v2 with signed. Referring to PR #414

src/registrar/templates/application_form.html

@@ -18,6 +18,10 @@
         </a>
         {% endif %}
 
+{% block form_messages %}
+          {% include "includes/form_messages.html" %}
+{% endblock %}
+
 {% block form_errors %}
         {% comment %}
            to make sense of this loop, consider that 

src/registrar/templates/base.html

@@ -167,9 +167,11 @@
     {% if messages %}
     <ul class="messages">
       {% for message in messages %}
+      {% if 'base' in message.extra_tags %}
       <li{% if message.tags %} class="{{ message.tags }}" {% endif %}>
         {{ message }}
         </li>
+        {% endif %}
         {% endfor %}
     </ul>
     {% endif %}

src/registrar/templates/includes/form_errors.html

@@ -1,5 +1,9 @@
+{% comment %}
+Commenting the code below to turn off the error because 
+we are showing the caution dialog instead. But saving in 
+case we want to revert this. 
 {% if form.errors %}
-  {% for error in form.non_field_errors %}
+{% for error in form.non_field_errors %}
     <div class="usa-alert usa-alert--error usa-alert--slim margin-bottom-2">
     <div class="usa-alert__body">
     {{ error|escape }}
@@ -15,4 +19,5 @@
       </div>
     {% endfor %}
   {% endfor %}
-{% endif %}
+{% endif %}
+{% endcomment %}

src/registrar/templates/includes/form_messages.html

@@ -0,0 +1,10 @@
+{% if messages %}
+{% for message in messages %}
+<div class="usa-alert usa-alert--{{ message.tags }} usa-alert--slim margin-bottom-2">
+    <div class="usa-alert__body">
+       {{ message }}
+    </div>
+</div>
+
+{% endfor %}
+{% endif %}

src/registrar/views/application.py

@@ -6,6 +6,8 @@ from django.shortcuts import redirect, render
 from django.urls import resolve, reverse
 from django.utils.translation import gettext_lazy as _
 from django.views.generic import TemplateView
+from django.contrib import messages
+from django.utils.safestring import mark_safe
 
 from registrar.forms import application_wizard as forms
 from registrar.models import DomainApplication
@@ -319,6 +321,16 @@ class ApplicationWizard(LoginRequiredMixin, TemplateView):
             self.save(forms)
         else:
             # unless there are errors
+            # no sec because this use of mark_safe does not introduce a cross-site
+            # scripting vulnerability because there is no untrusted content inside.
+            # It is only being used to pass a specific HTML entity into a template.
+            messages.warning(
+                request,
+                mark_safe(  # nosec
+                    "<b>We could not save all the fields.</b><br/> The highlighted "
+                    + "fields below <b>could not be saved</b> because they have "
+                    + "missing or invalid data. All other information on this page "
+                    + "has been saved."
             context = self.get_context_data()
             context["forms"] = forms
             return render(request, self.template_name, context)
@@ -326,6 +338,7 @@ class ApplicationWizard(LoginRequiredMixin, TemplateView):
         # if user opted to save their progress,
         # return them to the page they were already on
         if button == "save":
+            messages.success(request, "Your progress has been saved!")
             return self.goto(self.steps.current)
         # otherwise, proceed as normal
         return self.goto_next_step()