Added a scroll if check on the scrollTo directive

README.md

@@ -105,6 +105,7 @@ Example:
 <button
 	scroll-to="elem-id5"
 	duration="1800"
+	scroll-if="isTruthy()"
 	callback-before="aFunction(element)"
 	callback-after="anotherFunction">
 	Scroll to next page.
@@ -185,20 +186,20 @@ The offset from the top of the page in which the scroll should stop.
 type: `string`
 default: `easeInOutQuart`
 
-the easing function to be used for this scroll.
+The easing function to be used for this scroll.
 
 #### callbackBefore
 type: `function`
 default: `function(element) {}`
 
-a callback function to run before the scroll has started. It is passed the
+A callback function to run before the scroll has started. It is passed the
 element that will be scrolled to.
 
 #### callbackAfter
 type: `function`
 default: `function(element) {}`
 
-a callback function to run after the scroll has completed. It is passed the
+A callback function to run after the scroll has completed. It is passed the
 element that was scrolled to.
 
 #### containerId
@@ -207,6 +208,12 @@ default: null
 
 ID of the scrollable container which the element is a child of.
 
+#### scrollIf
+type: `function`, `boolean`, `string`, `number`
+default: true
+
+Will allow scrolling if the value passed to scrollIf resolves to a truthy value.
+
 ### Easing functions
 
 The available easing functions are:

lib/angular-smooth-scroll.js

@@ -225,6 +225,7 @@
 			scope: {
 				callbackBefore: '&',
 				callbackAfter: '&',
+				scrollIf: '&'
 			},
 			link: function($scope, $elem, $attrs) {
 				var targetElement;
@@ -252,20 +253,24 @@
 							}
 						}
 					};
-
-					smoothScroll(targetElement, {
-						duration: $attrs.duration,
-						offset: $attrs.offset,
-						easing: $attrs.easing,
-						callbackBefore: callbackBefore,
-						callbackAfter: callbackAfter,
-						containerId: $attrs.containerId
-					});
+
+					var shouldScroll = $attrs.scrollIf ? $scope.scrollIf() : true;
+
+					if(shouldScroll) {
+						smoothScroll(targetElement, {
+							duration: $attrs.duration,
+							offset: $attrs.offset,
+							easing: $attrs.easing,
+							callbackBefore: callbackBefore,
+							callbackAfter: callbackAfter,
+							containerId: $attrs.containerId
+						});
+					}
 
 					return false;
 				});
 			}
 		};
 	}]);
 
-}());
+}());