+ var data = null;
+
+ if ( typeof key === "undefined" ) {
+ if ( this.length ) {
+ data = jQuery.data( this[0] );
+
+ if ( this[0].nodeType === 1 ) {
+ var attr = this[0].attributes, name;
+ for ( var i = 0, l = attr.length; i < l; i++ ) {
+ name = attr[i].name;
+
+ if ( name.indexOf( "data-" ) === 0 ) {
+ name = name.substr( 5 );
+ dataAttr( this[0], name, data[ name ] );
+ }
+ }
+ }
+ }
+
+ return data;