feat: disable login button on submit (#5718)

* feat: disable login button on submit

* refactor: move login js into its own file

ietf/static/js/login.js

@@ -0,0 +1,14 @@
+/**
+* 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...'
+    }
+}
+
+$(function() {
+    document.querySelector('#dt-login-form').addEventListener('submit', onLoginSubmit)
+})

ietf/templates/registration/login.html

@@ -1,12 +1,13 @@
 {# Copyright The IETF Trust 2015, All Rights Reserved #}
 {% extends "base.html" %}
+{% load static %}
 {% load origin %}
 {% load django_bootstrap5 %}
 {% block title %}Sign in{% endblock %}
 {% 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 +17,7 @@ <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 src="{% static 'ietf/js/login.js' %}"></script>
 {% endblock %}

package.json

@@ -133,6 +133,7 @@
         "ietf/static/js/js-cookie.js",
         "ietf/static/js/liaisons.js",
         "ietf/static/js/list.js",
+        "ietf/static/js/login.js",
         "ietf/static/js/manage-community-list.js",
         "ietf/static/js/manage-review-requests.js",
         "ietf/static/js/meeting-interim-request.js",