/**

version 1.5

December 4, 2005

Julian Robichaux -- http://www.nsftools.com

*/

var datePickerDivID = "datepicker";

var iFrameDivID = "datepickeriframe";

var dayArrayShort = new Array('Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa');

var dayArrayMed = new Array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');

var dayArrayLong = new Array('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday');

var monthArrayShort = new Array('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec');

var monthArrayMed = new Array('Jan', 'Feb', 'Mar', 'Apr', 'May', 'June', 'July', 'Aug', 'Sept', 'Oct', 'Nov', 'Dec');

var monthArrayLong = new Array('January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December');

// these variables define the date formatting we're expecting and outputting.

// If you want to use a different format by default, change the defaultDateSeparator

// and defaultDateFormat variables either here or on your HTML page.

var defaultDateSeparator = "/"; // common values would be "/" or "."

var defaultDateFormat = "mdy" // valid values are "mdy", "dmy", and "ymd"

var dateSeparator = defaultDateSeparator;

var dateFormat = defaultDateFormat;

/**

This is the main function you'll call from the onClick event of a button.

*/

function displayDatePicker(dateFieldName, displayBelowThisObject, jumpFieldName, jumpTitle, dtFormat, dtSep)

{

var targetDateField = document.getElementsByName (dateFieldName).item(0);

// if we weren't told what node to display the datepicker beneath, just display it

// beneath the date field we're updating

if (!displayBelowThisObject)

displayBelowThisObject = targetDateField;

// if a date separator character was given, update the dateSeparator variable

if (dtSep)

dateSeparator = dtSep;

else

dateSeparator = defaultDateSeparator;

// if a date format was given, update the dateFormat variable

if (dtFormat)

dateFormat = dtFormat;

else

dateFormat = defaultDateFormat;

var x = displayBelowThisObject.offsetLeft;

var y = displayBelowThisObject.offsetTop + displayBelowThisObject.offsetHeight ;

// deal with elements inside tables and such

var parent = displayBelowThisObject;

while (parent.offsetParent) {

parent = parent.offsetParent;

x += parent.offsetLeft;

y += parent.offsetTop ;

}

drawDatePicker(targetDateField, x, y, jumpFieldName, jumpTitle);

}

/**

Draw the datepicker object (which is just a table with calendar elements) at the

specified x and y coordinates, using the targetDateField object as the input tag

that will ultimately be populated with a date.

This function will normally be called by the displayDatePicker function.

*/

function drawDatePicker(targetDateField, x, y, jumpFieldName, jumpTitle)

{

var dt = getFieldDate(targetDateField.value );

// the datepicker table will be drawn inside of a <div> with an ID defined by the

// global datePickerDivID variable. If such a div doesn't yet exist on the HTML

// document we're working with, add one.

if (!document.getElementById(datePickerDivID)) {

// don't use innerHTML to update the body, because it can cause global variables

// that are currently pointing to objects on the page to have bad references

//document.body.innerHTML += "<div id='" + datePickerDivID + "' class='dpDiv'></div>";

var newNode = document.createElement("div");

newNode.setAttribute("id", datePickerDivID);

newNode.setAttribute("class", "dpDiv");

newNode.setAttribute("style", "visibility: hidden;");

document.body.appendChild(newNode);

}

// move the datepicker div to the proper x,y coordinate and toggle the visiblity

var pickerDiv = document.getElementById(datePickerDivID);

pickerDiv.style.position = "absolute";

pickerDiv.style.left = x + "px";

pickerDiv.style.top = y + "px";

pickerDiv.style.visibility = (pickerDiv.style.visibility == "visible" ? "hidden" : "visible");

pickerDiv.style.display = (pickerDiv.style.display == "block" ? "none" : "block");

pickerDiv.style.zIndex = 10000;

// draw the datepicker table

refreshDatePicker(targetDateField.name, dt.getFullYear(), dt.getMonth(), dt.getDate(), jumpFieldName, jumpTitle);

}

/**

This is the function that actually draws the datepicker calendar.

*/

function refreshDatePicker(dateFieldName, year, month, day, jumpFieldName, jumpTitle)

{

// if no arguments are passed, use today's date; otherwise, month and year

// are required (if a day is passed, it will be highlighted later)

var thisDay = new Date();

if ((month >= 0) && (year > 0)) {

thisDay = new Date(year, month, 1);

} else {

day = thisDay.getDate();

thisDay.setDate(1);

}

// the calendar will be drawn as a table

// you can customize the table elements with a global CSS style sheet,

// or by hardcoding style and formatting elements below

var crlf = "\r\n";

var TABLE = "<table cols=7 class='dpTable'>" + crlf;

var xTABLE = "</table>" + crlf;

var TR = "<tr class='dpTR'>";

var TR_title = "<tr class='dpTitleTR'>";

var TR_days = "<tr class='dpDayTR'>";

var TR_todaybutton = "<tr class='dpTodayButtonTR'>";

var xTR = "</tr>" + crlf;

var TD = "<td class='dpTD' onMouseOut='this.className=\"dpTD\";' onMouseOver=' this.className=\"dpTDHover\";' "; // leave this tag open, because we'll be adding an onClick event

var TD_title = "<td colspan=5 class='dpTitleTD'>";

var TD_buttons = "<td class='dpButtonTD'>";

var TD_todaybutton = "<td colspan=7 class='dpTodayButtonTD'>";

var TD_days = "<td class='dpDayTD'>";

var TD_selected = "<td class='dpDayHighlightTD' onMouseOut='this.className=\"dpDayHighlightTD\";' onMouseOver='this.className=\"dpTDHover\";' "; // leave this tag open, because we'll be adding an onClick event

var xTD = "</td>" + crlf;

var DIV_title = "<div class='dpTitleText'>";

var DIV_selected = "<div class='dpDayHighlight'>";

var xDIV = "</div>";

// start generating the code for the calendar table

var html = TABLE;

// this is the title bar, which displays the month and the buttons to

// go back to a previous month or forward to the next month

html += TR_title;

html += TD_buttons + getButtonCode(dateFieldName, thisDay, -1, "&lt;") + xTD;

html += TD_title + DIV_title + monthArrayLong[ thisDay.getMonth()] + " " + thisDay.getFullYear() + xDIV + xTD;

html += TD_buttons + getButtonCode(dateFieldName, thisDay, 1, "&gt;") + xTD;

html += xTR;

// this is the row that indicates which day of the week we're on

html += TR_days;

for(i = 0; i < dayArrayShort.length; i++)

html += TD_days + dayArrayShort[i] + xTD;

html += xTR;

// now we'll start populating the table with days of the month

html += TR;

// first, the leading blanks

for (i = 0; i < thisDay.getDay(); i++)

html += TD + "&nbsp;" + xTD;

// now, the days of the month

do {

dayNum = thisDay.getDate();

TD_onclick = " onclick=\"updateDateField('" + dateFieldName + "', '" + getDateString(thisDay) + "');\">";

if (dayNum == day)

html += TD_selected + TD_onclick + DIV_selected + dayNum + xDIV + xTD;

else

html += TD + TD_onclick + dayNum + xTD;

// if this is a Saturday, start a new row

if (thisDay.getDay() == 6)

html += xTR + TR;

// increment the day

thisDay.setDate(thisDay.getDate() + 1);

} while (thisDay.getDate() > 1)

// fill in any trailing blanks

if (thisDay.getDay() > 0) {

for (i = 6; i > thisDay.getDay(); i--)

html += TD + "&nbsp;" + xTD;

}

html += xTR;

// add a button to allow the user to easily return to today, or close the calendar

var today = new Date();

var todayString = "Today is " + dayArrayMed[today.getDay()] + ", " + monthArrayMed[ today.getMonth()] + " " + today.getDate();

html += TR_todaybutton + TD_todaybutton;

if (jumpFieldName) {

var dtj = getFieldDate(document.getElementsByName (jumpFieldName).item(0).value );

html += "<button class='dpTodayButton' onClick='refreshDatePicker(\"" + dateFieldName + "\","+ dtj.getFullYear()+ ","+ dtj.getMonth()+ ","+dtj.getDate()+ ",\""+jumpFieldName+ "\",\""+ jumpTitle + "\");'>"+jumpTitle+"</button> ";

html += "<button class='dpTodayButton' onClick='refreshDatePicker(\"" + dateFieldName + "\",0,0,0,\""+jumpFieldName+ "\",\""+ jumpTitle + "\");'>this month</button><br/> ";

} else {

html += "<button class='dpTodayButton' onClick='refreshDatePicker(\"" + dateFieldName + "\");'>this month</button> ";

}

html += "<button class='dpTodayButton' onClick='updateDateField(\"" + dateFieldName + "\");'>close</button>";

html += xTD + xTR;

// and finally, close the table

html += xTABLE;

document.getElementById(datePickerDivID).innerHTML = html;

// add an "iFrame shim" to allow the datepicker to display above selection lists

adjustiFrame();

}

/**

Convenience function for writing the code for the buttons that bring us back or forward

a month.

*/

function getButtonCode(dateFieldName, dateVal, adjust, label)

{

var newMonth = (dateVal.getMonth () + adjust) % 12;

var newYear = dateVal.getFullYear() + parseInt((dateVal.getMonth() + adjust) / 12);

if (newMonth < 0) {

newMonth += 12;

newYear += -1;

}

return "<button class='dpButton' onClick='refreshDatePicker(\"" + dateFieldName + "\", " + newYear + ", " + newMonth + ");'>" + label + "</button>";

}

/**

Convert a JavaScript Date object to a string, based on the dateFormat and dateSeparator

variables at the beginning of this script library.

*/

function getDateString(dateVal)

{

var dayString = "00" + dateVal.getDate();

var monthString = "00" + (dateVal.getMonth()+1);

dayString = dayString.substring(dayString.length - 2);

monthString = monthString.substring(monthString.length - 2);

switch (dateFormat) {

case "dmy" :

return dayString + dateSeparator + monthString + dateSeparator + dateVal.getFullYear();

case "ymd" :

return dateVal.getFullYear() + dateSeparator + monthString + dateSeparator + dayString;

case "mdy" :

default :

return monthString + dateSeparator + dayString + dateSeparator + dateVal.getFullYear();

}

}

/**

Convert a string to a JavaScript Date object.

*/

function getFieldDate(dateString)

{

var dateVal;

var dArray;

var d, m, y;

try {

dArray = splitDateString(dateString);

if (dArray) {

switch (dateFormat) {

case "dmy" :

d = parseInt(dArray[0], 10);

m = parseInt(dArray[1], 10) - 1;

y = parseInt(dArray[2], 10);

break;

case "ymd" :

d = parseInt(dArray[2], 10);

m = parseInt(dArray[1], 10) - 1;

y = parseInt(dArray[0], 10);

break;

case "mdy" :

default :

d = parseInt(dArray[1], 10);

m = parseInt(dArray[0], 10) - 1;

y = parseInt(dArray[2], 10);

break;

}

dateVal = new Date(y, m, d);

} else if (dateString) {

dateVal = new Date(dateString);

} else {

dateVal = new Date();

}

} catch(e) {

dateVal = new Date();

}

return dateVal;

}

/**

Try to split a date string into an array of elements, using common date separators.

If the date is split, an array is returned; otherwise, we just return false.

*/

function splitDateString(dateString)

{

var dArray;

if (dateString.indexOf("/") >= 0)

dArray = dateString.split("/");

else if (dateString.indexOf(".") >= 0)

dArray = dateString.split(".");

else if (dateString.indexOf("-") >= 0)

dArray = dateString.split("-");

else if (dateString.indexOf("\\") >= 0)

dArray = dateString.split("\\");

else

dArray = false;

return dArray;

}

function updateDateField(dateFieldName, dateString)

{

var targetDateField = document.getElementsByName (dateFieldName).item(0);

if (dateString) {

targetDateField.value = dateString;

if (targetDateField.dispatchEvent) {

targetDateField.dispatchEvent(new Event('input'));

}

}

var pickerDiv = document.getElementById(datePickerDivID);

pickerDiv.style.visibility = "hidden";

pickerDiv.style.display = "none";

adjustiFrame();

targetDateField.focus();

// after the datepicker has closed, optionally run a user-defined function called

// datePickerClosed, passing the field that was just updated as a parameter

// (note that this will only run if the user actually selected a date from the datepicker)

if ((dateString) && (typeof(datePickerClosed) == "function"))

datePickerClosed(targetDateField);

}

/**

Use an "iFrame shim" to deal with problems where the datepicker shows up behind

selection list elements, if they're below the datepicker. The problem and solution are

described at:

http://dotnetjunkies.com/WebLog/jking/archive/2003/07/21/488.aspx

http://dotnetjunkies.com/WebLog/jking/archive/2003/10/30/2975.aspx

*/

function adjustiFrame(pickerDiv, iFrameDiv)

{

// we know that Opera doesn't like something about this, so if we

// think we're using Opera, don't even try

var is_opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1);

if (is_opera)

return;

// put a try/catch block around the whole thing, just in case

try {

if (!document.getElementById(iFrameDivID)) {

// don't use innerHTML to update the body, because it can cause global variables

// that are currently pointing to objects on the page to have bad references

//document.body.innerHTML += "<iframe id='" + iFrameDivID + "' src='javascript:false;' scrolling='no' frameborder='0'>";

var newNode = document.createElement("iFrame");

newNode.setAttribute("id", iFrameDivID);

newNode.setAttribute("src", "javascript:false;");

newNode.setAttribute("scrolling", "no");

newNode.setAttribute ("frameborder", "0");

document.body.appendChild(newNode);

}

if (!pickerDiv)

pickerDiv = document.getElementById(datePickerDivID);

if (!iFrameDiv)

iFrameDiv = document.getElementById(iFrameDivID);

try {

iFrameDiv.style.position = "absolute";

iFrameDiv.style.width = pickerDiv.offsetWidth;

iFrameDiv.style.height = pickerDiv.offsetHeight ;

iFrameDiv.style.top = pickerDiv.style.top;

iFrameDiv.style.left = pickerDiv.style.left;

iFrameDiv.style.zIndex = pickerDiv.style.zIndex - 1;

iFrameDiv.style.visibility = pickerDiv.style.visibility ;

iFrameDiv.style.display = pickerDiv.style.display;

} catch(e) {

}

} catch (ee) {

}

}