simplecalendar.js

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	/*
	*****************************************************************************************************
	Author : Lea Smart
	Source : www.totallysmartit.com
	Date : 7/3/2001
	DHTML Calendar
	Version 1.2
	
	You are free to use this code if you retain this header.
	You do not need to link to my site (be nice though!)
	
	Amendments
	22 Jan 2002; Added ns resize bug code; rewrote date functions into Date 'class';
				 Added support for yyyy-mm-dd date format
				 Added support for calendar beginning on any day
	7th Feb 2002 Fixed day highlight when year wasn't current year bug
	9th Jun 2002 Fixed bug with weekend colour
				 Amended the code for the date functions extensions.  Shortened addDays code considerably
	*****************************************************************************************************
	*/
	var timeoutDelay = 2000; // milliseconds, change this if you like, set to 0 for the calendar to never auto disappear
	var g_startDay = 0// 0=sunday, 1=monday
	
	// preload images
	var imgUp = new Image(8,12);
	//imgUp.src = 'images/up.gif';
	var imgDown = new Image(8,12);
	//imgDown.src = 'images/down.gif';
	
	// used by timeout auto hide functions
	var timeoutId = false;
	
	// the now standard browser sniffer class
	function Browser(){
	  this.dom = document.getElementById?1:0;
	  this.ie4 = (document.all && !this.dom)?1:0;
	  this.ns4 = (document.layers && !this.dom)?1:0;
	  this.ns6 = (this.dom && !document.all)?1:0;
	  this.ie5 = (this.dom && document.all)?1:0;
	  this.ok = this.dom || this.ie4 || this.ns4;
	  this.platform = navigator.platform;
	}
	var browser = new Browser();
		
	// dom browsers require this written to the HEAD section
	
	if (browser.dom || browser.ie4){
	    document.writeln('<style>');
		document.writeln('#container {');
		document.writeln('position : absolute;');
		document.writeln('left : 100px;');
		document.writeln('top : 100px;');
		document.writeln('width : 124px;');;
		browser.platform=='Win32'?height=140:height=145;
		document.writeln('height : ' + height +'px;');
		document.writeln('clip:rect(0px 124px ' + height + 'px 0px);');
		//document.writeln('overflow : hidden;');
		document.writeln('visibility : hidden;');
		document.writeln('background-color : #ffffff');
		document.writeln('}');
		document.writeln('</style>')
		document.write('<div id="container"');
		if (timeoutDelay) document.write(' onmouseout="calendarTimeout();" onmouseover="if (timeoutId) clearTimeout(timeoutId);"');
		document.write('></div>');
	}
	
	var g_Calendar;  // global to hold the calendar reference, set by constructor
	
	function calendarTimeout(){
	  if (browser.ie4 || browser.ie5){
	    if (window.event.srcElement && window.event.srcElement.name!='month') timeoutId=setTimeout('g_Calendar.hide();',timeoutDelay);
	  }
	  if (browser.ns6 || browser.ns4){
	    timeoutId=setTimeout('g_Calendar.hide();',timeoutDelay);
	  }
	}
	
	// constructor for calendar class
	function Calendar(){
	  g_Calendar = this;
	  // some constants needed throughout the program
	  this.daysOfWeek = new Array("Su","Mo","Tu","We","Th","Fr","Sa");
	  this.months = new Array("January","February","March","April","May","June","July","August","September","October","November","December");
	  this.daysInMonth = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
	  
	  if (browser.ns4){
	    var tmpLayer = new Layer(127);
		if (timeoutDelay){
		  tmpLayer.captureEvents(Event.MOUSEOVER | Event.MOUSEOUT);
		  tmpLayer.onmouseover = function(event) { if (timeoutId) clearTimeout(timeoutId); };
		  tmpLayer.onmouseout = function(event) { timeoutId=setTimeout('g_Calendar.hide()',timeoutDelay);};
		}
	    tmpLayer.x = 100;
	    tmpLayer.y = 100;
	    tmpLayer.bgColor = "#ffffff";
	  }
	  if (browser.dom || browser.ie4){
		var tmpLayer = browser.dom?document.getElementById('container'):document.all.container;
	  }
	  this.containerLayer = tmpLayer;
	  if (browser.ns4 && browser.platform=='Win32') {
	    this.containerLayer.clip.height=134;
	    this.containerLayer.clip.width=127;
	  }

	}
	
 	Calendar.prototype.getFirstDOM = function() {
		var thedate = new Date();
		thedate.setDate(1);
		thedate.setMonth(this.month);
		thedate.setFullYear(this.year);
		return thedate.getDay();
	}

	Calendar.prototype.getDaysInMonth = function (){
	   if (this.month!=1) {
	   return this.daysInMonth[this.month]
	   }
	   else {
	     // is it a leap year
		    if (Date.isLeapYear(this.year)) {
			  return 29;
			}
		    else {
			  return 28;
			}
	   }
	}
	 
	Calendar.prototype.buildString = function(){
	  var tmpStr = '<form onSubmit="this.year.blur();return false;"><table width="100%" border="0" cellspacing="0" cellpadding="2" class="calBorderColor"><tr><td valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="1" class="calBgColor">';
	  tmpStr += '<tr>';
	  tmpStr += '<td width="60%" class="cal" align="left">';
	  if (this.hasDropDown) {
	    tmpStr += '<select class="month" name="month" onchange="g_Calendar.selectChange();">';
		for (var i=0;i<this.months.length;i++){
	      tmpStr += '<option value="' + i + '"' 
		  if (i == this.month) tmpStr += ' selected';
		  tmpStr += '>' + this.months[i] + '</option>';
	    }
	    tmpStr += '</select>';
	  } else {
	    tmpStr += '<table border="0" cellspacing="0" cellpadding="0"><tr><td><a href="javascript: g_Calendar.changeMonth(-1);"><img name="calendar" src="" width="8" height="12" border="0" alt=""></a></td><td class="cal" width="100%" align="center">' + this.months[this.month] + '</td><td class="cal"><a href="javascript: g_Calendar.changeMonth(+1);"><img name="calendar" src="" width="8" height="12" border="0" alt=""></a></td></tr></table>';
	  }
	  tmpStr += '</td>';
	  /* observation : for some reason if the below event is changed to 'onChange' rather than 'onBlur' it totally crashes IE (4 and 5)!
	  */
	  tmpStr += '<td width="40%" align="right" class="cal">';
	  
	  if (this.hasDropDown) { 
	    tmpStr += '<input class="year" type="text" size="';
	    // get round NS4 win32 lenght of year input problem
	    (browser.ns4 && browser.platform=='Win32')?tmpStr += 1:tmpStr += 4;
	  tmpStr += '" name="year" maxlength="4" onBlur="g_Calendar.inputChange();" value="' + this.year + '">';
	  } else {
	  tmpStr += '<table border="0" cellspacing="0" cellpadding="0"><tr><td class="cal"><a href="javascript: g_Calendar.changeYear(-1);"><img name="calendar" src="" width="8" height="12" border="0" alt=""></a></td><td class="cal" width="100%" align="center">' + this.year + '</td><td class="cal"><a href="javascript: g_Calendar.changeYear(+1);"><img name="calendar" src="" width="8" height="12" border="0" alt=""></a></td></tr></table>'
	  }
	  tmpStr += '</td>';
	  tmpStr += '</tr>';
	  tmpStr += '</table>';
	  var iCount = 1;

	  var iFirstDOM = (7+this.getFirstDOM()-g_startDay)%7; // to prevent calling it in a loop

	  var iDaysInMonth = this.getDaysInMonth(); // to prevent calling it in a loop
	  
	  tmpStr += '<table width="100%" border="0" cellspacing="0" cellpadding="1" class="calBgColor">';
	  tmpStr += '<tr>';
	    for (var i=0;i<7;i++){
		  tmpStr += '<td align="center" class="calDaysColor">' + this.daysOfWeek[(g_startDay+i)%7] + '</td>';
		}
	  tmpStr += '</tr>';
	  var tmpFrom = parseInt('' + this.dateFromYear + this.dateFromMonth + this.dateFromDay,10);
	  var tmpTo = parseInt('' + this.dateToYear + this.dateToMonth + this.dateToDay,10);
	  var tmpCompare;
	  for (var j=1;j<=6;j++){
	     tmpStr += '<tr>';
	     for (var i=1;i<=7;i++){
		   tmpStr += '<td width="16" align="center" '
		   if ( (7*(j-1) + i)>=iFirstDOM+1  && iCount <= iDaysInMonth){
		     if (iCount==this.day && this.year==this.oYear && this.month==this.oMonth) tmpStr += 'class="calHighlightColor"';
			 else {
			    if (i==7-g_startDay || i==((7-g_startDay)%7)+1) tmpStr += 'class="calWeekend"';
				else tmpStr += 'class="cal"';
			 }
		     tmpStr += '>';
			 /* could create a date object here and compare that but probably more efficient to convert to a number
			   and compare number as numbers are primitives */
			 tmpCompare = parseInt('' + this.year + padZero(this.month) + padZero(iCount),10);
			 if (tmpCompare >= tmpFrom && tmpCompare <= tmpTo) {
			   tmpStr += '<a class="cal" href="javascript: g_Calendar.clickDay(' + iCount + ');">' + iCount + '</a>';
			 } else {
			   tmpStr += '<span class="disabled">' + iCount + '</span>';
			 }
			 iCount++;
		   } else {
		     if  (i==7-g_startDay || i==((7-g_startDay)%7)+1) tmpStr += 'class="calWeekend"'; else tmpStr +='class="cal"';
			 tmpStr += '>&nbsp;';
		   }
		   tmpStr += '</td>'
		 }
		 tmpStr += '</tr>'
	  }
	  tmpStr += '</table></td></tr></table></form>'
	  return tmpStr;
	}
	
	Calendar.prototype.selectChange = function(){
	  this.month = browser.ns6?this.containerLayer.ownerDocument.forms[0].month.selectedIndex:this.containerLayer.document.forms[0].month.selectedIndex;
	  this.writeString(this.buildString());
	}
	
	Calendar.prototype.inputChange = function(){
	  var tmp = browser.ns6?this.containerLayer.ownerDocument.forms[0].year:this.containerLayer.document.forms[0].year;
	  if (tmp.value >=1900 || tmp.value <=2100){
	    this.year = tmp.value;
	    this.writeString(this.buildString());
	  } else {
	    tmp.value = this.year;
	  }
	}
	Calendar.prototype.changeYear = function(incr){
	   (incr==1)?this.year++:this.year--;
	   this.writeString(this.buildString());
	}
	Calendar.prototype.changeMonth = function(incr){
	    if (this.month==11 && incr==1){
	      this.month = 0;
	  	  this.year++;