Extend tm-scroll to accept CSS selector to identify the target

core/modules/widgets/scrollable.js

@@ -58,7 +58,11 @@ ScrollableWidget.prototype.handleScrollEvent = function(event) {
 	if(this.outerDomNode.scrollWidth <= this.outerDomNode.offsetWidth && this.outerDomNode.scrollHeight <= this.outerDomNode.offsetHeight && this.fallthrough === "yes") {
 		return true;
 	}
-	this.scrollIntoView(event.target);
+	if(event.paramObject && event.paramObject.selector) {
+		this.scrollSelectorIntoView(null,event.paramObject.selector);
+	} else {
+		this.scrollIntoView(event.target);			
+	}
 	return false; // Handled event
 };
 
@@ -130,6 +134,14 @@ ScrollableWidget.prototype.scrollIntoView = function(element) {
 	}
 };
 
+ScrollableWidget.prototype.scrollSelectorIntoView = function(baseElement,selector,callback) {
+	baseElement = baseElement || document.body;
+	var element = baseElement.querySelector(selector);
+	if(element) {
+		this.scrollIntoView(element,callback);		
+	}
+};
+
 /*
 Render this widget into the DOM
 */