Js编写的菜单树

只需要提供这种JSON格式就ok了 其他的都可以直接引用这个代码进去

var testMenu=[
    {
        "name": "一级菜单",
        "submenu": [
            {
                "name": "二级菜单",
                "url": ""
            },
            {
                "name": "二级菜单",
                "url": ""
            }
        ]
    },
    {
        "name": "一级菜单",
        "submenu": [
            {
                "name": "二级菜单",
                "url": ""
            },
            {
                "name": "二级菜单",
                "submenu": [
                    {
                        "name": "三级菜单",
                        "submenu": [
                            {
                                "name": "四级菜单",
                                "url": ""
                            }
                        ]
                    },
                    {
                        "name": "三级菜单",
                        "url": ""
                    }
                ]
            },
            {
                "name": "二级菜单",
                "url": ""
            },
            {
                "name": "二级菜单",
                "submenu": [
                    {
                        "name": "三级菜单",
                        "submenu": [
                            {
                                "name": "四级菜单",
                                "url": ""
                            },
                            {
                                "name": "四级菜单",
                                "submenu": [
                                    {
                                        "name": "五级菜单",
                                        "url": ""
                                    },
                                    {
                                        "name": "五级菜单",
                                        "url": ""
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "name": "三级菜单",
                        "url": ""
                    }
                ]
            },
            {
                "name": "二级菜单",
                "url": ""
            }
        ]
    },
    {
        "name": "一级菜单",
        "submenu": [
            {
                "name": "二级菜单",
                "url": ""
            },
            {
                "name": "二级菜单",
                "url": ""
            },
            {
                "name": "二级菜单",
                "url": ""
            }
        ]
    }
];

只要这种JSON格式就ok了 且上面的参数名 name submenu url是叫这样的名字就可以了 ，然后直接可以在页面HTML如下：

<div class="wrap-menu"></div>

CSS代码如下：

<style type="text/css">
    .wrap-menu { overflow:auto; width:300px; background:#F6F6F6; font:12px/1.5 Tahoma,Arial,sans-serif}
    .wrap-menu ul{ list-style:none; margin:; padding:;}
    .wrap-menu ul li{ text-indent:3em; white-space:nowrap; }
    .wrap-menu ul li h2{ cursor:pointer; height:100%; width:100%; margin:0 0 1px 0; font:12px/31px '宋体'; color:#fff; background:red;}
    .wrap-menu ul li a{ display:block; outline:none; height:25px; line-height:25px; margin:1px 0; color:#1A385C; text-decoration:none;}
    .wrap-menu ul li img{ margin-right:10px; margin-left:-17px; margin-top:9px; width:7px; height:7px; background:url(images/arrow.gif) no-repeat; border:none;}
    .wrap-menu ul li img.unfold{ background-position:0 -9px;}
    .wrap-menu ul li a:hover{ background-color:#ccc; background-image:none;}
  </style>

JS代码如下：

/**
 * JSON无限折叠菜单
 * @constructor {AccordionMenu}
 * @param {options} 对象
 * @date 2013-12-13
 * @author tugenhua
 * @email 879083421@qq.com
 */

 function AccordionMenu(options) {
    this.config = {
        containerCls        : '.wrap-menu',                // 外层容器
        menuArrs            :  '',                         //  JSON传进来的数据
        type                :  'click',                    // 默认为click 也可以mouseover
        renderCallBack      :  null,                       // 渲染html结构后回调
        clickItemCallBack   : null                         // 每点击某一项时候回调
    };
    this.cache = {

    };
    this.init(options);
 }

 AccordionMenu.prototype = {

    constructor: AccordionMenu,

    init: function(options){
        this.config = $.extend(this.config,options || {});
        var self = this,
            _config = self.config,
            _cache = self.cache;

        // 渲染html结构
        $(_config.containerCls).each(function(index,item){

            self._renderHTML(item);

            // 处理点击事件
            self._bindEnv(item);
        });
    },
    _renderHTML: function(container){
        var self = this,
            _config = self.config,
            _cache = self.cache;
        var ulhtml = $('<ul></ul>');
        $(_config.menuArrs).each(function(index,item){
            var lihtml = $('<li><h2>'+item.name+'</h2></li>');

            if(item.submenu && item.submenu.length > 0) {
                self._createSubMenu(item.submenu,lihtml);
            }
            $(ulhtml).append(lihtml);
        });
        $(container).append(ulhtml);

        _config.renderCallBack && $.isFunction(_config.renderCallBack) && _config.renderCallBack();

        // 处理层级缩进
        self._levelIndent(ulhtml);
    },
    /**
     * 创建子菜单
     * @param {array} 子菜单
     * @param {lihtml} li项
     */
    _createSubMenu: function(submenu,lihtml){
        var self = this,
            _config = self.config,
            _cache = self.cache;
        var subUl = $('<ul></ul>'),
            callee = arguments.callee,
            subLi;

        $(submenu).each(function(index,item){
            var url = item.url || 'javascript:void(0)';

            subLi = $('<li><a href="'+url+'">'+item.name+'</a></li>');
            if(item.submenu && item.submenu.length > 0) {

                $(subLi).children('a').prepend('<img src="data:images/blank.gif" alt=""/>');
                callee(item.submenu, subLi);
            }
            $(subUl).append(subLi);
        });
        $(lihtml).append(subUl);
    },
    /**
     * 处理层级缩进
     */
    _levelIndent: function(ulList){
        var self = this,
            _config = self.config,
            _cache = self.cache,
            callee = arguments.callee;

        var initTextIndent = 2,
            lev = 1,
            $oUl = $(ulList);

        while($oUl.find('ul').length > 0){
            initTextIndent = parseInt(initTextIndent,10) + 2 + 'em';
            $oUl.children().children('ul').addClass('lev-' + lev)
                        .children('li').css('text-indent', initTextIndent);
            $oUl = $oUl.children().children('ul');
            lev++;
        }
        $(ulList).find('ul').hide();
        $(ulList).find('ul:first').show();
    },
    /**
     * 绑定事件
     */
    _bindEnv: function(container) {
        var self = this,
            _config = self.config;

        $('h2,a',container).unbind(_config.type);
        $('h2,a',container).bind(_config.type,function(e){
            if($(this).siblings('ul').length > 0) {
                $(this).siblings('ul').slideToggle('slow').end().children('img').toggleClass('unfold');
            }

            $(this).parent('li').siblings().find('ul').hide()
                   .end().find('img.unfold').removeClass('unfold');
            _config.clickItemCallBack && $.isFunction(_config.clickItemCallBack) && _config.clickItemCallBack($(this));

        });
    }
 };

代码初始化方式如下：

$(function(){
    new AccordionMenu({menuArrs:testMenu});
});