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:
/* 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 + '"';
}
