File: sw_register.html

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script>
function waitForState(worker, state, context) {
  return new Promise(resolve => {
    function onStateChange() {
      if (worker.state === state) {
        worker.removeEventListener("statechange", onStateChange);
        resolve(context);
      }
    }

    // First add an event listener, so we won't miss any change that happens
    // before we check the current state.
    worker.addEventListener("statechange", onStateChange);

    // Now check if the worker is already in the desired state.
    onStateChange();
  });
}

(async function () {
  dump("[Dimi]register sw...\n");
  let reg = await navigator.serviceWorker.register("sw_worker.js", {scope: "."});
  await waitForState(reg.installing, "activated", reg);
  window.parent.postMessage({status: "registrationdone"}, "*");
})();

</script>
</head>
<html>