/**
* The YAHOO object is the single global object used by YUI Library. It
* contains utility function for setting up namespaces, inheritance, and
* logging. YAHOO.util, YAHOO.widget, and YAHOO.example are namespaces
* created automatically for and used by the library.
* @module yahoo
* @title YAHOO Global
*/
/**
* YAHOO_config is not included part of the library. Instead it is an object
* that can be defined by the implementer immediately before including the
* YUI library. The properties included in this object will be used to
* configure global properties needed as soon as the library begins to load.
* @class YAHOO_config
* @static
*/
/**
* A reference to a function that will be executed every time a YAHOO module
* is loaded. As parameter, this function will receive the version
* information for the module. See <a href="YAHOO.env.html#getVersion">
* YAHOO.env.getVersion</a> for the description of the version data structure.
* @property listener
* @static
*/
if (typeof YAHOO == "undefined") {
/**
* The YAHOO global namespace object. If YAHOO is already defined, the
* existing YAHOO object will not be overwritten so that defined
* namespaces are preserved.
* @class YAHOO
* @static
*/
var YAHOO = {};
}
/**
* Returns the namespace specified and creates it if it doesn't exist
* <pre>
* YAHOO.namespace("property.package");
* YAHOO.namespace("YAHOO.property.package");
* </pre>
* Either of the above would create YAHOO.property, then
* YAHOO.property.package
*
* Be careful when naming packages. Reserved words may work in some browsers
* and not others. For instance, the following will fail in Safari:
* <pre>
* YAHOO.namespace("really.long.nested.namespace");
* </pre>
* This fails because "long" is a future reserved word in ECMAScript
*
* @method namespace
* @static
* @param {String*} arguments 1-n namespaces to create
* @return {Object} A reference to the last namespace object created
*/
YAHOO.namespace = function() {
var a=arguments, o=null, i, j, d;
for (i=0; i<a.length; i=i+1) {
d=a[i].split(".");
o=YAHOO;
// YAHOO is implied, so it is ignored if it is included
for (j=(d[0] == "YAHOO") ? 1 : 0; j<d.length; j=j+1) {
o[d[j]]=o[d[j]] || {};
o=o[d[j]];
}
}
return o;
};
/**
* Uses YAHOO.widget.Logger to output a log message, if the widget is
* available.
*
* @method log
* @static
* @param {String} msg The message to log.
* @param {String} cat The log category for the message. Default
* categories are "info", "warn", "error", time".
* Custom categories can be used as well. (opt)
* @param {String} src The source of the the message (opt)
* @return {Boolean} True if the log operation was successful.
*/
YAHOO.log = function(msg, cat, src) {
var l=YAHOO.widget.Logger;
if(l && l.log) {
return l.log(msg, cat, src);
} else {
return false;
}
};
/**
* Initializes the global by creating the default namespaces and applying
* any new configuration information that is detected.
* @method init
* @static
*/
YAHOO.init = function() {
this.namespace("util", "widget", "example");
if (typeof YAHOO_config != "undefined") {
var l=YAHOO_config.listener,ls=YAHOO.env.listeners,unique=true,i;
if (l) {
// if YAHOO is loaded multiple times we need to check to see if
// this is a new config object. If it is, add the new component
// load listener to the stack
for (i=0;i<ls.length;i=i+1) {
if (ls[i]==l) {
unique=false;
break;
}
}
if (unique) {
ls.push(l);
}
}
}
};
/**
* Registers a module with the YAHOO object
* @method register
* @static
* @param {String} name the name of the module (event, slider, etc)
* @param {Function} mainClass a reference to class in the module. This
* class will be tagged with the version info
* so that it will be possible to identify the
* version that is in use when multiple versions
* have loaded
* @param {Object} data metadata object for the module. Currently it
* is expected to contain a "version" property
* and a "build" property at minimum.
*/
YAHOO.register = function(name, mainClass, data) {
var mods = YAHOO.env.modules;
if (!mods[name]) {
mods[name] = { versions:[], builds:[] };
}
var m=mods[name],v=data.version,b=data.build,ls=YAHOO.env.listeners;
m.name = name;
m.version = v;
m.build = b;
m.versions.push(v);
m.builds.push(b);
m.mainClass = mainClass;
// fire the module load listeners
for (var i=0;i<ls.length;i=i+1) {
ls[i](m);
}
// label the main class
if (mainClass) {
mainClass.VERSION = v;
mainClass.BUILD = b;
} else {
YAHOO.log("mainClass is undefined for module " + name, "warn");
}
};
/**
* YAHOO.env is used to keep track of what is known about the YUI library and
* the browsing environment
* @class YAHOO.env
* @type Object
* @static
*/
YAHOO.env = YAHOO.env || {
/**
* Keeps the version info for all YUI modules that have reported themselves
* @property modules
* @type Object[]
*/
modules: [],
/**
* List of functions that should be executed every time a YUI module
* reports itself.
* @property listeners
* @type Function[]
*/
listeners: [],
/**
* Returns the version data for the specified module:
* <dl>
* <dt>name:</dt> <dd>The name of the module</dd>
* <dt>version:</dt> <dd>The version in use</dd>
* <dt>build:</dt> <dd>The build number in use</dd>
* <dt>versions:</dt> <dd>All versions that were registered</dd>
* <dt>builds:</dt> <dd>All builds that were registered.</dd>
* <dt>mainClass:</dt> <dd>An object that was was stamped with the
* current version and build. If
* mainClass.VERSION != version or mainClass.BUILD != build,
* multiple versions of pieces of the library have been
* loaded, potentially causing issues.</dd>
* </dl>
*
* @method getVersion
* @static
* @param {String} name the name of the module (event, slider, etc)
* @return {Object} The version info
*/
getVersion: function(name) {
return YAHOO.env.modules[name] || null;
}
};
/**
* Provides the language utilites and extensions used by the library
* @class YAHOO.lang
*/
YAHOO.lang = {
/**
* Determines whether or not the provided object is an array
* @method isArray
* @param {any} obj The object being testing
* @return Boolean
*/
isArray: function(obj) { // frames lose type, so test constructor string
if (obj.constructor && obj.constructor.toString().indexOf('Array') > -1) {
return true;
} else {
return YAHOO.lang.isObject(obj) && obj.constructor == Array;
}
},
/**
* Determines whether or not the provided object is a boolean
* @method isBoolean
* @param {any} obj The object being testing
* @return Boolean
*/
isBoolean: function(obj) {
return typeof obj == 'boolean';
},
/**
* Determines whether or not the provided object is a function
* @method isFunction
* @param {any} obj The object being testing
* @return Boolean
*/
isFunction: function(obj) {
return typeof obj == 'function';
},
/**
* Determines whether or not the provided object is null
* @method isNull
* @param {any} obj The object being testing
* @return Boolean
*/
isNull: function(obj) {
return obj === null;
},
/**
* Determines whether or not the provided object is a legal number
* @method isNumber
* @param {any} obj The object being testing
* @return Boolean
*/
isNumber: function(obj) {
return typeof obj == 'number' && isFinite(obj);
},
/**
* Determines whether or not the provided object is of type object
* or function
* @method isObject
* @param {any} obj The object being testing
* @return Boolean
*/
isObject: function(obj) {
return typeof obj == 'object' || YAHOO.lang.isFunction(obj);
},
/**
* Determines whether or not the provided object is a string
* @method isString
* @param {any} obj The object being testing
* @return Boolean
*/
isString: function(obj) {
return typeof obj == 'string';
},
/**
* Determines whether or not the provided object is undefined
* @method isUndefined
* @param {any} obj The object being testing
* @return Boolean
*/
isUndefined: function(obj) {
return typeof obj == 'undefined';
},
/**
* Determines whether or not the property was added
* to the object instance. Returns false if the property is not present
* in the object, or was inherited from the prototype.
* This abstraction is provided to enable hasOwnProperty for Safari 1.3.x.
* There is a discrepancy between YAHOO.lang.hasOwnProperty and
* Object.prototype.hasOwnProperty when the property is a primitive added to
* both the instance AND prototype with the same value:
* <pre>
* var A = function() {};
* A.prototype.foo = 'foo';
* var a = new A();
* a.foo = 'foo';
* alert(a.hasOwnProperty('foo')); // true
* alert(YAHOO.lang.hasOwnProperty(a, 'foo')); // false when using fallback
* </pre>
* @method hasOwnProperty
* @param {any} obj The object being testing
* @return Boolean
*/
hasOwnProperty: function(obj, prop) {
if (Object.prototype.hasOwnProperty) {
return obj.hasOwnProperty(prop);
}
return !YAHOO.lang.isUndefined(obj[prop]) &&
obj.constructor.prototype[prop] !== obj[prop];
},
/**
* Utility to set up the prototype, constructor and superclass properties to
* support an inheritance strategy that can chain constructors and methods.
*
* @method extend
* @static
* @param {Function} subc the object to modify
* @param {Function} superc the object to inherit
* @param {Object} overrides additional properties/methods to add to the
* subclass prototype. These will override the
* matching items obtained from the superclass
* if present.
*/
extend: function(subc, superc, overrides) {
var F = function() {};
F.prototype=superc.prototype;
subc.prototype=new F();
subc.prototype.constructor=subc;
subc.superclass=superc.prototype;
if (superc.prototype.constructor == Object.prototype.constructor) {
superc.prototype.constructor=superc;
}
if (overrides) {
for (var i in overrides) {
subc.prototype[i]=overrides[i];
}
}
},
/**
* Applies all prototype properties in the supplier to the receiver if the
* receiver does not have these properties yet. Optionally, one or more
* methods/properties can be specified (as additional parameters). This
* option will overwrite the property if receiver has it already.
*
* @method augment
* @static
* @param {Function} r the object to receive the augmentation
* @param {Function} s the object that supplies the properties to augment
* @param {String*} arguments zero or more properties methods to augment the
* receiver with. If none specified, everything
* in the supplier will be used unless it would
* overwrite an existing property in the receiver
*/
augment: function(r, s) {
var rp=r.prototype, sp=s.prototype, a=arguments, i, p;
if (a[2]) {
for (i=2; i<a.length; i=i+1) {
rp[a[i]] = sp[a[i]];
}
} else {
for (p in sp) {
if (!rp[p]) {
rp[p] = sp[p];
}
}
}
}
};
YAHOO.init();
/*
* An alias for <a href="YAHOO.lang.html">YAHOO.lang</a>
* @class YAHOO.util.Lang
*/
YAHOO.util.Lang = YAHOO.lang;
/**
* An alias for <a href="YAHOO.lang.html#augment">YAHOO.lang.augment</a>
* @for YAHOO
* @method augment
* @static
* @param {Function} r the object to receive the augmentation
* @param {Function} s the object that supplies the properties to augment
* @param {String*} arguments zero or more properties methods to augment the
* receiver with. If none specified, everything
* in the supplier will be used unless it would
* overwrite an existing property in the receiver
*/
YAHOO.augment = YAHOO.lang.augment;
/**
* An alias for <a href="YAHOO.lang.html#extend">YAHOO.lang.extend</a>
* @method extend
* @static
* @param {Function} subc the object to modify
* @param {Function} superc the object to inherit
* @param {Object} overrides additional properties/methods to add to the
* subclass prototype. These will override the
* matching items obtained from the superclass
* if present.
*/
YAHOO.extend = YAHOO.lang.extend;