Use lozad for lazy image loading

Ref: grouped-emoji-picker

package.json

@@ -32,6 +32,7 @@
     "diff": "3.5.0",
     "escape-html": "1.0.3",
     "localforage": "1.10.0",
+    "lozad": "^1.16.0",
     "parse-link-header": "1.0.1",
     "phoenix": "1.6.2",
     "punycode.js": "2.1.0",

src/components/emoji_picker/emoji_picker.js

@@ -1,5 +1,6 @@
 import { defineAsyncComponent } from 'vue'
 import Checkbox from '../checkbox/checkbox.vue'
+import LazyImageContainer from '../../directives/lazy_image_container'
 import { library } from '@fortawesome/fontawesome-svg-core'
 import {
   faBoxOpen,
@@ -63,6 +64,9 @@ const EmojiPicker = {
     StickerPicker: defineAsyncComponent(() => import('../sticker_picker/sticker_picker.vue')),
     Checkbox
   },
+  directives: {
+    LazyImageContainer
+  },
   methods: {
     onStickerUploaded (e) {
       this.$emit('sticker-uploaded', e)
@@ -183,7 +187,7 @@ const EmojiPicker = {
       this.showingStickers = value
     },
     limitedEmojis (list, groupId) {
-      return list.slice(0, this.loadedCount[groupId])
+      return list // list.slice(0, this.loadedCount[groupId])
     },
     filterByKeyword (list, keyword) {
       return filterByKeyword(list, keyword)

src/components/emoji_picker/emoji_picker.vue

@@ -61,6 +61,7 @@
         </div>
         <div
           ref="emoji-groups"
+          v-lazy-image-container
           class="emoji-groups"
           :class="groupsScrolledClass"
           @scroll="onScroll"
@@ -86,7 +87,7 @@
               <span v-if="!emoji.imageUrl">{{ emoji.replacement }}</span>
               <img
                 v-else
-                :src="emoji.imageUrl"
+                :data-src="emoji.imageUrl"
               >
             </span>
             <span :ref="'group-end-' + group.id" />

src/directives/lazy_image_container.js

@@ -0,0 +1,13 @@
+
+import lozad from 'lozad'
+
+const LazyImageContainer = {
+  inserted (el) {
+    const images = el.querySelectorAll('img')
+    console.log(images.length)
+    el.$observer = lozad(images)
+    el.$observer.observe()
+  }
+}
+
+export default LazyImageContainer

yarn.lock

@@ -6383,6 +6383,11 @@ lower-case@^1.1.1:
   version "1.1.4"
   resolved "https://registry.yarnpkg.com/lower-case/-/lower-case-1.1.4.tgz#9a2cabd1b9e8e0ae993a4bf7d5875c39c42e8eac"
 
+lozad@^1.16.0:
+  version "1.16.0"
+  resolved "https://registry.yarnpkg.com/lozad/-/lozad-1.16.0.tgz#86ce732c64c69926ccdebb81c8c90bb3735948b4"
+  integrity sha512-JBr9WjvEFeKoyim3svo/gsQPTkgG/mOHJmDctZ/+U9H3ymUuvEkqpn8bdQMFsvTMcyRJrdJkLv0bXqGm0sP72w==
+
 lru-cache@^4.0.1:
   version "4.1.5"
   resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-4.1.5.tgz#8bbe50ea85bed59bc9e33dcab8235ee9bcf443cd"