/************************************************************************************************************
(C) www.dhtmlgoodies.com, October 2005

Update log:
December, 19th, 2005 - Version 1.1: Added support for several trees on a page
January,  25th, 2006 - Version 1.2: Added onclick event to text nodes.
February, 3rd 2006 - Dynamic load nodes by use of Ajax


This is a script from www.dhtmlgoodies.com. You will find this and a lot of other scripts at our website.	

Terms of use:
You are free to use this script as long as the copyright message is kept intact. However, you may not
redistribute, sell or repost it without our permission.

Thank you!

www.dhtmlgoodies.com
Alf Magne Kalleland

************************************************************************************************************/
	
var idOfFolderTrees = ['dhtmlgoodies_tree','dhtmlgoodies_tree2'];

var imageFolder = 'images/';	// Path to images
var folderImage = 'dhtmlgoodies_folder.gif';
var plusImage = 'dhtmlgoodies_plus.gif';
var minusImage = 'dhtmlgoodies_minus.gif';
var initExpandedNodes = '';	// Cookie - initially expanded nodes;
var useAjaxToLoadNodesDynamically = true;
var ajaxRequestFile = 'writeNodes.php';
var contextMenuActive = true;	// Set to false if you don't want to be able to delete and add new nodes dynamically

var ajaxObjectArray = new Array();
var treeUlCounter = 0;
var nodeId = 1;

/*
These cookie functions are downloaded from 
http://www.mach5.com/support/analyzer/manual/html/General/CookiesJavaScript.htm
*/
function Get_TheCookie(name) { 
alert("[folder-tree-static.js::Get_TheCookie] Enter") ;
   var start = document.cookie.indexOf(name+"="); 
   var len = start+name.length+1; 
   if ((!start) && (name != document.cookie.substring(0,name.length))) return null; 
   if (start == -1) return null; 
   var end = document.cookie.indexOf(";",len); 
   if (end == -1) end = document.cookie.length; 
   return unescape(document.cookie.substring(len,end)); 
} 
// This function has been slightly modified
function Set_Cookie(name,value,expires,path,domain,secure) { 
  expires = expires * 60*60*24*1000;
  var today = new Date();
  var expires_date = new Date( today.getTime() + (expires) );
  var cookieString = name + "=" +escape(value) + 
    ( (expires) ? ";expires=" + expires_date.toGMTString() : "") + 
    ( (path) ? ";path=" + path : "") + 
    ( (domain) ? ";domain=" + domain : "") + 
    ( (secure) ? ";secure" : ""); 
  document.cookie = cookieString; 
} 

function expandAll(treeId)
{
  var menuItems = document.getElementById(treeId).getElementsByTagName('LI');
  for(var no=0;no<menuItems.length;no++){
    var subItems = menuItems[no].getElementsByTagName('UL');
    if(subItems.length>0 && subItems[0].style.display!='block'){
      showHideNode(false,menuItems[no].id.replace(/[^0-9]/g,''));
    }			
  }
}

function collapseAll(treeId)
{
  var menuItems = document.getElementById(treeId).getElementsByTagName('LI');
  for(var no=0;no<menuItems.length;no++){
    var subItems = menuItems[no].getElementsByTagName('UL');
    if(subItems.length>0 && subItems[0].style.display=='block'){
      showHideNode(false,menuItems[no].id.replace(/[^0-9]/g,''));
    }			
  }		
}

function getNodeDataFromServer(ajaxIndex,ulId,parentId)
{
  document.getElementById(ulId).innerHTML = ajaxObjectArray[ajaxIndex].response;
  ajaxObjectArray[ajaxIndex] = false;
  parseSubItems(ulId,parentId);
}

	
function parseSubItems(ulId,parentId)
{
	
  if (initExpandedNodes){
    var nodes = initExpandedNodes.split(',');
  }
  var branchObj = document.getElementById(ulId);
  var menuItems = branchObj.getElementsByTagName('LI');	// Get an array of all menu items
  for (var no=0; no<menuItems.length; no++) {
    var imgs = menuItems[no].getElementsByTagName('IMG');
    if(imgs.length>0)continue;
    nodeId++;
    var subItems = menuItems[no].getElementsByTagName('UL');
    var img = document.createElement('IMG');
    img.src = imageFolder + plusImage;
    img.onclick = showHideNode;
    if (subItems.length==0) img.style.visibility='hidden';
    else {
      subItems[0].id = 'tree_ul_' + treeUlCounter;
      treeUlCounter++;
    }
    var aTag = menuItems[no].getElementsByTagName('A')[0];
    aTag.onclick = showHideNode;
    if(contextMenuActive)aTag.oncontextmenu = showContextMenu;

    menuItems[no].insertBefore(img, aTag);
    menuItems[no].id = 'dhtmlgoodies_treeNode' + nodeId;
    var folderImg = document.createElement('IMG');
    if(menuItems[no].className){
      folderImg.src = imageFolder + menuItems[no].className;
    }else{
      folderImg.src = imageFolder + folderImage;
    }
    menuItems[no].insertBefore(folderImg,aTag);
    
    var tmpParentId = menuItems[no].getAttribute('parentId');
    if(!tmpParentId)tmpParentId = menuItems[no].tmpParentId;
    if(tmpParentId && nodes[tmpParentId])showHideNode(false,nodes[no]);	
  }		
}
		
			
function showHideNode(e,inputId)
{
  if(inputId){
    if(!document.getElementById('dhtmlgoodies_treeNode'+inputId))return;
    thisNode = document.getElementById('dhtmlgoodies_treeNode'+inputId).getElementsByTagName('IMG')[0]; 
  }else {
    thisNode = this;
    if(this.tagName=='A')thisNode = this.parentNode.getElementsByTagName('IMG')[0];	
  }
  if(thisNode.style.visibility=='hidden')return;
  var parentNode = thisNode.parentNode;
  inputId = parentNode.id.replace(/[^0-9]/g,'');
  if(thisNode.src.indexOf(plusImage)>=0){
    thisNode.src = thisNode.src.replace(plusImage,minusImage);
    var ul = parentNode.getElementsByTagName('UL')[0];
    ul.style.display='block';
    if(!initExpandedNodes)initExpandedNodes = ',';
    if(initExpandedNodes.indexOf(',' + inputId + ',')<0) initExpandedNodes = initExpandedNodes + inputId + ',';
		
    if(useAjaxToLoadNodesDynamically){	// Using AJAX/XMLHTTP to get data from the server
      var firstLi = ul.getElementsByTagName('LI')[0];
      var parentId = firstLi.getAttribute('parentId');
      if(!parentId)parentId = firstLi.parentId;
      if(parentId){
	ajaxObjectArray[ajaxObjectArray.length] = new AjaxJs.sack();
	var ajaxIndex = ajaxObjectArray.length-1;
	ajaxObjectArray[ajaxIndex].requestFile = ajaxRequestFile + '?parentId=' + parentId;					
	ajaxObjectArray[ajaxIndex].onCompletion = function() 
           { 
              getNodeDataFromServer(ajaxIndex,ul.id,parentId); 
           }; // Specify function that will be executed after file has been found					
	ajaxObjectArray[ajaxIndex].runAJAX();		// Execute AJAX function
      }			
    }
		
  }else{
    thisNode.src = thisNode.src.replace(minusImage,plusImage);
    parentNode.getElementsByTagName('UL')[0].style.display='none';
    initExpandedNodes = initExpandedNodes.replace(',' + inputId,'');
  }	
  Set_Cookie('dhtmlgoodies_expandedNodes',initExpandedNodes,500);
  
  return false;
}
	
var okToCreateSubNode = true;
function addNewNode(e)
{
  if(!okToCreateSubNode)return;
  setTimeout('okToCreateSubNode=true',200);
  contextMenuObj.style.display='none';
  okToCreateSubNode = false;
  source = contextMenuSource;
  while(source.tagName.toLowerCase()!='li')source = source.parentNode;
	

  /*
    if (e.target) source = e.target;
    else if (e.srcElement) source = e.srcElement;
    if (source.nodeType == 3) // defeat Safari bug
    source = source.parentNode; */
  //while(source.tagName.toLowerCase()!='li')source = source.parentNode;
  var nameOfNewNode = prompt('Name of new node');
  if(!nameOfNewNode)return;
  
  uls = source.getElementsByTagName('UL');
  if(uls.length==0){
    var ul = document.createElement('UL');
    source.appendChild(ul);
    
  }else{
    ul = uls[0];
    ul.style.display='block';
  }
  var img = source.getElementsByTagName('IMG');
  img[0].style.visibility='visible';
  var li = document.createElement('LI');
  li.className='dhtmlgoodies_sheet.gif';
  var a = document.createElement('A');
  a.href = '#';
  a.innerHTML = nameOfNewNode;
  li.appendChild(a);
  ul.id = 'newNode' + Math.round(Math.random()*1000000);
  ul.appendChild(li);
  parseSubItems(ul.id);
  saveNewNode(nameOfNewNode,source.getElementsByTagName('A')[0].id);
	
}
	
/* Save a new node */
function saveNewNode(nodeText,parentId)
{
  self.status = 'Ready to save node ' + nodeText + ' which is a sub item of ' + parentId;
  // Use an ajax method here to save this new node. example below:
  /*
    ajaxObjectArray[ajaxObjectArray.length] = new AjaxJs.sack();
    var ajaxIndex = ajaxObjectArray.length-1;
    ajaxObjectArray[ajaxIndex].requestFile = ajaxRequestFile + '?newNode=' + nodeText + '&parendId=' + parentId					
    ajaxObjectArray[ajaxIndex].onCompletion = function() { self.status = 'New node has been saved'; };	// Specify function that will be executed after file has been found					
    ajaxObjectArray[ajaxIndex].runAJAX();		// Execute AJAX function
  */		
}

function deleteNode()
{
  if(!okToCreateSubNode)return;		
  setTimeout('okToCreateSubNode=true',200);		
  contextMenuObj.style.display='none';
  source = contextMenuSource;
  
  if(!confirm('Click OK to delete the node ' + source.innerHTML))return;
  okToCreateSubNode = false;
  
  var parentLi = source.parentNode.parentNode.parentNode;
  while(source.tagName.toLowerCase()!='li')source = source.parentNode;		

  var lis = source.parentNode.getElementsByTagName('LI');
  source.parentNode.removeChild(source);
  if(lis.length==0)parentLi.getElementsByTagName('IMG')[0].style.visibility='hidden';
  deleteNodeOnServer(source.id);
}

function deleteNodeOnServer(nodeId)
{
  self.status = 'Ready to delete node' + nodeId;
  // Use an ajax method here to save this new node. example below:
  /*
    ajaxObjectArray[ajaxObjectArray.length] = new AjaxJs.sack();
    var ajaxIndex = ajaxObjectArray.length-1;
    ajaxObjectArray[ajaxIndex].requestFile = ajaxRequestFile + '?deleteNodeId=' + nodeId					
    ajaxObjectArray[ajaxIndex].onCompletion = function() { self.status = 'Node has been deleted successfully'; };	// Specify function that will be executed after file has been found					
    ajaxObjectArray[ajaxIndex].runAJAX();		// Execute AJAX function
  */				
	
}

function initTree()
{
 try
 {
  for(var treeCounter=0;treeCounter<idOfFolderTrees.length;treeCounter++){
    var dhtmlgoodies_tree = document.getElementById(idOfFolderTrees[treeCounter]);
    var menuItems = dhtmlgoodies_tree.getElementsByTagName('LI');	// Get an array of all menu items
    for(var no=0;no<menuItems.length;no++){					
      nodeId++;
      var subItems = menuItems[no].getElementsByTagName('UL');
      var img = document.createElement('IMG');
      img.src = imageFolder + plusImage;
      img.onclick = showHideNode;
      if(subItems.length==0)img.style.visibility='hidden';
      else {
	subItems[0].id = 'tree_ul_' + treeUlCounter;
	treeUlCounter++;
      }
      var aTag = menuItems[no].getElementsByTagName('A')[0];
      if(contextMenuActive)aTag.oncontextmenu = showContextMenu;
      aTag.onclick = showHideNode;
      menuItems[no].insertBefore(img,aTag);
      if(!menuItems[no].id)menuItems[no].id = 'dhtmlgoodies_treeNode' + nodeId;
      var folderImg = document.createElement('IMG');
      if(menuItems[no].className){
	folderImg.src = imageFolder + menuItems[no].className;
      }else{
	folderImg.src = imageFolder + folderImage;
      }
      menuItems[no].insertBefore(folderImg,aTag);
    }	
  }

  initExpandedNodes = Get_TheCookie('dhtmlgoodies_expandedNodes');
  if(initExpandedNodes){
    var nodes = initExpandedNodes.split(',');
    for(var no=0;no<nodes.length;no++){
      if(nodes[no])showHideNode(false,nodes[no]);	
    }			
  }
 } catch(error) {
  return ;
 }
}
	
//window.onload = initTree;