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CHAPTER 8 CREATING MOBILE WEB APPSSummaryIn this chapter, I created a solid mobile implementation of my CheeseLux web app. I showed you theimportance of adopting the navigation model provided by the mobile toolkit you are using and variousapproaches for integrating the core features of a professional-level web app, such as routing, viewmodels, and data bindings. Mobile widget toolkits usually require some tweaks and tricks to get them toplay nicely with pro web apps, but the result is worth figuring out solutions to the wrinkles that arise. Inthe next chapter, I show you different techniques for improving the way you write and package yourJavaScript code.228www.it-ebooks.info
C H A P T E R 9Writing Better JavaScriptIn this chapter, I explain some of the techniques I use to create better JavaScript. This is not a languageguide, and I won’t be demonstrating any code hacks or tweaks. My coding preferences are yourmaintenance nightmares, and vice versa. I have seen otherwise mild-mannered people end up in ascreaming match over the “right” way to code, and I don’t see the point in lecturing you when I have afair few bad habits myself.Instead, I am going to show you some of the techniques I use to make my code easier for otherprogrammers and projects to use. Most large-scale web apps have a team of programmers, and sharingcode becomes important.I have been dumping useful functions into the utils.js file throughout this book. This is how I tendto work, with a general kitchen-sink file where I put functions that I expect to repeatedly use. For thisbook, using utils.js let me spend more time in each chapter on the topics at hand without having tospend pages listing code that I defined in a previous chapter. It also let me demonstrate the idea of usinga core set of common functions when creating desktop and mobile versions of the same web app.The problem with just dumping functions into a file in this way is that they become hard to manageand maintain and, as I’ll explain shortly, difficult for others to integrate into their projects. For thisreason, I revisit my kitchen-sink file when I have reached a point in a project where the basicfunctionality is stable and I have a good feel for the way that different features fit together. At this point,and not before, I start to rework the code into modules so that it plays nicely with other libraries. In thischapter, I show you the techniques I use for this.Once I have tidied up and modularized the code, I begin unit testing. Testing is a very personalthing, and many testing proselytizers will insist that testing must begin as soon as you start coding, if notsooner. I understand that point of view, but I also know that I don’t even think about testing until I havemade a certain amount of progress with a project. There naturally comes a point where I have enoughprogress and my mind starts to turn toward consolidating and improving what I have.Testing is another topic on which I am not going to lecture. My only advice is that you should behonest with yourself. Test when it feels right, test until you are happy with your code, and use thetechniques and tools that work for you. Do what is right for your project, and accept that testing later willrequire more coding changes and that not testing at all means your users will have to find your bugs foryou.Managing the Global NamespaceOne of the biggest problems with large JavaScript projects is the likelihood of a naming collision, wheretwo regions of code use the same global variable names for different purposes. A global variable is onethat exists outside a function or object. JavaScript makes these available throughout your webapplication so that a global function defined in an inline script element or external JavaScript file is229www.it-ebooks.info
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Contents at a Glance• About the A
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CHAPTER 1 GETTING READYWhat Do You
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CHAPTER 3 ADDING A VIEW MODELCreat
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C H A P T E R 4Using URL RoutingIn
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C H A P T E R 5Creating Offline Web
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CHAPTER 5 CREATING OFFLINE WEB APP
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C H A P T E R 6Storing Data in the
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C H A P T E R 7Creating Responsive
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