tracks/tracks/public/javascripts/calendar-setup.js

/*  Copyright Mihai Bazon, 2002, 2003  |  http://dynarch.com/mishoo/
 * ---------------------------------------------------------------------------
 *
 * The DHTML Calendar
 *
 * Details and latest version at:
 * http://dynarch.com/mishoo/calendar.epl
 *
 * This script is distributed under the GNU Lesser General Public License.
 * Read the entire license text here: http://www.gnu.org/licenses/lgpl.html
 *
 * This file defines helper functions for setting up the calendar.  They are
 * intended to help non-programmers get a working calendar on their site
 * quickly.  This script should not be seen as part of the calendar.  It just
 * shows you what one can do with the calendar, while in the same time
 * providing a quick and simple method for setting it up.  If you need
 * exhaustive customization of the calendar creation process feel free to
 * modify this code to suit your needs (this is recommended and much better
 * than modifying calendar.js itself).
 */

// $Id: calendar-setup.js,v 1.25 2005/03/07 09:51:33 mishoo Exp $

/**
 *  This function "patches" an input field (or other element) to use a calendar
 *  widget for date selection.
 *
 *  The "params" is a single object that can have the following properties:
 *
 *    prop. name   | description
 *  -------------------------------------------------------------------------------------------------
 *   inputField    | the ID of an input field to store the date
 *   displayArea   | the ID of a DIV or other element to show the date
 *   button        | ID of a button or other element that will trigger the calendar
 *   eventName     | event that will trigger the calendar, without the "on" prefix (default: "click")
 *   ifFormat      | date format that will be stored in the input field
 *   daFormat      | the date format that will be used to display the date in displayArea
 *   singleClick   | (true/false) wether the calendar is in single click mode or not (default: true)
 *   firstDay      | numeric: 0 to 6.  "0" means display Sunday first, "1" means display Monday first, etc.
 *   align         | alignment (default: "Br"); if you don't know what's this see the calendar documentation
 *   range         | array with 2 elements.  Default: [1900, 2999] -- the range of years available
 *   weekNumbers   | (true/false) if it's true (default) the calendar will display week numbers
 *   flat          | null or element ID; if not null the calendar will be a flat calendar having the parent with the given ID
 *   flatCallback  | function that receives a JS Date object and returns an URL to point the browser to (for flat calendar)
 *   disableFunc   | function that receives a JS Date object and should return true if that date has to be disabled in the calendar
 *   onSelect      | function that gets called when a date is selected.  You don't _have_ to supply this (the default is generally okay)
 *   onClose       | function that gets called when the calendar is closed.  [default]
 *   onUpdate      | function that gets called after the date is updated in the input field.  Receives a reference to the calendar.
 *   date          | the date that the calendar will be initially displayed to
 *   showsTime     | default: false; if true the calendar will include a time selector
 *   timeFormat    | the time format; can be "12" or "24", default is "12"
 *   electric      | if true (default) then given fields/date areas are updated for each move; otherwise they're updated only on close
 *   step          | configures the step of the years in drop-down boxes; default: 2
 *   position      | configures the calendar absolute position; default: null
 *   cache         | if "true" (but default: "false") it will reuse the same calendar object, where possible
 *   showOthers    | if "true" (but default: "false") it will show days from other months too
 *
 *  None of them is required, they all have default values.  However, if you
 *  pass none of "inputField", "displayArea" or "button" you'll get a warning
 *  saying "nothing to setup".
 */
Calendar.setup = function (params) {
  function param_default(pname, def) { if (typeof params[pname] == "undefined") { params[pname] = def; } };

  param_default("inputField",     null);
  param_default("displayArea",    null);
  param_default("button",         null);
  param_default("eventName",      "click");
  param_default("ifFormat",       "%Y/%m/%d");
  param_default("daFormat",       "%Y/%m/%d");
  param_default("singleClick",    true);
  param_default("disableFunc",    null);
  param_default("dateStatusFunc", params["disableFunc"]);  // takes precedence if both are defined
  param_default("dateText",       null);
  param_default("firstDay",       null);
  param_default("align",          "Br");
  param_default("range",          [1900, 2999]);
  param_default("weekNumbers",    true);
  param_default("flat",           null);
  param_default("flatCallback",   null);
  param_default("onSelect",       null);
  param_default("onClose",        null);
  param_default("onUpdate",       null);
  param_default("date",           null);
  param_default("showsTime",      false);
  param_default("timeFormat",     "24");
  param_default("electric",       true);
  param_default("step",           2);
  param_default("position",       null);
  param_default("cache",          false);
  param_default("showOthers",     false);
  param_default("multiple",       null);

  var tmp = ["inputField", "displayArea", "button"];
  for (var i in tmp) {
    if (typeof params[tmp[i]] == "string") {
      params[tmp[i]] = document.getElementById(params[tmp[i]]);
    }
  }
  if (!(params.flat || params.multiple || params.inputField || params.displayArea || params.button)) {
    alert("Calendar.setup:\n  Nothing to setup (no fields found).  Please check your code");
    return false;
  }

  function onSelect(cal) {
    var p = cal.params;
    var update = (cal.dateClicked || p.electric);
    if (update && p.inputField) {
      p.inputField.value = cal.date.print(p.ifFormat);
      if (typeof p.inputField.onchange == "function")
        p.inputField.onchange();
    }
    if (update && p.displayArea)
      p.displayArea.innerHTML = cal.date.print(p.daFormat);
    if (update && typeof p.onUpdate == "function")
      p.onUpdate(cal);
    if (update && p.flat) {
      if (typeof p.flatCallback == "function")
        p.flatCallback(cal);
    }
    if (update && p.singleClick && cal.dateClicked)
      cal.callCloseHandler();
  };

  if (params.flat != null) {
    if (typeof params.flat == "string")
      params.flat = document.getElementById(params.flat);
    if (!params.flat) {
      alert("Calendar.setup:\n  Flat specified but can't find parent.");
      return false;
    }
    var cal = new Calendar(params.firstDay, params.date, params.onSelect || onSelect);
    cal.showsOtherMonths = params.showOthers;
    cal.showsTime = params.showsTime;
    cal.time24 = (params.timeFormat == "24");
    cal.params = params;
    cal.weekNumbers = params.weekNumbers;
    cal.setRange(params.range[0], params.range[1]);
    cal.setDateStatusHandler(params.dateStatusFunc);
    cal.getDateText = params.dateText;
    if (params.ifFormat) {
      cal.setDateFormat(params.ifFormat);
    }
    if (params.inputField && typeof params.inputField.value == "string") {
      cal.parseDate(params.inputField.value);
    }
    cal.create(params.flat);
    cal.show();
    return false;
  }

  var triggerEl = params.button || params.displayArea || params.inputField;
  triggerEl["on" + params.eventName] = function() {
    var dateEl = params.inputField || params.displayArea;
    var dateFmt = params.inputField ? params.ifFormat : params.daFormat;
    var mustCreate = false;
    var cal = window.calendar;
    if (dateEl)
      params.date = Date.parseDate(dateEl.value || dateEl.innerHTML, dateFmt);
    if (!(cal && params.cache)) {
      window.calendar = cal = new Calendar(params.firstDay,
                   params.date,
                   params.onSelect || onSelect,
                   params.onClose || function(cal) { cal.hide(); });
      cal.showsTime = params.showsTime;
      cal.time24 = (params.timeFormat == "24");
      cal.weekNumbers = params.weekNumbers;
      mustCreate = true;
    } else {
      if (params.date)
        cal.setDate(params.date);
      cal.hide();
    }
    if (params.multiple) {
      cal.multiple = {};
      for (var i = params.multiple.length; --i >= 0;) {
        var d = params.multiple[i];
        var ds = d.print("%Y%m%d");
        cal.multiple[ds] = d;
      }
    }
    cal.showsOtherMonths = params.showOthers;
    cal.yearStep = params.step;
    cal.setRange(params.range[0], params.range[1]);
    cal.params = params;
    cal.setDateStatusHandler(params.dateStatusFunc);
    cal.getDateText = params.dateText;
    cal.setDateFormat(dateFmt);
    if (mustCreate)
      cal.create();
    cal.refresh();
    if (!params.position)
      cal.showAtElement(params.button || params.displayArea || params.inputField, params.align);
    else
      cal.showAt(params.position[0], params.position[1]);
    return false;
  };

/*  if (params.inputField) {
    new DateDueKeyboardShortcutSupport(params.inputField, params.ifFormat, cal);
  }
*/
  return cal;
};

/* Adds keyboard shortcuts to the passed in date field:
 *
 *   't'         input today's date
 *   '+' or '='  increment the date in the field by one day
 *   '-'         decrement the date in the field by one day
 *
 * If the calendar is visible, the shortcuts play nicely with it. If not,
 * they still work properly. Pressing '+' when no date is entered in the
 * field will set the date to tomorrow, and likewise '-' with no date
 * entered will set the date to yesterday.
 */
DateDueKeyboardShortcutSupport = Class.create();
DateDueKeyboardShortcutSupport.prototype = {
  initialize: function(element, dateFormat) {
    this.element   = $(element);
    this.dateFormat = dateFormat || "%Y/%m/%d";
    Event.observe(this.element,'keypress',this.onkeypress.bindAsEventListener(this));
    title = this.element.getAttributeNode("title");
		tooltip = 'Shortcuts: [t] today; [-] previous day; [+] next day; Click to show calendar';
    if (title && title.value)
    {
      this.element.setAttribute("title", title.value + ' (' + tooltip + ')');
    }
    else
    {
        this.element.setAttribute("title", tooltip);
    }
  },
  onkeypress: function(event) {
    handled = true;
    switch (this.getCharFromKeyPressEvent(event)) {
      case "t":
        this.setTextBoxToTodaysDate();
        break;
      case "+": 
      case "=": 
        this.setTextBoxToNextDay();
        break;
      case "-": 
        this.setTextBoxToPreviousDay();
        break;
      default:
        handled = false;
        break;
    }
    if (handled) {
      this.cancel(event);
    }
  },
	
  setTextBoxToChronicDate : function() {
    today = new Date();
		this.setDate(today);
  },

  setTextBoxToTodaysDate : function() {
    today = new Date();
		this.setDate(today);
  },
  
  setTextBoxToNextDay : function() {
    this.addDaysToTextBoxDate(1);
  },
  
  setTextBoxToPreviousDay : function() {
    this.addDaysToTextBoxDate(-1);
  },

  addDaysToTextBoxDate : function(numDays) {
    date = Date.parseDate(this.element.value, this.dateFormat);
    date.setDate(date.getDate() + numDays);
    this.setDate(date);
  },

  setDate : function(date) {
    this.element.value = date.print(this.dateFormat);
		if (window.calendar) {
			window.calendar.setDate(date);
		}
  },
  
  cancel : function(event) {
    if (event.preventDefault) {
      event.preventDefault();
    }
    event.returnValue = false;
  },
  
  getCharFromKeyPressEvent : function(event) {
      var charCode = (event.charCode) ? event.charCode :
                     ((event.keyCode) ? event.keyCode :
                     ((event.which) ? event.which : 0));
    return String.fromCharCode(charCode);
  }
};