username as email default when logged in

snippets/order.html

@@ -2,6 +2,10 @@
 <script src="https://cdn.jsdelivr.net/jquery/latest/jquery.min.js"></script>
 <script src="static/js/order.js"></script>
 
+{{ if ne .UserName "" }}
+<p id="username" hidden>{{.UserName}}</p>
+{{ end }}
+
 <div id="success_message" class="message is-success is-hidden">
   <div class="message-body">
     <p class="has-text-weight-bold">Vielen Dank!</p>

static/js/order.js

@@ -17,6 +17,11 @@ function validate(what, text) {
 }
 
 $(document).ready(function () {
+  var username = $("#username").html();
+  if (username != "") {
+    $("#email").val(username);
+  }
+  console.log(username);
   $("#quantity_exclamation").hide();
   $("#email_exclamation").hide();