/*==================================================
  $Id: tabber.js,v 1.9 2006/04/27 20:51:51 pat Exp $
  tabber.js by Patrick Fitzgerald pat@barelyfitz.com

  Documentation can be found at the following URL:
  http://www.barelyfitz.com/projects/tabber/

  License (http://www.opensource.org/licenses/mit-license.php)

  Copyright (c) 2006 Patrick Fitzgerald

  Permission is hereby granted, free of charge, to any person
  obtaining a copy of this software and associated documentation files
  (the "Software"), to deal in the Software without restriction,
  including without limitation the rights to use, copy, modify, merge,
  publish, distribute, sublicense, and/or sell copies of the Software,
  and to permit persons to whom the Software is furnished to do so,
  subject to the following conditions:

  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  ==================================================*/

function tabberObj(argsObj)
{
  var arg; /* name of an argument to override */

  this.div = null;

  this.classMain = "tabber";

  this.classMainLive = "tabberlive";

  this.classTab = "tabbertab";

  this.classTabDefault = "tabbertabdefault";

  this.classNav = "tabbernav";

  this.classTabHide = "tabbertabhide";

  this.classNavActive = "tabberactive";

  this.titleElements = ['h2','h3','h4','h5','h6'];

  this.titleElementsStripHTML = true;

  this.removeTitle = true;

  this.addLinkId = false;

  this.linkIdFormat = '<tabberid>nav<tabnumberone>';

  for (arg in argsObj) { this[arg] = argsObj[arg]; }

  this.REclassMain = new RegExp('\\b' + this.classMain + '\\b', 'gi');
  this.REclassMainLive = new RegExp('\\b' + this.classMainLive + '\\b', 'gi');
  this.REclassTab = new RegExp('\\b' + this.classTab + '\\b', 'gi');
  this.REclassTabDefault = new RegExp('\\b' + this.classTabDefault + '\\b', 'gi');
  this.REclassTabHide = new RegExp('\\b' + this.classTabHide + '\\b', 'gi');

  this.tabs = new Array();

  if (this.div) {

    this.init(this.div);

    this.div = null;
  }
}


/*--------------------------------------------------
  Methods for tabberObj
  --------------------------------------------------*/


tabberObj.prototype.init = function(e)
{
  var
  childNodes, /* child nodes of the tabber div */
  i, i2, /* loop indices */
  t, /* object to store info about a single tab */
  defaultTab=0, /* which tab to select by default */
  DOM_ul, /* tabbernav list */
  DOM_li, /* tabbernav list item */
  DOM_a, /* tabbernav link */
  aId, /* A unique id for DOM_a */
  headingElement; /* searching for text to use in the tab */

  /* Verify that the browser supports DOM scripting */
  if (!document.getElementsByTagName) { return false; }

  /* If the main DIV has an ID then save it. */
  if (e.id) {
    this.id = e.id;
  }

  /* Clear the tabs array (but it should normally be empty) */
  this.tabs.length = 0;

  /* Loop through an array of all the child nodes within our tabber element. */
  childNodes = e.childNodes;
  for(i=0; i < childNodes.length; i++) {

    /* Find the nodes where class="tabbertab" */
    if(childNodes[i].className &&
       childNodes[i].className.match(this.REclassTab)) {
      
      /* Create a new object to save info about this tab */
      t = new Object();
      
      /* Save a pointer to the div for this tab */
      t.div = childNodes[i];
      
      /* Add the new object to the array of tabs */
      this.tabs[this.tabs.length] = t;

      /* If the class name contains classTabDefault,
	 then select this tab by default.
      */
      if (childNodes[i].className.match(this.REclassTabDefault)) {
	defaultTab = this.tabs.length-1;
      }
    }
  }

  /* Create a new UL list to hold the tab headings */
  DOM_ul = document.createElement("ul");
  DOM_ul.className = this.classNav;
  
  /* Loop through each tab we found */
  for (i=0; i < this.tabs.length; i++) {

    t = this.tabs[i];

    t.headingText = t.div.title;

    /* Remove the title attribute to prevent a tooltip from appearing */
    if (this.removeTitle) { t.div.title = ''; }

    if (!t.headingText) {

      for (i2=0; i2<this.titleElements.length; i2++) {
	headingElement = t.div.getElementsByTagName(this.titleElements[i2])[0];
	if (headingElement) {
	  t.headingText = headingElement.innerHTML;
	  if (this.titleElementsStripHTML) {
	    t.headingText.replace(/<br>/gi," ");
	    t.headingText = t.headingText.replace(/<[^>]+>/g,"");
	  }
	  break;
	}
      }
    }

    if (!t.headingText) {
      /* Title was not found (or is blank) so automatically generate a
         number for the tab.
      */
      t.headingText = i + 1;
    }

    /* Create a list element for the tab */
    DOM_li = document.createElement("li");

    /* Save a reference to this list item so we can later change it to
       the "active" class */
    t.li = DOM_li;

    /* Create a link to activate the tab */
    DOM_a = document.createElement("a");
    DOM_a.appendChild(document.createTextNode(t.headingText));
    DOM_a.href = "javascript:void(null);";
    DOM_a.title = t.headingText;
    DOM_a.onclick = this.navClick;

    DOM_a.tabber = this;
    DOM_a.tabberIndex = i;

    if (this.addLinkId && this.linkIdFormat) {

      aId = this.linkIdFormat;
      aId = aId.replace(/<tabberid>/gi, this.id);
      aId = aId.replace(/<tabnumberzero>/gi, i);
      aId = aId.replace(/<tabnumberone>/gi, i+1);
      aId = aId.replace(/<tabtitle>/gi, t.headingText.replace(/[^a-zA-Z0-9\-]/gi, ''));

      DOM_a.id = aId;
    }

    DOM_li.appendChild(DOM_a);

    DOM_ul.appendChild(DOM_li);
  }

  e.insertBefore(DOM_ul, e.firstChild);

  e.className = e.className.replace(this.REclassMain, this.classMainLive);

  this.tabShow(defaultTab);

  if (typeof this.onLoad == 'function') {
    this.onLoad({tabber:this});
  }

  return this;
};


tabberObj.prototype.navClick = function(event)
{
  var
  rVal, /* Return value from the user onclick function */
  a, /* element that triggered the onclick event */
  self, /* the tabber object */
  tabberIndex, /* index of the tab that triggered the event */
  onClickArgs; /* args to send the onclick function */

  a = this;
  if (!a.tabber) { return false; }

  self = a.tabber;
  tabberIndex = a.tabberIndex;

  a.blur();

  if (typeof self.onClick == 'function') {

    onClickArgs = {'tabber':self, 'index':tabberIndex, 'event':event};

    /* IE uses a different way to access the event object */
    if (!event) { onClickArgs.event = window.event; }

    rVal = self.onClick(onClickArgs);
    if (rVal === false) { return false; }
  }

  self.tabShow(tabberIndex);

  return false;
};


tabberObj.prototype.tabHideAll = function()
{
  var i; /* counter */

  for (i = 0; i < this.tabs.length; i++) {
    this.tabHide(i);
  }
};


tabberObj.prototype.tabHide = function(tabberIndex)
{
  var div;

  if (!this.tabs[tabberIndex]) { return false; }

  div = this.tabs[tabberIndex].div;

  if (!div.className.match(this.REclassTabHide)) {
    div.className += ' ' + this.classTabHide;
  }
  this.navClearActive(tabberIndex);

  return this;
};


tabberObj.prototype.tabShow = function(tabberIndex)
{

  var div;

  if (!this.tabs[tabberIndex]) { return false; }

  this.tabHideAll();

  div = this.tabs[tabberIndex].div;

  div.className = div.className.replace(this.REclassTabHide, '');

  this.navSetActive(tabberIndex);

  if (typeof this.onTabDisplay == 'function') {
    this.onTabDisplay({'tabber':this, 'index':tabberIndex});
  }

  return this;
};

tabberObj.prototype.navSetActive = function(tabberIndex)
{
  this.tabs[tabberIndex].li.className = this.classNavActive;

  return this;
};


tabberObj.prototype.navClearActive = function(tabberIndex)
{
  this.tabs[tabberIndex].li.className = '';

  return this;
};


/*==================================================*/


function tabberAutomatic(tabberArgs)
{
  var
    tempObj, /* Temporary tabber object */
    divs, /* Array of all divs on the page */
    i; /* Loop index */

  if (!tabberArgs) { tabberArgs = {}; }
  
  tempObj = new tabberObj(tabberArgs);
  divs = document.getElementsByTagName("div");
  for (i=0; i < divs.length; i++) {
    if (divs[i].className &&
	divs[i].className.match(tempObj.REclassMain)) {
      tabberArgs.div = divs[i];
      divs[i].tabber = new tabberObj(tabberArgs);
    }
  }
  
  return this;
}

function tabberAutomaticOnLoad(tabberArgs)
{
  var oldOnLoad;

  if (!tabberArgs) { tabberArgs = {}; }

  oldOnLoad = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = function() {
      tabberAutomatic(tabberArgs);
    };
  } else {
    window.onload = function() {
      oldOnLoad();
      tabberAutomatic(tabberArgs);
    };
  }
}

if (typeof tabberOptions == 'undefined') {

    tabberAutomaticOnLoad();

} else {

  if (!tabberOptions['manualStartup']) {
    tabberAutomaticOnLoad(tabberOptions);
  }

}