[damned-lies] Removed onclick javascript syntax

[Claude Paroz <claudep src gnome org>]

commit 00b0ee3e4230b037bd20e38797b0b952ce194c9d
Author: Claude Paroz <claude 2xlibre net>
Date:   Sat Apr 17 16:02:41 2021 +0200

    Removed onclick javascript syntax

 common/static/js/main.js                     | 15 +++++++++++++++
 templates/base.html                          |  8 --------
 templates/people/person_team_membership.html |  4 ++--
 3 files changed, 17 insertions(+), 10 deletions(-)
---
diff --git a/common/static/js/main.js b/common/static/js/main.js
index ab43bf97..8aeb8955 100644
--- a/common/static/js/main.js
+++ b/common/static/js/main.js
@@ -29,3 +29,18 @@ dl = (function($, undefined){
         $('#hide-completed-modules').click(hide);
     });
 })($);
+
+// ***
+// Attach event handlers
+// ***
+$(document).ready(function () {
+    $(document).on('hidden.bs.modal', (ev) => {
+        $(ev.target).removeData('bs.modal');
+    });
+    $('button.confirm').click((ev) => {
+        if (!confirm(ev.target.dataset.confirm)) {
+            ev.preventDefault();
+            return false;
+        }
+    });
+});
diff --git a/templates/base.html b/templates/base.html
index 9eb975cf..391b0390 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -17,14 +17,6 @@
   <script src="{% static 'js/modal.js' %}"></script>
   <script src="{% static 'js/login.js' %}"></script>
 
-  <script>
-    $(document).ready(function () {
-      $(document).on('hidden.bs.modal', function (e) {
-        $(e.target).removeData('bs.modal');
-      });
-    });
-  </script>
-
   {% block extrahead %}{% endblock %}
 </head>
 
diff --git a/templates/people/person_team_membership.html b/templates/people/person_team_membership.html
index b9c82fa0..9a50c436 100644
--- a/templates/people/person_team_membership.html
+++ b/templates/people/person_team_membership.html
@@ -10,8 +10,8 @@
           {% if on_own_page %}
           <form class="inline" method="post" action="{% url 'person_team_leave' role.team.name %}">
             {% csrf_token %}
-            <input type="submit" value="{% trans 'Leave' %}"
-                   onClick="javascript:return confirm('{% trans "Are you sure you want to leave the team?" 
%}')">
+            <button type="submit" class="confirm"
+                    data-confirm="{% trans 'Are you sure you want to leave the team?' %}">{% trans 'Leave' 
%}</button>
           </form>
           {% endif %}
       </li>