基于原生JavaScript的DOM树型菜单类实现与解析

树型菜单类概述与初始化

网络上关于树形菜单的JavaScript实现案例众多，笔者自行编写了一套树菜单类库，自认为效果尚可。现将其公开以供大家共享交流，期待与各位开发者共同进步。

/* KuoMart.com__MyKuoMart , Create By ybcola(at)163.com , 2006-7-2

Last Modified 2006-7-2 , ybcola@163.com */

Dtree类属性定义与DOM结构构建

function Dtree(){

this.MenuGroupClose="images/treeview_close.gif"; //菜单关闭图标

this.MenuGroupOpen="images/treeview_open.gif"; //菜单打开图标

this.MenuItemClass=""; //菜单项样式

this.MenuItemInfoClass=""; //菜单链接样式

this.MenuItemlPad="12px";//下级菜单缩进仁值

this.DefaultGroupState=false; //菜单组装入时默认状态

document.write("<div id=\"treeroot\"></div>");

this.Node=document.getElementById("treeroot");

//0结点DOM对像,数组1为连接显示，2为连接href，3为连接target,4为连接显示前图标

菜单项添加逻辑与节点渲染

this.AddItem=function(menuinfo){

var div=creatediv();

var div1=creatediv();

var ico=[this.MenuGroupClose,this.MenuGroupOpen];

div.className=this.MenuItemClass;

div1.style.marginLeft=this.MenuItemlPad;

div1.style.display=this.DefaultGroupState?"":"none";

var Node=menuinfo[0]?menuinfo[0][1]:this.Node;

var iteminfo="";

if(menuinfo[4]) iteminfo="<img src=\""+menuinfo[4]+"\" align=\"absmiddle\">";

if(menuinfo[2]) iteminfo+=" <a href=\""+menuinfo[2]+"\" target=\""+menuinfo[3]+"\" class=\""+this.MenuItemInfoClass+"\">";

iteminfo+=menuinfo[1];

if(menuinfo[2])iteminfo+="</a>";

div.innerHTML=iteminfo;

Node.appendChild(div);

Node.appendChild(div1);

子菜单展开交互与状态切换

if(menuinfo[0]){

if(!menuinfo[0][0].havechild) {

var as=document.createElement("img");

as.src=ico[1];

as.align="absmiddle";

as.onclick=function(){

swapshow(Node,as,ico);

menuinfo[0][0].insertBefore(as,menuinfo[0][0].firstChild);

as.insertAdjacentText("afterEnd"," ");

menuinfo[0][0].havechild=true;

return [div,div1];

辅助函数与折叠显示控制

function creatediv(){

var div=document.createElement("div");

return div;

function swapshow(obj,ico,oo){

if(obj.style.display!=""){

obj.style.display="";

ico.src=oo[0];

else{

obj.style.display="none";

ico.src=oo[1];