) == null ||
                scwExpValDay.exec(scwArrSeed[2]) == null
                    )
            {
                if (scwShowInvalidDateMsg)
                    alert(scwInvalidDateMsg +
                          scwInvalidAlert[0] + scwDateValue +
                          scwInvalidAlert[1]);
                scwBlnFullInputDate = false;
                scwArrSeed[0] = scwBaseYear +
                                Math.floor(scwDropDownYears / 2);
                // Year
                scwArrSeed[1] = '6';
                // Month
                scwArrSeed[2] = 1;
                // Day
            }

            // Return the  Year    in scwArrSeed[0]
            //             Month   in scwArrSeed[1]
            //             Day     in scwArrSeed[2]

            return scwArrSeed;
        }

        // Parse the string into an array using the allowed delimiters

        scwArrSeedDate = scwInputFormat();

        // So now we have the Year, Month and Day in an array.

        //   If the year is one or two digits then the routine assumes a
        //   year belongs in the 21st Century unless it is less than 50
        //   in which case it assumes the 20th Century is intended.

        if (scwArrSeedDate[0] < 100)
            scwArrSeedDate[0] += (scwArrSeedDate[0] > 50) ? 1900 : 2000;

        // Check whether the month is in digits or an abbreviation

        if (scwArrSeedDate[1].search(/\d+/) != 0)
        {
            month = scwArrMonthNames.join('|').toUpperCase().
                    search(scwArrSeedDate[1].substr(0, 3).
                    toUpperCase());
            scwArrSeedDate[1] = Math.floor(month / 4) + 1;
        }

        scwSeedDate = new Date(scwArrSeedDate[0],
                scwArrSeedDate[1] - 1,
                scwArrSeedDate[2]);
    }

    // Test that we have arrived at a valid date

    if (isNaN(scwSeedDate))
    {
        if (scwShowInvalidDateMsg)
            alert(scwInvalidDateMsg +
                  scwInvalidAlert[0] + scwDateValue +
                  scwInvalidAlert[1]);
        scwSeedDate = new Date(scwBaseYear +
                               Math.floor(scwDropDownYears / 2), 5, 1);
        scwBlnFullInputDate = false;
    }
    else
    {// Test that the date is within range,
        // if not then set date to a sensible date in range.

        if ((new Date(scwBaseYear, 0, 1)) > scwSeedDate)
        {
            if (scwBlnStrict && scwShowOutOfRangeMsg)
                alert(scwOutOfRangeMsg);
            scwSeedDate = new Date(scwBaseYear, 0, 1);
            scwBlnFullInputDate = false;
        }
        else
        {
            if ((new Date(scwBaseYear + scwDropDownYears, 0, 0)) <
                scwSeedDate)
            {
                if (scwBlnStrict && scwShowOutOfRangeMsg)
                    alert(scwOutOfRangeMsg);
                scwSeedDate = new Date(scwBaseYear +
                                       Math.floor(scwDropDownYears) - 1,
                        11, 1);
                scwBlnFullInputDate = false;
            }
            else
            {
                if (scwBlnStrict && scwBlnFullInputDate &&
                    (scwSeedDate.getDate() != scwArrSeedDate[2] ||
                     (scwSeedDate.getMonth() + 1) != scwArrSeedDate[1] ||
                     scwSeedDate.getFullYear() != scwArrSeedDate[0]
                            )
                        )
                {
                    if (scwShowDoesNotExistMsg) alert(scwDoesNotExistMsg);
                    scwSeedDate = new Date(scwSeedDate.getFullYear(),
                            scwSeedDate.getMonth() - 1, 1);
                    scwBlnFullInputDate = false;
                }
            }
        }
    }

    // Test the disabled dates for validity
    // Give error message if not valid.

    for (var i = 0; i < scwDisabledDates.length; i++)
    {
        if (!((typeof scwDisabledDates[i] == 'object') &&
              (scwDisabledDates[i].constructor == Date)))
        {
            if ((typeof scwDisabledDates[i] == 'object') &&
                (scwDisabledDates[i].constructor == Array))
            {
                var scwPass = true;