bgneal@1: /*
bgneal@1: calendar.js - Calendar functions by Adrian Holovaty
bgneal@1: */
bgneal@1: 
bgneal@1: function removeChildren(a) { // "a" is reference to an object
bgneal@1:     while (a.hasChildNodes()) a.removeChild(a.lastChild);
bgneal@1: }
bgneal@1: 
bgneal@1: // quickElement(tagType, parentReference, textInChildNode, [, attribute, attributeValue ...]);
bgneal@1: function quickElement() {
bgneal@1:     var obj = document.createElement(arguments[0]);
bgneal@1:     if (arguments[2] != '' && arguments[2] != null) {
bgneal@1:         var textNode = document.createTextNode(arguments[2]);
bgneal@1:         obj.appendChild(textNode);
bgneal@1:     }
bgneal@1:     var len = arguments.length;
bgneal@1:     for (var i = 3; i < len; i += 2) {
bgneal@1:         obj.setAttribute(arguments[i], arguments[i+1]);
bgneal@1:     }
bgneal@1:     arguments[1].appendChild(obj);
bgneal@1:     return obj;
bgneal@1: }
bgneal@1: 
bgneal@1: // CalendarNamespace -- Provides a collection of HTML calendar-related helper functions
bgneal@1: var CalendarNamespace = {
bgneal@1:     monthsOfYear: gettext('January February March April May June July August September October November December').split(' '),
bgneal@1:     daysOfWeek: gettext('S M T W T F S').split(' '),
bgneal@1:     isLeapYear: function(year) {
bgneal@1:         return (((year % 4)==0) && ((year % 100)!=0) || ((year % 400)==0));
bgneal@1:     },
bgneal@1:     getDaysInMonth: function(month,year) {
bgneal@1:         var days;
bgneal@1:         if (month==1 || month==3 || month==5 || month==7 || month==8 || month==10 || month==12) {
bgneal@1:             days = 31;
bgneal@1:         }
bgneal@1:         else if (month==4 || month==6 || month==9 || month==11) {
bgneal@1:             days = 30;
bgneal@1:         }
bgneal@1:         else if (month==2 && CalendarNamespace.isLeapYear(year)) {
bgneal@1:             days = 29;
bgneal@1:         }
bgneal@1:         else {
bgneal@1:             days = 28;
bgneal@1:         }
bgneal@1:         return days;
bgneal@1:     },
bgneal@1:     draw: function(month, year, div_id, callback) { // month = 1-12, year = 1-9999
bgneal@1:         month = parseInt(month);
bgneal@1:         year = parseInt(year);
bgneal@1:         var calDiv = document.getElementById(div_id);
bgneal@1:         removeChildren(calDiv);
bgneal@1:         var calTable = document.createElement('table');
bgneal@1:         quickElement('caption', calTable, CalendarNamespace.monthsOfYear[month-1] + ' ' + year);
bgneal@1:         var tableBody = quickElement('tbody', calTable);
bgneal@1: 
bgneal@1:         // Draw days-of-week header
bgneal@1:         var tableRow = quickElement('tr', tableBody);
bgneal@1:         for (var i = 0; i < 7; i++) {
bgneal@1:             quickElement('th', tableRow, CalendarNamespace.daysOfWeek[i]);
bgneal@1:         }
bgneal@1: 
bgneal@1:         var startingPos = new Date(year, month-1, 1).getDay();
bgneal@1:         var days = CalendarNamespace.getDaysInMonth(month, year);
bgneal@1: 
bgneal@1:         // Draw blanks before first of month
bgneal@1:         tableRow = quickElement('tr', tableBody);
bgneal@1:         for (var i = 0; i < startingPos; i++) {
bgneal@1:             var _cell = quickElement('td', tableRow, ' ');
bgneal@1:             _cell.style.backgroundColor = '#f3f3f3';
bgneal@1:         }
bgneal@1: 
bgneal@1:         // Draw days of month
bgneal@1:         var currentDay = 1;
bgneal@1:         for (var i = startingPos; currentDay <= days; i++) {
bgneal@1:             if (i%7 == 0 && currentDay != 1) {
bgneal@1:                 tableRow = quickElement('tr', tableBody);
bgneal@1:             }
bgneal@1:             var cell = quickElement('td', tableRow, '');
bgneal@1:             quickElement('a', cell, currentDay, 'href', 'javascript:void(' + callback + '('+year+','+month+','+currentDay+'));');
bgneal@1:             currentDay++;
bgneal@1:         }
bgneal@1: 
bgneal@1:         // Draw blanks after end of month (optional, but makes for valid code)
bgneal@1:         while (tableRow.childNodes.length < 7) {
bgneal@1:             var _cell = quickElement('td', tableRow, ' ');
bgneal@1:             _cell.style.backgroundColor = '#f3f3f3';
bgneal@1:         }
bgneal@1: 
bgneal@1:         calDiv.appendChild(calTable);
bgneal@1:     }
bgneal@1: }
bgneal@1: 
bgneal@1: // Calendar -- A calendar instance
bgneal@1: function Calendar(div_id, callback) {
bgneal@1:     // div_id (string) is the ID of the element in which the calendar will
bgneal@1:     //     be displayed
bgneal@1:     // callback (string) is the name of a JavaScript function that will be
bgneal@1:     //     called with the parameters (year, month, day) when a day in the
bgneal@1:     //     calendar is clicked
bgneal@1:     this.div_id = div_id;
bgneal@1:     this.callback = callback;
bgneal@1:     this.today = new Date();
bgneal@1:     this.currentMonth = this.today.getMonth() + 1;
bgneal@1:     this.currentYear = this.today.getFullYear();
bgneal@1: }
bgneal@1: Calendar.prototype = {
bgneal@1:     drawCurrent: function() {
bgneal@1:         CalendarNamespace.draw(this.currentMonth, this.currentYear, this.div_id, this.callback);
bgneal@1:     },
bgneal@1:     drawDate: function(month, year) {
bgneal@1:         this.currentMonth = month;
bgneal@1:         this.currentYear = year;
bgneal@1:         this.drawCurrent();
bgneal@1:     },
bgneal@1:     drawPreviousMonth: function() {
bgneal@1:         if (this.currentMonth == 1) {
bgneal@1:             this.currentMonth = 12;
bgneal@1:             this.currentYear--;
bgneal@1:         }
bgneal@1:         else {
bgneal@1:             this.currentMonth--;
bgneal@1:         }
bgneal@1:         this.drawCurrent();
bgneal@1:     },
bgneal@1:     drawNextMonth: function() {
bgneal@1:         if (this.currentMonth == 12) {
bgneal@1:             this.currentMonth = 1;
bgneal@1:             this.currentYear++;
bgneal@1:         }
bgneal@1:         else {
bgneal@1:             this.currentMonth++;
bgneal@1:         }
bgneal@1:         this.drawCurrent();
bgneal@1:     },
bgneal@1:     drawPreviousYear: function() {
bgneal@1:         this.currentYear--;
bgneal@1:         this.drawCurrent();
bgneal@1:     },
bgneal@1:     drawNextYear: function() {
bgneal@1:         this.currentYear++;
bgneal@1:         this.drawCurrent();
bgneal@1:     }
bgneal@1: }