Create function to create a new DOM parser (#1114)

2 files changed, 14 insertions, 2 deletions

diff --git a/ext/bg/js/audio-downloader.js b/ext/bg/js/audio-downloader.js
index ddddfe18..839eab7b 100644
--- a/ext/bg/js/audio-downloader.js
+++ b/ext/bg/js/audio-downloader.js
@@ -109,7 +109,7 @@ class AudioDownloader {
         });
         const responseText = await response.text();
 
-        const dom = new NativeSimpleDOMParser(responseText);
+        const dom = this._createSimpleDOMParser(responseText);
         for (const row of dom.getElementsByClassName('dc-result-row')) {
             try {
                 const audio = dom.getElementByTagName('audio', row);
@@ -149,7 +149,7 @@ class AudioDownloader {
         });
         const responseText = await response.text();
 
-        const dom = new NativeSimpleDOMParser(responseText);
+        const dom = this._createSimpleDOMParser(responseText);
         try {
             const audio = dom.getElementById(`audio_${expression}:${reading}`);
             if (audio !== null) {
@@ -237,4 +237,12 @@ class AudioDownloader {
     _arrayBufferToBase64(arrayBuffer) {
         return btoa(String.fromCharCode(...new Uint8Array(arrayBuffer)));
     }
+
+    _createSimpleDOMParser(content) {
+        if (NativeSimpleDOMParser.isSupported()) {
+            return new NativeSimpleDOMParser(content);
+        } else {
+            throw new Error('DOM parsing not supported');
+        }
+    }
 }
diff --git a/ext/bg/js/native-simple-dom-parser.js b/ext/bg/js/native-simple-dom-parser.js
index 2aa4134d..4e0d89ea 100644
--- a/ext/bg/js/native-simple-dom-parser.js
+++ b/ext/bg/js/native-simple-dom-parser.js
@@ -43,4 +43,8 @@ class NativeSimpleDOMParser {
     getTextContent(element) {
         return element.textContent;
     }
+
+    static isSupported() {
+        return typeof DOMParser !== 'undefined';
+    }
 }