大家在很多网站、软件上,应该都有见到过树形菜单这个东西,比方说你的电脑上的注册表编辑器,就是一个大型的树形菜单,有些树形菜单还能直接在每一个选项旁边打钩或者空着,也就是复选框。今天,我们就用JavaScript来实现带复选框的树形菜单。
HTML代码
<!doctype html> <html> <head> <meta charset="utf-8"> <title>无标题文档</title> <script type="text/javascript" src="wtree.js"></script> <link rel="stylesheet" href="dtree.css" type="text/css"> </head> <body> <div id="systree"></div> <script type="text/javascript"> var d = new dTree('d', 'images/system/menu/'); d.config.check=true; d.add(,-1,'系统菜单',"javascript:;",'提示'); d.add(100,0,'系统管理',"javascript:;",'所有系统管理功能'); d.add(790,100,'菜单管理',"javascript:;",'菜单管理'); d.add(800,100,'组织机构',"javascript:;",''); d.add(810,100,'用户管理',"javascript:;",''); d.add(3,810,'用户名',"javascript:;",''); d.add(102,0,'系统机构',"javascript:;",''); d.add(300,102,'人员管理',"javascript:;",''); d.add(301,102,'部门管理',"javascript:;",''); d.add(302,102,'机构管理',"javascript:;",''); d.add(103,0,'权限管理',"javascript:;",''); d.add(400,103,'角色维护,"javascript:;",''); d.add(401,103,'功能分配',"javascript:;",''); d.add(402,103,'角色分配',"javascript:;",''); document.getElementByld('systree').innerHTML=d; </script> </body> </html>
CSS代码,即HTML中引用的dtree.css
.dtree { font-family: Verdana, Geneva, Arial, Helvetica, sans-serif; font-size: 11px; color: #666; white-space: nowrap; } .dtree img { border: 0px; vertical-align: middle; } .dtree a { color: #333; 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: #333; text-decoration: underline; } .dtree a.nodeSel { background-color: #c0d2ec; } .dtree .clip { overflow: hidden; } .cx{ line-height:12px; padding:0px; margin:0px; width:12px; height:12px; vertical-align:middle; }
JavaScript代码,即HTML中引用的wtree.js
// 节点对象 function Node(id, pid, name, url, title, target, icon, iconOpen, open) { this.id = id; this.pid = pid; this.name = name; 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 树对象 function dTree(objName,iconPath) { this.config = { target: null, folderLinks: true, useSelection: true, useCookies: true, useLines: true, useIcons: true, useStatusText: false, closeSameLevel: false, inOrder: false, check:false //复选框是否被选择 }; if(!iconPath)iconPath="img/";//设置树节点图标路径 this.icon = { root: iconPath+'base.gif', folder: iconPath+'folder.gif', folderOpen: iconPath+'folderopen.gif', node: iconPath+'page.gif', empty: iconPath+'empty.gif', line: iconPath+'line.gif', join: iconPath+'join.gif', joinBottom: iconPath+'joinbottom.gif', plus: iconPath+'plus.gif', plusBottom: iconPath+'plusbottom.gif', minus: iconPath+'minus.gif', minusBottom: iconPath+'minusbottom.gif', nlPlus: iconPath+'nolines_plus.gif', nlMinus: iconPath+'nolines_minus.gif' }; this.cbCollection = new Object(); this.obj = objName; this.aNodes = []; this.aIndent = []; this.root = new Node(-1); this.selectedNode = null; this.selectedFound = false; this.completed = false; }; // 向节点序列中增加一个新节点 dTree.prototype.add = function(id, pid, name, url, title, target, icon, iconOpen, open) { this.aNodes[this.aNodes.length] = new Node(id, pid, name, url, title, target, icon, iconOpen, open); }; // 向页面输出树形 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; }; // 创建树结构 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; }; //通过id获得复选框对象 dTree.prototype.co=function(id){ if (this.cbCollection[id])return this.cbCollection[id]; for(var n=0; n<this.aNodes.length; n++){ if(this.aNodes[n].id==id){ this.cbCollection[id]=document.getElementById("c"+this.obj+n); break; } } return this.cbCollection[id]; }; //得到所有被选中的复选框的id值 dTree.prototype.getCheckedNodes=function(){ var res = new Array(); var cko;//checkobject for(var n=0; n<this.aNodes.length; n++){ cko = this.co(this.aNodes[n].id); if(cko.checked==true){ res[res.length]=this.aNodes[n].id; } } return res; } dTree.prototype.cc=function(nodeId){ var cs = document.getElementById("c"+this.obj+nodeId).checked; var n,node = this.aNodes[nodeId]; var len =this.aNodes.length; for (n=0; n<len; n++) { if (this.aNodes[n].pid == node.id) { document.getElementById("c"+this.obj+n).checked=cs; this.cc(n); } } if(cs==false)return; var pid=node.pid; var bSearch; do{ bSearch=false; for(n=0;n<len;n++){ if(this.aNodes[n].id==pid){ document.getElementById("c"+this.obj+n).checked=true; pid=this.aNodes[n].pid; bSearch= true; break; } } }while(bSearch==true) } // 创建节点图标,url和文本 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.check==true){ str+= '<input type="checkbox" class="cx" id="c'+ this.obj + nodeId + '" onclick="javascript:'+this.obj+'.cc('+nodeId+')"/>'; } 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="' + ( (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; }; //判断当前节点是带子节点并且是否是最终的兄弟节点 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; }; // 返回选中的节点 dTree.prototype.getSelected = function() { var sn = this.getCookie('cs' + this.obj); return (sn) ? sn : null; }; // 将选中的节点高亮显示 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); } }; //关闭或打开节点 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(); }; // 按特定节点展开树 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); }; //根据某个节点关闭所有同级别的节点 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]); } } } // 关闭一个节点下的所有子节点 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]); } } } // 改变节点状态(打开或关闭) 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'; }; // 清理一个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); }; //设置一个cookie的值 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' : ''); }; // 获得一个cookie的值 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); }; // 根据一个字符串获得所有打开的节点的id的值 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); }; 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 (!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; } };