init index when enter info, attempt on getting idArray if skus empty to reduce...

init index when enter info, attempt on getting idArray if skus empty to reduce chance on undefined file name

background.js

@@ -15,8 +15,13 @@ chrome.declarativeContent.onPageChanged.removeRules(undefined, function() {
 
 chrome.extension.onMessage.addListener(function(request,sender,sendResponse){
   if(request.idArray) {
+    // init
+    index = 0;
+    noImages = "";
+
     skus = request.idArray.split(',');
     console.log(skus);
+
   } else if(request.nothing == "true") {
     console.log("Message : nothing ");
     index++;
@@ -34,6 +39,13 @@ chrome.extension.onMessage.addListener(function(request,sender,sendResponse){
 });
 
 chrome.downloads.onDeterminingFilename.addListener(function(item, suggest) {
+
+  if(!skus.length){
+    chrome.storage.local.get('idArray', function (items) {
+      skus = items.idArray.split(',');
+    });
+  }
+
   var new_filename = skus[index] + ".zip"; 
   suggest({filename: new_filename});
   index++;