最近看到大家都练习写树，偶也学习学习写了一个，大家多多批评，我好进步。

不过我看了一些树的xml文档都是在xml中就已经有了树的结构，所以我写了一个xml文档不用分层，来生成树的，不过要给每个节点定义编号和父编号。

写得有点糙，大家不要笑话，以后逐渐学习在改进。

演示地址: www.lapuasi.com/javascript/xmltree

使用方法:
var tree = new xmlTree('tree'); //生成对象
tree.mode = 1; //设置初始模式，默认全部关闭。0全部关闭，1全部展开
tree.createTree(); //输出树

Javascript代码:

运行代码框
/* JavaScript Document */ /* xmlTree v1.2 ================================= Infomation ---------------------- Author : Lapuasi E-Mail : lapuasi@gmail.com WebSite : http://www.lapuasi.com/javascript DateTime : 2005-12-25 Example ---------------------- var tree = new xmlTree('tree'); //生成对象 tree.mode = 1; //设置初始模式，默认全部关闭。0全部关闭，1全部展开 tree.createTree(); //输出树 for Internet Explorer, Mozilla Firefox */ function xmlTree(name) { this.name = name; //实例名称 this.xmlFile = 'xmltree.xml'; //默认xml文件 this.iconPath = 'images/' //默认图标路径 this.iconFolder = 'tree_icon_folder.gif'; //默认文件夹图标 this.iconFile = 'tree_icon_file.gif'; //默认文件图标 this.iconOpen = 'tree_arrow_open.gif'; //默认箭头展开图标 this.iconOver = 'tree_arrow_over.gif'; //默认箭头活动图标 this.iconClose = 'tree_arrow_close.gif'; //默认箭头关闭图标 this.mode = 0; //初始模式，默认全部关闭。0全部关闭，1全部展开 this.html = ''; //最终输出html代码 this.prevTip = null; //上一次被显示的tip的时间编号 (内部使用) this.prevSelected = null; //上一次被选中的节点的自动编号 (内部使用) } xmlTree.prototype.createXMLDOM = function() { //生成XMLDOM对象 var xmldom; if (window.ActiveXObject){ var xmldom = new ActiveXObject("Microsoft.XMLDOM"); } else { if (document.implementation && document.implementation.createDocument) { var xmldom = document.implementation.createDocument("","doc",null); } } xmldom.async = false; xmldom.resolveExternals = false; xmldom.validateOnParse = false; xmldom.preserveWhiteSpace = true; return xmldom; } xmlTree.prototype.createTree = function() { //生成并打印 var xmldom = this.createXMLDOM(); document.write('<div id="tree"><\/div>'); // 树所用层 document.write('<div id="treeTip"><\/div>'); //提示所用层 document.getElementById('treeTip').style.visibility = 'visible'; document.getElementById('treeTip').style.display = 'none'; if (xmldom.load(this.xmlFile)) { this.createNodes(xmldom); } else { this.html = 'Load XML Error'; } document.getElementById('tree').innerHTML = this.html; return; } xmlTree.prototype.getFirstChildData = function(obj, name) { //取得指定名称节点的第一个子节点的数据 var result = ''; if (typeof(obj) == 'object' && name != null && name != '') { var node = obj.getElementsByTagName(name); if (node != null && node.length > 0) { result = node[0].firstChild.data; } } return result; } xmlTree.prototype.checkChildNodes = function(obj, id) { //检测是否有分支 var result = false; var nodes = obj.getElementsByTagName('node'); if (nodes != null && nodes.length > 0) { //var pid; for (var i = 0; i < nodes.length; i++) { //pid = nodes[i].getAttribute('parentid'); if (nodes[i].getAttribute('parentid') == id) { result = true; break; } } } return result; } xmlTree.prototype.createNodes = function(obj, id) { //生成指定编号节点的树 if (typeof(id) == 'undefined') id = null; //如果没有id传入则为根节点 var nodes = obj.getElementsByTagName('node'); if (nodes != null && nodes.length > 0) { var modeClass, modeSrc, iconClass, iconSrc; var nid, npid, nname, nicon, nlink, ntarget, nexplain, hasChildNodes; //判断模式类型，并应用样式 modeClass = 'close'; modeSrc = this.iconPath + this.iconClose; if (this.mode == 1) { modeSrc = this.iconPath + this.iconOpen; modeClass = 'open'; } if (id == null) modeClass = 'open'; //若为根节点则显示 this.html += '<ul id="tree_' + id + '_c" class="' + modeClass + '">'; for (var i = 0; i < nodes.length; i++) { npid = nodes[i].getAttribute('parentid'); if (npid == id) { //初始化 modeClass = 'close'; iconClass = 'icon-file'; iconSrc = this.iconPath + this.iconFile; //取得节点编号并检测 nid = nodes[i].getAttribute('id'); this.html += '<li id="tree_' + nid + '"><span onclick="' + this.name + '.action(this,event);" onmouseover="' + this.name + '.action(this,event);" onmouseout="' + this.name + '.action(this,event);">'; //取得节点自定义图标 //判断是否含有子节点，并确定箭头和图标的图片及样式 nicon = this.getFirstChildData(nodes[i], 'icon'); hasChildNodes = this.checkChildNodes(obj, nid); if (hasChildNodes) { iconClass = ''; iconSrc = this.iconPath + this.iconFolder; this.html += '<img id="tree_' + nid + '_a" src="' + modeSrc + '" class="arrow" \/>'; //箭头 } if (nicon != '') iconSrc = nicon; this.html += '<img id="tree_' + nid + '_i" src="' + iconSrc + '" class="' + iconClass + '" \/>'; //图标 //取得节点连接 nlink = this.getFirstChildData(nodes[i], 'link'); if (nlink != '') { nlink = ' href="' + nlink + '"'; } else { nlink = ' href="javascript:;"'; } //取得节点目标 ntarget = this.getFirstChildData(nodes[i], 'target'); if (ntarget != '') { ntarget = ' target="' + ntarget + '"'; } //取得节点说明 nexplain = this.getFirstChildData(nodes[i], 'explain'); if (nexplain != '') { nexplain = ' onmouseover="' + this.name + '.treeTips(\'' + nexplain + '\');" onmouseout="' + this.name + '.treeTips();"' } //取得节点名称 nname = this.getFirstChildData(nodes[i], 'name'); this.html += '<a id="tree_' + nid + '_l" onclick="' + this.name + '.action(this,event);"' + nlink + ntarget + nexplain + '>' + nname + '<\/a><\/span>'; //obj.documentElement.removeChild(nodes[i]); if (hasChildNodes) this.createNodes(obj, nid); //迭代子节点 this.html += '<\/li>'; } } this.html += '<\/ul>'; } return; } xmlTree.prototype.action = function(obj, e) { //节点操作 e = e ? e : (window.event ? window.event : null); //获取操作类型 e = e.type; if (obj.tagName == 'A') { try { this.prevSelected.className = '';} catch(e) {} this.prevSelected = obj; obj.className = 'selected'; } if (obj.tagName == 'SPAN') { var arrow = obj.firstChild; //取得箭头对象 var borther = obj; while (borther.tagName != 'UL') { //取得分支对象 borther = borther.nextSibling; if (borther == null) break; } if (borther != null) { switch (e) { //检测操作类型并执行相应代码 case 'click': if (borther.className == 'open') { borther.className = 'close'; arrow.src = this.iconPath + this.iconClose; } else { borther.className = 'open'; arrow.src = this.iconPath + this.iconOpen; } break; case 'mouseover': if (arrow.tagName == 'IMG' && borther.className == 'close') { arrow.src = this.iconPath + this.iconOver; } break; case 'mouseout': if (arrow.tagName == 'IMG' && borther.className == 'close') { arrow.src = this.iconPath + this.iconClose; } break; } } } return; } xmlTree.prototype.treeTips = function(msg) { //提示栏 if (this.prevTip != null) clearTimeout(this.prevTip); var obj = document.getElementById('treeTip'); if (obj != null) { if (this.treeTips.arguments.length < 1) { // hide obj.style.display = 'none'; } else { // show obj.innerHTML = msg; this.prevTip = setTimeout('document.getElementById("treeTip").style.display = "block"',300); document.onmousemove = this.moveToMouseLoc; } } return; } xmlTree.prototype.moveToMouseLoc = function(e) { //移动到鼠标所在位置 var obj = document.getElementById('treeTip'); if (obj != null) { var offsetX = -10, offsetY = 20; var x = 0, y = 0; if (window.event) { x = event.x + document.body.scrollLeft; y = event.y + document.body.scrollTop; } else { x = e.pageX; y = e.pageY; } obj.style.left = x + offsetX + 'px'; obj.style.top = y + offsetY + 'px'; } return; }
[Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]

xml 数据:

运行代码框
<?xml version="1.0" encoding="utf-8"?> <!-- CODE BY Lapuasi.com [2005-12-14] Explain: =================================================== node 为树的一个节点，具有以下属性和内容 属性 id: 编号，如果不唯一，只取第一个，其余被忽略 (必须, 可以是任意字符组合) parentid: 父编号，没有则为父节点 (可选, 可以是任意字符组合) 内容 name: 名称 (必须) link: 连接 (可选) target: 目标 (可选) icon: 图标 (可选) explain: 说明 (可选) --> <root> <node id="n1"> <name>我的电脑</name> <icon>images/tree_icon_computer.gif</icon> <explain>显示连接到此计算机的驱动器和硬件</explain> </node> <node id="2" parentid="n1"> <name>硬盘驱动器 (C:)</name> <icon>images/tree_icon_driver.gif</icon> </node> <node id="3"> <name>网上邻居</name> <icon>images/tree_icon_net.gif</icon> <explain>显示到网站，网络计算机和FTP站点的快捷方式</explain> </node> <node id="4" parentid="n1"> <name>硬盘驱动器 (D:)</name> <icon>images/tree_icon_driver.gif</icon> </node> <node id="5" parentid="2"> <name>Windows</name> </node> <node id="6" parentid="3"> <name>menu6</name> </node> <node id="7" parentid="3"> <name>menu7</name> </node> <node id="8" parentid="3"> <name>menu8</name> </node> <node id="9" parentid="7"> <name>menu9</name> </node> <node id="10"> <name>回收站</name> <icon>images/tree_icon_recycler.gif</icon> <explain>包含您已经删除的文件和文件夹</explain> </node> <node id="11" parentid="5"> <name>system32</name> </node> <node id="12" parentid="11"> <name>system.dll</name> <link>http://www.lapuasi.com</link> <target>_blank</target> </node> <node id="13" parentid="7"> <name>menu13</name> </node> <node id="14" parentid="n1"> <name>DVD 驱动器</name> <icon>images/tree_icon_cdrom.gif</icon> </node> </root>
[Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]