Implements joined jQuery.when statements. Makes it so calling jQuery.when with no...

[jquery.git] / src / core.js

diff --git a/src/core.js b/src/core.js
index 0bf0cb4..25ef22d 100644 (file)
--- a/src/core.js
+++ b/src/core.js
@@ -898,9 +898,10 @@ jQuery.extend({
        Deferred: function( func ) {
 
                var deferred = jQuery._Deferred(),
-                       failDeferred = jQuery._Deferred();
+                       failDeferred = jQuery._Deferred(),
+                       promise;
 
-               // Add errorDeferred methods and redefine cancel
+               // Add errorDeferred methods, then and promise
                jQuery.extend( deferred , {
 
                        then: function( doneCallbacks , failCallbacks ) {
@@ -914,13 +915,15 @@ jQuery.extend({
                        // Get a promise for this deferred
                        // If obj is provided, the promise aspect is added to the object
                        promise: function( obj ) {
-                               obj = obj || {};
-                               jQuery.each( "then done fail isResolved isRejected".split( " " ) , function( _ , method ) {
+                               if ( obj == null ) {
+                                       if ( promise ) {
+                                               return promise;
+                                       }
+                                       promise = obj = {};
+                               }
+                               jQuery.each( "then done fail isResolved isRejected promise".split( " " ) , function( _ , method ) {
                                        obj[ method ] = deferred[ method ];
                                });
-                               obj.promise = function() {
-                                       return obj;
-                               };
                                return obj;
                        }
 
@@ -942,10 +945,32 @@ jQuery.extend({
 
        // Deferred helper
        when: function( object ) {
-               object = object && jQuery.isFunction( object.promise ) ?
-                       object :
-                       jQuery.Deferred().resolve( object );
-               return object.promise();
+               var args = arguments,
+                       length = args.length,
+                       deferred = length <= 1 && object && jQuery.isFunction( object.promise ) ?
+                               object :
+                               jQuery.Deferred(),
+                       promise = deferred.promise(),
+                       resolveArray;
+
+               if ( length > 1 ) {
+                       resolveArray = new Array( length );
+                       jQuery.each( args, function( index, element, args ) {
+                               jQuery.when( element ).done( function( value ) {
+                                       args = arguments;
+                                       resolveArray[ index ] = args.length > 1 ? slice.call( args , 0 ) : value;
+                                       if( ! --length ) {
+                                               deferred.fire( promise, resolveArray );
+                                       }
+                               }).fail( function() {
+                                       deferred.fireReject( promise, arguments );
+                               });
+                               return !deferred.isRejected();
+                       });
+               } else if ( deferred !== object ) {
+                       deferred.resolve( object );
+               }
+               return promise;
        },
 
        // Use of jQuery.browser is frowned upon.