Fixes #8277. Sets data to undefined rather than null when it is not provided in ajax helpers so that it won't revent data set in ajaxSettings from being used. Unit test added.

2 files changed, 18 insertions, 3 deletions

diff --git a/src/ajax.js b/src/ajax.js
index 7ef8dec18..76a2dc812 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -164,7 +164,7 @@ jQuery.fn.extend({
 			if ( jQuery.isFunction( params ) ) {
 				// We assume that it's the callback
 				callback = params;
-				params = null;
+				params = undefined;
 
 			// Otherwise, build a param string
 			} else if ( typeof params === "object" ) {
@@ -256,7 +256,7 @@ jQuery.each( [ "get", "post" ], function( i, method ) {
 		if ( jQuery.isFunction( data ) ) {
 			type = type || callback;
 			callback = data;
-			data = null;
+			data = undefined;
 		}
 
 		return jQuery.ajax({
@@ -272,7 +272,7 @@ jQuery.each( [ "get", "post" ], function( i, method ) {
 jQuery.extend({
 
 	getScript: function( url, callback ) {
-		return jQuery.get( url, null, callback, "script" );
+		return jQuery.get( url, undefined, callback, "script" );
 	},
 
 	getJSON: function( url, data, callback ) {
diff --git a/test/unit/ajax.js b/test/unit/ajax.js
index c9c06111f..80da7f8f8 100644
--- a/test/unit/ajax.js
+++ b/test/unit/ajax.js
@@ -1196,6 +1196,21 @@ test("load(String, String, Function)", function() {
 	});
 });
 
+test("jQuery.get(String, Function) - data in ajaxSettings (#8277)", function() {
+	expect(1);
+	stop();
+	jQuery.ajaxSetup({
+		data: "helloworld"
+	});
+	jQuery.get(url('data/echoQuery.php'), function(data) {
+		ok( /helloworld$/.test( data ), 'Data from ajaxSettings was used');
+		jQuery.ajaxSetup({
+			data: null
+		});
+		start();
+	});
+});
+
 test("jQuery.get(String, Hash, Function) - parse xml and use text() on nodes", function() {
 	expect(2);
 	stop();