diff --git a/core/modules/filters/x-listops.js b/core/modules/filters/x-listops.js
index dc290a42e..ca04b0e2b 100644
--- a/core/modules/filters/x-listops.js
+++ b/core/modules/filters/x-listops.js
@@ -187,4 +187,19 @@ Extended filter operators to manipulate the current list.
         }, []);
         return set;
     };
+	
+	/*
+	Toggles an item in the current list.
+	*/
+	exports.toggle = function(source, operator) {
+		var results = prepare_results(source),
+			index = results.indexOf(operator.operand);	
+		if(index === -1) {
+			results.push(operator.operand);
+		} else {
+			results.splice(index, 1);
+		}
+		return results;
+	};
+	
 })();