dev/js/src/datepicker.js

/**
 * Date picker for the
 * Virtual Collection builder.
 */
define(['util'], function () {
  "use strict";

  var loc = KorAP.Locale;

  loc.WDAY = loc.WDAY || [
    'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa', 'Su'
  ];

  loc.MONTH = loc.MONTH || [
    'January', 'February', 'March', 'April',
    'May', 'June', 'July', 'August',
    'September', 'October', 'November',
    'December'
  ];

  var d = document;

  return {
    create : function () {
      return Object.create(this)._init();
    },

    _init : function () {
      return this;
    },

    select : function (year, month, day) {
      if (arguments.length >= 1) {
	this._selected = {'year' : year};
	if (arguments.length >= 2) {
	  this._selected['month'] = month;
	  if (arguments.length >= 3)
	    this._selected['day'] = day;
	};
	return this;
      };
      return this._selected;
    },

    show : function (year, month) {
      var picker = d.createElement('div');
      picker.classList.add('datepicker');
      this._showYear = year;
      this._showMonth = month;
      picker.appendChild(this._yearHelper());
      picker.appendChild(this._monthHelper());
      picker.appendChild(this._dayHelper());
      return picker;
    },

    incrYear : function () {
      this._showYear++;
      this._updateYear();
      this._updateMonth();
      this._updateDay();
      return;
    },

    decrYear : function () {
      this._showYear--;
      this._updateYear();
      this._updateMonth();
      this._updateDay();
      return;
    },

    incrMonth : function () {
      this._showMonth++;
      if (this._showMonth > 12) {
	this._showMonth = 1;
	this.incrYear();
      }
      else {
	this._updateMonth();
	this._updateDay();
      };
    },

    decrMonth : function () {
      this._showMonth--;
      if (this._showMonth < 1) {
	this._showMonth = 12;
	this.decrYear();
      }
      else {
	this._updateMonth();
	this._updateDay();
      };
    },

    _yearHelper : function () {
      var year = d.createElement('div');
      year.classList.add('year');

      // Decrement year
      year.appendChild(d.createElement('span'))
	.onclick = this.decrYear.bind(this);

      this._yElement = year.appendChild(d.createElement('span'));
      this._yElement.appendChild(document.createTextNode(this._showYear));

      // Increment year
      year.appendChild(d.createElement('span'))
	.onclick = this.incrYear.bind(this);

      return year;
    },

    _updateYear : function () {
      this._yElement.firstChild.data = this._showYear;
    },

    _monthHelper : function () {
      var month = d.createElement('div');
      month.classList.add('month');

      // Decrement month
      month.appendChild(d.createElement('span'))
	.onclick = this.decrMonth.bind(this);
      
      this._mElement = month.appendChild(d.createElement('span'));
      this._mElement.appendChild(
	document.createTextNode(loc.MONTH[this._showMonth-1])
      );
      
      // Increment month
      month.appendChild(d.createElement('span'))
	.onclick = this.incrMonth.bind(this);

      return month;
    },

    _updateMonth : function () {
      this._mElement.firstChild.data = loc.MONTH[this._showMonth-1];
    },

    _dayHelper : function () {
      var table = d.createElement('table');

      var tr = table.appendChild(d.createElement('thead'))
	.appendChild(d.createElement('tr'));
      for (var i = 0; i < 7; i++) {
	tr.appendChild(d.createElement('th'))
	  .appendChild(d.createTextNode(loc.WDAY[i]));
      };

      this._dBElement = this._dayBody();

      table.appendChild(this._dBElement);
      return table;
    },

    _dayBody : function () {
      var showDate = new Date(this._showYear, this._showMonth - 1, 1, 0, 0, 0, 0);
      var date     = new Date(this._showYear, this._showMonth - 1, 1, 0, 0, 0, 0);
      var today    = new Date();

      // Skip back to the previous monday (may be in the last month)
      date.setDate(date.getDate() - ((date.getDay() + 6) % 7));

      var tb = d.createElement('tbody');

      var s = this.select();

      // Iterate over all days of the table
      while (1) {

	// Loop through the week
	var tr = tb.appendChild(d.createElement('tr'));
	for (var i = 0; i < 7; i++) {
	  var td = tr.appendChild(d.createElement('td'));

	  // Not part of the current month
	  if (date.getMonth() !== showDate.getMonth())
	    td.classList.add('out');
	  
	  // This is the current day
	  if (date.getDate()     === today.getDate() &&
	      date.getMonth()    === today.getMonth() &&
	      date.getFullYear() === today.getFullYear()) {
	    td.classList.add('today');
	  };

	  // This is the day selected
	  if (s['day']) {
	    if (date.getDate()     === s['day'] &&
		date.getMonth()    === s['month']-1 &&
		date.getFullYear() === s['year']) {
	      td.classList.add('selected');
	    };
	  };

	  // Add the current day to the table
	  td.appendChild(
	    d.createTextNode(date.getDate())
	  );
	  
	  // Next day
	  date.setDate(date.getDate() + 1);
	};

	if (date.getMonth() !== showDate.getMonth())
	  break;
      };
      return tb;
    },

    _updateDay : function () {
      var newBody = this._dayBody();
      this._dBElement.parentNode.replaceChild(
	newBody,
	this._dBElement
      );
      this._dBElement = newBody;
    }
  };
});