So far, we have covered the two main ways you will use AJAX to send or receive data. When it comes to receiving data, it's usually not as simple as fetching the data and rendering it. In fact, you will most likely have a dependency on when you can fetch which data. A typical example of this is needing to perform a login call before you can fetch the remaining data. In some cases, it might be that you need to first log in, then fetch the data of the logged in user, and once you have that you can fetch messages, orders, or whichever kind of data you need that might be specific to a certain user. This whole phenomenon of fetching data in this way is called cascading calls.
Let's have a look at how we use cascading calls with ...
