From b19c24c0cabfb8b25a16d816b806d1dc51069721 Mon Sep 17 00:00:00 2001
From: Marcello Stanisci <stanisci.m@gmail.com>
Date: Wed, 6 Jun 2018 22:36:50 +0200
Subject: Scrolling feature.

Disabling the scrolling feature after the
page gets filled by /track/transaction results.
Such results are not guaranteed to be sorted
in any way, so there is little point in scrolling
down towards "older" results.

The scrolling feature will be re-enabled once
the page will again be filled with results from
/history - notably, on page refresh.
---
 js/backoffice.js | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/js/backoffice.js b/js/backoffice.js
index 82b0ae6..35e5c88 100644
--- a/js/backoffice.js
+++ b/js/backoffice.js
@@ -31,6 +31,7 @@ var FRACTION = 100000000;
 var START = 0;
 var DELTA = 5
 var LAST = 0;
+var SCROLL = true;
 
 /**
  * This function *could* "type check" 'amount',
@@ -161,6 +162,13 @@ var track_transfer = function(exchange, wtid, cb){
     if(4 == req.readyState){
       switch(req.status){
       case 200:
+        /* Scroll is disabled after showing /track/transfer
+         * results on the page; that's because those results
+         * are not guaranteed to be sorted any how, so there
+         * is little to no point in scrolling towards "older"
+         * results: older than what?  The scroll feature will
+         * be re-enabled from the /history callback.  */
+        SCROLL = false;
         var tracks = JSON.parse(req.responseText);
         cb(false,
            tracks.deposits_sums,
@@ -538,6 +546,7 @@ function change_instance(){
  * to 'fill_table()'.
  */
 function get_history(scroll, cb){
+  SCROLL = true;
   var qs = `/history?instance=${get_instance()}&delta=${DELTA}`;
   if(scroll){
     START = LAST;
@@ -579,8 +588,8 @@ document.addEventListener
 document.addEventListener
   ("scroll", function(){
   /* If page bottom is hit */
-  if(window.innerHeight + window.scrollY
-       >= document.body.offsetHeight)
+  if((window.innerHeight + window.scrollY
+       >= document.body.offsetHeight) && SCROLL)
     get_history(true, fill_table);
   });
 
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