jquery ajax: support for dynamic data arguments, see #2806; added test/data/echoQuery.php for easier testing of sent query strings

src/ajax.js

@@ -489,7 +489,7 @@ jQuery.extend({
 						s.push( encodeURIComponent(j) + "=" + encodeURIComponent( this ) );
 					});
 				else
-					s.push( encodeURIComponent(j) + "=" + encodeURIComponent( a[j] ) );
+					s.push( encodeURIComponent(j) + "=" + encodeURIComponent( jQuery.isFunction(a[j]) ? a[j]() : a[j] ) );
 
 		// Return the resulting serialization
 		return s.join("&").replace(/%20/g, "+");

test/data/echoQuery.php

@@ -0,0 +1 @@
+<?php echo $_SERVER['QUERY_STRING']; ?>

test/unit/ajax.js

@@ -811,6 +811,22 @@ test("custom timeout does not set error message when timeout occurs, see #970",
 	});
 });
 
+test("data option: evaluate function values (#2806)", function() {
+	stop();
+	$.ajax({
+		url: "data/echoQuery.php",
+		data: {
+			key: function() {
+				return "value";
+			}
+		},
+		success: function(result) {
+			equals( result, "key=value" );
+			start();
+		}
+	})
+});
+
 }
 
 //}