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-rw-r--r--app/assets/javascripts/lazy_loader.js15
1 files changed, 7 insertions, 8 deletions
diff --git a/app/assets/javascripts/lazy_loader.js b/app/assets/javascripts/lazy_loader.js
index 3d64b121fa7..dbbf1637a47 100644
--- a/app/assets/javascripts/lazy_loader.js
+++ b/app/assets/javascripts/lazy_loader.js
@@ -1,5 +1,3 @@
-/* eslint-disable one-export, one-var, one-var-declaration-per-line */
-
import _ from 'underscore';
export const placeholderImage = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
@@ -21,7 +19,10 @@ export default class LazyLoader {
}
searchLazyImages() {
this.lazyImages = [].slice.call(document.querySelectorAll('.lazy'));
- this.checkElementsInView();
+
+ if (this.lazyImages.length) {
+ this.checkElementsInView();
+ }
}
startContentObserver() {
const contentNode = document.querySelector(this.observerNode) || document.querySelector('body');
@@ -45,15 +46,13 @@ export default class LazyLoader {
checkElementsInView() {
const scrollTop = pageYOffset;
const visHeight = scrollTop + innerHeight + SCROLL_THRESHOLD;
- let imgBoundRect, imgTop, imgBound;
// Loading Images which are in the current viewport or close to them
this.lazyImages = this.lazyImages.filter((selectedImage) => {
if (selectedImage.getAttribute('data-src')) {
- imgBoundRect = selectedImage.getBoundingClientRect();
-
- imgTop = scrollTop + imgBoundRect.top;
- imgBound = imgTop + imgBoundRect.height;
+ const imgBoundRect = selectedImage.getBoundingClientRect();
+ const imgTop = scrollTop + imgBoundRect.top;
+ const imgBound = imgTop + imgBoundRect.height;
if (scrollTop < imgBound && visHeight > imgTop) {
LazyLoader.loadImage(selectedImage);