Chapter 2. Getting Our Feet Wet
Ho, Ajax! Once again I summon thee.
In this chapter, the idea is to take a walking tour, in baby steps, through some really simple Ajax examples. Rails provides a huge amount of power for doing complex Ajax interactions with very minimal code. But in order to understand what’s happening under the hood, you should be familiar with Ajax’s lowest levels (e.g., the
XMLHttpRequest object). By the end, you’ll be comfortable creating
If you’re already comfortable with Rails and basic Ajax, this chapter will be review, but you might still find it useful to at least skim the examples.
The Old-Fashioned Way
To start off, let’s do Ajax with the simplest thing that could possibly work: click a link and present a response from the server—using
XMLHttpRequest is often portrayed as being rocket science. But you’ll find that, with a little practice and perhaps a couple new concepts, it’s not as tricky as its reputation suggests.
Starting a Project
If you didn’t create the example Rails skeleton in the last section, do so now, from your system’s ...