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/**

This is a JavaScript library that will allow you to easily add some basic DHTML

drop-down datepicker functionality to your Notes forms. This script is not as

full-featured as others you may find on the Internet, but it's free, it's easy to

understand, and it's easy to change.

You'll also want to include a stylesheet that makes the datepicker elements

look nice. An example one can be found in the database that this script was

originally released with, at:

http://www.nsftools.com/tips/NotesTips.htm#datepicker

I've tested this lightly with Internet Explorer 6 and Mozilla Firefox. I have no idea

how compatible it is with other browsers.

version 1.5

December 4, 2005

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

HISTORY

--  version 1.0 (Sept. 4, 2004):

Initial release.

--  version 1.1 (Sept. 5, 2004):

Added capability to define the date format to be used, either globally (using the

defaultDateSeparator and defaultDateFormat variables) or when the displayDatePicker

function is called.

--  version 1.2 (Sept. 7, 2004):

Fixed problem where datepicker x-y coordinates weren't right inside of a table.

Fixed problem where datepicker wouldn't display over selection lists on a page.

Added a call to the datePickerClosed function (if one exists) after the datepicker

is closed, to allow the developer to add their own custom validation after a date

has been chosen. For this to work, you must have a function called datePickerClosed

somewhere on the page, that accepts a field object as a parameter. See the

example in the comments of the updateDateField function for more details.

--  version 1.3 (Sept. 9, 2004)

Fixed problem where adding the <div> and <iFrame> used for displaying the datepicker

was causing problems on IE 6 with global variables that had handles to objects on

the page (I fixed the problem by adding the elements using document.createElement()

and document.body.appendChild() instead of document.body.innerHTML += ...).

--  version 1.4 (Dec. 20, 2004)

Added "targetDateField.focus();" to the updateDateField function (as suggested

by Alan Lepofsky) to avoid a situation where the cursor focus is at the top of the

form after a date has been picked. Added "padding: 0px;" to the dpButton CSS

style, to keep the table from being so wide when displayed in Firefox.

-- version 1.5 (Dec 4, 2005)

Added display=none when datepicker is hidden, to fix problem where cursor is

not visible on input fields that are beneath the date picker. Added additional null

date handling for date errors in Safari when the date is empty. Added additional

error handling for iFrame creation, to avoid reported errors in Opera. Added

onMouseOver event for day cells, to allow color changes when the mouse hovers

over a cell (to make it easier to determine what cell you're over). Added comments

in the style sheet, to make it more clear what the different style elements are for.

*/

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.

Normally, you'll have something like this on your HTML page:

Start Date: <input name="StartDate">

<input type=button value="select" onclick="displayDatePicker('StartDate');">

That will cause the datepicker to be displayed beneath the StartDate field and

any date that is chosen will update the value of that field. If you'd rather have the

datepicker display beneath the button that was clicked, you can code the button

like this:

<input type=button value="select" onclick="displayDatePicker('StartDate', this);">

So, pretty much, the first argument (dateFieldName) is a string representing the

name of the field that will be modified if the user picks a date, and the second

argument (displayBelowThisObject) is optional and represents an actual node

on the HTML document that the datepicker should be displayed below.

In version 1.1 of this code, the dtFormat and dtSep variables were added, allowing

you to use a specific date format or date separator for a given call to this function.

Normally, you'll just want to set these defaults globally with the defaultDateSeparator

and defaultDateFormat variables, but it doesn't hurt anything to add them as optional

parameters here. An example of use is:

<input type=button value="select" onclick="displayDatePicker('StartDate', false, 'dmy', '.');">

This would display the datepicker beneath the StartDate field (because the

displayBelowThisObject parameter was false), and update the StartDate field with

the chosen value of the datepicker using a date format of dd.mm.yyyy

*/

function displayDatePicker(dateFieldName, displayBelowThisObject, 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);

}

/**

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)

{

  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());

}

/**

This is the function that actually draws the datepicker calendar.

*/

function refreshDatePicker(dateFieldName, year, month, day)

{

  // 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, "<") + xTD;

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

  html += TD_buttons + getButtonCode(dateFieldName, thisDay, 1, ">") + 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 + " " + 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 + " " + 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;

  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;

}

/**

Update the field with the given dateFieldName with the dateString that has been passed,

and hide the datepicker. If no dateString is passed, just close the datepicker without

changing the field value.

Also, if the page developer has defined a function called datePickerClosed anywhere on

the page or in an imported library, we will attempt to run that function with the updated

field as a parameter. This can be used for such things as date validation, setting default

values for related fields, etc. For example, you might have a function like this to validate

a start date field:

function datePickerClosed(dateField)

{

  var dateObj = getFieldDate(dateField.value);

  var today = new Date();

  today = new Date(today.getFullYear(), today.getMonth(), today.getDate());

  if (dateField.name == "StartDate") {

    if (dateObj < today) {

      // if the date is before today, alert the user and display the datepicker again

      alert("Please enter a date that is today or later");

      dateField.value = "";

      document.getElementById(datePickerDivID).style.visibility = "visible";

      adjustiFrame();

    } else {

      // if the date is okay, set the EndDate field to 7 days after the StartDate

      dateObj.setTime(dateObj.getTime() + (7 * 24 * 60 * 60 * 1000));

      var endDateField = document.getElementsByName ("EndDate").item(0);

      endDateField.value = getDateString(dateObj);

    }

  }

}

*/

function updateDateField(dateFieldName, dateString)

{

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

  if (dateString)

    targetDateField.value = dateString;

  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) {

  }

}