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CHAPTER 13 TESTING AND DEBUGGING
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Figure 13-1. The Internet Explorer JavaScript debugger
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After several years of Internet Explorer frustration, I was pleased to learn that Firefox provides a rather effective JavaScript debugging console. When a JavaScript error occurs in Firefox, precise details of the error are logged into its internal JavaScript console. The user can then access this console to see a list of all errors that have occurred in a script s execution. While Internet Explorer enjoys giving you nondescript error messages, the JavaScript console in Firefox (see Figure 13-2) provides a detailed description of the type of error that occurred (error, warning, or message); the details of the error involved; and even the file location it occurred at, along with a line number. While Firefox offers superior JavaScript debugging reporting to Internet Explorer, Internet Explorer testing remains a necessary task, as there are some differing standards in use between the two browsers. As Ajax has the potential to be totally cross-platform, it can help to have a version of all the major browsers at your disposal when testing your applications. Remember that just because something works great in one browser, it doesn t mean that it will work perfectly in all browsers. It is important to know who your core audience is and to ensure that you have code that will work to the advantage of as many of your users as possible (ideally, all of them). When you first open the console (click Tools JavaScript Console), you will notice a few buttons at the top, an area to enter code, and a listing of any errors that have occurred. The buttons at the top mainly provide a means of sorting error messages by type and are pretty self-explanatory. Consider setting the default error reporting level to All (meaning that all logged messages are displayed).
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CHAPTER 13 TESTING AND DEBUGGING
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Figure 13-2. Firefox s JavaScript console
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The error message box will catch everything from CSS issues to JavaScript warnings and errors. Each error generally consists of three pieces. The first piece is displayed in bold and contains a detailed message of what has gone wrong with the script in question. The next piece is a URL of the script in which the error occurred, located beneath the description. The last piece gives the number of the line at which the error occurred; it s located to the right of the other two pieces. Note that the console isn t cleared between script executions, so you may sometimes need to click the Clear button and rerun your script to make sure that only the relevant errors are displayed. If errors were generated by a previous page, they may be still listed in the console if you don t clear them first. By leaving the JavaScript console open at all times, you can quickly and efficiently debug all JavaScript error messages, as well as keep your CSS clean and functioning properly. I really don t know how I would work without this handy little tool, and it is highly recommended that you make use of it during your JavaScript debugging endeavors. However, that is not all that Firefox has to offer, thanks to its ingenious extensions feature.
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CHAPTER 13 TESTING AND DEBUGGING
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One of the best features of the Firefox browser is its ability to be extended by third-party plug-ins, each providing extra functionality not core to the browser. There are a wide range of these extensions available, including a tool to display your local weather, a tool to hide advertising from web sites, and of course, what we are interested in, debugging tools. We will now take a look at some of the most useful tools available to Firefox users to help them develop and debug their HTML, CSS, and JavaScript applications.
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