Objects with length properties weren't getting serialized properly by jQuery.param(). Fixes #5862.

src/ajax.js

@@ -603,7 +603,6 @@ jQuery.extend({
 	// Serialize an array of form elements or a set of
 	// key/values into a query string
 	param: function( a, traditional ) {
-		
 		var s = [];
 		
 		// Set traditional to true for jQuery <= 1.3.2 behavior.
@@ -611,12 +610,6 @@ jQuery.extend({
 			traditional = jQuery.ajaxSettings.traditional;
 		}
 		
-		function add( key, value ) {
-			// If value is a function, invoke it and return its value
-			value = jQuery.isFunction(value) ? value() : value;
-			s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
-		}
-		
 		// If an array was passed in, assume that it is an array of form elements.
 		if ( jQuery.isArray(a) || a.jquery ) {
 			// Serialize the form elements
@@ -627,8 +620,15 @@ jQuery.extend({
 		} else {
 			// If traditional, encode the "old" way (the way 1.3.2 or older
 			// did it), otherwise encode params recursively.
-			jQuery.each( a, function buildParams( prefix, obj ) {
+			for ( var prefix in a ) {
+				buildParams( prefix, a[prefix] );
+			}
+		}
 
+		// Return the resulting serialization
+		return s.join("&").replace(r20, "+");
+
+		function buildParams( prefix, obj ) {
 			if ( jQuery.isArray(obj) ) {
 				// Serialize array item.
 				jQuery.each( obj, function( i, v ) {
@@ -657,11 +657,12 @@ jQuery.extend({
 				// Serialize scalar item.
 				add( prefix, obj );
 			}
-			});
 		}
 
-		// Return the resulting serialization
-		return s.join("&").replace(r20, "+");
+		function add( key, value ) {
+			// If value is a function, invoke it and return its value
+			value = jQuery.isFunction(value) ? value() : value;
+			s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
+		}
 	}
-
 });

test/unit/ajax.js

@@ -979,6 +979,19 @@ test("jQuery.getJSON(String, Function) - JSON object with absolute url to local
 	});
 });
 
+test("jQuery.post - data", function() {
+	expect(2);
+	stop();
+
+	jQuery.post(url("data/name.php"), {xml: "5-2", length: 3}, function(xml){
+		jQuery('math', xml).each(function() {
+			equals( jQuery('calculation', this).text(), '5-2', 'Check for XML' );
+			equals( jQuery('result', this).text(), '3', 'Check for XML' );
+		});
+		start();
+	});
+});
+
 test("jQuery.post(String, Hash, Function) - simple with xml", function() {
 	expect(4);
 	stop();