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Filename : daterangepicker.js
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/**
* @version: 1.0.1
* @author: Dan Grossman http://www.dangrossman.info/
* @date: 2012-08-20
* @copyright: Copyright (c) 2012 Dan Grossman. All rights reserved.
* @license: Licensed under Apache License v2.0. See http://www.apache.org/licenses/LICENSE-2.0
* @website: http://www.improvely.com/
*/
!function ($) {

    var DateRangePicker = function (element, options, cb) {
        var hasOptions = typeof options == 'object'
        var localeObject;

        //state
        this.startDate = Date.today();
        this.endDate = Date.today();
        this.minDate = false;
        this.maxDate = false;
        this.changed = false;
        this.ranges = {};
        this.opens = 'right';
        this.cb = function () { };
        this.format = 'MM/dd/yyyy';
        this.separator = ' - ';
        this.showWeekNumbers = false;
        this.buttonClasses = ['btn-primary'];
        this.locale = {
            applyLabel: 'Apply',
            fromLabel: 'From',
            toLabel: 'To',
            weekLabel: 'W',
            customRangeLabel: 'Custom Range',
            daysOfWeek: Date.CultureInfo.shortestDayNames,
            monthNames: Date.CultureInfo.monthNames,
            firstDay: 0
        };

        localeObject = this.locale;

        this.leftCalendar = {
            month: Date.today().set({ day: 1, month: this.startDate.getMonth(), year: this.startDate.getFullYear() }),
            calendar: Array()
        };

        this.rightCalendar = {
            month: Date.today().set({ day: 1, month: this.endDate.getMonth(), year: this.endDate.getFullYear() }),
            calendar: Array()
        };

        // by default, the daterangepicker element is placed at the bottom of HTML body
        this.parentEl = 'body';

        //element that triggered the date range picker
        this.element = $(element);

        if (this.element.hasClass('pull-right'))
            this.opens = 'left';

        if (this.element.is('input')) {
            this.element.on({
                click: $.proxy(this.show, this),
                focus: $.proxy(this.show, this)
            });
        } else {
            this.element.on('click', $.proxy(this.show, this));
        }

        if (hasOptions) {
            if(typeof options.locale == 'object') {
                $.each(localeObject, function (property, value) {
                    localeObject[property] = options.locale[property] || value;
                });
            }
        }

        var DRPTemplate = '<div class="daterangepicker dropdown-menu">' +
                '<div class="calendar left"></div>' +
                '<div class="calendar right"></div>' +
                '<div class="ranges">' +
                  '<div class="range_inputs">' +
                    '<div>' +
                      '<label for="daterangepicker_start">' + this.locale.fromLabel + '</label>' +
                      '<input class="input-mini form-control" type="text" name="daterangepicker_start" value="" disabled="disabled" />' +
                    '</div>' +
                    '<div>' +
                      '<label for="daterangepicker_end">' + this.locale.toLabel + '</label>' +
                      '<input class="input-mini form-control" type="text" name="daterangepicker_end" value="" disabled="disabled" />' +
                    '</div>' +
                    '<button class="btn btn-small" disabled="disabled">' + this.locale.applyLabel + '</button>' +
                  '</div>' +
                '</div>' +
              '</div>';

        this.parentEl = (hasOptions && options.parentEl && $(options.parentEl)) || $(this.parentEl);
        //the date range picker
        this.container = $(DRPTemplate).appendTo(this.parentEl);

        if (hasOptions) {

            if (typeof options.format == 'string')
                this.format = options.format;

            if (typeof options.separator == 'string')
                this.separator = options.separator;

            if (typeof options.startDate == 'string')
                this.startDate = Date.parse(options.startDate, this.format);

            if (typeof options.endDate == 'string')
                this.endDate = Date.parse(options.endDate, this.format);

            if (typeof options.minDate == 'string')
                this.minDate = Date.parse(options.minDate, this.format);

            if (typeof options.maxDate == 'string')
                this.maxDate = Date.parse(options.maxDate, this.format);


            if (typeof options.startDate == 'object')
                this.startDate = options.startDate;

            if (typeof options.endDate == 'object')
                this.endDate = options.endDate;

            if (typeof options.minDate == 'object')
                this.minDate = options.minDate;

            if (typeof options.maxDate == 'object')
                this.maxDate = options.maxDate;

            if (typeof options.ranges == 'object') {
                for (var range in options.ranges) {

                    var start = options.ranges[range][0];
                    var end = options.ranges[range][1];

                    if (typeof start == 'string')
                        start = Date.parse(start);

                    if (typeof end == 'string')
                        end = Date.parse(end);

                    // If we have a min/max date set, bound this range
                    // to it, but only if it would otherwise fall
                    // outside of the min/max.
                    if (this.minDate && start < this.minDate)
                        start = this.minDate;

                    if (this.maxDate && end > this.maxDate)
                        end = this.maxDate;

                    // If the end of the range is before the minimum (if min is set) OR
                    // the start of the range is after the max (also if set) don't display this
                    // range option.
                    if ((this.minDate && end < this.minDate) || (this.maxDate && start > this.maxDate))
                    {
                        continue;
                    }

                    this.ranges[range] = [start, end];
                }

                var list = '<ul>';
                for (var range in this.ranges) {
                    list += '<li>' + range + '</li>';
                }
                list += '<li>' + this.locale.customRangeLabel + '</li>';
                list += '</ul>';
                this.container.find('.ranges').prepend(list);
            }

            // update day names order to firstDay
            if (typeof options.locale == 'object') {
                if (typeof options.locale.firstDay == 'number') {
                    this.locale.firstDay = options.locale.firstDay;
                    var iterator = options.locale.firstDay;
                    while (iterator > 0) {
                        this.locale.daysOfWeek.push(this.locale.daysOfWeek.shift());
                        iterator--;
                    }
                }
            }

            if (typeof options.opens == 'string')
                this.opens = options.opens;

            if (typeof options.showWeekNumbers == 'boolean') {
                this.showWeekNumbers = options.showWeekNumbers;
            }

            if (typeof options.buttonClasses == 'string') {
                this.buttonClasses = [options.buttonClasses];
            }

            if (typeof options.buttonClasses == 'object') {
                this.buttonClasses = options.buttonClasses;
            }

        }

        //apply CSS classes to buttons
        var c = this.container;
        $.each(this.buttonClasses, function (idx, val) {
            c.find('button').addClass(val);
        });

        if (this.opens == 'right') {
            //swap calendar positions
            var left = this.container.find('.calendar.left');
            var right = this.container.find('.calendar.right');
            left.removeClass('left').addClass('right');
            right.removeClass('right').addClass('left');
        }

        if (typeof options == 'undefined' || typeof options.ranges == 'undefined')
            this.container.find('.calendar').show();

        if (typeof cb == 'function')
            this.cb = cb;

        this.container.addClass('opens' + this.opens);

        //event listeners
        this.container.on('mousedown', $.proxy(this.mousedown, this));
        this.container.find('.calendar').on('click', '.prev', $.proxy(this.clickPrev, this));
        this.container.find('.calendar').on('click', '.next', $.proxy(this.clickNext, this));
        this.container.find('.ranges').on('click', 'button', $.proxy(this.clickApply, this));

        this.container.find('.calendar').on('click', 'td.available', $.proxy(this.clickDate, this));
        this.container.find('.calendar').on('mouseenter', 'td.available', $.proxy(this.enterDate, this));
        this.container.find('.calendar').on('mouseleave', 'td.available', $.proxy(this.updateView, this));

        this.container.find('.ranges').on('click', 'li', $.proxy(this.clickRange, this));
        this.container.find('.ranges').on('mouseenter', 'li', $.proxy(this.enterRange, this));
        this.container.find('.ranges').on('mouseleave', 'li', $.proxy(this.updateView, this));

        this.element.on('keyup', $.proxy(this.updateFromControl, this));

        this.updateView();
        this.updateCalendars();

    };

    DateRangePicker.prototype = {

        constructor: DateRangePicker,

        mousedown: function (e) {
            e.stopPropagation();
            e.preventDefault();
        },

        updateView: function () {
            this.leftCalendar.month.set({ month: this.startDate.getMonth(), year: this.startDate.getFullYear() });
            this.rightCalendar.month.set({ month: this.endDate.getMonth(), year: this.endDate.getFullYear() });

            this.container.find('input[name=daterangepicker_start]').val(this.startDate.toString(this.format));
            this.container.find('input[name=daterangepicker_end]').val(this.endDate.toString(this.format));

            if (this.startDate.equals(this.endDate) || this.startDate.isBefore(this.endDate)) {
                this.container.find('button').removeAttr('disabled');
            } else {
                this.container.find('button').attr('disabled', 'disabled');
            }
        },

        updateFromControl: function () {
            if (!this.element.is('input')) return;

            var dateString = this.element.val().split(this.separator);
            var start = Date.parseExact(dateString[0], this.format);
            var end = Date.parseExact(dateString[1], this.format);

            if (start == null || end == null) return;
            if (end.isBefore(start)) return;

            this.startDate = start;
            this.endDate = end;

            this.updateView();
            this.cb(this.startDate, this.endDate);
            this.updateCalendars();
        },

        notify: function () {
            this.updateView();

            if (this.element.is('input')) {
                this.element.val(this.startDate.toString(this.format) + this.separator + this.endDate.toString(this.format));
            }
            this.cb(this.startDate, this.endDate);
        },

        move: function () {
            var parentOffset = {
                top: this.parentEl.offset().top - this.parentEl.scrollTop(),
                left: this.parentEl.offset().left - this.parentEl.scrollLeft()
            };
            if (this.opens == 'left') {
                this.container.css({
                    top: this.element.offset().top + this.element.outerHeight(),
                    right: $(window).width() - this.element.offset().left - this.element.outerWidth() - parentOffset.left,
                    left: 'auto'
                });
            } else {
                this.container.css({
                    top: this.element.offset().top + this.element.outerHeight(),
                    left: this.element.offset().left - parentOffset.left,
                    right: 'auto'
                });
            }
        },

        show: function (e) {
            this.container.show();
            this.move();

            if (e) {
                e.stopPropagation();
                e.preventDefault();
            }

            this.changed = false;

            $(document).on('mousedown', $.proxy(this.hide, this));
        },

        hide: function (e) {
            this.container.hide();
            $(document).off('mousedown', this.hide);

            if (this.changed) {
                this.changed = false;
                this.notify();
            }
        },

        enterRange: function (e) {
            var label = e.target.innerHTML;
            if (label == this.locale.customRangeLabel) {
                this.updateView();
            } else {
                var dates = this.ranges[label];
                this.container.find('input[name=daterangepicker_start]').val(dates[0].toString(this.format));
                this.container.find('input[name=daterangepicker_end]').val(dates[1].toString(this.format));
            }
        },

        clickRange: function (e) {
            var label = e.target.innerHTML;
            if (label == this.locale.customRangeLabel) {
                this.container.find('.calendar').show();
            } else {
                var dates = this.ranges[label];

                this.startDate = dates[0];
                this.endDate = dates[1];

                this.leftCalendar.month.set({ month: this.startDate.getMonth(), year: this.startDate.getFullYear() });
                this.rightCalendar.month.set({ month: this.endDate.getMonth(), year: this.endDate.getFullYear() });
                this.updateCalendars();

                this.changed = true;

                this.container.find('.calendar').hide();
                this.hide();
            }
        },

        clickPrev: function (e) {
            var cal = $(e.target).parents('.calendar');
            if (cal.hasClass('left')) {
                this.leftCalendar.month.add({ months: -1 });
            } else {
                this.rightCalendar.month.add({ months: -1 });
            }
            this.updateCalendars();
        },

        clickNext: function (e) {
            var cal = $(e.target).parents('.calendar');
            if (cal.hasClass('left')) {
                this.leftCalendar.month.add({ months: 1 });
            } else {
                this.rightCalendar.month.add({ months: 1 });
            }
            this.updateCalendars();
        },

        enterDate: function (e) {

            var title = $(e.target).attr('title');
            var row = title.substr(1, 1);
            var col = title.substr(3, 1);
            var cal = $(e.target).parents('.calendar');

            if (cal.hasClass('left')) {
                this.container.find('input[name=daterangepicker_start]').val(this.leftCalendar.calendar[row][col].toString(this.format));
            } else {
                this.container.find('input[name=daterangepicker_end]').val(this.rightCalendar.calendar[row][col].toString(this.format));
            }

        },

        clickDate: function (e) {
            var title = $(e.target).attr('title');
            var row = title.substr(1, 1);
            var col = title.substr(3, 1);
            var cal = $(e.target).parents('.calendar');

            if (cal.hasClass('left')) {
                startDate = this.leftCalendar.calendar[row][col];
                endDate = this.endDate;
            } else {
                startDate = this.startDate;
                endDate = this.rightCalendar.calendar[row][col];
            }

            cal.find('td').removeClass('active');

            if (startDate.equals(endDate) || startDate.isBefore(endDate)) {
                $(e.target).addClass('active');
                if (!startDate.equals(this.startDate) || !endDate.equals(this.endDate))
                    this.changed = true;
                this.startDate = startDate;
                this.endDate = endDate;
            }

            this.leftCalendar.month.set({ month: this.startDate.getMonth(), year: this.startDate.getFullYear() });
            this.rightCalendar.month.set({ month: this.endDate.getMonth(), year: this.endDate.getFullYear() });
            this.updateCalendars();
        },

        clickApply: function (e) {
            this.hide();
        },

        updateCalendars: function () {
            this.leftCalendar.calendar = this.buildCalendar(this.leftCalendar.month.getMonth(), this.leftCalendar.month.getFullYear());
            this.rightCalendar.calendar = this.buildCalendar(this.rightCalendar.month.getMonth(), this.rightCalendar.month.getFullYear());
            this.container.find('.calendar.left').html(this.renderCalendar(this.leftCalendar.calendar, this.startDate, this.minDate, this.endDate));
            this.container.find('.calendar.right').html(this.renderCalendar(this.rightCalendar.calendar, this.endDate, this.startDate, this.maxDate));
        },

        buildCalendar: function (month, year) {

            var firstDay = Date.today().set({ day: 1, month: month, year: year });
            var lastMonth = firstDay.clone().add(-1).day().getMonth();
            var lastYear = firstDay.clone().add(-1).day().getFullYear();

            var daysInMonth = Date.getDaysInMonth(year, month);
            var daysInLastMonth = Date.getDaysInMonth(lastYear, lastMonth);

            var dayOfWeek = firstDay.getDay();

            //initialize a 6 rows x 7 columns array for the calendar
            var calendar = Array();
            for (var i = 0; i < 6; i++) {
                calendar[i] = Array();
            }

            //populate the calendar with date objects
            var startDay = daysInLastMonth - dayOfWeek + this.locale.firstDay + 1;
            if (startDay > daysInLastMonth)
                startDay -= 7;

            if (dayOfWeek == this.locale.firstDay)
                startDay = daysInLastMonth - 6;

            var curDate = Date.today().set({ day: startDay, month: lastMonth, year: lastYear });
            for (var i = 0, col = 0, row = 0; i < 42; i++, col++, curDate = curDate.clone().add(1).day()) {
                if (i > 0 && col % 7 == 0) {
                    col = 0;
                    row++;
                }
                calendar[row][col] = curDate;
            }

            return calendar;

        },

        renderCalendar: function (calendar, selected, minDate, maxDate) {
            var html = '<table class="table-condensed">';
            html += '<thead>';
            html += '<tr>';
            
            // add empty cell for week number
            if (this.showWeekNumbers)
                html += '<th></th>';
            
            if (!minDate || minDate < calendar[1][1])
            {
                html += '<th class="prev available"><i class="fa fa-angle-left"></i></th>';
            }
            else
            {
                 html += '<th></th>';
            }
            html += '<th colspan="5" style="width: auto">' + this.locale.monthNames[calendar[1][1].getMonth()] + calendar[1][1].toString(" yyyy") + '</th>';
            if (!maxDate || maxDate > calendar[1][1])
            {
                html += '<th class="next available"><i class="fa fa-angle-right"></i></th>';
            }
            else
            {
                 html += '<th></th>';
            }

            html += '</tr>';
            html += '<tr>';
            
            // add week number label
            if (this.showWeekNumbers)
                html += '<th class="week">' + this.locale.weekLabel + '</th>';

            $.each(this.locale.daysOfWeek, function (index, dayOfWeek) {
                html += '<th>' + dayOfWeek + '</th>';
            });

            html += '</tr>';
            html += '</thead>';
            html += '<tbody>';

            for (var row = 0; row < 6; row++) {
                html += '<tr>';
                
                // add week number
                if (this.showWeekNumbers)
                    html += '<td class="week">' + calendar[row][0].getWeek() + '</td>';
                
                for (var col = 0; col < 7; col++) {
                    var cname = 'available ';
                    cname += (calendar[row][col].getMonth() == calendar[1][1].getMonth()) ? '' : 'off';

                    // Normalise the time so the comparison won't fail
                    selected.setHours(0,0,0,0);

                    if ( (minDate && calendar[row][col] < minDate) || (maxDate && calendar[row][col] > maxDate))
                    {
                        cname = 'off disabled';
                    }
                    else if (calendar[row][col].equals(selected))
                    {
                        cname += 'active';
                    }
                    
                    var title = 'r' + row + 'c' + col;
                    html += '<td class="' + cname + '" title="' + title + '">' + calendar[row][col].getDate() + '</td>';
                }
                html += '</tr>';
            }

            html += '</tbody>';
            html += '</table>';

            return html;

        }

    };

    $.fn.daterangepicker = function (options, cb) {
      this.each(function() {
        var el = $(this);
        if (!el.data('daterangepicker'))
          el.data('daterangepicker', new DateRangePicker(el, options, cb));
      });
      return this;
    };

} (window.jQuery);