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DatePicker.js
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var DatePicker = (function() {
// DatePicker v 1.2.0
return {
DayNames: ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa'],
MonthNames: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
LongMonthNames: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
DateFormat: "ymd",
DateFormatter: "-",
FirstDay: 1, // 0 for Sunday, 1 for Monday
CalendarContainerId: "datepicker",
CalendarYearSelectorYearId: "datepickeryear1",
CalendarYearSelectorMonthId: "datepickermonth1",
CalendarYearSelectorButtonId: "datepickerbutton1",
CalendarLayoutFormat: '<table summary="Date Picker"><caption>{0}</caption><thead>{1}</thead><tbody>{2}</tbody></table>{3}<div style="clear: both;"></div>',
CalendarCaptionFormat: '<div>{0}{2}{1}</div>',
CalendarHeaderFormat: "<tr><th>{0}</th><th>{1}</th><th>{2}</th><th>{3}</th><th>{4}</th><th>{5}</th><th>{6}</th></tr>",
CalendarRowFormat: "<tr><td>{0}</td><td>{1}</td><td>{2}</td><td>{3}</td><td>{4}</td><td>{5}</td><td>{6}</td></tr>",
CalendarFooterFormat: '<div class="footer"><div>{0}</div><div>{1}</div></div>',
CalendarLinkFormat: '<a href="#{0}" onclick="{1}" class="{2}">{3}</a>',
SetUpElement: function (inputField) {
var dateField = document.getElementById(inputField);
if (dateField) {
var fieldParent = dateField.parentNode;
var button = document.createElement("input");
button.type = "button";
button.onclick = function () { DatePicker.GetCalendar(inputField, this); }
button.value = "Select";
fieldParent.appendChild(button);
}
},
GetCalendar : function (inputField, activator) {
// Shows a calendar based on a given input field
// Obtains the selected date from the field to display the correct date
// Return the formatted date to the field when selection is made
if (!document.getElementById(this.CalendarContainerId)) {
var containerElement = document.createElement("div");
containerElement.id = this.CalendarContainerId;
containerElement.style.display = "none";
document.body.appendChild(containerElement);
}
var container = document.getElementById(this.CalendarContainerId);
if (container.style.display == "none") {
var dateField = document.getElementById(inputField);
var dateString = dateField.value;
var inputDate = this.GetDateFromString(dateString);
var calendar = this.GetCalendarForDate(inputDate, inputField);
container.innerHTML = calendar;
this.SetContainerPosition(container, activator);
container.style.display = "block";
} else {
this.Close();
}
},
Close: function() {
var container = document.getElementById(this.CalendarContainerId);
container.style.display = "none";
},
ChangeMonth: function(inputField, dateString) {
// Updates the calendar to show a different month
var container = document.getElementById(this.CalendarContainerId);
var inputDate = this.GetDateFromString(dateString);
var calendar = this.GetCalendarForDate(inputDate, inputField);
container.innerHTML = calendar;
},
ChangeYearSelector: function(activator, inputField, month) {
if (activator.rel == "selecting") {
} else {
activator.style.top = "0";
activator.rel = "selecting";
var currentYear = activator.innerHTML;
currentYear = currentYear.substring(currentYear.length - 4);
var yearSelector = '<input type="text" id="' + this.CalendarYearSelectorYearId + '" name="' + this.CalendarYearSelectorYearId + '" size="4" value="' + currentYear + '" onkeyup="if (this.value.length === 4) { document.getElementById(\'' + this.CalendarYearSelectorButtonId + '\').focus(); };">' +
'<input type="hidden" value="' + month + '" name="' + this.CalendarYearSelectorMonthId + '" id="' + this.CalendarYearSelectorMonthId + '">' +
'<input type="button" onclick="DatePicker.ChangeYear(\'' + inputField + '\');" value="Go" id="' + this.CalendarYearSelectorButtonId + '">';
activator.innerHTML = yearSelector;
}
},
ChangeYear: function (inputField) {
var inputYear = document.getElementById(this.CalendarYearSelectorYearId).value;
var inputMonth = document.getElementById(this.CalendarYearSelectorMonthId).value;
var newDate = new Date(inputYear, inputMonth, 1, 0, 0, 0);
this.ChangeMonth(inputField, this.GetStringFromDate(newDate));
},
GetDateFromString: function (dateString) {
// Converts a string into a date based on
// - this.DateFormat
// - this.DateFormatter
var inputParts = dateString.split(this.DateFormatter);
var inputDate = new Date();
if (inputParts.length == 3) {
inputDate.setDate(1);
var dayPosition = this.DateFormat.indexOf("d");
var monthPosition = this.DateFormat.indexOf("m");
var yearPosition = this.DateFormat.indexOf("y");
var today = new Date();
if (isNaN(inputParts[yearPosition])) {
inputParts[yearPosition] = today.getFullYear();
}
if (isNaN(inputParts[monthPosition])) {
inputParts[monthPosition] = today.getMonth();
}
if (isNaN(inputParts[dayPosition])) {
inputParts[dayPosition] = today.getDate();
}
inputDate.setYear(inputParts[yearPosition]);
inputDate.setMonth((inputParts[monthPosition] - 1));
inputDate.setDate(inputParts[dayPosition]);
}
return inputDate;
},
GetStringFromDate: function (date) {
// Converts a date into a string based on
// - this.DateFormat
// - this.DateFormatter
var i;
var dateParts = new Array();
var dateString = "";
var dayPosition = this.DateFormat.indexOf("d");
var monthPosition = this.DateFormat.indexOf("m");
var yearPosition = this.DateFormat.indexOf("y");
dateParts[dayPosition] = date.getDate();
dateParts[monthPosition] = (date.getMonth() + 1);
dateParts[yearPosition] = date.getFullYear();
for (i = 0; i < dateParts.length; i++) {
var datePart = dateParts[i].toString();
if (datePart.length < 2) {
datePart = '0' + datePart;
}
if (i > 0) {
dateString += this.DateFormatter;
}
dateString += datePart;
}
return dateString;
},
GetCalendarForDate: function (date, inputField) {
// Gets an HTML calendar for the given month
// - this.CalendarLayoutFormat
var calendar = this.CalendarLayoutFormat;
calendar = calendar.replace("{0}", this.GetCaption(date, inputField));
calendar = calendar.replace("{1}", this.GetDayHeadings());
calendar = calendar.replace("{2}", this.GetDays(date, inputField));
calendar = calendar.replace("{3}", this.GetFooter(inputField));
return calendar;
},
GetCaption: function(date, inputField) {
// Gets the caption based on a given date
var previous = new Date(date.getFullYear(), date.getMonth(), 1, 0, 0, 0);
previous.setMonth(previous.getMonth() -1);
var previousDateString = this.GetStringFromDate(previous);
var next = new Date(date.getFullYear(), date.getMonth(), 1, 0, 0, 0);
next.setMonth(next.getMonth() +1);
var nextDateString = this.GetStringFromDate(next);
var caption = this.CalendarCaptionFormat;
caption = caption.replace("{0}", '<a href="#' + previousDateString + '" onclick="DatePicker.ChangeMonth(\'' + inputField + '\', \'' + previousDateString + '\')" class="previous">«</a>');
caption = caption.replace("{1}", '<span id="captionheader" onclick="DatePicker.ChangeYearSelector(this, \'' + inputField + '\', \'' + date.getMonth() + '\');">' + this.MonthNames[date.getMonth()] + " " + date.getFullYear() + "</span>");
caption = caption.replace("{2}", '<a href="#' + nextDateString + '" onclick="DatePicker.ChangeMonth(\'' + inputField + '\', \'' + nextDateString + '\')" class="next">»</a>');
return caption;
},
GetDayHeadings: function () {
// Gets day of the week headings for a calendar
var i = 0;
var j = this.FirstDay;
var dayHeadings = this.CalendarHeaderFormat;
for (i = 0; i < 7; i++) {
dayHeadings = dayHeadings.replace("{" + i + "}", this.DayNames[j]);
j++;
if (j > 6) {
j = 0;
}
}
return dayHeadings;
},
GetDays: function (date, inputField) {
// Gets links to select the individual dates in the month
var i;
var dayDate = date;
var dayOfMonth;
dayDate.setDate(1);
var firstDayOfWeekInMonth = dayDate.getDay();
var rows = [];
var columnCount = rows.length;
rows[columnCount] = this.CalendarRowFormat;
dayOfMonth = dayDate.getDate();
// First Row
if (this.FirstDay == 1 && firstDayOfWeekInMonth == 0) {
for (i = 0; i < 6; i++) {
rows[columnCount] = rows[columnCount].replace("{" + i + "}", " ");
}
rows[columnCount] = rows[columnCount].replace("{6}", this.GetDateLink(dayDate, inputField));
dayDate.setDate(dayOfMonth + 1);
} else {
for (i = 0; i < 7; i++) {
if (i + this.FirstDay >= firstDayOfWeekInMonth) {
dayOfMonth = dayDate.getDate();
rows[columnCount] = rows[columnCount].replace("{" + i + "}", this.GetDateLink(dayDate, inputField));
dayDate.setDate(dayOfMonth + 1);
} else {
rows[columnCount] = rows[columnCount].replace("{" + i + "}", " ");
}
}
}
// Subsequent rows
dayOfMonth = 2;
while (dayOfMonth > 1) {
var columnCount = rows.length;
rows[columnCount] = this.CalendarRowFormat;
for (i = 0; i < 7; i++) {
dayOfMonth = dayDate.getDate();
if (dayOfMonth != 1) {
rows[columnCount] = rows[columnCount].replace("{" + i + "}", this.GetDateLink(dayDate, inputField));
dayDate.setDate(dayOfMonth + 1);
dayOfMonth = dayDate.getDate();
} else {
rows[columnCount] = rows[columnCount].replace("{" + i + "}", " ");
}
}
}
var calendarBody = "";
for (i = 0; i < rows.length; i++) {
calendarBody += rows[i];
}
return calendarBody;
},
GetDateLink: function(date, inputField) {
// Gets a link to select a date
var dateLink = this.CalendarLinkFormat;
var dateString = this.GetStringFromDate(date);
var dayOfWeek = date.getDay();
dateLink = dateLink.replace("{0}", dateString);
dateLink = dateLink.replace("{1}", "DatePicker.SelectDate('" + inputField + "', '" + dateString + "');");
dateLink = dateLink.replace("{2}", "day" + dayOfWeek);
dateLink = dateLink.replace("{3}", date.getDate());
return dateLink;
},
GetFooter: function(inputField) {
var footer = this.CalendarFooterFormat;
var currentDate = new Date();
var currentDateString = this.GetStringFromDate(currentDate);
var currentDateText = this.MonthNames[currentDate.getMonth()] + " " + currentDate.getFullYear();
footer = footer.replace("{0}", '<a href="#" onclick="DatePicker.ChangeMonth(\'' + inputField + '\', \'' + currentDateString + '\');">' + currentDateText + '</a>');
footer = footer.replace("{1}", '<a href="#" onclick="DatePicker.Close();">Close</a>');
return footer;
},
SetContainerPosition: function (container, activator) {
// Positions the container
var activatorPosition = this.GetActivatorPosition(activator);
container.style.position = "absolute";
container.style.top = activatorPosition.top + "px";
container.style.left = activatorPosition.left + "px";
},
GetActivatorPosition: function (activator) {
// Gets the position of the item that was clicked
var leftPosition = 0;
var topPosition = 0;
var height = activator.offsetHeight;
if (activator.offsetParent) {
do {
leftPosition += activator.offsetLeft;
topPosition += activator.offsetTop;
} while (activator = activator.offsetParent);
}
return { left: leftPosition, top: topPosition + height };
},
SelectDate: function(inputField, dateString) {
// Handles date selection
document.getElementById(inputField).value = dateString;
this.Close();
return false;
}
};
}());