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var expando = "jQuery" + now(), uuid = 0, windowData = {};
var emptyObject = {};
jQuery.extend({
cache: {},
expando:expando,
data: function( elem, name, data ) {
elem = elem == window ?
windowData :
elem;
var id = elem[ expando ], cache = jQuery.cache, thisCache;
// Handle the case where there's no name immediately
if ( !name && !id ) {
return null;
}
// Compute a unique ID for the element
if ( !id ) {
id = ++uuid;
}
// Avoid generating a new cache unless none exists and we
// want to manipulate it.
if ( cache[ id ] ) {
thisCache = cache[ id ];
} else if ( typeof data === "undefined" ) {
thisCache = emptyObject;
} else {
thisCache = cache[ id ] = {};
}
// Prevent overriding the named cache with undefined values
if ( data !== undefined ) {
elem[ expando ] = id;
thisCache[ name ] = data;
}
return name ? thisCache[ name ] : thisCache;
},
removeData: function( elem, name ) {
elem = elem == window ?
windowData :
elem;
var id = elem[ expando ], cache = jQuery.cache, 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 {
// Clean up the element expando
try {
delete elem[ expando ];
} catch( e ) {
// IE has trouble directly removing the expando
// but it's ok with using removeAttribute
if ( elem.removeAttribute ) {
elem.removeAttribute( expando );
}
}
// Completely remove the data cache
delete cache[ id ];
}
}
});
jQuery.fn.extend({
data: function( key, value ){
if ( typeof key === "undefined" && this.length ) {
return jQuery.data( this[0] );
}
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 );
});
}
},
removeData: function( key ){
return this.each(function(){
jQuery.removeData( this, key );
});
}
});
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