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@adrianengine
Created May 15, 2013 14:40
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A Calendar Widget in JS as seen at http://jszen.blogspot.com/search?q=calendar
// these are labels for the days of the week
cal_days_labels = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
// these are human-readable month name labels, in order
cal_months_labels = ['January', 'February', 'March', 'April',
'May', 'June', 'July', 'August', 'September',
'October', 'November', 'December'];
// these are the days of the week for each month, in order
cal_days_in_month = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
// this is the current date
cal_current_date = new Date();
function Calendar(month, year) {
this.month = (isNaN(month) || month == null) ? cal_current_date.getMonth() : month;
this.year = (isNaN(year) || year == null) ? cal_current_date.getFullYear() : year;
this.html = '';
}
Calendar.prototype.generateHTML = function(){
// get first day of month
var firstDay = new Date(this.year, this.month, 1);
var startingDay = firstDay.getDay();
// find number of days in month
var monthLength = cal_days_in_month[this.month];
// compensate for leap year
if (this.month == 1) { // February only!
if((this.year % 4 == 0 && this.year % 100 != 0) || this.year % 400 == 0){
monthLength = 29;
}
}
// do the header
var monthName = cal_months_labels[this.month]
var html = '<table class="calendar-table">';
html += '<tr><th colspan="7">';
html += monthName + "&nbsp;" + this.year;
html += '</th></tr>';
html += '<tr class="calendar-header">';
for(var i = 0; i <= 6; i++ ){
html += '<td class="calendar-header-day">';
html += cal_days_labels[i];
html += '</td>';
}
html += '</tr><tr>';
// fill in the days
var day = 1;
// this loop is for is weeks (rows)
for (var i = 0; i < 9; i++) {
// this loop is for weekdays (cells)
for (var j = 0; j <= 6; j++) {
html += '<td class="calendar-day">';
if (day <= monthLength && (i > 0 || j >= startingDay)) {
html += day;
day++;
}
html += '</td>';
}
// stop making rows if we've run out of days
if (day > monthLength) {
break;
} else {
html += '</tr><tr>';
}
}
html += '</tr></table>';
this.html = html;
}
Calendar.prototype.getHTML = function() {
return this.html;
}
var cal = new Calendar();
cal.generateHTML();
document.write(cal.getHTML());
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