fix typo, update maxScrollAmount continuously

Author: phucbm

README.md

@@ -1,11 +1,11 @@
-# jquery-scroll-direction-plugin
+# Scroll Direction 1.0.1
 A lightweight jQuery plugin to detect scroll direction.
 
 **[View the Demo on CodePen →](https://codepen.io/phucbui/pen/yLaeqBw)**
 
 ## Getting started
 
-### 1. Include Scroll Direction Plugin to your site.
+### 1. Include Scroll Direction to your site.
 
 **Direct Download**
 
@@ -17,14 +17,14 @@ You can [download the plugin directly from Github](https://raw.githubusercontent
 
 **CDN** [![](https://data.jsdelivr.com/v1/package/gh/phucbm/jquery-scroll-direction-plugin/badge)](https://www.jsdelivr.com/package/gh/phucbm/jquery-scroll-direction-plugin)
 
-You can also browse for the latest version by visiting [Scroll Direction Plugin on jsDelivr](https://cdn.jsdelivr.net/gh/phucbm/jquery-scroll-direction-plugin/)
+You can also browse for the latest version by visiting [Scroll Direction on jsDelivr](https://cdn.jsdelivr.net/gh/phucbm/jquery-scroll-direction-plugin/)
 
 ```html
-<!-- Scroll Direction Plugin - v1.0.0 -->
-<script src="https://cdn.jsdelivr.net/gh/phucbm/jquery-scroll-direction-plugin@1.0.0/jquery.scroll-direction.js"></script>
+<!-- Scroll Direction - v1.0.1 -->
+<script src="https://cdn.jsdelivr.net/gh/phucbm/jquery-scroll-direction-plugin@1.0.1/jquery.scroll-direction.js"></script>
 
-<!-- Scroll Direction Plugin - v1.0.0 - minified -->
-<script src="https://cdn.jsdelivr.net/gh/phucbm/jquery-scroll-direction-plugin@1.0.0/jquery.scroll-direction.min.js"></script>
+<!-- Scroll Direction - v1.0.1 - minified -->
+<script src="https://cdn.jsdelivr.net/gh/phucbm/jquery-scroll-direction-plugin@1.0.1/jquery.scroll-direction.min.js"></script>
 ```
 
 ### 2. Initialize Scroll Direction
@@ -40,7 +40,7 @@ $.scrollDirection.init();
 
 ### 1. Methods
 
-#### $.scrollDirection.init()
+- `$.scrollDirection.init()`
 
 ```js
 // init Scroll Direction with full settings

jquery.scroll-direction.js

@@ -1,5 +1,5 @@
 /**
- * jQuery Scroll Direction Plugin 1.0.0
+ * jQuery Scroll Direction Plugin 1.0.1
  * https://github.com/phucbm/jquery-scroll-direction-plugin
  *
  * MIT License | Copyright (c) 2020 Minh-Phuc Bui
@@ -27,7 +27,6 @@
     // Method: init()
     obj.init = function (options) {
         pluginActive = true;
-        // update settings
         settings = $.extend(settings, options);
     };
 
@@ -80,43 +79,44 @@
 
     // Main process
     let $w = $(window),
-        lasScrollAmount = false,
+        lastScrollAmount = false,
         scrollAmount = $w.scrollTop(),
         maxScrollAmount = $(document).height() - $w.height();
     $w.on("load scroll resize", function () {
         if (pluginActive) {
             // update values
             scrollAmount = $w.scrollTop();
+            maxScrollAmount = $(document).height() - $w.height();
 
             // check scroll directions
-            if (scrollAmount > lasScrollAmount && lasScrollAmount >= 0) {
+            if (scrollAmount > lastScrollAmount && lastScrollAmount >= 0) {
                 // scroll down
                 obj.isScrollUp = false;
                 obj.isScrollDown = true;
 
                 $w.trigger(scrollDown);
-            } else if (scrollAmount < lasScrollAmount && lasScrollAmount >= 0) {
+            } else if (scrollAmount < lastScrollAmount && lastScrollAmount >= 0) {
                 // scroll up
                 obj.isScrollUp = true;
                 obj.isScrollDown = false;
 
                 $w.trigger(scrollUp);
             } else if (scrollAmount < 0) {
-                // elastic scroll: negative value
+                // scroll up (elastic scroll with negative value)
                 obj.isScrollUp = true;
                 obj.isScrollDown = false;
 
                 $w.trigger(scrollUp);
             } else if (scrollAmount > maxScrollAmount) {
-                // elastic scroll: position value
+                // scroll down (elastic scroll with positive value)
                 obj.isScrollUp = false;
                 obj.isScrollDown = true;
 
                 $w.trigger(scrollDown);
             }
 
             // update the last position
-            lasScrollAmount = scrollAmount;
+            lastScrollAmount = scrollAmount;
 
             // check scroll positions
             if (scrollAmount <= settings.topOffset) {