Pulling relevant scroll jacking functions in

scroll-jack-blocking.js

@@ -0,0 +1,96 @@
+	// Extracted from https://github.com/joshbalfour/disable-scroll-jacking/blob/master/extension/src/inject/injected.js
+  var eventBlacklist = [
+		"mousemove",
+		"scroll",
+		"mousewheel",
+		"DOMMouseScroll",
+		"DomMouseScroll",
+		"MozMousePixelScroll",
+		"wheel",
+		"hashchange"
+	];
+
+	var windowFunctionsToWrap = [
+		"scrollTo",
+		"scroll",
+		"scrollBy"
+	];
+
+	var noProgrammaticScrolling = false;
+
+	function wrapBlacklistedEventsFromElement(ele, $){
+
+		var wrapEventHandler = function(event){
+
+			return function (e){
+				noProgrammaticScrolling = true;
+				event.handler(e);
+				if (!noProgrammaticScrollingEver){
+					noProgrammaticScrolling = false;
+				}
+			};
+
+		};
+
+		var events = $._data( ele, "events" );
+
+		for (var eventName in events){
+			if (eventBlacklist.indexOf(eventName) != -1){
+
+				var newEventHandlers = events[eventName].map(wrapEventHandler);
+				$(ele).off(eventName);
+
+				for (var i in newEventHandlers){
+					$(ele).on(eventName, newEventHandlers[i]);
+				}
+
+			}
+		}
+	}
+
+	function wrap(original){
+		return function(){
+			if (!noProgrammaticScrolling){
+				original.apply(window, arguments);
+			} else {
+				if (debug){
+					console.log("Blocked wrapped function as programmatic scrolling is disabled");
+				}
+			}
+		};
+	}
+
+	function wrapWindowFunction(name){
+		window[name] = wrap(window[name]);
+	}
+
+	function init(settings){
+
+		debug = settings.debug;
+
+		switch (settings.strictness){
+			case "strict":
+				noProgrammaticScrollingEver = true;
+				break;
+			case "medium":
+				break;
+			case "off":
+				enabled = false;
+				break;
+		}
+
+		if (enabled){
+
+			if (typeof jQuery != 'undefined'){
+				var $ = jQuery;
+				$.fn.scrollTo = wrap($.fn.scrollTo);
+				wrapBlacklistedEventsFromElement(window, $);
+				wrapBlacklistedEventsFromElement(document, $);
+				wrapBlacklistedEventsFromElement(document.body, $);
+			}
+
+			windowFunctionsToWrap.forEach(wrapWindowFunction);
+
+		}
+
+	}