Dojo Modules and Features in Java

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Dojo is organized into modules that contain groups of related functions A module consists of a JavaScript file with the functions defined within itThe file also contains some special Dojo functions that register the module with Dojo Every Dojo module used by a page must be registered when that page runs So you ll see the following code repeated many times within the Dojo source code (although the specific module being registered will be different)
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Technical Description of Dojo
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if(!dojo_hasResource["dojo_baseColor"]) dojo_hasResource["dojo_baseColor"] = true; dojoprovide("dojo_baseColor");
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The preceding code construct appears at the top of every module file and tells Dojo that a module has been loaded In this case the loaded module is dojo_baseColor This would correspond to a JavaScript file called Colorjs in the directory _base under the dojo subdirectory A module may have one or many functions within it Functions do not require registration individually Sometimes the module name and the name of the function are the same, but this is not requiredThe full name of a function is derived from the module name plus the function name For example, the function fromISOString in the module dojodatestamp would be called in your code as shown in the following example:
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var date = dojodatestampfromISOString()
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1131 Naming Conventions and Name Space
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It is probably useful to talk about a few naming conventions at this point Dojo functions are named with a multi-part conventionThe first part of the name is always dojoThis designates that the function is part of Dojo and not a custom function created by you or a function from another class libraryThe advantage of using a separate name space for Dojo is that it is always clear when reading your code which functions are yours and which functions belong to Dojo Furthermore, functions you write will not conflict with those from Dojo The next part of the name is the module and is preceded by a dot For example, _base designates that this function is part of the base moduleThe module name may be followed by another dot and a sub-module name to further group functions Otherwise the third part will be the function or constructor name A constructor name would be capitalized A lowercase name tells us it is a method or non-constructor function Function names follow the Camel Case convention, which is a technique for creating names from multi-word descriptions where the words are concatenated together without spaces or special characters, and the leading letter of each word is lowercase (except for constructors where the first letter would be capitalized) For example, a method that calculates shipping charges might be called calcShipCharge, using the Camel Case naming convention Sometimes, for frequently used functions, a short-cut name is assigned to the function that omits the module Remember, Dojo functions are named with the following conventions: The first part is always dojo The second part is the module name The third part is the function, constructor, or sub-module name
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If the third part of the name is a sub-module, then the fourth part will be the function or constructor name
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A final note on names:When a leading underscore character is used in a function name, such as with dojoparser_nameAnonFunc, the underscore marks the function as being one that a developer using Dojo would not use directlyThe function would be used internally within the Dojo code In essence, the underscore makes the function private
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1132 Dojo Base Module
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Now that we ve introduced dojojs and talked about the base features in it without detailing them, let s see what kinds of functions are actually included James Burke provided an excellent summary of the Dojo base functions in the Dojo forum1 And although his description is nearly perfect, I m going to provide my own summary of it also As we review the modules included in Dojo base, I ll just provide a summary description Many of these functions will be reviewed in more detail in later chapters The term API is used frequently throughout this bookThe term is an acronym for Application Program Interface and usually refers to the set of public functions available for a library and the exact parameters required to call those functions Obviously, the exact Dojo API is extremely important in using Dojo For many functions, detail on the API is included, but you should be aware that sometimes the API changes or alternate variations in the API for a particular function are available An extremely important and useful resource to use for understanding the API and identifying variations and changes is the API documentation available on the Dojo site2 You ll notice that in the function names for the functions in base that the second part of the name, the module, is missingThis is done as a convenience so that the function names are shorter in your code and yet still long enough to be meaningful Let s start with one of the simplest modules first and then advance to the more complex ones 11321 The dojolang Module This module consists of a number of general functions used in many different contexts The module name stands for language and is similar in purpose to the javalang package that may be familiar to Java programmersThink of them as foundational functions that can be used by other Dojo functions (and available to you in your custom JavaScript, of course)
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1 Following is the link to James Burke s summary of the base module features in dojojs, http://dojotoolkitorg/2007/08/22/dissecting-0-9s-dojo-js 2 Following is the link to the online Dojo API documentation Be aware that this link may be changed in the future, and you may need to search the site to find it (http://dojotoolkitorg/api)
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