jquery/src/data.js

var windowData = {};

jQuery.extend({
	cache: {},

	// Please use with caution
	uuid: 0,

	// Unique for each copy of jQuery on the page	
	expando: "jQuery" + jQuery.now(),

	// The following elements throw uncatchable exceptions if you
	// attempt to add expando properties to them.
	noData: {
		"embed": true,
		"object": true,
		"applet": true
	},

	data: function( elem, name, data ) {
		if ( elem.nodeName && jQuery.noData[elem.nodeName.toLowerCase()] ) {
			return;
		}

		elem = elem == window ?
			windowData :
			elem;

		var id = elem[ jQuery.expando ], cache = jQuery.cache, thisCache,
			isNode = elem.nodeType;

		if ( !id && typeof name === "string" && data === undefined ) {
			return;
		}

		// Get the data from the object directly
		if ( !isNode ) {
			cache = elem;
			id = jQuery.expando;

		// Compute a unique ID for the element
		} else if ( !id ) {
			elem[ jQuery.expando ] = id = ++jQuery.uuid;
		}

		// Avoid generating a new cache unless none exists and we
		// want to manipulate it.
		if ( typeof name === "object" ) {
			if ( isNode ) {
				cache[ id ] = jQuery.extend(true, {}, name);
			} else {
				cache[ id ] = function() {
					return jQuery.extend(true, {}, name);
				}
			}

		} else if ( !cache[ id ] ) {
			if ( isNode ) {
				cache[ id ] = {};
			} else {
				var store = {};
				cache[ id ] = function() {
					return store;
				}
			}
			
		}

		thisCache = cache[ id ];
		if ( !isNode ) {
			thisCache = thisCache();
		}

		// Prevent overriding the named cache with undefined values
		if ( data !== undefined ) {
			thisCache[ name ] = data;
		}

		return typeof name === "string" ? thisCache[ name ] : thisCache;
	},

	removeData: function( elem, name ) {
		if ( elem.nodeName && jQuery.noData[elem.nodeName.toLowerCase()] ) {
			return;
		}

		elem = elem == window ?
			windowData :
			elem;

		var isNode = elem.nodeType,
			id = elem[ jQuery.expando ], cache = jQuery.cache;
		if ( id && !isNode ) {
			id = id();
		}
		var thisCache = cache[ id ];

		// If we want to remove a specific section of the element's data
		if ( name ) {
			if ( thisCache ) {
				// Remove the section of cache data
				delete thisCache[ name ];

				// If we've removed all the data, remove the element's cache
				if ( jQuery.isEmptyObject(thisCache) ) {
					jQuery.removeData( elem );
				}
			}

		// Otherwise, we want to remove all of the element's data
		} else {
			if ( jQuery.support.deleteExpando || !isNode ) {
				delete elem[ jQuery.expando ];

			} else if ( elem.removeAttribute ) {
				elem.removeAttribute( jQuery.expando );
			}

			// Completely remove the data cache
			if ( isNode ) {
				delete cache[ id ];
			}
		}
	}
});

jQuery.fn.extend({
	data: function( key, value ) {
		if ( typeof key === "undefined" && this.length ) {
			return jQuery.data( this[0] );

		} else if ( typeof key === "object" ) {
			return this.each(function() {
				jQuery.data( this, key );
			});
		}

		var parts = key.split(".");
		parts[1] = parts[1] ? "." + parts[1] : "";

		if ( value === undefined ) {
			var data = this.triggerHandler("getData" + parts[1] + "!", [parts[0]]);

			if ( data === undefined && this.length ) {
				data = jQuery.data( this[0], key );
			}
			return data === undefined && parts[1] ?
				this.data( parts[0] ) :
				data;
		} else {
			return this.trigger("setData" + parts[1] + "!", [parts[0], value]).each(function() {
				jQuery.data( this, key, value );
				jQuery.event.trigger( "changeData" + parts[1] + "!", [parts[0], value], this );
			});
		}
	},

	removeData: function( key ) {
		return this.each(function() {
			jQuery.removeData( this, key );
		});
	}
});