feat: disable login button on submit

ietf/templates/registration/login.html

@@ -6,7 +6,7 @@
 {% block content %}
     {% origin %}
     <h1>Sign in</h1>
-    <form method="post">
+    <form method="post" id="dt-login-form">
         {% csrf_token %}
         {% bootstrap_form form %}
         <div class="mt-4 mb-3">
@@ -16,4 +16,21 @@ <h1>Sign in</h1>
         </div>
         Don't have an account? <a href="{% url 'ietf.ietfauth.views.create_account' %}">Create an account</a>.
     </form>
+{% endblock %}
+{% block js %}
+    <script>
+        /**
+        * Disable Submit Button on Form Submit
+        */
+        function onLoginSubmit (ev) {
+            const submitBtn = document.querySelector('#dt-login-form button[type=submit]')
+            if (submitBtn) {
+                submitBtn.disabled = true
+                submitBtn.innerHTML = 'Signing in...'
+            }
+        }
+        $(document).ready(function () {
+            document.querySelector('#dt-login-form').addEventListener('submit', onLoginSubmit)
+        })
+    </script>
 {% endblock %}