1 files changed, 24 insertions, 0 deletions
diff --git a/app/assets/javascripts/lib/utils/scroll_utils.js b/app/assets/javascripts/lib/utils/scroll_utils.js
index 9313b570863..b4da1e16f08 100644
--- a/app/assets/javascripts/lib/utils/scroll_utils.js
+++ b/app/assets/javascripts/lib/utils/scroll_utils.js
@@ -4,6 +4,7 @@ export const canScroll = () => $(document).height() > $(window).height();
 
 /**
  * Checks if the entire page is scrolled down all the way to the bottom
+ *  @returns {Boolean}
  */
 export const isScrolledToBottom = () => {
   const $document = $(document);
@@ -16,11 +17,34 @@ export const isScrolledToBottom = () => {
   return scrollHeight - currentPosition === windowHeight;
 };
 
+/**
+ * Checks if page is scrolled to the top
+ * @returns {Boolean}
+ */
+export const isScrolledToTop = () => $(document).scrollTop() === 0;
+
 export const scrollDown = () => {
   const $document = $(document);
   $document.scrollTop($document.height());
 };
 
+export const scrollUp = () => {
+  $(document).scrollTop(0);
+};
+
+/**
+ * Checks if scroll position is in the middle of the page
+ * @returns {Boolean}
+ */
+export const isScrolledToMiddle = () => {
+  const $document = $(document);
+  const currentPosition = $document.scrollTop();
+  const scrollHeight = $document.height();
+  const windowHeight = $(window).height();
+
+  return currentPosition > 0 && scrollHeight - currentPosition !== windowHeight;
+};
+
 export const toggleDisableButton = ($button, disable) => {
   if (disable && $button.prop('disabled')) return;
   $button.prop('disabled', disable);