add timeout, ensure multiple attempts at adding, limit var scope

Author: guimachiavelli

fathom-data-attr.js

@@ -1,12 +1,22 @@
-const spaValue = "auto";
+(function(){
+  let attempts = 0;
 
-function addDataAttr() {
-  const el = document.getElementById("fathom-script");
-  const dataSpaValue = el.dataset.spa;
+  function addDataAttr() {
+    const spaValue = "auto";
+    const el = document.getElementById("fathom-script");
+    attempts += 1;
+    
+    if (!el && attempts < 10) {
+      window.setTimeout(addDataAttr, 100);
+      return;
+    }
 
-  if (dataSpaValue === undefined) {
-    el.dataset.spa = spaValue;
+    const dataSpaValue = el.dataset.spa;
+
+    if (dataSpaValue === undefined) {
+      el.dataset.spa = spaValue;
+    }
   }
-}
 
-addDataAttr();
+  addDataAttr();
+})();