From 43072a885bb222d8e7be01824004345ae0902e43 Mon Sep 17 00:00:00 2001
From: Adewale George <3802751+adewalegeorge@users.noreply.github.com>
Date: Fri, 12 Oct 2018 11:43:38 +0100
Subject: [PATCH] offset option added

---
 src/js/modules/scrollspy.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/js/modules/scrollspy.js b/src/js/modules/scrollspy.js
index ae17cac..819f72b 100644
--- a/src/js/modules/scrollspy.js
+++ b/src/js/modules/scrollspy.js
@@ -13,6 +13,8 @@ function ScrollSpy (wrapper, opt) {
 
   this.callback = opt.callback;
 
+  this.offset = opt.offset;
+
   this.init();
 }
 
@@ -108,7 +110,7 @@ ScrollSpy.prototype.isInView = function (el) {
     scrollTop = this.doc.documentElement.scrollTop || this.doc.body.scrollTop,
     scrollBottom = scrollTop + winH,
     rect = el.getBoundingClientRect(),
-    elTop = rect.top + scrollTop,
+    elTop = rect.top + (scrollTop - (this.offset || 0)),
     elBottom = elTop + el.offsetHeight;
 
   return (elTop < scrollBottom) && (elBottom > scrollTop);