not longer trigger content script if sku not found on idArray

background.js

@@ -49,7 +49,6 @@ chrome.downloads.onDeterminingFilename.addListener(function(item, suggest) {
   //     skus = items.idArray.split(',');
   //   });
   // }
-  console.log(item.url);
   if(item.url.includes("https://digitallibrary-external.fastretailing.com/api/asset")){
     var new_filename = skus[index] + ".zip"; 
     suggest({filename: new_filename});

contentScript.js

@@ -21,17 +21,30 @@ if (link.match(/login/g)){
     var index = 0;
     var noImage = false;
     //Get back the current sku's index from idArray
-    chrome.storage.local.get('idArray', function (items) {
-        a = items.idArray.split(',');
-        var sku = document.location.href.match(/[0-9]{6}/g).toString();
-        index = a.indexOf(sku);
-    });
 
-    window.onload = function() {
+    window.onload = async function() {
         var currentSku = document.location.href.match(/w=.*&/g);
         currentSku = currentSku.toString().replace(/(w=|&)/g,"");
         var el = document.querySelector(".jsx-334935779 .asset-list");
         var count = 0;
+
+        let getIndex = async function(){
+            return new Promise(resolve => {
+                chrome.storage.local.get('idArray', function (items) {
+                    a = items.idArray.split(',');
+                    var sku = document.location.href.match(/[0-9]{6}/g).toString();
+                    resolve(a.indexOf(sku));
+                });
+            });
+        }
+
+        index = await getIndex();
+        
+        // if cannot found index from storage
+        if(index === -1){
+            return;
+        }
+
         //Scroll down every 4 second, if 3 times no scroll change, download images
         var scroll = setInterval(function() {
             var currentScrollTop = el.scrollTop;
@@ -39,7 +52,7 @@ if (link.match(/login/g)){
             var scrolledTop = el.scrollTop;
             console.log(scrolledTop - currentScrollTop);
             if(scrolledTop - currentScrollTop == 0) {
-                count +=1;
+                count += 1;
             } else {
                 count = 0;
             }