folder-tree-static.js

关于ajax在web2.0中的应用(主要是实例程序)

	/************************************************************************************************************
	(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 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_Cookie(name) { 
	   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++){
			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;
			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 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;
	}

	
	
	function initTree()
	{
		
		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];
				aTag.onclick = showHideNode;
				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);
			}	
		
		}
		initExpandedNodes = Get_Cookie('dhtmlgoodies_expandedNodes');
		if(initExpandedNodes){
			var nodes = initExpandedNodes.split(',');
			for(var no=0;no<nodes.length;no++){
				if(nodes[no])showHideNode(false,nodes[no]);	
			}			
		}	
	}
	
	window.onload = initTree;