/**

 * history_teacher.jsp中的js,最近浏览名师

 * @version: 1.0

 * @author: mingming

 */

$(function(){

	getHistory();

});

var historyCount=4; //保存历史记录个数

/**

 * 增加浏览历史记录

 * @param id 编号

 * @param name 姓名

 * @param photo 照片

 * @param grade 年级

 * @param subject 科目

 * @return

 */

function setHistory(id,name,photo,grade,subject){

	stringCookie=getCookie('history');

    var stringHistory=""!=stringCookie?stringCookie:"{history:[]}";

    var json=new JSONHistory(stringHistory);  //转成json

    var list = json['history'];  //获得json

    for (var i = 0; i < list.length; i++) {

    	try {

    		if(list[i].id == id){

        		list.splice(i,1); //删除重复数据，开始位置,删除个数

        		i=i-1; //下标归位

        	}

		} catch (e) {

			break;

		}

	}

    if(list.length>=historyCount){

    	//删除最开始的多余记录

    	var count = list.length - historyCount + 1; //需要删除的个数

    	list.splice(0,count); //开始位置,删除个数

    }

    var e="{id:'"+id+"',name:'"+name+"',photo:'"+photo+"',grade:'"+grade+"',subject:'"+subject+"'}";

    json['history'].push(e);//添加一个新的记录

    setCookie('history',json.toString(),365); //365天

}

/**

 * 获得浏览历史记录

 * @return

 */

function getHistory(){

	var historyJSON=getCookie('history');

	if(historyJSON==""){

	}else{

		var data = eval("("+historyJSON+")");

		var history = data['history']; //历史记录

		var length = history.length;

		if(length > historyCount){

			length = historyCount;

		}

		//从最后一个浏览记录开始获取

		var historyHtml="";

		for ( var i = length-1; i >= 0; i--) {

			historyHtml+=

			'<dd>'+

	          '<ul>'+

	            '<li class="recimg"><a href="'+PATH+"/teacher/teacherinfo?teacherVO.teacherId="+history[i].id+'"><img src="'+PATH + "/"+ history[i].photo +'" alt="" /></a></li>'+

	            '<li class="recinfo">'+

	              '<p><a href="'+PATH+"/teacher/teacherinfo?teacherVO.teacherId="+history[i].id+'">'+history[i].name+'</a></p>'+

	              '<p class="grayp">科目：'+history[i].subject+'</p>'+

	              '<p class="grayp">年级：'+history[i].grade+'</p>'+

	            '</li>'+

	          '</ul>'+

	        '</dd>';

		}

		if(historyHtml!=""){

			$("#historyTeacher").html('<h2>最近浏览名师</h2><dl>'+historyHtml+'</dl>');

		}

	}

}

/**

 * 添加cookie

 * @param cookName cookie名称

 * @param cookName cookie值

 * @param expiredays 时长

 */

function setCookie(cookName,cookValue,expiredays){

    var exdate=new Date();

    exdate.setDate(exdate.getDate()+expiredays*24*3600*1000);

    var cookieVal=cookName+ "=" +escape(cookValue)+((expiredays==null) ? "" : ";expires="+exdate.toGMTString())+";path=/";

    document.cookie=cookieVal;

}

/**

 * 获取cookie

 * @param cookName cookie名称

 * @return

 */

function getCookie(cookName)

{

    if(document.cookie.length>0){

    	var c_start = document.cookie.indexOf(cookName + "=");

    	if(c_start!=-1){ //存在

    		c_start = c_start + cookName.length + 1; //"history="后的开始位置

    		var c_end=document.cookie.indexOf(";",c_start); //找到JSESSIONID在的位置

    		if (c_end==-1){ //JSESSIONID不存在

    			c_end=document.cookie.length;

    		}

    		return unescape(document.cookie.substring(c_start,c_end));

        }

    }

    return "";

}

/**

 * JSON

 */

var JSONHistory = function(sJSON){

	this.objType = (typeof sJSON);

	if(this.objType=='string' && ''==sJSON){

	      sJSON = '{history:[]}' ;

	}

    this.self = [];

    (function(s,o){

    	for(var i in o){

    		o.hasOwnProperty(i)&&(s[i]=o[i],s.self[i]=o[i])

    		};})(this,(this.objType=='string')?eval('0,'+sJSON):sJSON);

};

JSONHistory.prototype = {

    toString:function(){

        return this.getString();

    },

    valueOf:function(){

        return this.getString();

    },

    getString:function(){

        var sA = [];

        (function(o){

            var oo = null;

            sA.push('{');

            for(var i in o){

                if(o.hasOwnProperty(i) && i!='prototype'){

                    oo = o[i];

                    if(oo instanceof Array){

                        sA.push(i+':[');

                        for(var b in oo){

                            if(oo.hasOwnProperty(b) && b!='prototype'){

                                sA.push(oo[b]+',');

                                if(typeof oo[b]=='object') arguments.callee(oo[b]);

                            }

                        }

                        sA.push('],');

                        continue;

                    }else{

                        sA.push(i+':\''+oo+'\',');

                    }

                    if(typeof oo=='object') arguments.callee(oo);

                }

            }

            sA.push('},');

        })(this.self);

        return sA.slice(0).join('').replace(/\[object object\],/ig,'').replace(/,\}/g,'}').replace(/,\]/g,']').slice(0,-1);

    },

    push:function(sName,sValue){

        this.self[sName] = sValue;

        this[sName] = sValue;

    }

};

setHistory(id,name,photo,grade,subject)