一个很实用和好用的资源管理器的树形目录源码

本原码从网上下载，经本人改写，功能更强大，使用更方便，可以有无限级目录，一次性载入，可以分别设置树结点和叶结点的颜色及图标，可以展开和收缩，可以显示当前所处的路径位置，点击树结点时只在展开时显示树结点的超链接，不过，据测试，一次性载入500个节点时浏览器会显示“该脚本会使浏览器变慢”的提示，不过，选择不取消执行不会影响浏览器的性能。
function folder(folderdescription, hreference,parentid,target) {
 //constant data;

 this.desc = folderdescription;
 this.parentid=parentid;
 this.hreference = hreference;
 this.target=target;
 this.id = index;
 this.navobj = 0;
 this.iconimg = 0;
 this.nodeimg = 0;
 this.islastnode = 0;

 // dynamic data
 this.isroot = true;
 this.isopen = true;
 this.iconsrc=imageurl+"ftv2folderopen.gif";
 this.iconroot =imageurl+"ftv2folderopen.gif";

 this.children = new array;
 this.nchildren = 0;

 // methods
 this.initialize = initializefolder;
 this.setstate = setstatefolder;
 this.addchild = addchild;

 this.createindex = createentryindex;
 this.hide = hidefolder;
 this.display = display;
 this.renderob = drawfolder;
 this.totalheight = totalheight;
 this.subentries = foldersubentries;
 this.outputlink = outputfolderlink;

}

function setstatefolder(isopen) {
 var subentries;
 var totalheight;
 var fit = 0;
 var i = 0;

 if(isopen == this.isopen)
 return;

 if(browserversion == 2) {
 totalheight = 0
 for(i = 0; i  totalheight = totalheight + this.children[i].navobj.clip.height;
 subentries = this.subentries();

 if(this.isopen)
 totalheight = 0 - totalheight;

 for(fit = this.id + subentries + 1; fit  indexofentries[fit].navobj.moveby(0, totalheight);
 }

 this.isopen = isopen;
 propagatechangesinstate(this);
}

function propagatechangesinstate(folder) {

 var i = 0;
 if(folder.isopen) {
 if(folder.nodeimg) {
 if(folder.islastnode)
 folder.nodeimg.src = imageurl+"ftv2mlastnode.gif";
 else
 folder.nodeimg.src = imageurl+"ftv2mnode.gif";
 }

 if(this.isroot)
 folder.iconimg.src = imageurl+"ftv2_mail.gif";
 else
 folder.iconimg.src = imageurl+"ftv2folderopen.gif";

 for(i = 0; i  folder.children[i].display();
 }
 else {
 if(folder.nodeimg) {
 if(folder.islastnode)

 folder.nodeimg.src = imageurl+"ftv2plastnode.gif";
 else
 folder.nodeimg.src = imageurl+"ftv2pnode.gif";
 }

 if(this.isroot)
 folder.iconimg.src = imageurl+"ftv2_mail.gif";
 else
 folder.iconimg.src = imageurl+"ftv2folderclosed.gif";

 for(i = 0; i  folder.children[i].hide();
 }
}

function hidefolder() {
if(browserversion == 1) {
if(this.navobj.style.display == "none")
return;

this.navobj.style.display = "none";
}
else {
if(this.navobj.visibility == "hiden")
return;

this.navobj.visibility = "hiden";
}

this.setstate(0);
}

function initializefolder(level, lastnode, leftside) {
var i = 0;
var j = 0;

var numberoffolders;
var numberofdocs;

nc = this.nchildren;
this.createindex();

var nc;
var auxev = "";

if(browserversion > 0)
auxev = "";
else
auxev = "";

if(level > 0) {
if(lastnode) { //the last 'brother' in the children array
 this.renderob(leftside + auxev + "");
 leftside = leftside + "";
 this.islastnode = 1;
}
else {
this.renderob(leftside + auxev + "");
leftside = leftside + "";
this.islastnode = 0;
}
}
else {
this.renderob("");
}

if(nc > 0) {
level = level + 1;
for(i = 0; i if(i == this.nchildren-1)
this.children[i].initialize(level, 1, leftside);
else
this.children[i].initialize(level, 0, leftside);
}
}
}

function drawfolder(leftside) {
if(browserversion == 2) {
if(!doc.ypos)
doc.ypos = 8;

doc.write("");
}
doc.write("

if(browserversion == 1)
doc.write(" id='folder" + this.id + "' style='position:block;' ");

doc.write(" border=0 cellspacing=0 cellpadding=0>");
doc.write("

");
doc.write("

"); doc.write(leftside); this.outputlink(); doc.write("if(leftside == '') { doc.write("src='" + this.iconroot+"' border=0>"); } else { doc.write("src='" + this.iconsrc+"' border=0>"); } doc.write("

"); doc.write(" "); if(leftside == '') {  if(usetextlinks) { this.outputlink(); doc.write(''+this.desc + "");  }  else  doc.write(this.desc); } else { doc.write(""); doc.write(''+this.desc + ""); } doc.write(" "); doc.write("

");

if(browserversion == 2) {
doc.write("");
}

if(browserversion == 1) {
this.navobj = doc.all["folder"+this.id];
this.iconimg = doc.all["foldericon"+this.id]
this.nodeimg = doc.all["nodeicon"+this.id]
}
else if(browserversion == 2) {
this.navobj = doc.layers["folder"+this.id];
this.iconimg = this.navobj.document.images["foldericon"+this.id];
this.nodeimg = this.navobj.document.images["nodeicon"+this.id];
doc.ypos = doc.ypos + this.navobj.clip.height;
}
}

function outputfolderlink() {
if(this.hreference && this.target) {
doc.write("

if(browserversion > 0) {
doc.write("onclick='javascript: clickonfolder("+this.id+")'")
}
doc.write(">")
}
else
doc.write("")
}

function addchild(childnode) {
 selectfile[fentries]=childnode.desc;
 fentries++;
 this.children[this.nchildren] = childnode;
 this.nchildren++;
 return(childnode);
}

function foldersubentries() {
var i = 0;
var se = this.nchildren;

for(i = 0; i if(this.children[i].children) //is a folder
se = se + this.children[i].subentries();
}

return(se)
}

// definition of class item (a document or link inside a folder)

function item(itemdescription, hreference, itemlink, itemimg,parentid) // constructor
{
// constant data
this.desc = itemdescription
this.link = itemlink
this.hreference = hreference;
this.id =index;
this.navobj = 0; //initialized in render()
this.iconimg = 0; //initialized in render()

// iconsrc俊 瘤沥登绰 捞固瘤 颇老阑 阿 酒捞袍俊 嘎霸 瘤沥且 荐 乐档废 茄促 (格钎)
this.iconsrc = itemimg;

// methods
this.initialize = initializeitem ;
this.createindex = createentryindex;
this.hide = hideitem;
this.display = display;
this.renderob = drawitem;
this.totalheight = totalheight;

this.parentid=parentid;
//alert(this.parent);
}

function hideitem() {
if(browserversion == 1) {
if(this.navobj.style.display == "none")
return;
this.navobj.style.display = "none"
}
else {
if(this.navobj.visibility == "hiden")
return;
this.navobj.visibility = "hiden";
}
}

function initializeitem(level, lastnode, leftside) {
this.createindex();

if(level > 0) {
if(lastnode) { //the last 'brother' in the children array
this.renderob(leftside + "")
leftside = leftside + ""
}
else {
this.renderob(leftside + "")
leftside = leftside + ""
}
}
else
this.renderob("")
}

function drawitem(leftside) {

if(browserversion == 2)
doc.write("");

doc.write("

if(browserversion == 1)
doc.write(" id='item" + this.id + "' style='position:block;' ");
doc.write(" border=0 cellspacing=0 cellpadding=0>");
doc.write(" ");
doc.write(leftside);

if(this.link != "") doc.write("");
doc.write("doc.write("src='"+this.iconsrc+"' border=0>")

if(this.link != "")
doc.write("");

doc.write("

");
doc.write("

");
if(usetextlinks) {
if(this.link != "")
 doc.write("'+ this.desc + "");
else
doc.write(this.desc);
}
else {
doc.write(this.desc);
}

doc.write("

");
doc.write("")

if(browserversion == 2)
doc.write("");

if(browserversion == 1) {
this.navobj = doc.all["item"+this.id]
this.iconimg = doc.all["itemicon"+this.id]
}
else if(browserversion == 2) {
this.navobj = doc.layers["item"+this.id];
this.iconimg = this.navobj.document.images["itemicon"+this.id];
doc.ypos = doc.ypos+this.navobj.clip.height;
}
}

function addposition(id,str1){
if(id>0){
 clickedfolder = indexofentries[id];
 parentid=clickedfolder.parentid;
 parentname=indexofentries[parentid];
 pa=parentname.desc;
 if(parentid==0)str=pa+str1;
 else str='—>'+pa+str1;
 addposition(parentid,str);

}
}
var str="";
function veiwfile (msg) {
var typelogo=typeof top.logo;
if(typelogo=="undefined")return;
var tpyeframe=typeof top.logo.top1;
if(tpyeframe=="undefined")return;
objdocument= top.logo.top1;
var foldertext="";
if(msg==0)foldertext=selectfile[msg];
else {
 str='—>'+selectfile[msg];
 addposition(msg,str);
 foldertext=str;
}
objdocument.document.open();
objdocument.document.write(' 当前位置： '+foldertext+"");
objdocument.document.close();
}

// methods common to both objects (pseudo-inheritance)
function display() {
if(browserversion == 1)
this.navobj.style.display = "block";
else
this.navobj.visibility = "show";
}

function createentryindex() {
indexofentries[nentries] = this;
nentries++;
}

// total height of subentries open
function totalheight() { //used with browserversion == 2
var h = this.navobj.clip.height;
var i = 0;

if(this.isopen) { // is a folder and _is_ open
for(i = 0 ; i h = h + this.children[i].totalheight();
}
return h
}

// events

function clickonfolder(folderid) {
var clicked = indexofentries[folderid];
if(!clicked.isopen)
clickonnode(folderid);
if(clicked.isselected)
return;
}

function clickonnode(folderid) {
var clickedfolder = 0;
var state = 0;
clickedfolder = indexofentries[folderid];
state = clickedfolder.isopen;
if (!state){
 if(clickedfolder.target)clickedfolder.target.location=clickedfolder.hreference; //点击folder时显示相关链接页面
 veiwfile(folderid);
 }
clickedfolder.setstate(!state); //openclose
}

function initializedocument() {
if(doc.all)
browserversion = 1; //ie4
else if(doc.layers)
browserversion = 2; //ns4
else
browserversion = 0; //other

folderstree.initialize(0, 1, "");
//folderstree.display();

if(browserversion > 0) {
doc.write(" ");

// close the whole tree
clickonnode(0);

// open the root folder
clickonnode(0);
}
}

// auxiliary functions for folder-treee backward compatibility
function gfldr(description, hreference,parentid,target) {
var des;
index++;
if(fentries==0){
 selectfile[fentries]=description;
 fentries++;
}
des=description;
folder = new folder(des, hreference,parentid,target);
return(folder);
}

function glnk(target, description, linkdata, itemimg,parentid) {
fulllink = ""

if(target == 0 ||target=="") {
if(linkdata != "")
fulllink = "'"+linkdata+"' target=\"_blank\"";//显示在新开的窗体中
else
fulllink = "";
}
if(target == 1) {
if(linkdata != "" )
fulllink = "'"+linkdata+"' target=\"_slef\"";//显示在表单所在的框架或窗体中
else
fulllink = "";
}
else if(target == 2) {
if(linkdata != "")
fulllink = "'"+linkdata+"' target=\"_parent\""; //显示在包含表单的框架的父框架中
else
fulllink = "";
}
else if(target == 3) {
if(linkdata != "")
fulllink = "'"+linkdata+"' target=\"_top\"";//显示在顶层窗体中
else
fulllink = "";
}

else {//alert(target);
if(linkdata != "")
fulllink = "'"+linkdata+"' target="+target;//显示在target窗体中
else
fulllink = "";
}
index++; //当前节点编号

linkitem = new item(description, linkdata, fulllink, itemimg,parentid)
return linkitem
}

function insfldr(parentfolder, childfolder,target,hreference) {
var child;
var desc;
parentid=parentfolder.id;
child=gfldr(childfolder,hreference,parentid,target);
return(parentfolder.addchild(child));
}

function insdoc(parentfolder,target, description, linkdata, itemimg) {
var document;
var itemimg;
itemimg=imageurl+"bu.gif";
var desc;
parentid=parentfolder.id;
document=glnk(target, description, linkdata, itemimg,parentid);
parentfolder.addchild(document);
}

function setobjdocument(msg){
if (msg!=null){
 objdocument=msg;
}
}

//设置展开、收缩图片路径
function setimageurl(msg){
if (msg==null){
 imageurl="../leftfiles/images/";
}else imageurl=msg;
}

//设置超链接文本颜色
function setlinkcolor(msg){
 linkcolor=msg;
}
function setflodercolor(msg){
 flodercolor=msg;
}
// global variables

usetextlinks = 1;
indexofentries = new array;
nentries = 0;
index=-1;  //节点编号
doc = document;
browserversion = 0;
selectedfolder = 0;
selectfile=new array;
fentries=0;
var objdocument,imageurl;
var linkcolor="#085dde";
var flodercolor="#292c08";
var type1=typeof top.logo;

if (type1=="undefined"){
objdocument=null;
}

if(imageurl==null){
 setimageurl(imageurl);
}

将源代码和接前代码中的代码合并成一个treemenu.js文件，在在页面中引入即可