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Here are a few pointers about previewing music: Previews are 30 seconds long and generally start playback 30 seconds into the song. If a song is shorter than 30 seconds, it plays back for as long as it can. For example, search for Monty Python s Spam song. Select it, and its preview plays back the entire track. The dark pie wedge shows how much of the preview has played. The wedge grows over time until the preview has finished and the wedge is a complete dark circle. The Stop button in the center of the control allows you to stop playback. You cannot pause and resume playback. Playback always starts at the same point. To purchase music, tap the price to the right of the track name. The button expands, turns green, and changes from the price to BUY NOW. Tap a second time to confirm that you really do want to buy the selection. In a delightful animation, your new song jumps directly into the Downloads icon at the bottom of the screen. If you haven t recently entered your password, the music store app prompts you to do so by opening a little dialog alert. Type in your password and tap OK. Pay special care while typing, because you will not be able to see the text. It appears as a series of dots instead to protect your security. Once you ve entered the proper password and tapped OK, your download begins.

The object literal {} represents a sort of empty object. We ll discuss the various JavaScript literals in detail in section 3.1.7. Once you ve created an object, you can take advantage of an important characteristic of the language: You can expand objects at any time by adding new properties to them. This is different from what happens in class-based languages such as C# and VB.NET, where the structure of an object is specified in a class and instances can t be modified at runtime. To add a property to an object, you need to access it and assign a value. You can do this anywhere in the code, at any time. If the property doesn t exist, it s automatically created at runtime. The following code shows how to add a property called title to the book object you created before:

Summary

The Downloads screen (see Figure 7-7) tracks the download progress for your recent purchases. Once you ve completely downloaded a track, it disappears from this screen and adds itself to your iPod s library.

In this chapter, you took what you learned in s 7 and 8 and brought it to the next level by looking at some of the more advanced areas of CouchDB views. You learned how to do all sorts of aggregation, filter and sort your results, and store relational data in a CouchDB database. That concludes Part 2 of the book. In Part 3, you will see how to put all of this together to create CouchDB applications using CouchApp, and you will see how you can use a CouchDB database as the back end to applications created in Python, and Ruby.

book.title = 'ASP.NET AJAX In Action';

Figure 7-7. The Downloads screen allows you to track progress as newly purchased tracks arrive on your iPod touch. The red bubble on the Downloads button indicates the number of tracks left to download.

In this part, you will take the knowledge you gained in the previous parts of this book and apply them in a series of applications. First, you will create a full client-side web application using CouchApp. Then, you will learn how to connect to CouchDB from your Python and Ruby applications, before creating a sample application in Python using the Django web framework and the Couchdbkit library. Finally, you will explore some more advanced areas of CouchDB such as replication, compaction, load balancing, security, and more.

s As of the January 1.1.3 iPod touch update, you can redeem gift certificates on your iPod touch. On Tip

As we said previously, objects in JavaScript are collections of name and value pairs. To demonstrate, you can add a property to an object using an indexed notation, as if you were accessing a collection such as an array or a hash table. The following is another way to add a title property to the book object: