From f16c26470e015b533283194973cc4bec470c0c66 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=BF=9E=E4=BA=9A=E8=BE=89?= <634236658@qq.com>
Date: Fri, 7 Nov 2014 16:44:51 +0800
Subject: [PATCH] add option:scrollElement

---
 src/jquery.scrollUp.js | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/src/jquery.scrollUp.js b/src/jquery.scrollUp.js
index 445df9b..65139d0 100644
--- a/src/jquery.scrollUp.js
+++ b/src/jquery.scrollUp.js
@@ -34,7 +34,7 @@
             $self.attr('title', o.scrollTitle);
         }
 
-        $self.appendTo('body');
+        $self.appendTo(document.body);
 
         // If not using an image display text
         if (!(o.scrollImg || o.scrollTrigger)) {
@@ -89,8 +89,8 @@
         }
 
         // Scroll function
-        scrollEvent = $(window).scroll(function () {
-            if ($(window).scrollTop() > scrollDis) {
+        scrollEvent = $(o.scrollElement).scroll(function () {
+            if ($(o.scrollElement).scrollTop() > scrollDis) {
                 if (!triggerVisible) {
                     $self[animIn](animSpeed);
                     triggerVisible = true;
@@ -117,7 +117,12 @@
         $self.click(function (e) {
             e.preventDefault();
 
-            $('html, body').animate({
+            var ele = o.scrollElement;
+            if (ele === window)
+                ele = 'html, body';
+
+
+            $(ele).animate({
                 scrollTop: scrollTarget
             }, o.scrollSpeed, o.easingType);
         });
@@ -138,7 +143,8 @@
         scrollTitle: false,          // Set a custom <a> title if required. Defaults to scrollText
         scrollImg: false,            // Set true to use image
         activeOverlay: false,        // Set CSS color to display scrollUp active point, e.g '#00FFFF'
-        zIndex: 2147483647           // Z-Index for the overlay
+        zIndex: 2147483647,           // Z-Index for the overlay
+        scrollElement: window
     };
 
     // Destroy scrollUp plugin and clean all modifications to the DOM
@@ -149,11 +155,11 @@
 
         // If 1.7 or above use the new .off()
         if ($.fn.jquery.split('.')[1] >= 7) {
-            $(window).off('scroll', scrollEvent);
+            $($.fn.scrollUp.settings.scrollElement).off('scroll', scrollEvent);
 
-        // Else use the old .unbind()
+            // Else use the old .unbind()
         } else {
-            $(window).unbind('scroll', scrollEvent);
+            $($.fn.scrollUp.settings.scrollElement).unbind('scroll', scrollEvent);
         }
     };