var ItemA = function() {
	this.itemName = "新增系统选项A";
	this.dbKey = "NEW_SYSTEM_CONFIG_ITEM_A";
};
lang.extend(ItemA, 'freequery.config.configitem.AbstractSystemConfigItem');
// 进行初始化化动作并返回一个 tr 元素
ItemA.prototype.init = function() {
	this.tr = document.createElement("tr");
	this.tr.height = "30";
	this.td1 = document.createElement("td");
	this.td1.align = "left";
	this.td1.width = "200px";
	this.td1.innerHTML = this.itemName + "：";
	this.tr.appendChild(this.td1);
	this.td2 = document.createElement("td");
	this.td2.innerHTML = "<input type='radio' name='newConfigItemA' id='yes' class='_yes' checked />"
			+ "<label >是</label>"
			+ "<input type='radio' name='newConfigItemA' id='no'  class='_no' />"
			+ "<label >否</label>";
	this.tr.appendChild(this.td2);
	this.td3 = document.createElement("td");
	this.td3.innerHTML = "初始值( 是  )";
	this.tr.appendChild(this.td3);
	this.td4 = document.createElement("td");
	this.td4.innerHTML = "<input class='button-buttonbar-noimage _defBtn ' value='恢复初始值' "
			+ "type='button' style='width:100%;' />";
	this.tr.appendChild(this.td4);
	this.radioyes = domutils.findElementByClassName( [ this.tr ], "_yes");
	this.radiono = domutils.findElementByClassName( [ this.tr ], "_no");
	this.resetBtn = domutils.findElementByClassName( [ this.tr ], "_defBtn");
	var that = this;
	this.addListener(this.resetBtn, "click", function() {
		that.radioyes.checked = true;
		that.radiono.checked = false;
	}, this);
	return this.tr;
}
// 检查配置信息是否合法	
ItemA.prototype.validate = function() {
	return true;
}
// 保存配置并返回是否保存成功，对于从系统配置表里的获取数据的配置项来说，返回一个对象
ItemA.prototype.save = function() {
	if (!this.validate())
		return false;
	var obj = {
		key : this.dbKey,
		value : '' + this.radioyes.checked
	};
	return obj;
}
// 对于从系统配置表里的获取数据的配置项来说，需要在初始化后根据配置信息来显示
ItemA.prototype.handleConfig = function(systemConfig) {
	for ( var i in systemConfig) {
		var config = systemConfig[i];
		if (config && config.key == this.dbKey) {
			var v = (config.value == 'true');
			this.radioyes.setAttribute("__checked", v);
			this.radiono.setAttribute("__checked", !v);
			break;
		}
	}
};