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Documenting JavaScript Code with JSDoc
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JavaScript, like many other programming languages, suffers from a basic flaw in the average software developer s psyche: it is often easier to write (or rewrite) a certain piece of functionality than it is to read some existing code and figure out how it works. Properly adding comments to code while writing the code can greatly reduce the amount of time and effort required by other developers to understand how the code works, especially when it comes time to modify the functionality of the code. The Java language was introduced with a tool called javadoc. This tool produces API documentation in HTML format from documentation comments in the source code. Any Web browser can easily read the resulting HTML, and since it s rendered as HTML, it can be distributed online, which provides developers with easy access to it. Providing the API documentation in an easily browsable format often eliminates the need for developers to inspect source code to figure out how a certain class or method behaves and how it should be used. JSDoc is a similar tool for JavaScript (jsdoc.sourceforge.net). JSDoc is an open-source tool that is licensed under the GNU Public License (GPL). JSDoc is written in Perl, meaning that Windows users will have to install a Perl runtime environment. (Perl is a standard part of most Linux and Unix operating systems.)
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CHAPTER 5 I BUILDING THE ULTIMATE AJAX DEVELOPER S TOOLBOX
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To use JSDoc, Windows users must install a Perl environment such as ActivePerl (www.activeperl.com). You must also install a nonstandard Perl module named HTML::Template (www.cpan.org). The JSDoc project page provides instructions and help for those who need further assistance. JSDoc is distributed as a gzipped tarball. To install JSDoc, simply download the tarball from the JSDoc project page and unpack it to the desired directory. You can immediately test JSDoc by going to the JSDoc directory and entering the following command: perl jsdoc.pl test.js JSDoc sends the resulting HTML files to a directory named js_docs_out. Open the index.html file located in this folder to browse the documentation generated from the test.js file.
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Now that you ve gotten this far, you can investigate how to use JSDoc to document your JavaScript code. Table 5-1 outlines the special JSDoc tags that create the HTML documentation. The tags will seem familiar to anyone used to writing javadoc comments in Java code. Each comment block to be included in the generated documentation must start with /** and end with */. Table 5-1. JSDoc Command Attributes
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@param @argument @return @returns @author @deprecated @see @version @requires @throws @exception {@link} @author @fileoverview
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Describes a function parameter by specifying the parameter name and description. Describes the return value of the function. Indicates the author of the code. Indicates that a function is deprecated and may be removed from future versions of the code. You should avoid using this particular piece of code. Creates an HTML link to the description of the specified class. Specifies the release version. Creates an HTML link to the specified class that is required for this class. Describes the type of exception that a function may throw. Creates an HTML link to the specified class. This is similar to @see but can be embedded inside comment text. Indicates the author of the code. A special tag that when used in the first block of documentation in a file, specifies that the rest of the documentation block will be used to provide an overview of the file. Provides information about the class and is used in the constructor s documentation. Indicates the return type of a function.
@class @constructor @type
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CHAPTER 5 I BUILDING THE ULTIMATE AJAX DEVELOPER S TOOLBOX
Command Name
@extends @private
Description
Indicates that a class subclasses another class. JSDoc can often detect this information on its own, but in some instances using this tag is required. Signifies that a class or function is private. Private classes and functions will not be available in the HTML documentation unless JSDoc is run with the --private command-line option. Indicates that a value is a constant value. Keep in mind that JavaScript can t actually enforce a value as being constant. JSDoc ignores functions that are labeled with this tag.
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