source: extensions/rv_menutree/trunk/rvtree.js @ 3572

/* this is not directly used - compress it as rvtree-min.js on http://www.compressjavascript.com/ or somewhere else
Based on Matt Kruse <matt@mattkruse.com> http://www.mattkruse.com/ */
var XElement = {
  hasClassName: function(element, className) {
    if (!element) return false;
    var elementClassName = element.className;
    if (elementClassName.length == 0) return false;
    if (elementClassName == className ||
        elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
      return true;
    return false;
  },

  addClassName: function(element, className) {
    if (!element) return;
    var classNames = element.className.split(/\s+/);
    for (var i=0; i<classNames.length; i++)
      if (className==classNames[i]) return;
    classNames.splice(0,0,className);
    element.className = classNames.join(' ');
    return element;
  },

  toggleClassName: function(element, className) {
    if (!element) return;
    var classNames = element.className.split(/\s+/);
    for (var i=0; i<classNames.length; i++)
      if (classNames[i]==className) break;
    if (i==classNames.length)
      classNames.splice(0,0,className);
    else
      classNames.splice(i, 1);
    element.className = classNames.join(' ');
    return element;
  }
};

var RVTree =
{
        options :
        {
                nodeClosedClass: "liClosed",
                nodeOpenClass: "liOpen",
                nodeBulletClass: "liBullet",
                nodeLinkClass: "bullet"
        },

        convertTree: function (root)
        {
                if (!document.createElement) return; // Without createElement, we can't do anything
                RVTree._processList(root, true);
        },

        _processList: function(ul, isRoot)
        {
                if (!ul.childNodes || ul.childNodes.length==0) return;

                for (var i=0; i<ul.childNodes.length; i++)
                { //Iterate LIs
      var item = ul.childNodes[i];
      if (item.nodeName != "LI")
        continue;

      // Iterate things in this LI
                  var subLists = false;
                  for (var sitemi=0;sitemi<item.childNodes.length;sitemi++)
      {
        var sitem = item.childNodes[sitemi];
        if (sitem.nodeName=="UL")
        {
          subLists = true;
          RVTree._processList(sitem, false);
        }
                        }

                        var s= document.createElement("SPAN");
                        var t= '\u00A0'; // &nbsp;
                        s.className = RVTree.options.nodeLinkClass;
                        if (subLists)
      {
                                // This LI has UL's in it, so it's a +/- node
                                if ( !XElement.hasClassName(item, RVTree.options.nodeOpenClass) )
                                        XElement.addClassName(item, RVTree.options.nodeClosedClass);

                                // If it's just text, make the text work as the link also
                                if (item.firstChild.nodeName=="#text")
        {
                                        t = t+item.firstChild.nodeValue;
                                        item.removeChild(item.firstChild);
                                }
                                s.onclick = function ()
        {
          XElement.toggleClassName( this.parentNode, RVTree.options.nodeOpenClass );
          XElement.toggleClassName( this.parentNode, RVTree.options.nodeClosedClass );
                                        return false;
                                }
                        }
                        else
      {// No sublists
        if ( XElement.hasClassName(item, RVTree.options.nodeClosedClass) )
        {
          s.onclick = function()
          {
            var nodes = this.parentNode.getElementsByTagName("A");
            if (nodes.length)
              document.location = nodes[0].href;
          }
        }
        else
          XElement.addClassName(item, RVTree.options.nodeBulletClass);
                        }

                        item.style.listStyleType='none';
                        if (isRoot && /*IE*/ (window.attachEvent && !window.opera) )
        item.style.marginLeft="-16px"; // thats IE6 what about IE7 ?
                        if (s)
                        {
                                s.appendChild(document.createTextNode(t));
                                item.insertBefore(s,item.firstChild);
                        }
                }
                ul.style.marginLeft = 0;
                ul.style.paddingLeft = isRoot ? 0 : "8px";
        }
}