#messageResource.js

messageResource.js is a simple JavaScript library for reading message resource property files of following format.

#example.properties

home.title = My Tile
home.welcome = Welcome Message
description = This is a brief description message.

##Basic Usage Clik here to download compressed version of messageResource.js.
OR
Clik here to download uncompressed version of messageResource.js. ####HTML

<!-- Include messageResource.min.js in the html -->
<script src="messageResource.min.js"></script>

####JavaScript

// initialize messageResource.js with settings
messageResource.init({
  // path to directory containing message resource files(.properties files),
  // give empty string or discard this configuration if files are in the
  // same directory as that of html file.
  filePath : 'path/messageresource/'
});

// will load the file 'path/messageresource/moduleName.properties'
// and callbackFunction will be executed when loading is complete.
messageResource.load('moduleName', callbackFunction); 
// file name without extension is taken as module name.

// use messageResource.get function to get values from loaded file. 
var value = messageResource.get('sample.key', 'moduleName');

###Loading files with locale. You can also specify locale while loading a file.

// will load the file moduleName_fr_FR.properties.
messageResource.load('moduleName', callbackFunction, 'fr_FR');

// get value based on locale from moduleName_fr_FR.properties.
var value = messageResource.get('sample.key', 'moduleName', 'fr_FR');

###Specifying current locale. You can specify the current locale to remove locale argument from further function calls.

// set current locale
messageResource.setCurrentLocale('fr_FR');

// will load the file moduleName_fr_FR.properties.
messageResource.load('moduleName', callbackFunction);

// get value from file moduleName_fr_FR.properties.
var value = messageResource.get('sample.key', 'moduleName');

If current locale is not set, then default locale which is en_US will be taken can as the current locale. You can change the default locale from en_US to another locale.

// initialize messageResource.js with defaultLocale in settings
messageResource.init({
  filePath : 'path/messageresource/',
  defaultLocale : 'en_GB'
});

Locale in the file name is not necessary for message resource file corresponding to default locale.

// initialize messageResource.js
messageResource.init({
  filePath : 'path/messageresource/',
  defaultLocale : 'en_GB'
});

// will load moduleName.properties and data will be saved.
// corrsponding to defaultLocale en_GB
messageResource.load('moduleName', callbackFunction);

// both value and valueWithLocale will be same.
var value = messageResource.get('sample.key', 'moduleName');
var valueWithLocale = messageResource.get('sample.key', 'moduleName', 'en_GB');

// set current locale 
messageResource.setCurrentLocale('fr_FR');

// since current locale and default locale are different, the 
// below statement will load the file moduleName_fr_FR.properties.
messageResource.load('moduleName', callbackFunction);

###Specifying different file extension. By default the expected file extension for message resource files is .properties. You can change this default extension using the following configuration while initializing messageResource.js.

// initialize messageResource.js
messageResource.init({
  filePath : 'path/messageresource/',
  fileExtension : 'txt' // changes file extension to .txt
});

Building messageResource.js

1. Ensure that Node.js is installed.
2. Run the following command to install Grunt's command line interface (CLI) globally, which adds grunt command in your system path.

   npm install -g grunt-cli
   

3. Change to the project's root directory.
4. Ensure that package.json and Gruntfile.js are in project's root directory.
5. Install project dependencies with the following command.

   npm install
   

6. Run Grunt with the following command, which builds and places messageResource.js and messageResource.min.js in the dist directory.

   grunt
   

API

messageResource

messageResource variable is added to the global scope.

---

messageResource.init([config])

Initialize messageResource.js with configuration options.

Parameters

config Object : Object with configuration options.

Available configuration options

filePath String : Path(directory) containing message resource files to be loaded. Default value is empty string and it points to the same path as that of html file.
fileExtension String : File extension of message resource files. Default value is .properties.
defaultLocale String : Default locale to be used. Default value is en_US.
fileNameResolver Function : Specify custom file name resolver. Default file name resolver will be used if not specified.
ajaxFunction Function : Specify custom ajax function for loading files. The function should accept only 2 arguments, url/path of the file and callback with response text as argument. Default ajax function will be used if not specified.
debugMode Boolean : Enable or disable debug mode. Default value is false.

---

messageResource.setCurrentLocale(locale)

Set current locale to be used. This configured locale will be used by load and get functions if locale not specified. If current locale is not set then default locale will be used as current locale.

Parameters

locale String : Locale identifier like en_US.

---

messageResource.load([module], [locale], [callback])

Loads a message resource file. The file name is constructed based on the given module name and locale. File name is constructed with default configuration in different cases as follows :

• case 1 : Module name and locale empty or null, then the file name will be _default.properties.
• case 2 : Module name Home and locale empty, then file name will be Home.properties.
• case 3 : Module name empty and locale en_US, then file name will be _default_en_US.properties.
• case 4 : Module name Home and locale en_US, then file name will be Home_en_US.properties.

Parameters

module String | Array : Module name or list of module names to be loaded. By Default it loads module with name _default.
locale String : Locale identifier like en_US. Current locale will be used as default.
callback Function : Callback to be executed after loading message resource.

---

messageResource.get(key, [module], [locale], [defaultValue])

Get value of a property from loaded message resource files.

Parameters

key String : Message resource property key.
module String : Module name. Default value is _default.
locale String : Locale identifier like en_US. Current locale will be used as default.
defaultValue String : Default value to return if entry corresponding to the given key not found. By default the given key will be used as default value.

Returns

String : Message resource property value corresponding to the key. If entry doesn't exist, then default value will be returned.

---

Copyright

Copyright 2014 Suhaib Khan. See MIT-LICENCE for details.