Developing Hybrid Applications for the iPhone: Using HTML, by Lee Barney

By Lee Barney

“For these now not able to take on the complexities of Objective-C, it is a wonderful means to start construction iPhone apps. in the event you understand the fundamentals of HTML, JavaScript, and CSS, you’ll be construction apps in no time.” —August Trometer, proprietor of FoggyNoggin software program,   notice the better, swifter approach to construct top of the range iPhone functions   Now, you don’t have to dive headfirst into Objective-C to jot down cutting-edge purposes for the iPhone. you should use internet improvement instruments and applied sciences you recognize: JavaScript, HTML, and CSS. during this booklet, long-time internet and cellular program developer Lee S. Barney indicates you ways to take advantage of the QuickConnect and PhoneGap frameworks to create safe, fine quality, modular hybrid iPhone functions.   Lee S. Barney walks you thru the total hybrid iPhone improvement strategy, from developing nice person interfaces to compiling, deploying, and executing functions. alongside the way in which, he introduces concepts and pattern code designed to streamline improvement, do away with complexity, optimize functionality, and leverage all iPhone’s local capabilities—from its accelerometer and GPS to its integrated database. insurance contains   utilizing Dashcode and Xcode jointly to create special, fascinating hybrid iPhone functions utilizing the QuickConnect JavaScript API to accomplish initiatives starting from vibrating the telephone to having access to the accelerometer and GPS position info gaining access to local iPhone performance utilizing the PhoneGap JavaScript API Storing, retrieving, and handling information at the iPhone, even with out community entry utilizing XMLHttpRequest to entry or synchronize distant information and use internet companies developing Google-based maps on your personal app that paintings like these you notice within the iPhone’s Maps program   This publication systematically lowers the boundaries to iPhone improvement, permitting net builders to construct any iPhone program they could think with out lengthy improvement cycles or steep studying curves!

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Line 8 of the previous code sends aWebView a message stating that the current QuickConnectViewController, known as self, acts as the aWebView object’s delegate. 1 indicates what these methods are. The template has already added webView:shouldStartLoadWithRequest, webView:DidStartLoad, webView:DidFinishLoad, and webView:didFailLoadWithError. Thankfully, as seen in lines 3 and 4 of the code snippet, the NSBundle class that represents your application on disk has a method called pathForResource:ofType.

They might involve behavior such as making changes to stored data or be as simple as the following entryECF example. innerHTML = message; } 33 34 Chapter 2 JavaScript Modularity and iPhone Applications Because of its simplicity, this ECF can be used in the case of validation failures in both ValCFs in this example application. The next section shows an implementation of a front controller and application controllers. Section 3: The QuickConnectiPhone Implementation of the Modular Design The handleRequest function, like most other portions of the design implementation in this section, is small.

2. This function attempts to execute any string as if it contains valid JavaScript code. ” When this string is passed to eval, the result returned is 15. Be careful when using the eval function because it executes any string it is given. In the simpleCalc example application, it is safe to use because the ValCF that ensures that both the a and b values are numbers has been passed. If validation hasn’t been done on the elements used in a call to eval, users can discover the internals of an application and perform nefarious acts, such as an SQL insertion attack if the BCF has database access.

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