Allow setting form id or class on base_form.html

gas/templates/gas/base_form.html

@@ -4,7 +4,10 @@
 {% load form_tags %}
 
 {% block content %}
-    <form action="." method="POST" enctype="multipart/form-data">{% csrf_token %}
+    <form {% if form_id %} id="{{ form_id }}" {% endif %}
+          {% if form_class %} class="{{ form_class }}" {% endif %}
+          action="." method="POST"
+          enctype="multipart/form-data">{% csrf_token %}
         {% if is_popup %}
             <input type="hidden" name="_popup" value="1">
         {% endif %}

gas/views.py

@@ -201,6 +201,7 @@ class GASCreateView(GASMixin, CreateView):
         is_popup = "_popup" in self.request.GET
         ctx.update({
             'is_popup': is_popup,
+            'form_id': 'main-form',
         })
         return ctx
 
@@ -220,6 +221,13 @@ class GASUpdateView(GASMixin, UpdateView):
     """ Same as Django's UpdateView, defined only for completeness. """
     template_name = 'gas/base_form.html'
 
+    def get_context_data(self, **kwargs):
+        ctx = super().get_context_data(**kwargs)
+        ctx.update({
+            'form_id': 'main-form',
+        })
+        return ctx
+
 
 class GASDeleteView(GASMixin, DeleteView):
     template_name = "gas/delete_confirmation.html"