A Static Calendar by JavaScript

A Static Calendar by JavaScript : Calendar : GUI Components JAVASCRIPT DHTML TUTORIALS

JAVASCRIPT DHTML TUTORIALS » GUI Components » Calendar »

A Static Calendar by JavaScript





/*
JavaScript Bible, Fourth Edition
by Danny Goodman 

John Wiley & Sons CopyRight 2001
*/

<HTML>
<HEAD>
<TITLE>JavaScripted Static Table</TITLE>
<SCRIPT LANGUAGE="JavaScript">
// function becomes a method for each month object
function getFirstDay(theYear, theMonth){
    var firstDate = new Date(theYear,theMonth,1)
    return firstDate.getDay() + 1
}
// number of days in the month
function getMonthLen(theYear, theMonth) {
    var oneDay = 1000 * 60 * 60 * 24
    var thisMonth = new Date(theYear, theMonth, 1)
    var nextMonth = new Date(theYear, theMonth + 1, 1)
    var len = Math.ceil((nextMonth.getTime() - 
        thisMonth.getTime())/oneDay)
    return len
}
// correct for Y2K anomalies
function getY2KYear(today) {
    var yr = today.getYear()
    return ((yr < 1900) ? yr+1900 : yr)
}
// create basic array
theMonths = new MakeArray(12)
// load array with English month names
function MakeArray(n) {
    this[0] = "January"
    this[1] = "February"
    this[2] = "March"
    this[3] = "April"
    this[4] = "May"
    this[5] = "June"
    this[6] = "July"
    this[7] = "August"
    this[8] = "September"
    this[9] = "October"
    this[10] = "November"
    this[11] = "December"
    this.length = n
    return this
}
// end -->
</SCRIPT>
</HEAD>

<BODY>
<H1>Month at a Glance (Static)</H1>
<HR>
<SCRIPT LANGUAGE="JavaScript">
<!-- start
// initialize some variables for later
var today = new Date()
var theYear = getY2KYear(today)
var theMonth = today.getMonth() // for index into our array

// which is the first day of this month?
var firstDay = getFirstDay(theYear, theMonth)
// total number of <TD>...</TD> tags needed in for loop below
var howMany = getMonthLen(theYear, theMonth) + firstDay

// start assembling HTML for table
var content = "<CENTER><TABLE BORDER>"
// month and year display at top of calendar
content += "<TR><TH COLSPAN=7>" + theMonths[theMonth] + " " + theYear + "</TH></TR>"
// days of the week at head of each column
content += "<TR><TH>Sun</TH><TH>Mon</TH><TH>Tue</TH><TH>Wed</TH>"
content += "<TH>Thu</TH><TH>Fri</TH><TH>Sat</TH></TR>"
content += "<TR>"

// populate calendar
for (var i = 1; i < howMany; i++) {
    if (i < firstDay) {
        // 'empty' boxes prior to first day
        content += "<TD></TD>"
    } else {
        // enter date number
        content += "<TD ALIGN='center'>" + (i - firstDay + 1) + "</TD>"
    }
    // start new row after each week
    if (i % 7 == 0 &&  i != howMany) {
        content += "</TR><TR>"
    }
}
content += "</TABLE></CENTER>"

// blast entire table's HTML to the document
document.write(content)
// end -->
</SCRIPT>
</BODY>
</HTML>