Chapter 17. Using Asynchronous Communication
An excellent example of this technology is Google Maps (see Figure 17-1), in which new sections of a map are downloaded from the server when needed, without requiring a page refresh.
Using asynchronous communication not only substantially reduces the amount of data that must be sent back and forth, but also makes web pages seamlessly dynamic—allowing them to behave more like self-contained applications. The results are a much improved user interface and better responsiveness.
What Is Asynchronous Communication?
Asynchronous communication as used today had its beginning with the release of Internet Explorer 5 in 1999, which introduced a new ActiveX object,