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Available from http://chrispederick.com/work/webdeveloper, the web developer toolbar is one of the most popular extensions for Firefox (see Figure 13-3). It offers a wide range of capabilities, including the ability to control cookies, edit CSS, and highlight various HTML elements. It allows you to easily resize your browser to other monitor sizes, and it also provides shortcuts to other Firefox features, such as source code viewing and page validation.
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Figure 13-3. The Firefox web developer toolbar
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While most of the toolbar s features aren t specific to debugging JavaScript, it includes an icon that becomes highlighted when a script error occurs on a page. This allows you to quickly see whether an error occurred in your script.
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The DOM Inspector
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The DOM is used to represent the structure of an HTML or XML document in tree form. This allows programmers to easily access any element in a document. The DOM inspector (pictured in Figure 13-4) lets you browse this tree structure, allowing you to easily see how the document is constructed. This is a very powerful tool, letting you see the properties of each element in your document. For instance, you can see all CSS properties of a chosen element, including its x and y coordinates on your page, and the order in which CSS styles are applied.
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CHAPTER 13 TESTING AND DEBUGGING
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Figure 13-4. The Firefox-based DOM inspector: a crucial debugging tool when getting into heavy DOM-accessing JavaScript code
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This plug-in is shipped with Firefox, but you must manually choose to install it when you install the browser. We will be looking closer at the DOM in 14.
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LiveHTTPHeaders
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The LiveHTTPHeaders extension (available from http://livehttpheaders.mozdev.org) allows you to watch all the HTTP request and response data as you load pages. Not only does it show the data for the web pages you load, but it also shows all requests for images and other files (such as CSS and JavaScript files). This shows all raw request and response data, including cookies sent and received. This is especially useful for Ajax development, as you can also see the requests and responses caused by the XMLHttpRequest object. This allows you to see if your subrequests were executed correctly. Additionally, you can then easily copy and paste the request URL into your browser to see if the subrequest data is returned correctly.
CHAPTER 13 TESTING AND DEBUGGING
As an example, let s take a look at Google Suggest (located at labs.google.com/ suggest). When you start typing your search query, a list of suggestions are fetched using Ajax and returned so that you can see some possible search terms containing what you have already typed. If you turn on LiveHTTPHeaders and then type Ajax into the search box, you can see the following request executing internally:
http://www.google.com/complete/search hl=en&js=true&qu=ajax GET /complete/search hl=en&js=true&qu=ajax HTTP/1.1 Host: www.google.com User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6 Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain; q=0.8,image/png,*/*;q=0.5 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive HTTP/1.x 200 OK Content-Type: text/html; charset=utf-8 Content-Encoding: gzip Server: Auto-Completion Server Cache-Control: private, x-gzip-ok="" Content-Length: 207 Date: Fri, 25 Aug 2006 02:02:04 GMT
The first line simply shows the full URL to which the request is being sent. The next block of text is what makes up the HTTP request. That is, it is precisely what Firefox is sending to Google to fetch the suggestions for the term Ajax. The final block of text is the response data that Google sends back to Firefox. Note that the response text doesn t include that actual returned data it is only showing the response headers. Similarly, the request block only shows the request headers. If you were submitting a POST form, there would be a bunch of form values submitted that wouldn t be listed in LiveHTTPHeaders. If you enter the request URL directly in your browser (www.google.com/complete/ search hl=en&js=true&qu=ajax), you can see the actual data returned by Google (which in this case is some JavaScript code that is used to populate the suggestion list).
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