add spinner on img load

frontend/src/static/js/components/media-page/MediaPage.scss

@@ -553,6 +553,10 @@
   max-width: 90%;
 }
 
+.slideshow-image{
+  position: relative;
+}
+
 .slideshow-image img {
   display: block;
   width: auto;
@@ -569,7 +573,7 @@
   text-align: start;
   font-size: 16px;
   font-weight: bold;
-  color: #F0F0F0;
+  color: #bdb6b6;
   z-index: 1200;
 }
 

frontend/src/static/js/components/media-viewer/ImageViewer.js

@@ -1,6 +1,7 @@
 import React, { useContext, useEffect, useState } from 'react';
 import { SiteContext } from '../../utils/contexts/';
 import { MediaPageStore } from '../../utils/stores/';
+import { SpinnerLoader } from '../_shared';
 import Tooltip from '../_shared/ToolTip';
 
 export default function ImageViewer() {
@@ -15,6 +16,7 @@ export default function ImageViewer() {
   const [slideshowItems, setSlideshowItems] = useState([]);
   const [isModalOpen, setIsModalOpen] = useState(false);
   const [currentIndex, setCurrentIndex] = useState(0);
+  const [isImgLoading, setIsImgLoading] = useState(true);
 
   function onImageLoad() {
     setImage(getImageUrl());
@@ -70,14 +72,19 @@ export default function ImageViewer() {
   const onClose = () => setIsModalOpen(false);
 
   const handleNext = () => {
+    setIsImgLoading(true);
     setCurrentIndex((prevIndex) => (prevIndex + 1) % slideshowItems.length);
   };
 
   const handlePrevious = () => {
+    setIsImgLoading(true);
     setCurrentIndex((prevIndex) => (prevIndex - 1 + slideshowItems.length) % slideshowItems.length);
   };
 
-  const handleDotClick = (index) => setCurrentIndex(index);
+  const handleDotClick = (index) => {
+    setIsImgLoading(true);
+    setCurrentIndex(index);
+  };
 
   const handleImageClick = (index) => {
     const mediaPageUrl = site.url + slideshowItems[index]?.url;
@@ -92,22 +99,28 @@ export default function ImageViewer() {
       {isModalOpen && slideshowItems && (
         <div className="modal-overlay" onClick={() => setIsModalOpen(false)}>
           <div className="slideshow-container" onClick={(e) => e.stopPropagation()}>
+            {!isImgLoading && (
               <button className="arrow left" onClick={handlePrevious} aria-label="Previous slide">
                 &#8249;
               </button>
+            )}
             <div className="slideshow-image">
+              {isImgLoading && <SpinnerLoader size="large"/>}
               <img
                 src={site.url + '/' + slideshowItems[currentIndex]?.original_media_url}
                 alt={`Slide ${currentIndex + 1}`}
                 onClick={() => handleImageClick(currentIndex)}
+                onLoad={() => setIsImgLoading(false)}
+                onError={() => setIsImgLoading(false)}
+                style={{ display: isImgLoading ? 'none' : 'block' }}
               />
-              <div className="slideshow-title">
+              {!isImgLoading && <div className="slideshow-title">{slideshowItems[currentIndex]?.title}</div>}
-              {slideshowItems[currentIndex]?.title}
-            </div>
             </div>
+            {!isImgLoading && (
               <button className="arrow right" onClick={handleNext} aria-label="Next slide">
                 &#8250;
               </button>
+            )}
             <div className="dots">
               {slideshowItems.map((_, index) => (
                 <span