Learning Firefox OS Application Development


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By the end, you will be able to develop beautifully designed, fully-fledged, and rigorously tested Firefox OS applications and also share them at the Firefox OS Marketplace. Style and approach This book is an easy-to-grasp workflow with practical examples of real-world applications such as Clickr, Check In!

Each chapter explains the concepts, which are then reinforced as they are demonstrated in an application or a flowchart. Get A Copy. More Details Friend Reviews. To see what your friends thought of this book, please sign up.

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Turn Your Web Application into a Firefox OS App in 5 Minutes

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Trivia About Learning Firefox No trivia or quizzes yet. Welcome back. The manifest. It contains meta information about your application and is used by the OS to learn about the app, its permissions, the different icons, and the launch URL. There are mandatory and optional elements and the OS Simulator does a good check of determining if you have missed out something. If you have, it throws back the errors at you right in the dashboard at the time of adding or refreshing the application. Try out the following: open up your manifest. Try to add or refresh the element, and notice that the simulator is not too happy with what you have done.

It will throw back a validation message. A sample screenshot of the error is shown below:. Manifest errors are common. It is normal to make mistakes here since you might be using a text editor to type in things. Errors could range from XML validation errors to missing out of mandatory parameters, etc.

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Correcting the errors is as simple as rectifying the mistakes in your manifest. A normal development cycle will involve incremental development.

You will develop a screen or functionality, see it work within the simulator and move on to the next one and so on. You need a quick way or refreshing or reloading your application into the OS Simulator.

Learning Firefox OS Application Development by Tanay Pant, Paperback | Barnes & Noble®

All you need to do is make your changes in the WebIDE as you have been doing and then click on the refresh button located at the top. The Simulator will reload and relaunch your application. It will also reload the manifest. When was the last time that you wrote an application that did not have errors or did not involve debugging?

Never… correct?

Building apps for Firefox OS

It is time that you get familiar with the Developer Tools that are shipped within the Firefox Browser itself. While going into the details of the Developer Tools, it is suffice to cover it briefly here. Then, at the very least, you can start putting in console or logging statements to understand and help you debug what could be going on in the application.

In this case we are doing it for the Zipcodes application:. When you click on the wrench, it will open up the Dev Tools window in your browser as shown below and will allow you to monitor your application and easily debug it. Now, when we run the application in the OS Simulator by entering a few ZIP codes and get the result, you will see that network calls are traced.


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Additionally any console. This is very useful for understanding what is happening at different stages in your application. You will notice from the screenshot below that it also shows the line number of the file zipcode.


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If you click on the hyperlink of the filename:linenumber, it will even open up your code at that exact point. Now comes the interesting part. We shall see how to use Developer Tools to help debug the application.

WebIDE - Firefox app development

By debugging an application, we mean not just putting console. Follow the steps below patiently. We will assume that you have launched the ZIP codes application locally and it has come up with its first screen on the OS Simulator. Make sure you have started your Firefox OS App as explained in the earlier section. Go to the Debugger tab as shown below:. You shall see that the index.

Learning Firefox OS Application Development Learning Firefox OS Application Development
Learning Firefox OS Application Development Learning Firefox OS Application Development
Learning Firefox OS Application Development Learning Firefox OS Application Development
Learning Firefox OS Application Development Learning Firefox OS Application Development
Learning Firefox OS Application Development Learning Firefox OS Application Development
Learning Firefox OS Application Development Learning Firefox OS Application Development

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