iPhone and iPod Touch Programming

This Wrox Blox explains touch input events and illustrates how to
detect an orientation change, capture two-finger scrolling inputs,
and simulate a drag-and-drop action when designing applications for
the iPhone and iPod Touch. Web developers designing applications
for Mobile Safari, the browser on iPhone and iPod Touch, are able
to easily incorporate touch input event handling without writing
any code at all. However, while page flicking and scrolling are
easy to implement, Mobile Safari does not provide a way to trap or
override most touch interactions, nor does it allow developers full
access to all DOM events.

Perhaps the most important event handling constraint is that no
events trigger until the user's finger leaves the touch
screen. However, because developers are able to trap for viewport
orientation changes, they do have full programmatic control over
their application when the orientation changes between portrait and
landscape modes. As a result, you can adjust CSS styling and
positioning based on the current mode.

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