如何在Rails中链接AJAX调用？要执行的一系列调用，具体取决于第一次调用的结果

I've a AJAX call, that pulls some initial data. Based on this data, I want to fire a series of AJAX calls, updating different parts of the page. It can be done using JS, with the XMLHttpRequest and onreadystatechange, checking for the status. If the first call is done and the response is 200, I can just fire a series of AJAX calls.I've a AJAX call, that pulls some initial data.