pt-check-in/read-id.html at main · PrairieLearn/pt-check-in · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <script>
      window.parentOrigin = "*"; // Change to "https://www.prairietest.org" or similar

      var ready = function(callback) {
          if (document.readyState != "loading") callback();
          else document.addEventListener("DOMContentLoaded", callback);
      };

      ready(() => {
          window.addEventListener("message", (event) => {
              //if (event.origin !== window.parentOrigin) return; // Uncomment this line for production
              if (!event.data) return;

              if (event.data.tag == 'init') {
                  window.secret = event.data.secret;
                  window.parent.postMessage({tag: 'initialized', secret: window.secret}, window.parentOrigin);
                  document.getElementById('status').textContent = 'Successfully initialized.';
              }
          }, false);
      });
    </script>
  </head>
  <body>
    <p>
      This is <tt>read-id.html</tt>
    </p>
    <p>
      Status: <span id="status">Initializing...</span>
    </p>
    <p>
      <label for="uid">UID:</label>
      <input id="uid">
      <button onclick="window.parent.postMessage({tag: 'read-id', secret: window.secret, uid: document.getElementById('uid').value}, window.parentOrigin);">
        Send UID
      </button>
    </p>
    <p>
      <label for="uin">UIN:</label>
      <input id="uin">
      <button onclick="window.parent.postMessage({tag: 'read-id', secret: window.secret, uin: document.getElementById('uin').value}, window.parentOrigin);">
        Send UIN
      </button>
    </p>
  </body>
</html>