added cdn + fallback

esg-epfl-apc · Oct 31, 2023 · 0773936 · 0773936
1 parent b552396
commit 0773936
Showing 1 changed file with 30 additions and 6 deletions.
diff --git a/config/plugins/visualizations/fits_image_viewer/src/script.js b/config/plugins/visualizations/fits_image_viewer/src/script.js
@@ -1,7 +1,31 @@
-let aladin;
+var aladin;
 
-A.init.then(() => {
-    aladin = A.aladin('#aladin-lite-div', {showCooGridControl: true});
-    aladin.displayFITS(file_url)
-    aladin.showCooGrid(true);
-});
+function initializeAladinLite() {
+    A.init.then(() => {
+        aladin = A.aladin('#aladin-lite-div', {showCooGridControl: true});
+        aladin.displayFITS(fileUrl)
+        aladin.showCooGrid(true);
+    });
+}
+
+function localScriptLoadingError() {
+    addScriptToHead(appRoot+aladinLiteScriptAlternativeLocation);
+}
+
+function cdnLoadingError() {
+    addScriptToHead(appRoot+aladinLiteScriptLocation, localScriptLoadingError);
+}
+
+function addScriptToHead(url, onerrorFunction) {
+    const scriptToAdd = document.createElement("script");
+    scriptToAdd.onload = initializeAladinLite;
+
+    if(onerrorFunction) {
+        scriptToAdd.onerror = onerrorFunction
+    }
+
+    document.head.appendChild(scriptToAdd);
+    scriptToAdd.src = url;
+}
+
+addScriptToHead(aladinLiteCDNUrl, cdnLoadingError);