dashboard: warn the user to select something in template choose

circle/dashboard/static/dashboard/dashboard.js

@@ -46,6 +46,16 @@ $(function () {
         $('#create-modal').on('hidden.bs.modal', function() {
           $('#create-modal').remove();
         });
+        // check if user selected anything
+        $("#template-choose-next-button").click(function() {
+          var radio = $('input[type="radio"]:checked', "#template-choose-form").val();
+          if(!radio) {
+            $("#template-choose-alert").addClass("alert-warning")
+            .text(gettext("Select an option to proceed!"));
+            return false;
+          }
+          return true;
+        });
       }
     });
     return false;

circle/dashboard/templates/dashboard/_template-create-1.html

 {% load i18n %}
 
-<div class="alert alert-info">
+<div class="alert alert-info" id="template-choose-alert">
   {% trans "Customize an existing template or create a brand new one from scratch!" %}
 </div>
 
-<form action="{% url "dashboard.views.template-choose" %}" method="POST">
+<form action="{% url "dashboard.views.template-choose" %}" method="POST"
+  id="template-choose-form">
   {% csrf_token %}
   <div class="template-choose-list">
     {% for t in templates %}
@@ -19,7 +20,7 @@
       <input type="radio" name="parent" value="base_vm"/>
       {% trans "Create a new base VM without disk" %}
     </div>
-    <button type="submit" class="btn btn-success pull-right">{% trans "Next" %}</button>
+    <button type="submit" id="template-choose-next-button" class="btn btn-success pull-right">{% trans "Next" %}</button>
     <div class="clearfix"></div>
   </div>
 </form>

circle/dashboard/views.py

@@ -853,6 +853,9 @@ class TemplateChoose(TemplateView):
         template = request.POST.get("parent")
         if template == "base_vm":
             return redirect(reverse("dashboard.views.template-create"))
+        elif template is None:
+            messages.warning(request, _("Select an option to proceed!"))
+            return redirect(reverse("dashboard.views.template-choose"))
         else:
             template = get_object_or_404(InstanceTemplate, pk=template)