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/**
 * 更新会话框
 * @param  {object/string}   arg  设置对象或者url
 * @param  {function} callback 回调函数
 */
function updateDialog(arg,callback){
	var option = {
		//datagrid的Id
		datagridId: arg.datagridId ? arg.datagridId : "datagrid",
		//标志后端采取更新操作或者是添加操作的隐藏表单的id
		backEndFlagId: arg.backEndFlagId ? arg.backEndFlagId : "backEndFlagId",
		//addDialog的Id
		addDialogId: arg.addDialogId ? arg.addDialogId : "dialog",
		//url
		url: arg.url ? arg.url : arg,
		//回掉函数,一般情况下执行,数据加载到表单的操作
		callback: arg.callback ? arg.callback : callback,
	};


	var update = $("#"+option.datagridId).datagrid("getSelections");
	if (!update || update.length >1 || !update.length) {
		$.messager.alert("提示！","必须而且只能选择一条记录进行修改！","warning");
	} else {
		var ids = $("#"+option.datagridId).datagrid("getChecked");
		$("#"+option.addDialogId).dialog("open");
		$("#"+option.backEndFlagId).val("update");
		$.ajax({
			url : option.url + ids[0].id,
			type : "GET",
			beforeSend : function () {
				$.messager.progress({
					text : '正在加载中...',
				});
			},
			success : function (data, response, status) {
				$.messager.progress('close');
				if (data.flag == "success") {
					if(typeof callback === "function"){
						callback();
					}
			}else{
				$.messager.alert('提示！', '未知错误，请重试！', 'warning');
			}
			}
		});
	}
}