一：目标
要实现用一个树形结构的展示数据，每个节点（除了根节点）前有一个checkbox，同时，点击父节点，则子节点全选或者全不选，当选中了全部子节点，父节点选中；如下图所示：
同时可以在创建的时候，让某些节点默认选中或不选中；
注：本人把显示图标改成了false（个人觉得不好看），想用图标的话可以不用修改源文件，
useIcons : false// 想用图标，值为true
二：准备工作
1. dtree 的 js css等文件可以去官网上下载：http://destroydrop.com/javascripts/tree/
2.由于本人对js文件做出了修改，其中用到了jquery的选择器，所以引入一个jquery的js文件
三：详细步骤
1.如果要想将dtree引入到java的web项目中，请首先将js文件中的 function dTree(objName) 下的this.icon 下所有的图片路径修改成自己项目可以访问到的图片路径
this.icon = {
root : '/dtree/img/base.gif',
folder : '/dtree/img/folder.gif',
folderOpen : '/dtree/img/folderopen.gif',
node : '/dtree/img/page.gif',
empty : '/dtree/img/empty.gif',
line : '/dtree/img/line.gif',
join : '/dtree/img/join.gif',
joinBottom : '/dtree/img/joinbottom.gif',
plus : '/dtree/img/plus.gif',
plusBottom : '/dtree/img/plusbottom.gif',
minus : '/dtree/img/minus.gif',
minusBottom : '/dtree/img/minusbottom.gif',
nlPlus : '/dtree/img/nolines_plus.gif',
nlMinus : '/dtree/img/nolines_minus.gif'
};
2.在 function dTree(objName) 下this.config最后加入一个属性 userCheckbox，默认值为 true
this.config = {
target : null,
folderLinks : true,
useSelection : true,
useCookies : true,
useLines : true,
useIcons : false,//我给改了，不想让显示图标，太丑了 0.0 想要的话，改成true
useStatusText : false,
closeSameLevel : false,
inOrder : false,
useCheckbox : true //新加的
}
并在 function Node(id, pid, name, url,checked ,title, target, icon, iconOpen, open) 中加入一行代码：
this.checkedStatus = checked || false;// 选中状态，默认false，不选中
function Node(id, pid, name, url,checked ,title, target, icon, iconOpen, open) {
this.id = id;
this.pid = pid;
this.name = name;
this.url = url;
this.checkedStatus = checked || false;// 选中状态，默认false，不选中
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;
};
修改 dTree.prototype.add = function(id, pid, name, url, checked, title, target, icon, iconOpen, open) ， 添加了一个参数 checked：是否选中
dTree.prototype.add = function(id, pid, name, url, checked, title, target, icon, iconOpen, open) {
this.aNodes[this.aNodes.length] = new Node(id, pid, name, url,checked ,title, target, icon, iconOpen, open);
};
3.在 dTree.prototype.node = function(node, nodeId)下 if (this.config.useIcons) {} 结束之后加入以下代码，把checkbox加入进去，（checkbox做了美化，最后修改css文件），并判断是否默认选中：
if(this.config.useCheckbox == true && node.id != 0){
str += '<label class="demo--label">'
+ '<input type="checkbox" class="demo--radio" id="' + node.pid+ '_' + node.id
+ '" onclick="javascript:' + this.obj + '.cc(' + node.id
+ ',' + node.pid + ')"';
if (node.checkedStatus){
str += 'checked="checked"';
}
str += ' />'
+ '<span class="demo--checkbox demo--radioInput"></span>'
+ '</label>';
}
4. 在js文件的任意位置加入以下几个函数，为了实现父级子级 checkbox选中事件，代码中有详细注释，这里不做过多说明
//复选框onclick事件
dTree.prototype.cc=function(nodeId, nodePid){
//说明：checkbox的id由 nodePid + _ + nodeId 三部分组成
//获取当前节点的选中状态
var boo = $("#"+nodePid+"_"+nodeId).attr("checked");
//1. 判断有无子节点，如果有，则全部选中,并且递归判断子节点是否还有子节点
childsSelected(nodeId, boo); //2. 获取所有同级节点，判断是否都选中，如果都选中，则父节点也要选中
parentsSelected(nodePid);
} //递归选中父节点，参数1：父节点，参数2：选中状态
function parentsSelected(pid) {
//1. 获取所有同级checkbox的id集合
var siblings = getChilds(pid);
//由于至少还会有调用方法的那个节点本身，所以siblings里至少有一个值
var flag = $("#"+siblings[0]).attr("checked");
//如果flag为false，则不用看其他同级节点了，父节点的checkbox必然为false，为true的话，则继续看同级节点里有没有false
//只要有一个false，父节点都为false
if (flag){
for (var i = 1; i < siblings.length; i++){
if ($("#"+siblings[i]).attr("checked") != flag){
flag = false;
break;
}
}
}
// 获取父节点的选中状态 （父节点的id，_的后面部分是子节点_的前面部分）
var originalCheck = $("input[id$='_"+siblings[0].split("_")[0]+"']").attr("checked");
//如果父节点原本的选中状态和应该的选中状态不一致，则改变父节点选中状态，并递归调用本方法
if (originalCheck != flag){
$("input[id$='_"+siblings[0].split("_")[0]+"']").attr("checked", flag);
var parentCheckBoxId = $("input[id$='_"+siblings[0].split("_")[0]+"']").attr("id");
if (parentCheckBoxId != null){
parentsSelected(parentCheckBoxId.split("_")[0]);
}
} } //递归选中子节点,参数1：父节点id， 参数2：选中状态
function childsSelected(pid, boo) {
//获取所有下一级节点的checkbox的id
var childs = getChilds(pid);
if (childs.length == 0){
return;
}
//让所有子节点选中，并递归判断每一个子节点是否还有子节点，让每一层每一个都选中
for (var i = 0; i < childs.length; i++){
$("#"+childs[i]).attr("checked",boo);
childsSelected(childs[i].split("_")[1], boo);
}
} //获取下一级子节点的id
function getChilds(pid){
var arr = new Array();
$("input[id^='"+pid+"_']").each(function (i,chkbox) {
arr.push(chkbox.id);
})
return arr;
}
5.之前提到过，对checkbox做出了一点美化，所以css文件的最后请加上以下代码：
.demo--label{display:inline-block}
.demo--radio{display:none}
.demo--radioInput{background-color:#fff;border:1px solid rgba(0,0,0,0.15);border-radius:100%;display:inline-block;height:13px;margin-right:5px;margin-top:-1px;vertical-align:middle;width:13px;line-height:}
.demo--radio:checked + .demo--radioInput:after{background-color:#57ad68;border-radius:100%;content:"";display:inline-block;height:9px;margin:2px;width:9px}
.demo--checkbox.demo--radioInput,.demo--radio:checked + .demo--checkbox.demo--radioInput:after{border-radius:}
四：说明
至此应该是结束了，如果按照步骤不能实现，请留言评论，咱们可以互相探讨，本人亲测好使，最后附上全部的js代码和css代码把,
(如果想让某一个节点默认选中，则设置url后面的一个参数为 true ，
d.add(1,0,'Node 1','searchTest.page',true);
这样只会影响单节点，对父节点和子节点都没有影响)
dtree.js:
// Node object
function Node(id, pid, name, url,checked ,title, target, icon, iconOpen, open) {
this.id = id;
this.pid = pid;
this.name = name;
this.url = url;
this.checkedStatus = checked || false;// 选中状态，默认false，不选中
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) {
this.config = {
target : null,
folderLinks : true,
useSelection : true,
useCookies : true,
useLines : true,
useIcons : false,//我给改了，不想让显示图标，太丑了 0.0 想要的话，改成true
useStatusText : false,
closeSameLevel : false,
inOrder : false,
useCheckbox : true //新加的
}
this.icon = {
root : '/dtree/img/base.gif',
folder : '/dtree/img/folder.gif',
folderOpen : '/dtree/img/folderopen.gif',
node : '/dtree/img/page.gif',
empty : '/dtree/img/empty.gif',
line : '/dtree/img/line.gif',
join : '/dtree/img/join.gif',
joinBottom : '/dtree/img/joinbottom.gif',
plus : '/dtree/img/plus.gif',
plusBottom : '/dtree/img/plusbottom.gif',
minus : '/dtree/img/minus.gif',
minusBottom : '/dtree/img/minusbottom.gif',
nlPlus : '/dtree/img/nolines_plus.gif',
nlMinus : '/dtree/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;
};
// Adds a new node to the node array
dTree.prototype.add = function(id, pid, name, url, checked, title, target, icon, iconOpen, open) {
this.aNodes[this.aNodes.length] = new Node(id, pid, name, url,checked ,title, target, icon, 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">\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._hc) ? this.icon.folder : this.icon.node);
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="' + ((node._io) ? node.iconOpen : node.icon) + '" alt="" />';
}
if(this.config.useCheckbox == true && node.id != 0){
str += '<label class="demo--label">'
+ '<input type="checkbox" class="demo--radio" id="' + node.pid+ '_' + node.id
+ '" onclick="javascript:' + this.obj + '.cc(' + node.id
+ ',' + node.pid + ')"';
if (node.checkedStatus){
str += 'checked="checked"';
}
str += ' />'
+ '<span class="demo--checkbox demo--radioInput"></span>'
+ '</label>';
}
// if(this.config.useCheckbox == true && node.id != 0){
// str += '<input type="checkbox" id="' + node.pid+ '_' + node.id
// + '" onclick="javascript:' + this.obj + '.cc(' + node.id
// + ',' + node.pid + ')"/>';
// }
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;
};
//复选框onclick事件
dTree.prototype.cc=function(nodeId, nodePid){
//说明：checkbox的id由 nodePid + _ + nodeId 三部分组成
//获取当前节点的选中状态
var boo = $("#"+nodePid+"_"+nodeId).attr("checked");
//1. 判断有无子节点，如果有，则全部选中,并且递归判断子节点是否还有子节点
childsSelected(nodeId, boo);
//2. 获取所有同级节点，判断是否都选中，如果都选中，则父节点也要选中
parentsSelected(nodePid);
}
//递归选中父节点，参数1：父节点，参数2：选中状态
function parentsSelected(pid) {
//1. 获取所有同级checkbox的id集合
var siblings = getChilds(pid);
//由于至少还会有调用方法的那个节点本身，所以siblings里至少有一个值
var flag = $("#"+siblings[0]).attr("checked");
//如果flag为false，则不用看其他同级节点了，父节点的checkbox必然为false，为true的话，则继续看同级节点里有没有false
//只要有一个false，父节点都为false
if (flag){
for (var i = 1; i < siblings.length; i++){
if ($("#"+siblings[i]).attr("checked") != flag){
flag = false;
break;
}
}
}
// 获取父节点的选中状态 （父节点的id，_的后面部分是子节点_的前面部分）
var originalCheck = $("input[id$='_"+siblings[0].split("_")[0]+"']").attr("checked");
//如果父节点原本的选中状态和应该的选中状态不一致，则改变父节点选中状态，并递归调用本方法
if (originalCheck != flag){
$("input[id$='_"+siblings[0].split("_")[0]+"']").attr("checked", flag);
var parentCheckBoxId = $("input[id$='_"+siblings[0].split("_")[0]+"']").attr("id");
if (parentCheckBoxId != null){
parentsSelected(parentCheckBoxId.split("_")[0]);
}
}
}
//递归选中子节点,参数1：父节点id， 参数2：选中状态
function childsSelected(pid, boo) {
//获取所有下一级节点的checkbox的id
var childs = getChilds(pid);
if (childs.length == 0){
return;
}
//让所有子节点选中，并递归判断每一个子节点是否还有子节点，让每一层每一个都选中
for (var i = 0; i < childs.length; i++){
$("#"+childs[i]).attr("checked",boo);
childsSelected(childs[i].split("_")[1], boo);
}
}
//获取下一级子节点的id
function getChilds(pid){
var arr = new Array();
$("input[id^='"+pid+"_']").each(function (i,chkbox) {
arr.push(chkbox.id);
})
return arr;
}
// 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="' + ( (this.aIndent[n] == 1 && this.config.useLines) ? this.icon.line : this.icon.empty ) + '" alt="" />';
(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 += '" alt="" /></a>';
} else str += '<img src="' + ( (this.config.useLines) ? ((node._ls) ? this.icon.joinBottom : this.icon.join ) : this.icon.empty) + '" alt="" />';
}
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();
};
// 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) {
eDiv = document.getElementById('d' + this.obj + id);
eJoin = document.getElementById('j' + this.obj + id);
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';
};
// [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].id;
}
}
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;
}
};
dtree.css:
.dtree {
font-family: Verdana, Geneva, Arial, Helvetica, sans-serif;
font-size: 11px;
color: #;
white-space: nowrap;
}
.dtree img {
border: 0px;
vertical-align: middle;
}
.dtree a {
color: #;
text-decoration: none;
}
.dtree a.node, .dtree a.nodeSel {
white-space: nowrap;
padding: 1px 2px 1px 2px;
}
.dtree a.node:hover, .dtree a.nodeSel:hover {
color: #;
text-decoration: underline;
}
.dtree a.nodeSel {
background-color: #c0d2ec;
}
.dtree .clip {
overflow: hidden;
}
.demo--label{display:inline-block}
.demo--radio{display:none}
.demo--radioInput{background-color:#fff;border:1px solid rgba(,,,0.15);border-radius:%;display:inline-block;height:13px;margin-right:5px;margin-top:-1px;vertical-align:middle;width:13px;line-height:}
.demo--radio:checked + .demo--radioInput:after{background-color:#57ad68;border-radius:%;content:"";display:inline-block;height:9px;margin:2px;width:9px}
.demo--checkbox.demo--radioInput,.demo--radio:checked + .demo--checkbox.demo--radioInput:after{border-radius:}