在winform端，树状菜单是非常有用的，实现这个是非常便捷的，所以我想到在页面放入一个树状菜单的。我选择了dtree这个工具，网络上还有很多方法实现页面树状菜单的，不过我觉得这个比较好用的，而且配置比较简单，运用上上手很快。dtree是纯js的，所以不用导入jar包，并且配置只要在js内配置就好了。而且现在网络上有很多高手修改后的改良版，加了checkbox，更加方便。在开发过程中，最难的就是数据的交互的，因为dtree是纯js的，所以不存在和后台交互的方法，我的办法是先通过后台交互，将数据传递到页面，然后再传递到js内。后台传递到页面的数据我拼接成一个字符串，然后在js内切割，将数据整合成数组。
后台数据处理代码：
复制代码 代码如下:
Codepublic String GetLinkManByDID(){
try {
directories = this.directoryService.GetAllDirecoty();
selectlinkMans = this.linkManService.GetAllLinkMans();
String direStringstring = "";
String linkString = "";
for (int i = 0; i < directories.size(); i++) {
if (i<directories.size()-1) {
direStringstring+=directories.get(i).getID()+"-"+directories.get(i).getDirectoryName()+"+";
}
else {
direStringstring+=directories.get(i).getID()+"-"+directories.get(i).getDirectoryName();
}
}
for (int i = 0; i < selectlinkMans.size(); i++) {
if (i<selectlinkMans.size()-1) {
linkString+=selectlinkMans.get(i).getDirectory().getID()+"-"+selectlinkMans.get(i).getName()+"-"+selectlinkMans.get(i).getPhoneNum()+"+";
}
else {
linkString+=selectlinkMans.get(i).getDirectory().getID()+"-"+selectlinkMans.get(i).getName()+"-"+selectlinkMans.get(i).getPhoneNum();
}
}
ActionContext.getContext().getSession().put("directories", direStringstring);
ActionContext.getContext().getSession().put("allLinkMans", linkString);
} catch (Exception e) {
e.printStackTrace();
}
return SUCCESS;
}

我是用s2sh款家的，所以数据存放到session中方式是
ActionContext.getContext().getSession().put(key, value)
然后页面得到数据：
复制代码 代码如下:
<script type="text/javascript">
var linkmans= [];
var dires = [];
//linkmans = "${directories}".replace('[','').replace(']','').split(',');
linkmans="${allLinkMans}".split(',');
dires = "${directories}".split(',');
treeload(linkmans[0],dires[0]);
</script>

treeload 是我自己编写的一个js文件内的方法。
js：
复制代码 代码如下:
Codefunction treeload(linkmans , dires){
var linklist= String2linklist(linkmans);
var direslist = String2direlist(dires);
d = new dTree('d','./');
d.config.checkbox=true;//显示checkbox
d.config.objValueId='phoneNums';
d.icon.root='images/hr/home.png',
d.icon.folder='images/hr/group.gif',
d.icon.folderOpen='images/hr/group.gif',
d.icon.node='images/hr/nan.gif',
d.add(0,-1,'联系人',null);
var int = 0;
var direids = new Array();
var direpid= new Array();
for ( int; int < direslist.length; int++) {
d.add(int+1,0,direslist[int].name,false);
direids.push(direslist[int].id);
direpid.push(int+1);
}
d.add(int+1,0,'全部联系人',false);
direpid.push(int+1);
for ( var int2 = 0; int2 < linklist.length; int2++) {
for ( var int3 = 0; int3 < direpid.length-1; int3++) {
if(linklist[int2].did==direids[int3])
{
int++;
d.add(int+1,direpid[int3],linklist[int2].name,false,linklist[int2].phone);
}
}
}
for ( var int4 = 0; int4 < linklist.length; int4++) {
int++;
d.add(int+1,direpid[direpid.length-1],linklist[int4].name,false,linklist[int4].phone);
}

document.write(d);
}
function String2linklist(linkmans){
var linkarray = new Array();
var a = linkmans.split('+');
// alert(a[0]);
for ( var int = 0; int < a.length; int++) {
var b = a[int].split('-');
// alert(b[2]);
linkarray.push(new linkman(b[0],b[1],b[2]));
}
return linkarray;
}
function String2direlist(dires){
var direlist = new Array();
var a = dires.split('+');
for ( var int = 0; int < a.length; int++) {
var b = a[int].split('-');
// alert(b[1]);
direlist.push(new dire(b[0],b[1]));
}
return direlist;
}
function linkman(Did,name,phone){
this.did = Did;
this.name = name ;
this.phone=phone;
}
function dire(id ,name){
this.id= id;
this.name = name;
}

最后，效果图

                              

我改写的dtree 的js：
复制代码 代码如下:
// Node object
function Node(id, pid, name, checked, value, icon ,url, title, target, iconOpen, open) {
this.id = id;
this.pid = pid;
this.name = name;
//是否在该节点添加复选框并设置选中状态，true:选中，false:不选中，null:不添加
this.checked = checked==null?null:(checked || false);

this.value = value;//增加value属性，选中复选框，输入框内得到的就是这个value值
this.url = url;
this.title = title;
this.target = target;
this.icon = icon;
this.iconOpen = iconOpen;
this._io = open || false;
this._is = false;
this._ls = false;
this._hc = false;
this._ai = 0;
this._p;
};
// Tree object
function dTree(objName, path) {
//路径
this.path = path ||'';
//加载css文件
this.loadCssFile(this.path+'dtree.css');
this.config = {
target : null,
folderLinks : true,
useSelection : true,
useCookies : true,
useLines : true,
useIcons : true,
useStatusText : false,
closeSameLevel : false,
inOrder : false,
//是否显示复选框，true显示，false不显示
checkbox:false,
objValueId:''
}
this.icon = {
root : this.path + 'images/img/base.gif',
folder : this.path + 'images/img/folder.gif',
folderOpen : this.path + 'images/img/folderopen.gif',
node : this.path + 'images/img/page.gif',
empty : this.path + 'images/img/empty.gif',
line : this.path + 'images/img/line.gif',
join : this.path + 'images/img/join.gif',
joinBottom : this.path + 'images/img/joinbottom.gif',
plus : this.path + 'images/img/plus.gif',
plusBottom : this.path + 'images/img/plusbottom.gif',
minus : this.path + 'images/img/minus.gif',
minusBottom : this.path + 'images/img/minusbottom.gif',
nlPlus : this.path + 'images/img/nolines_plus.gif',
nlMinus : this.path + 'images/img/nolines_minus.gif'
};
this.obj = objName;
this.aNodes = [];
this.aIndent = [];
this.root = new Node(-1);
this.selectedNode = null;
this.selectedFound = false;
this.completed = false;
};
//设置选中节点
dTree.prototype.checkedNodes=function(){
if(this.config.objValueId==''){
return;
}
var val=document.getElementById(this.config.objValueId).value;
if(val==''){
return;
}
val=val.split(',');
var o=null;
for(var i=0;i<val.length;i++){
o=document.getElementById('cbx_'+this.obj+val[i]);
if(o){
o.checked=true;
}
}
};
//实现输入框内自动输入选中项的value值
dTree.prototype.update=function(){
if(this.config.objValueId==''){
return;
}
var cbx=null,v=[];
// v.push(aa);
var ns=this.aNodes;
for(var i=0;i<ns.length;i++){
cbx=document.getElementById('cbx_'+this.obj+ns[i].id);
if(cbx){
if(cbx.checked){
if(ns[i].pid!='0'){
v.push(cbx.value);//原先是得到节点的id的，换成value，可以实现选中联系人，得到号码。
}
}
}
}
document.getElementById(this.config.objValueId).value=v.join();
};
//加载css文件
dTree.prototype.loadCssFile=function (file) {
try{
var head=document.getElementsByTagName("head")[0];
var links=head.getElementsByTagName('link');
var i=0;
for(var i=0;i<links.length;i++){
if(links[i].getAttribute('href').toLowerCase().indexOf(file.toLowerCase())>-1){
return;
}
}
var f = document.createElement("link");
f.setAttribute("rel", "stylesheet");
f.setAttribute("type", "text/css");
f.setAttribute("href", file);
head.appendChild(f);
}catch(ex){
alert('加载css文件出错：'+ex.message);
}
};
// Adds a new node to the node array
dTree.prototype.add = function(id, pid, name, checked, value,icon,url, title, target,iconOpen, open) {
this.aNodes[this.aNodes.length] = new Node(id, pid, name, checked, value,icon,url, title, target, iconOpen, open);
};
// Open/close all nodes
dTree.prototype.openAll = function() {
this.oAll(true);
};
dTree.prototype.closeAll = function() {
this.oAll(false);
};
// Outputs the tree to the page
dTree.prototype.toString = function() {
var str = '<div class="dtree" id="dTree_'+this.obj+'">\n';
if (document.getElementById) {
if (this.config.useCookies) this.selectedNode = this.getSelected();
str += this.addNode(this.root);
} else str += 'Browser not supported.';
str += '</div>';
if (!this.selectedFound) this.selectedNode = null;
this.completed = true;
return str;
};
// Creates the tree structure
dTree.prototype.addNode = function(pNode) {
var str = '';
var n=0;
if (this.config.inOrder) n = pNode._ai;
for (n; n<this.aNodes.length; n++) {
if (this.aNodes[n].pid == pNode.id) {
var cn = this.aNodes[n];
cn._p = pNode;
cn._ai = n;
this.setCS(cn);
if (!cn.target && this.config.target) cn.target = this.config.target;
if (cn._hc && !cn._io && this.config.useCookies) cn._io = this.isOpen(cn.id);
if (!this.config.folderLinks && cn._hc) cn.url = null;
if (this.config.useSelection && cn.id == this.selectedNode && !this.selectedFound) {
cn._is = true;
this.selectedNode = n;
this.selectedFound = true;
}
str += this.node(cn, n);
if (cn._ls) break;
}
}
return str;
};
// Creates the node icon, url and text
dTree.prototype.node = function(node, nodeId) {
var str = '<div class="dTreeNode">' + this.indent(node, nodeId);
if (this.config.useIcons) {

if (!node.icon) node.icon = (this.root.id == node.pid) ? this.icon.root : ((node.pid==0) ? this.icon.folder : this.icon.node);
//node.pid==0 这个条件是我自己改的，如果群组内无人的话，还是用群组的icon，而不是联系人的icon，大家可以自己试试的
if (!node.iconOpen) node.iconOpen = (node._hc) ? this.icon.folderOpen : this.icon.node;
if (this.root.id == node.pid) {
node.icon = this.icon.root;
node.iconOpen = this.icon.root;
}
str += '<img id="i' + this.obj + nodeId + '" src="/UploadFiles/2021-04-02/' + ((node._io) ? node.iconOpen : node.icon) + '">}
/***添加checkbox显示***/
if(this.config.checkbox&&node.checked!=null){
str += '<input '+ (node.checked?'checked=\"checked\"':'') +' onclick=\"javascript: ' + this.obj + (node._hc &&node.pid != this.root.id?'.o(' + nodeId + ')':'.update()')+';\" type=\"checkbox\" value=\"'+node.value+'\" name=\"cbx_'+this.obj+'\" id=\"cbx_'+ this.obj + nodeId+'\" title=\"'+node.name+'\"\/>';
}
if (node.url) {
str += '<a id="s' + this.obj + nodeId + '" class="' + ((this.config.useSelection) ? ((node._is ? 'nodeSel' : 'node')) : 'node') + '" href="' + node.url + '"';
if (node.title) str += ' title="' + node.title + '"';
if (node.target) str += ' target="' + node.target + '"';
if (this.config.useStatusText) str += ' onmouseover="window.status=\'' + node.name + '\';return true;" onmouseout="window.status=\'\';return true;" ';
if (this.config.useSelection && ((node._hc && this.config.folderLinks) || !node._hc))
str += ' onclick="javascript: ' + this.obj + '.s(' + nodeId + ');"';
str += '>';
}
else if ((!this.config.folderLinks || !node.url) && node._hc && node.pid != this.root.id)
str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');" class="node">';
str += node.name;
if (node.url || ((!this.config.folderLinks || !node.url) && node._hc)) str += '</a>';
str += '</div>';
if (node._hc) {
str += '<div id="d' + this.obj + nodeId + '" class="clip" style="display:' + ((this.root.id == node.pid || node._io) ? 'block' : 'none') + ';">';
str += this.addNode(node);
str += '</div>';
}
this.aIndent.pop();
return str;
};
// Adds the empty and line icons
dTree.prototype.indent = function(node, nodeId) {
var str = '';
if (this.root.id != node.pid) {
for (var n=0; n<this.aIndent.length; n++)
str += '<img src="/UploadFiles/2021-04-02/' + ( (this.aIndent[n] == 1 && this.config.useLines) ? this.icon.line : this.icon.empty ) + '">(node._ls) ? this.aIndent.push(0) : this.aIndent.push(1);
if (node._hc) {
str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ');"><img id="j' + this.obj + nodeId + '" src="';
if (!this.config.useLines) str += (node._io) ? this.icon.nlMinus : this.icon.nlPlus;
else str += ( (node._io) ? ((node._ls && this.config.useLines) ? this.icon.minusBottom : this.icon.minus) : ((node._ls && this.config.useLines) ? this.icon.plusBottom : this.icon.plus ) );
str += '">} else str += '<img src="' + ( (this.config.useLines) ? ((node._ls) ? this.icon.joinBottom : this.icon.join ) : this.icon.empty) + '">}
return str;
};
// Checks if a node has any children and if it is the last sibling
dTree.prototype.setCS = function(node) {
var lastId;
for (var n=0; n<this.aNodes.length; n++) {
if (this.aNodes[n].pid == node.id) node._hc = true;
if (this.aNodes[n].pid == node.pid) lastId = this.aNodes[n].id;
}
if (lastId==node.id) node._ls = true;
};
// Returns the selected node
dTree.prototype.getSelected = function() {
var sn = this.getCookie('cs' + this.obj);
return (sn) ? sn : null;
};
// Highlights the selected node
dTree.prototype.s = function(id) {
if (!this.config.useSelection) return;
var cn = this.aNodes[id];
if (cn._hc && !this.config.folderLinks) return;
if (this.selectedNode != id) {
if (this.selectedNode || this.selectedNode==0) {
eOld = document.getElementById("s" + this.obj + this.selectedNode);
eOld.className = "node";
}
eNew = document.getElementById("s" + this.obj + id);
eNew.className = "nodeSel";
this.selectedNode = id;
if (this.config.useCookies) this.setCookie('cs' + this.obj, cn.id);
}
};
// Toggle Open or close
dTree.prototype.o = function(id) {
var cn = this.aNodes[id];
this.nodeStatus(!cn._io, id, cn._ls);
cn._io = !cn._io;
if (this.config.closeSameLevel) this.closeLevel(cn);
if (this.config.useCookies) this.updateCookie();
//更新选中值if(this.config.objValueId!='')
this.update();
};
// Open or close all nodes
dTree.prototype.oAll = function(status) {
for (var n=0; n<this.aNodes.length; n++) {
if (this.aNodes[n]._hc && this.aNodes[n].pid != this.root.id) {
this.nodeStatus(status, n, this.aNodes[n]._ls)
this.aNodes[n]._io = status;
}
}
if (this.config.useCookies) this.updateCookie();
};
// Opens the tree to a specific node
dTree.prototype.openTo = function(nId, bSelect, bFirst) {
if (!bFirst) {
for (var n=0; n<this.aNodes.length; n++) {
if (this.aNodes[n].id == nId) {
nId=n;
break;
}
}
}
var cn=this.aNodes[nId];
if (cn.pid==this.root.id || !cn._p) return;
cn._io = true;
cn._is = bSelect;
if (this.completed && cn._hc) this.nodeStatus(true, cn._ai, cn._ls);
if (this.completed && bSelect) this.s(cn._ai);
else if (bSelect) this._sn=cn._ai;
this.openTo(cn._p._ai, false, true);
};
// Closes all nodes on the same level as certain node
dTree.prototype.closeLevel = function(node) {
for (var n=0; n<this.aNodes.length; n++) {
if (this.aNodes[n].pid == node.pid && this.aNodes[n].id != node.id && this.aNodes[n]._hc) {
this.nodeStatus(false, n, this.aNodes[n]._ls);
this.aNodes[n]._io = false;
this.closeAllChildren(this.aNodes[n]);
}
}
}
// Closes all children of a node
dTree.prototype.closeAllChildren = function(node) {
for (var n=0; n<this.aNodes.length; n++) {
if (this.aNodes[n].pid == node.id && this.aNodes[n]._hc) {
if (this.aNodes[n]._io) this.nodeStatus(false, n, this.aNodes[n]._ls);
this.aNodes[n]._io = false;
this.closeAllChildren(this.aNodes[n]);
}
}
}
// Change the status of a node(open or closed)
dTree.prototype.nodeStatus = function(status, id, bottom) {
try{
eDiv = document.getElementById('d' + this.obj + id);
eJoin = document.getElementById('j' + this.obj + id);
//****选择
if(this.config.checkbox){
cbx = document.getElementById('cbx_' + this.obj + id);
cbx.checked=status;
cbxChild= eDiv.getElementsByTagName('input');
for(var i=0 ;i<cbxChild.length;i++){
cbxChild[i].checked=status;
}
}
//****选择
if (this.config.useIcons) {
eIcon = document.getElementById('i' + this.obj + id);
eIcon.src = (status) ? this.aNodes[id].iconOpen : this.aNodes[id].icon;
}
eJoin.src = (this.config.useLines)?
((status)?((bottom)?this.icon.minusBottom:this.icon.minus):((bottom)?this.icon.plusBottom:this.icon.plus)):
((status)?this.icon.nlMinus:this.icon.nlPlus);
eDiv.style.display = (status) ? 'block': 'none';
}catch(ex){
}
};
// [Cookie] Clears a cookie
dTree.prototype.clearCookie = function() {
var now = new Date();
var yesterday = new Date(now.getTime() - 1000 * 60 * 60 * 24);
this.setCookie('co'+this.obj, 'cookieValue', yesterday);
this.setCookie('cs'+this.obj, 'cookieValue', yesterday);
};
// [Cookie] Sets value in a cookie
dTree.prototype.setCookie = function(cookieName, cookieValue, expires, path, domain, secure) {
document.cookie =
escape(cookieName) + '=' + escape(cookieValue)
+ (expires ? '; expires=' + expires.toGMTString() : '')
+ (path ? '; path=' + path : '')
+ (domain ? '; domain=' + domain : '')
+ (secure ? '; secure' : '');
};
// [Cookie] Gets a value from a cookie
dTree.prototype.getCookie = function(cookieName) {
var cookieValue = '';
var posName = document.cookie.indexOf(escape(cookieName) + '=');
if (posName != -1) {
var posValue = posName + (escape(cookieName) + '=').length;
var endPos = document.cookie.indexOf(';', posValue);
if (endPos != -1) cookieValue = unescape(document.cookie.substring(posValue, endPos));
else cookieValue = unescape(document.cookie.substring(posValue));
}
return (cookieValue);
};
// [Cookie] Returns ids of open nodes as a string
dTree.prototype.updateCookie = function() {
var str = '';
for (var n=0; n<this.aNodes.length; n++) {
if (this.aNodes[n]._io && this.aNodes[n].pid != this.root.id) {
if (str) str += '.';
str += this.aNodes[n].value;
}
}
this.setCookie('co' + this.obj, str);
};
// [Cookie] Checks if a node id is in a cookie
dTree.prototype.isOpen = function(id) {
var aOpen = this.getCookie('co' + this.obj).split('.');
for (var n=0; n<aOpen.length; n++)
if (aOpen[n] == id) return true;
return false;
};
// If Push and pop is not implemented by the browser
if (!Array.prototype.push) {
Array.prototype.push = function array_push() {
for(var i=0;i<arguments.length;i++)
this[this.length]=arguments[i];
return this.length;
}
};
if (!Array.prototype.pop) {
Array.prototype.pop = function array_pop() {
lastElement = this[this.length-1];
this.length = Math.max(this.length-1,0);
return lastElement;
}
};

大家可以借鉴一下，自己弄个小工程试试，dtree还是不错的。