In my previous post I needed the accound id of the current user for posting new list items. To retrieve the id, we can push this to the client from the code behind, or get the current user using Client Object Model. To provide a more generic way we can write a js function which get the current user. But we must even provide some callback functionality, otherwise we don’t know if the operation was successful or not. Let’s be inspired by success and error properties in $.ajax: