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"use strict";
/* datepicker component definition */
(function(window, $) {
var $document = $(window);
var $body = $('body');
var $html = $('html');
var NS_DATEPICKER = 'jquery-datepicker';
var Datepicker = function(element, options) {
var properties;
var $element = $(element);
options = $.isPlainObject(options) ? options : {};
properties = {
options : $.extend({}, Datepicker.prototype.DEFAULTS, options),
isMobile: $html.hasClass('mobile'),
$elem : $element,
$input: $element.find('.jquery-datepicker__input'),
$panel: null,
selectedDate: null, /* store the selected date */
displayMonth: null, /* store the currently displayed month */
isCreated: false,
isShown: false,
isDateSelected: (options.date !== 'none') /* indicator for date selection */
};
$.extend(this, properties);
this.init();
};
Datepicker.prototype = {
constructor: Datepicker,
DEFAULTS: {
lang: 'en',
date: null, /* date strings should be in YYYY-M-D format like '2017-1-3', or format like '+3d' */
startDate: null,
endDate: null,
disabledDates: [],
format: 'ddmmyy',
position: 'below' /* above or below the input field */
},
msg: {
en: {
months : ['January', 'February', 'March', 'April', 'May', 'June',
'July', 'August', 'September', 'October', 'November', 'December'],
days: ['MO', 'TU', 'WE', 'TH', 'FR', 'SA', 'SU']
}
},
init: function() {
/* initialise internal date objects */
this.initDateObj();
/* initialise attached input field,
* set to readonly to disable keyboard in mobile devices */
this.$input.attr('readonly', 'readonly');
if (this.isDateSelected) {
this.updateInputfield(this.formatDateStr(this.selectedDate));
}
/* create container for mobile browsers */
if (this.isMobile === true) {
this.$container = $('<div>').addClass('jquery-datepicker__container').appendTo($body);
}
/* create datepicker view */
this.updateView(this.selectedDate);
if (this.isMobile === true) {
this.$container.addClass('-is--hidden');
} else {
this.$panel.addClass('-is--hidden');
}
/* click on the input field will trigger datepicker*/
this.attachToInput();
this.isCreated = true;
},
initDateObj: function() {
this.selectedDate = this.getDateObj(this.options.date);
if (this.options.startDate) {
this.startDate = this.getDateObj(this.options.startDate);
}
if (this.options.endDate) {
this.endDate = this.getDateObj(this.options.endDate);
}
},
updateView: function(dateObj) {
var $header, $content, $table;
$header = this.getHeader(this.msg[this.options.lang], dateObj);
$content = this.getContent(this.msg[this.options.lang], dateObj);
$table = $('<table>').addClass('jquery-datepicker__table').append($header, $content);
/* create the panel */
if (this.isCreated) {
/* clean up before insert new child elements */
this.$panel.empty().append($table);
} else {
this.$panel = $('<div>').addClass('jquery-datepicker__panel').append($table);
}
/* add special class in mobile devices */
if (this.isMobile) {
this.$panel.addClass('-device--mobile').appendTo(this.$container);
} else {
this.$panel.appendTo($body);
}
this.adjustPanelPosition();
this.displayMonth = new Date(dateObj.getTime());
/* update event handlers */
this.registerEventHandlers();
},
getHeader: function(msg, dateObj) {
var year, month;
var $previous, $next, $title, $header;
year = dateObj.getFullYear();
month = dateObj.getMonth();
$previous = $('<th>').addClass('jquery-datepicker__prev')
.append($('<span>').addClass('fa fa-chevron-left'));
$next = $('<th>').addClass('jquery-datepicker__next')
.append($('<span>').addClass('fa fa-chevron-right'));
$title = $('<th>').attr('colspan', '5').addClass('jquery-datepicker__title')
.append($('<span>').text(msg.months[month] + ' ' + year));
$header = $('<thead>');
$('<tr>').append($previous, $title, $next).appendTo($header);
return $header;
},
getContent: function(msg, dateObj) {
var year, month;
var $content;
var firstDay, i;
var dayItems = [], dayItem;
year = dateObj.getFullYear();
month = dateObj.getMonth();
/* create day names row */
$content = $('<tr>');
msg.days.forEach(function(name) {
$content.append($('<td>').addClass('jquery-datepicker__dayName').append($('<span>').text(name)));
});
/* create elements for days of current month */
if ((firstDay = new Date(year, month, 1).getDay()) === 0) {
firstDay = 7;
}
for (i = 0; i < firstDay - 1; i++) {
/* place empty cells before the first day */
dayItems.push($('<td>').addClass('-is--disabled').append('<span>'));
}
for (i = 1; i <= this.getDaysOfMonth(month + 1, year); i++) {
dayItem = $('<td>').addClass('jquery-datepicker__day').append($('<span>').text(i));
/* add classes to selected date and disabled dates */
if (this.isDateSelected &&
this.selectedDate.getFullYear() === year &&
this.selectedDate.getMonth() === month &&
this.selectedDate.getDate() === i) {
dayItem.addClass('-is--selected');
}
if (this.startDate && (this.startDate.getTime() > new Date(year, month, i).getTime())) {
dayItem.addClass('-is--disabled');
}
if (this.endDate && (this.endDate.getTime() < new Date(year, month, i).getTime())) {
dayItem.addClass('-is--disabled');
}
dayItems.push(dayItem);
}
/* put day cells in order */
for (i = 0; i < dayItems.length; i = i + 7) {
$content = $content.add($('<tr>').append(dayItems.slice(i, i + 7)));
}
return $content;
},
getDaysOfMonth: function (month, year) {
return (new Date(year, month, 0).getDate());
},
getDateObj: function(dateStr) {
var dateObj, dateArray, now, op, num;
if (!this.isDateSelected || !dateStr || typeof dateStr !== 'string') {
/* use today if no date is specified */
now = new Date();
dateObj = new Date(now.getFullYear(), now.getMonth(), now.getDate());
} else {
op = dateStr.charAt(0);
if (op === '+' || op === '-') {
/* format #1: -3d, +1d, etc */
num = parseInt(dateStr.slice(1, -1), 10);
now = new Date();
dateObj = new Date(now.getFullYear(), now.getMonth(), now.getDate());
if (isNaN(num)) {
num = 0;
}
switch (op) {
case '-':
dateObj.setDate(dateObj.getDate() - num);
break;
case '+':
default:
dateObj.setDate(dateObj.getDate() + num);
break;
}
} else {
/* format #2: YYYY-M-D */
dateArray = dateStr.split('-');
dateObj = new Date(dateArray[0], parseInt(dateArray[1], 10) - 1, dateArray[2]);}
}
return dateObj;
},
formatDateStr: function(dateObj) {
var year, fullYear, month, day, dateStr;
year = (dateObj.getFullYear() + '').slice(-2);
fullYear = dateObj.getFullYear() + '';
month = ('0' + (dateObj.getMonth() + 1)).slice(-2);
day = ('0' + dateObj.getDate()).slice(-2);
switch (this.options.format) {
case 'yyyymmdd':
dateStr = fullYear + '/' + month + '/' + day;
break;
case 'mmddyyyy':
dateStr = month + '/' + day + '/' + fullYear;
break;
case 'ddmmyyyy':
dateStr = day + '/' + month + '/' + fullYear;
break;
case 'yymmdd':
dateStr = year + '/' + month + '/' + day;
break;
case 'mmddyy':
dateStr = month + '/' + day + '/' + year;
break;
case 'ddmmyy':
default:
dateStr = day + '/' + month + '/' + year;
break;
}
return dateStr;
},
registerEventHandlers: function() {
var that = this;
var $prevBtn = this.$panel.find('.jquery-datepicker__prev');
var $nextBtn = this.$panel.find('.jquery-datepicker__next');
var $dayItems = this.$panel.find('table td');
$prevBtn.on('click', function(ev) {
ev.stopPropagation();
that.displayMonth = new Date(that.displayMonth.getFullYear(), that.displayMonth.getMonth() - 1, 1);
that.updateView(that.displayMonth);
});
$nextBtn.on('click', function(ev) {
ev.stopPropagation();
that.displayMonth = new Date(that.displayMonth.getFullYear(), that.displayMonth.getMonth() + 1, 1);
that.updateView(that.displayMonth);
});
$dayItems.on('click', function(ev) {
var $this = $(this);
ev.stopPropagation();
/* ignore disabled dates */
if ($this.hasClass('-is--disabled') || $this.hasClass('jquery-datepicker__dayName')) {
return false;
}
/* update classes */
that.$panel.find('.-is--selected').removeClass('-is--selected');
$this.addClass('-is--selected');
/* update selectedDate object and associated input field value */
that.selectedDate = that.getDateObj('' + that.displayMonth.getFullYear() + '-' +
(that.displayMonth.getMonth() + 1) + '-' +
$this.find('span').text());
/* update input field value, and trigger change event */
that.updateInputfield(that.formatDateStr(that.selectedDate));
that.isDateSelected = true;
that.hide();
});
},
attachToInput: function() {
var that = this;
this.$input.on('click', function() {
that.$input.blur(); /* prevent ios browsers to show the input caret */
if (that.isShown === false){
that.show();
}
});
},
updateInputfield: function(str) {
this.$input.val(str).trigger('change');
},
adjustPanelPosition: function() {
var offset = this.$input.offset();
if (this.isMobile === true) {
/* for mobile browsers */
this.$panel.width(this.$panel.find('table').width());
} else {
/* for desktop browsers */
if (this.options.position === 'below') {
this.$panel.addClass('-position--below').removeClass('-position--above');
this.$panel.css({top: (offset.top + this.$input.outerHeight()), left: offset.left});
} else {
this.$panel.addClass('-position--above').removeClass('-position--below');
this.$panel.css({bottom: ($document.height() - offset.top), left: offset.left});
}
}
this.$panel.height(this.$panel.find('table').height());
},
show: function() {
var that = this;
/* clicking on other area of window will cause datepicker to hide */
$document.click(function (ev) {
if (!that.$input.is(ev.target) &&
!that.$panel.is(ev.target) && that.$panel.has(ev.target).length === 0) {
that.hide();
}
});
/* add transition effect */
if (this.isMobile) {
this.$container.fadeIn(250, function() {
$body.css('cursor', 'pointer'); /* ios hack */
that.$container.removeClass('-is--hidden');
});
} else {
this.$panel.fadeIn(250, function() {
that.$panel.removeClass('-is--hidden');
});
}
/* re-calculate panel position */
this.adjustPanelPosition();
this.isShown = true;
},
hide: function() {
var that = this;
/* add transition effect */
if (this.isMobile) {
this.$container.fadeOut(250, function() {
$body.css('cursor', ''); /* ios hack */
that.$container.addClass('-is--hidden');
});
} else {
this.$panel.fadeOut(250, function() {
that.$panel.addClass('-is--hidden');
});
}
this.isShown = false;
},
/* APIs to set/get date object */
get: function() {
if (this.isDateSelected) {
return this.selectedDate;
} else {
/* return null if no date is selected */
return null;
}
},
set: function(obj) {
if (obj === null) {
/* if null is passed, set datepicker to no date selected */
this.isDateSelected = false;
this.selectedDate = this.getDateObj();
this.updateView(this.selectedDate);
this.updateInputfield('');
} else {
/* assuming Date object is passed */
this.isDateSelected = true;
this.selectedDate = obj;
this.updateView(this.selectedDate);
this.updateInputfield(this.formatDateStr(this.selectedDate));
}
}
};
$.fn.datepicker = function(options) {
var args = Array.prototype.slice.call(arguments);
var ret;
this.each(function() {
var $this = $(this);
var data = $this.data(NS_DATEPICKER);
var func;
var dataOpts;
dataOpts = {
date: $this.attr('data-selected-date'),
startDate: $this.attr('data-start-date'),
endDate: $this.attr('data-end-date'),
format: $this.attr('data-format')
};
/* if no datepicker data, create one */
if (!data) {
$this.data(NS_DATEPICKER, (data = new Datepicker(this, $.extend({}, dataOpts, options))));
}
/* invoke function */
if (typeof options === 'string' && typeof (func = data[options]) === 'function') {
ret = func.apply(data, args.slice(1));
}
});
return ret === undefined ? this : ret;
};
$.fn.datepicker.Constructor = Datepicker;
})(window, jQuery);
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