From 8c78e35063d72cecd391934df40a34d8e2a175d4 Mon Sep 17 00:00:00 2001
From: softsimon <softsimon@protonmail.com>
Date: Wed, 31 May 2023 14:39:19 +0700
Subject: [PATCH] Use native angular way of accessing HTML elements

---
 frontend/src/app/components/about/about.component.html |  2 +-
 frontend/src/app/components/about/about.component.ts   | 10 +++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/frontend/src/app/components/about/about.component.html b/frontend/src/app/components/about/about.component.html
index 0b3cc6dce..2936606ad 100644
--- a/frontend/src/app/components/about/about.component.html
+++ b/frontend/src/app/components/about/about.component.html
@@ -13,7 +13,7 @@
     <p i18n>Our mempool and blockchain explorer for the Bitcoin community, focusing on the transaction fee market and multi-layer ecosystem, completely self-hosted without any trusted third-parties.</p>
   </div>
 
-  <video id="promoVideo" (click)="unmutePromoVideo()" (touchstart)="unmutePromoVideo()" src="/resources/promo-video/mempool-promo.mp4" poster="/resources/promo-video/mempool-promo.jpg" controls loop playsinline [autoplay]="true" [muted]="true">
+  <video #promoVideo (click)="unmutePromoVideo()" (touchstart)="unmutePromoVideo()" src="/resources/promo-video/mempool-promo.mp4" poster="/resources/promo-video/mempool-promo.jpg" controls loop playsinline [autoplay]="true" [muted]="true">
     <track label="English" kind="captions" srclang="en" src="/resources/promo-video/en.vtt" [attr.default]="showSubtitles('en') ? '' : null">
     <track label="日本語" kind="captions" srclang="ja" src="/resources/promo-video/ja.vtt" [attr.default]="showSubtitles('ja') ? '' : null">
     <track label="中文" kind="captions" srclang="zh" src="/resources/promo-video/zh.vtt" [attr.default]="showSubtitles('zh') ? '' : null">
diff --git a/frontend/src/app/components/about/about.component.ts b/frontend/src/app/components/about/about.component.ts
index 7beb47f8a..176490add 100644
--- a/frontend/src/app/components/about/about.component.ts
+++ b/frontend/src/app/components/about/about.component.ts
@@ -1,4 +1,4 @@
-import { ChangeDetectionStrategy, Component, Inject, LOCALE_ID, OnInit } from '@angular/core';
+import { ChangeDetectionStrategy, Component, ElementRef, Inject, LOCALE_ID, OnInit, ViewChild } from '@angular/core';
 import { WebsocketService } from '../../services/websocket.service';
 import { SeoService } from '../../services/seo.service';
 import { StateService } from '../../services/state.service';
@@ -17,6 +17,7 @@ import { DOCUMENT } from '@angular/common';
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
 export class AboutComponent implements OnInit {
+  @ViewChild('promoVideo') promoVideo: ElementRef;
   backendInfo$: Observable<IBackendInfo>;
   sponsors$: Observable<any>;
   translators$: Observable<ITranslators>;
@@ -91,12 +92,11 @@ export class AboutComponent implements OnInit {
     }
   }
 
-  showSubtitles(language) {
+  showSubtitles(language): boolean {
     return ( this.locale.startsWith( language ) && !this.locale.startsWith('en') );
   }
 
-  unmutePromoVideo() {
-    let video = <HTMLVideoElement>this.document.getElementById('promoVideo');
-    video.muted = false;
+  unmutePromoVideo(): void {
+    this.promoVideo.nativeElement.muted = false;
   }
 }