From 8482b8a7b4e5d2241aeadaa5796d0ca764c3d912 Mon Sep 17 00:00:00 2001
From: Fabien LOISON <flo@flogisoft.com>
Date: Thu, 1 Sep 2016 11:01:41 +0200
Subject: [PATCH] take scroll into account in absolute position calculation

---
 src/helpers.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/helpers.js b/src/helpers.js
index ed87092d..efd207fe 100644
--- a/src/helpers.js
+++ b/src/helpers.js
@@ -106,12 +106,16 @@ Helpers.getAbsolutePosition = function (element) {
     if (!(element instanceof Element)) {
         return {x: 0, y: 0};
     }
+
     var css;
+    var origElement = element;
+
     try {
         css = getComputedStyle(element);
     } catch (e) {
         return {x: 0, y: 0};
     }
+
     if (!css) {
         return {x: 0, y: 0};
     }
@@ -131,6 +135,14 @@ Helpers.getAbsolutePosition = function (element) {
         element = element.offsetParent;
     }
 
+    element = origElement;
+
+    while (element.parentNode && !(element instanceof HTMLBodyElement)) {
+        x -= element.scrollLeft || 0;
+        y -= element.scrollTop || 0;
+        element = element.parentNode;
+    }
+
     return {x: x, y: y};
 };