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/*global gettext, get_format, quickElement, removeChildren*/
/*
calendar.js - Calendar functions by Adrian Holovaty
depends on core.js for utility functions like removeChildren or quickElement
*/
(function() {
'use strict';
// CalendarNamespace -- Provides a collection of HTML calendar-related helper functions
var CalendarNamespace = {
monthsOfYear: gettext('January February March April May June July August September October November December').split(' '),
daysOfWeek: gettext('S M T W T F S').split(' '),
firstDayOfWeek: parseInt(get_format('FIRST_DAY_OF_WEEK')),
isLeapYear: function(year) {
return (((year % 4) === 0) && ((year % 100) !== 0 ) || ((year % 400) === 0));
},
getDaysInMonth: function(month, year) {
var days;
if (month === 1 || month === 3 || month === 5 || month === 7 || month === 8 || month === 10 || month === 12) {
days = 31;
}
else if (month === 4 || month === 6 || month === 9 || month === 11) {
days = 30;
}
else if (month === 2 && CalendarNamespace.isLeapYear(year)) {
days = 29;
}
else {
days = 28;
}
return days;
},
draw: function(month, year, div_id, callback, selected) { // month = 1-12, year = 1-9999
var today = new Date();
var todayDay = today.getDate();
var todayMonth = today.getMonth() + 1;
var todayYear = today.getFullYear();
var todayClass = '';
// Use UTC functions here because the date field does not contain time
// and using the UTC function variants prevent the local time offset
// from altering the date, specifically the day field. For example:
//
// ```
// var x = new Date('2013-10-02');
// var day = x.getDate();
// ```
//
// The day variable above will be 1 instead of 2 in, say, US Pacific time
// zone.
var isSelectedMonth = false;
if (typeof selected !== 'undefined') {
isSelectedMonth = (selected.getUTCFullYear() === year && (selected.getUTCMonth() + 1) === month);
}
month = parseInt(month);
year = parseInt(year);
var calDiv = document.getElementById(div_id);
removeChildren(calDiv);
var calTable = document.createElement('table');
quickElement('caption', calTable, CalendarNamespace.monthsOfYear[month - 1] + ' ' + year);
var tableBody = quickElement('tbody', calTable);
// Draw days-of-week header
var tableRow = quickElement('tr', tableBody);
for (var i = 0; i < 7; i++) {
quickElement('th', tableRow, CalendarNamespace.daysOfWeek[(i + CalendarNamespace.firstDayOfWeek) % 7]);
}
var startingPos = new Date(year, month - 1, 1 - CalendarNamespace.firstDayOfWeek).getDay();
var days = CalendarNamespace.getDaysInMonth(month, year);
var nonDayCell;
// Draw blanks before first of month
tableRow = quickElement('tr', tableBody);
for (i = 0; i < startingPos; i++) {
nonDayCell = quickElement('td', tableRow, ' ');
nonDayCell.className = "nonday";
}
// Draw days of month
var currentDay = 1;
for (i = startingPos; currentDay <= days; i++) {
if (i % 7 === 0 && currentDay !== 1) {
tableRow = quickElement('tr', tableBody);
}
if ((currentDay === todayDay) && (month === todayMonth) && (year === todayYear)) {
todayClass = 'today';
} else {
todayClass = '';
}
// use UTC function; see above for explanation.
if (isSelectedMonth && currentDay === selected.getUTCDate()) {
if (todayClass !== '') {
todayClass += " ";
}
todayClass += "selected";
}
var cell = quickElement('td', tableRow, '', 'class', todayClass);
quickElement('a', cell, currentDay, 'href', 'javascript:void(' + callback + '(' + year + ',' + month + ',' + currentDay + '));');
currentDay++;
}
// Draw blanks after end of month (optional, but makes for valid code)
while (tableRow.childNodes.length < 7) {
nonDayCell = quickElement('td', tableRow, ' ');
nonDayCell.className = "nonday";
}
calDiv.appendChild(calTable);
}
};
// Calendar -- A calendar instance
function Calendar(div_id, callback, selected) {
// div_id (string) is the ID of the element in which the calendar will
// be displayed
// callback (string) is the name of a JavaScript function that will be
// called with the parameters (year, month, day) when a day in the
// calendar is clicked
this.div_id = div_id;
this.callback = callback;
this.today = new Date();
this.currentMonth = this.today.getMonth() + 1;
this.currentYear = this.today.getFullYear();
if (typeof selected !== 'undefined') {
this.selected = selected;
}
}
Calendar.prototype = {
drawCurrent: function() {
CalendarNamespace.draw(this.currentMonth, this.currentYear, this.div_id, this.callback, this.selected);
},
drawDate: function(month, year, selected) {
this.currentMonth = month;
this.currentYear = year;
if(selected) {
this.selected = selected;
}
this.drawCurrent();
},
drawPreviousMonth: function() {
if (this.currentMonth === 1) {
this.currentMonth = 12;
this.currentYear--;
}
else {
this.currentMonth--;
}
this.drawCurrent();
},
drawNextMonth: function() {
if (this.currentMonth === 12) {
this.currentMonth = 1;
this.currentYear++;
}
else {
this.currentMonth++;
}
this.drawCurrent();
},
drawPreviousYear: function() {
this.currentYear--;
this.drawCurrent();
},
drawNextYear: function() {
this.currentYear++;
this.drawCurrent();
}
};
window.Calendar = Calendar;
})();
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