Mega Code Archive
Displaying the Calendar
<![CDATA[
/*
Mastering JavaScript, Premium Edition
by James Jaworski
ISBN:078212819X
Publisher Sybex CopyRight 2001
*/
<HTML>
<HEAD>
<TITLE>Monthly Calendar</TITLE>
<SCRIPT LANGUAGE="JavaScript" ><!--
function Calendar() {
var len = Calendar.arguments.length
if(len == 2){
this.month = Calendar.arguments[0]
this.year = Calendar.arguments[1]
}else{
today = new Date()
this.month = today.getMonth()
this.year = today.getFullYear()
}
this.display = displayCalendar
}
function displayCalendar() {
document.writeln("<TABLE BORDER='0' BGCOLOR='white'>")
displayCalendarHeader(this.month,this.year)
if(displayCalendar.arguments.length>0){
var day = displayCalendar.arguments[0]-1
displayDates(day,this.month,this.year,true)
}else displayDates(0,this.month,this.year,false)
document.writeln("</TABLE>")
}
function displayCalendarHeader(month,year) {
var days = new Array("Sun","Mon","Tue","Wed","Thu",
"Fri","Sat")
var months = new Array("January","February","March","April",
"May","June","July","August","September","October",
"November","December")
document.writeln("<TR><TH COLSPAN='7'><H2 ALIGN='CENTER'>")
document.writeln(months[month])
document.writeln(year+"</H2></TH></TR>")
document.writeln("<TR>")
for(var i=0;i<days.length;++i)
document.writeln("<TH> "+days[i]+" </TH>")
document.writeln("</TR>")
}
function displayDates(day,month,year,shade) {
d = new Date(year,month,1)
var startDay = d.getDay()
var numDays = numberOfDays(month,year)
var numRows = Math.floor((numDays+startDay)/7)
if((numDays+startDay)%7 > 1) ++numRows
var currentDate=0
for(var i=0;i<numRows;++i) {
document.writeln("<TR>")
for(var j=0;j<7;++j) {
if(shade && day==currentDate)
document.write("<TD BGCOLOR='red'>")
else document.write("<TD>")
if(currentDate>=numDays) document.write(" ")
else if(currentDate>0){
++currentDate
writeDate(currentDate)
}else if(i*7+j>=startDay){
++currentDate
writeDate(currentDate)
}else document.write(" ")
document.writeln("</TD>")
}
document.writeln("</TR>")
}
}
function numberOfDays(month,year) {
var numDays=new Array(31,28,31,30,31,30,31,31,30,31,30,31)
n = numDays[month]
if(month == 1 && year % 4 == 0) ++n
return n
}
function writeDate(n) {
document.write("<H3 ALIGN='CENTER'>"+n+"</H3>")
}
// --></SCRIPT>
</HEAD>
<BODY>
<SCRIPT LANGUAGE="JavaScript"><!--
cal=new Calendar()
cal.display()
// --></SCRIPT>
</BODY>
</HTML>
]]>