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Additional info for Building iPhone Apps with HTML, CSS, and JavaScript: Making App Store Apps Without Objective-C or Cocoa

Sample text

By adding this line, we ensure that the code only executes when the user is browsing the page with an iPhone or some other similarly sized device. ” on page 13, the if statement here will fail if your browser’s window width is too large. scrollTo(0,0);resizeTo(320,480); You can even increase the height measurement to make a tall skinny view which is sometimes helpful if you are working with a lot of content (Figure 2-10, shown later). Here we have the so-called “document ready” function. If you are new to jQuery, this can be a bit intimidating, and I admit that it took me a while to memorize the syntax.

In a desktop browser, this would be a simple process; you’d just add a declaration to your CSS using the :active pseudoclass to specify an alternate style for the object that was clicked. I don’t know whether it’s a bug or a feature, but this approach does not work on the iPhone; the :active style is ignored. I toyed around with combinations of :active and :hover, which brought me some success with non-Ajax apps. , the button appears to remain “clicked” even after the finger is removed). Fortunately, the fix is pretty simple.

In other words, you have to do a lot of work to make a sweet Ajax app. Even so, there are some very good reasons to go to the trouble. In particular, it opens the door to creating iPhone apps that can run fullscreen (“Full Screen Mode” on page 48) and even offline (Chapter 6). html that will sit in front of all of the site’s other pages and will handle requests, sort of like a traffic cop. Here’s how it works. html will present the user with a nicely formatted version of the site navigation. I’ll then use jQuery to “hijack” the 29 onclick actions of the nav links so that when the user clicks on one, the browser page will not navigate to the target link.

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