<p></p>
<p><b>@AntonKhorev</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/4402#discussion_r1425442817">app/assets/javascripts/user.js</a>:</p>
<pre style='color:#555'>> @@ -223,4 +223,62 @@ $(document).ready(function () {
   $("#read_tou").on("click", function () {
     $("#continue").prop("disabled", !($(this).prop("checked") && $("#read_ct").prop("checked")));
   });
+
+
+  const isTaken /* Record<string, string> */ = {}
+
+  function indicateInvalidDisplayName(isValid /* boolean | undefined*/) {
+    // isValid might also be 'undefined', hence we check explicitly for 'true' and 'false'
+    $("#user_display_name").toggleClass("is-valid", isValid === true)
+    $("#user_display_name").toggleClass("is-invalid", isValid === false)
+  }
+
+  function checkDisplayName(){
+    const displayName = $("#user_display_name").val()
+    if(displayName === ""){
</pre>
<p dir="auto">Right now if I start typing the name, this code will say that the name is valid after the first typed character. But it's obviously invalid.</p>

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