/**
 * $.ld
 * @extends jquery.1.4.2
 * @fileOverview 鍒涘缓涓€缁勮仈鍔ㄩ€夋嫨妗
 * @author 鏄庢渤鍏卞奖
 * @email mohaiguyan12@126.com
 * @site wwww.36ria.com
 * @version 0.2
 * @date 2010-08-18
 * Copyright (c) 2010-2010 鏄庢渤鍏卞奖
 * @example
 *    $(".ld-select").ld();
 */
(function($){
	$.fn.ld = function(options){
		var opts;
		var DATA_NAME = "ld";
		//杩斿洖API
		if(typeof options == 'string'){
			 if(options == 'api'){
			 	return $(this).data(DATA_NAME);
			 }
		}
		else{
			var options = options || {};
			//瑕嗙洊鍙傛暟
			opts = $.extend(true, {}, $.fn.ld.defaults, options);
		}
		if($(this).length > 0){
			var ld = new yijs.Ld(opts);
			ld.$applyTo = $(this);
			ld.render();
			$(this).data(DATA_NAME,ld);
		}
		return $(this);
	}
	var yijs = yijs || {};
	yijs.Ld = function(options){
		//鍙傛暟
		this.options = options;
		//璧蜂綔鐢ㄧ殑瀵硅薄
		this.$applyTo  = this.options.applyTo && $(this.options.applyTo) || null;
		//缂撳瓨鍓嶇紑
		this.cachePrefix = "data_";
		//鍐欏叆鍒伴€夋嫨妗嗙殑option鐨勬牱寮忓悕
		this.OPTIONS_CLASS = "ld-option";
		//缂撳瓨锛屼负涓€涓璞″瓧闈㈤噺銆
		this.cache = {};
	}
	yijs.Ld.prototype = {
		/**
		 * 杩愯
		 * @return {Object} this
		 */
		render: function(){
			var _that = this;
			var _opts = this.options;
			if (this.$applyTo != null && this.size() > 0) {
				_opts.style != null && this.css(_opts.style);
				//鍔犺浇榛樿鏁版嵁锛屽悜绗竴涓€夋嫨妗嗗～鍏呮暟鎹
				this.load(_opts.defaultLoadSelectIndex,_opts.defaultParentId);
				_opts.texts.length > 0 && this.selected(_opts.texts);
				//缁欐瘡涓€夋嫨妗嗙粦瀹歝hange浜嬩欢
				this.$applyTo.each(function(i){
					// i < _that.size()-1 &&
					 $(this).bind(_opts.drevent+".ld",{target:_that,index:i},_that.onchange);
				})
			}
			return this;
		},
		texts : function(ts){
			var that = this;
			var $select = this.$applyTo;
			var _arr = [];
			var txt = null;
			var $options;
			$select.each(function(){
				txt = $(this).children('.'+that.OPTIONS_CLASS+':selected').text();
				_arr.push(txt);
			})
			return _arr;
		},
		/**
		 * 鑾峰彇鑱斿姩閫夋嫨妗嗙殑鏁伴噺
		 * @return {Number} 閫夋嫨妗嗙殑鏁伴噺
		 */
		size : function(){
			return this.$applyTo.length;
		},
		/**
		 * 璁剧疆閫夋嫨妗嗙殑鏍峰紡
		 * @param {Object} style 鏍峰紡
		 * @return {Object} this
		 */
		css : function(style){
			style && this.$applyTo.css(style);
			return this;
		},
		/**
		 * 璇诲彇鏁版嵁锛屽苟鍐欏叆鍒伴€夋嫨妗
		 * @param {Number} selectIndex 閫夋嫨妗嗘暟缁勭殑绱㈠紩鍊
		 * @param {String} parent_id  鐖剁骇id
		 */
		load : function(selectIndex,parent_id,callback){
			var _that = this;
			//娓呯悊index浠ヤ笅鐨勯€夋嫨妗嗙殑閫夐」
			for(var i = selectIndex ; i< _that.size();i++){
				_that.removeOptions(i);
			}
			//瀛樺湪缂撳瓨鏁版嵁,鐩存帴浣跨敤缂撳瓨鏁版嵁鐢熸垚閫夋嫨妗嗙殑瀛愰」锛涗笉瀛樺湪锛屽垯璇锋眰鏁版嵁
			if(_that.cache[parent_id]){
				_that._create(_that.cache[parent_id],selectIndex);
				_that.$applyTo.eq(selectIndex).trigger("afterLoad");
				if(callback) callback.call(this);
			}else{
				var _ajaxOptions = this.options.ajaxOptions;
				var _d = _ajaxOptions.data;
				var _parentIdField = this.options.field['parent_id'];
				_d[_parentIdField] = parent_id;
				//浼犻€掔粰鍚庡彴鐨勫弬鏁
				_ajaxOptions.data = _d;
				//ajax鑾峰彇鏁版嵁鎴愬姛鍚庣殑鍥炶皟鍑芥暟
				_ajaxOptions.success = function(res){
                    	//console.log(res);
                    	var ops = res.data;
						//閬嶅巻鏁版嵁锛岃幏鍙杊tml瀛楃涓
						if (ops.length > 0) { //鏈彍鍗曟湁鍐呭鎵嶆樉绀猴紝鍚﹁€呴殣钘?dayrui娣诲姞)
							_that.$applyTo.eq(selectIndex).show();
						} else {
							_that.$applyTo.eq(selectIndex).hide();
							// 璇存槑宸茬粡閫夋嫨鍒板熬閮ㄤ簡
							var html = res.html;
                            if (html.length > 0) {
                            	$('#'+_that.options.inputId).html(html);
								//console.log('#'+_that.options.inputId+'_select');
							}
						}
						var _h = _that._getOptionsHtml(ops);
						_that._create(_h,selectIndex);
						_that.cache[parent_id] =  _h;
						_that.$applyTo.eq(selectIndex).trigger("afterLoad.ld");
						if(callback) callback.call(this);
					}
					$.ajax(_ajaxOptions);
				}
		},
		/**
		 * 鍒犻櫎鎸囧畾index绱㈠紩鍊肩殑閫夋嫨妗嗕笅鐨勯€夋嫨椤
		 * @param {Number} index 閫夋嫨妗嗙殑绱㈠紩鍊
		 * @return {Object} this
		 */
		removeOptions : function(index){
			this.$applyTo.eq(index).children("."+this.OPTIONS_CLASS).remove();
			return this;
		},
		selected : function(t,completeCallBack){
			var _that = this;
			if(t && typeof t == "object" && t.length > 0){
				var $select = this.$applyTo;
				_load(_that.options.defaultLoadSelectIndex,_that.options.defaultParentId);
			}
			/**
			 * 閫掑綊鑾峰彇閫夋嫨妗嗘暟鎹
			 * @param {Number} selectIndex 閫夋嫨妗嗙殑绱㈠紩鍊
			 * @param {Number} parent_id   id
			 */
			function _load(selectIndex,parent_id){
				_that.load(selectIndex,parent_id,function(){
					var id = _selected(selectIndex,t[selectIndex]);
					selectIndex ++;
					if(selectIndex > _that.size()-1) {
						if(completeCallBack) completeCallBack.call(this);
						return;
					}
					_load(selectIndex,id);
				});
			}
			/**
			 * 閫変腑鍖呭惈鎸囧畾鏂囨湰鐨勯€夋嫨椤
			 * @param {Number} index 閫夋嫨妗嗙殑绱㈠紩鍊
			 * @param {String} text  閫夋嫨妗嗙殑value鍊 (dayrui淇敼涓烘寜id鍖归厤)
			 * @return {Number} 璇ラ€夋嫨妗嗙殑value鍊
			 */
			function _selected(index,text){
				var id = 0;
				_that.$applyTo.eq(index).children().each(function(){
					if(text != undefined && text.toString() == $(this).val()){
						$(this).attr("selected",true);
						id = $(this).val();
						return;
					}
				})
				return id;
			}
			return this;
		},
		/**
		 * 閫夋嫨妗嗙殑鍊兼敼鍙樺悗瑙﹀彂鐨勪簨浠
		 * @param {Object} e 浜嬩欢
		 */
		onchange : function(e){
			//瀹炰緥鍖栧悗鐨勫璞″紩鐢
			var _that = e.data.target;
			//閫夋嫨妗嗙殑绱㈠紩鍊
			var index = e.data.index;
			//鐩爣閫夋嫨妗
			var $target = $(e.target);
			var _parentId = $target.val();
			var _i = index+1;
            _that.load(_i,_parentId);
		},
		/**
		 * 灏嗘暟鎹簮锛坖son鎴杧ml锛夎浆鎴恏tml
		 * @param {Object} data
		 * @return {String} html浠ｇ爜瀛楃涓
		 */
		_getOptionsHtml : function(data){
			var _that = this;
			var ajaxOptions = this.options.ajaxOptions;
			var dataType = ajaxOptions.dataType;
			var field = this.options.field;
			var _h = "";
			_h = _getOptions(data,dataType,field).join("");;
			/**
			 * 鑾峰彇閫夋嫨妗嗛」html浠ｇ爜鏁扮粍
			 * @param {Object | Array} data 鏁版嵁
			 * @param {String} dataType 鏁版嵁绫诲瀷
			 * @param {Object} field 瀛楁
			 * @return {Array} aStr
			 */
			function _getOptions(data,dataType,field){
				var optionClass = _that.OPTIONS_CLASS;
				var aStr = [];
				var id,name;
				if (dataType == "json") {
					$.each(data,function(i){
					    id   = data[i][field.region_id];
						name = data[i][field.region_name];
						var _option = "<option value='"+id+"' class='"+optionClass+"'>"+name+"</option>";
						aStr.push(_option);
					})
				}else if(dataType == "xml"){
					$(data).children().children().each(function(){
						id   = $(this).find(field.region_id).text();
						name = $(this).find(field.region_name).text();
						var _option = "<option value='"+id+"' class='"+optionClass+"'>"+name+"</option>";
						aStr.push(_option);
					})
				}
				return aStr;
			}
			return _h;
		},
		/**
		 * 鍚戦€夋嫨妗嗘坊鍔爃tml
		 * @param {String} _h html浠ｇ爜
		 * @param {Number} index 閫夋嫨妗嗙殑绱㈠紩鍊
		 */
		_create : function(_h,index){
			var _that = this;
			this.removeOptions(index);
			this.$applyTo.eq(index).append(_h);
		}
	}
	$.fn.ld.defaults = {
		/**閫夋嫨妗嗗璞℃暟缁?/
        selects : null,
        drevent : 'change',
		/**ajax閰嶇疆*/
		ajaxOptions : {
			url : null,
			type : 'get',
			data : {},
			dataType : 'json',
			success : function(){},
			beforeSend : function(){}
		},
		/**榛樿鐖剁骇id*/
		defaultParentId : 0,
		/**榛樿璇诲彇鏁版嵁鐨勯€夋嫨妗?/
		defaultLoadSelectIndex : 0,
		/**榛樿閫夋嫨妗嗕腑鐨勯€変腑椤?/
		texts : [],
		/**閫夋嫨妗嗙殑鏍峰紡*/
		style : null,
        inputId : null,
		/**閫夋嫨妗嗗€兼敼鍙樻椂鐨勫洖璋冨嚱鏁?/
		change : function(){},
		field : {
			region_id : "region_id",
			region_name : "region_name",
			parent_id : "parent_id"
		}

	}
})(jQuery);