JSON无限折叠菜单编写实例_javascript技巧

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": ""
}
]
}
];

/**
* 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 = $('

');
$(_config.menuArrs).each(function(index,item){
var lihtml = $('

'+item.name+'

');

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 = $('

'),
callee = arguments.callee,
subLi;

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

subLi = $('

'+item.name+'

');
if(item.submenu && item.submenu.length > 0) {

$(subLi).children('a').prepend('');
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));

});
}
};

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