Rewrite confirmation modals (#1985)

This removes our Django template `confirmation_modal.html` and instead provides the `confirmation-modal` custom element. The new modal is used like a submit button for HTML forms. Alternatively, if a modal does not have an associated form, it will dispatch a custom "confirmed" event on itself.

Additionally, I added "custom-success" forms. By specifying the `custom-success` tag on an HTML form, the form will not use the default behavior when a submit is requested, but instead submit the form data with `fetch` and dispatch a custom event afterwards. One common use case is making a form reload the current site on success - this way, we don't need the views to know what sites usually request it. I added the `reload-on-success` tag for this special case.

I changed all confirmation modals, except for the delegation modal on the contributor index site. This modal was already a special case before and we can port it later.

evap/contributor/templates/contributor_evaluation_form.html

@@ -92,9 +92,18 @@ <h5 class="card-title me-auto">{% trans 'Evaluation data' %}</h5>
                 {% if editable %}
                     <button name="operation" value="preview" type="submit" class="btn btn-light">{% trans 'Preview' %}</button>
                     <button name="operation" value="save" type="submit" class="btn btn-primary">{% trans 'Save' %}</button>
-                    {# webtest does not allow submission with value "approve" if no such button exists #}
-                    <button style="display: none" name="operation" value="approve" type="submit"></button>
-                    <button type="button" onclick="approveEvaluationModalShow(0, '');" class="btn btn-success">{% trans 'Save and approve' %}</button>
+
+                    <confirmation-modal type="submit" name="operation" value="approve">
+                        <span slot="title">{% trans 'Approve evaluation' %}</span>
+                        <span slot="action-text">{% trans 'Approve evaluation' %}</span>
+                        <span slot="question">
+                            {% blocktrans trimmed %}
+                                Do you want to approve this evaluation? This will allow the evaluation team to proceed with the preparation, but you won't be able to make any further changes.
+                            {% endblocktrans %}
+                        </span>
+
+                        <button slot="show-button" type="button" class="btn btn-success">{% trans 'Save and approve' %}</button>
+                    </confirmation-modal>
                 {% endif %}
                 <a href="{% url 'contributor:index' %}" class="btn btn-light">{% if edit %}{% trans 'Cancel' %}{% else %}{% trans 'Back' %}{% endif %}</a>
             </div>
@@ -123,22 +132,6 @@ <h5 class="modal-title" id="previewModalLabel">{% trans 'Preview' %}</h5>
 
 {% block modals %}
     {{ block.super }}
-    {% trans 'Approve evaluation' as title %}
-    {% blocktrans asvar question%}Do you want to approve this evaluation? This will allow the evaluation team to proceed with the preparation, but you won't be able to make any further changes.{% endblocktrans %}
-    {% trans 'Approve evaluation' as action_text %}
-    {% include 'confirmation_modal.html' with modal_id='approveEvaluationModal' title=title question=question action_text=action_text btn_type='primary' %}
-    <script type="text/javascript">
-        function approveEvaluationModalAction(dataId) {
-            const input = document.createElement("input");
-            input.type = "hidden";
-            input.name = "operation";
-            input.value = "approve";
-
-            const form = document.getElementById("evaluation-form");
-            form.appendChild(input);
-            form.requestSubmit();
-        };
-    </script>
 
     {% blocktrans asvar title with evaluation_name=evaluation.full_name %}Request account creation for {{ evaluation_name }}{% endblocktrans %}
     {% trans 'Please tell us which new account we should create. We need the name and email for all new accounts.' as teaser %}

evap/contributor/templates/contributor_index.html

@@ -157,12 +157,13 @@
                                                         <span class="fas fa-pencil"></span>
                                                     </a>
                                                     {% if not evaluation|has_nonresponsible_editor %}
-                                                        <a href="#" class="btn btn-sm btn-dark" data-bs-toggle="tooltip"
+                                                        <button class="btn btn-sm btn-dark" data-bs-toggle="tooltip"
                                                             data-bs-placement="top" title="{% trans 'Delegate preparation' %}"
-                                                            onclick="delegateSelectionModalShow(`{{ evaluation.full_name }}`, `{% url 'contributor:evaluation_direct_delegation' evaluation.id %}`);return false;"
+                                                            data-evaluation-name="{{ evaluation.full_name }}"
+                                                            data-delegation-url="{% url 'contributor:evaluation_direct_delegation' evaluation.id %}"
                                                         >
                                                             <span class="fas fa-hand-point-left"></span>
-                                                        </a>
+                                                        </button>
                                                     {% endif %}
                                                 {% elif evaluation.state == evaluation.State.EDITOR_APPROVED or evaluation.state == evaluation.State.APPROVED %}
                                                     <a href="{% url 'contributor:evaluation_view' evaluation.id %}" class="btn btn-sm btn-light"
@@ -226,22 +227,26 @@ <h5 class="modal-title" id="{{ modal_id }}Label">{% trans 'Delegate preparation'
             </div>
         </div>
 
-        <script type="text/javascript">
-            function {{ modal_id }}Show(evaluationName, action) {
-                const modal = document.getElementById("{{ modal_id }}");
-                // set form's action location
-                modal.querySelectorAll("form").forEach(form => form.action = action);
+        <script type="module">
+            document.querySelectorAll("[data-evaluation-name][data-delegation-url]").forEach(showButton => {
+                showButton.addEventListener("click", event => {
+                    event.stopPropagation();
 
-                // put the correct evaluation name in the modal
-                modal.querySelectorAll('[data-label=""]').forEach(el => el.innerText = evaluationName);
+                    const modal = document.getElementById("{{ modal_id }}");
+                    // set form's action location
+                    modal.querySelectorAll("form").forEach(form => form.action = showButton.dataset.delegationUrl);
 
-                // unselect any previously selected options in the modal
-                modal.querySelectorAll("select").forEach(select => select.tomselect.clear());
+                    // put the correct evaluation name in the modal
+                    modal.querySelectorAll('[data-label=""]').forEach(el => el.innerText = showButton.dataset.evaluationName);
 
-                // show modal
-                var {{ modal_id }} = new bootstrap.Modal(document.getElementById('{{ modal_id }}'));
-                {{ modal_id }}.show();
-            }
+                    // unselect any previously selected options in the modal
+                    modal.querySelectorAll("select").forEach(select => select.tomselect.clear());
+
+                    // show modal
+                    var {{ modal_id }} = new bootstrap.Modal(document.getElementById('{{ modal_id }}'));
+                    {{ modal_id }}.show();
+                });
+            });
         </script>
     {% endwith %}
 {% endblock %}

evap/contributor/tests/test_views.py

@@ -5,7 +5,12 @@
 from model_bakery import baker
 
 from evap.evaluation.models import Contribution, Course, Evaluation, Questionnaire, UserProfile
-from evap.evaluation.tests.tools import WebTestWith200Check, create_evaluation_with_responsible_and_editor, render_pages
+from evap.evaluation.tests.tools import (
+    WebTestWith200Check,
+    create_evaluation_with_responsible_and_editor,
+    render_pages,
+    submit_with_modal,
+)
 
 
 class TestContributorDirectDelegationView(WebTest):
@@ -197,7 +202,7 @@ def test_contributor_evaluation_edit(self):
         self.evaluation = Evaluation.objects.get(pk=self.evaluation.pk)
         self.assertEqual(self.evaluation.state, Evaluation.State.PREPARED)
 
-        form.submit(name="operation", value="approve")
+        submit_with_modal(page, form, name="operation", value="approve")
         self.evaluation = Evaluation.objects.get(pk=self.evaluation.pk)
         self.assertEqual(self.evaluation.state, Evaluation.State.EDITOR_APPROVED)
 

evap/evaluation/templates/base.html

@@ -28,6 +28,8 @@
     <body>
         <script type="text/javascript" src="{% static 'bootstrap/dist/js/bootstrap.bundle.min.js' %}"></script>
 
+        {% include "custom_elements.html" %}
+
         {% block modals %}
             {% if user.is_authenticated %}
                 {% trans 'Feedback' as title %}
@@ -199,6 +201,12 @@
 
         </script>
 
+        <script type="module">
+            import { setupForms } from "{% static 'js/custom-success-form.js' %}";
+
+            setupForms();
+        </script>
+
         {% block additional_javascript %}{% endblock %}
     </body>
 </html>

evap/evaluation/templates/confirmation_modal_template.html

@@ -0,0 +1,33 @@
+{% load static %}
+
+<template id="confirmation-modal-template">
+    <link rel="stylesheet" href="{% static 'css/evap.css' %}" />
+
+    <dialog class="evap-modal-dialog">
+        <form method="dialog">
+            <div class="evap-modal-container">
+                <header>
+                    <h5 class="mb-0"><slot name="title"></slot></h5>
+                    <button class="btn-close"></button>
+                </header>
+                <section class="question-area">
+                    <slot name="question"></slot>
+                    <slot name="extra-inputs"></slot>
+                </section>
+                <section class="button-area">
+                    <button class="btn btn-light" autofocus>{% trans 'Cancel' %}</button>
+                    <slot name="submit-group">
+                        <button class="btn ms-2" data-event-type="confirm">
+                            <slot name="action-text"></slot>
+                        </button>
+                    </slot>
+                </section>
+            </div>
+        </form>
+    </dialog>
+
+    <slot name="show-button"></slot>
+
+    {# All children without the "slot" attribute go into this unnamed slot #}
+    <slot></slot>
+</template>

evap/evaluation/templates/custom_elements.html

@@ -0,0 +1,9 @@
+{% load static %}
+
+{% include "confirmation_modal_template.html" %}
+
+<script type="module">
+    import { ConfirmationModal } from "{% static 'js/confirmation-modal.js' %}";
+
+    customElements.define("confirmation-modal", ConfirmationModal);
+</script>

evap/evaluation/tests/test_misc.py

@@ -9,7 +9,7 @@
 from model_bakery import baker
 
 from evap.evaluation.models import CourseType, Degree, Semester, UserProfile
-from evap.evaluation.tests.tools import make_manager
+from evap.evaluation.tests.tools import make_manager, submit_with_modal
 from evap.staff.tests.utils import WebTestStaffMode
 
 
@@ -36,7 +36,7 @@ def test_sample_semester_file(self):
         form = page.forms["semester-import-form"]
         form["vote_start_datetime"] = "2015-01-01 11:11:11"
         form["vote_end_date"] = "2099-01-01"
-        form.submit(name="operation", value="import")
+        submit_with_modal(page, form, name="operation", value="import")
 
         self.assertEqual(UserProfile.objects.count(), original_user_count + 4)
 
@@ -50,7 +50,7 @@ def test_sample_user_file(self):
         page = form.submit(name="operation", value="test")
 
         form = page.forms["user-import-form"]
-        form.submit(name="operation", value="import")
+        submit_with_modal(page, form, name="operation", value="import")
 
         self.assertEqual(UserProfile.objects.count(), original_user_count + 2)
 

evap/evaluation/tests/tools.py

@@ -4,6 +4,7 @@
 from contextlib import contextmanager
 from datetime import timedelta
 
+import webtest
 from django.conf import settings
 from django.contrib.auth.models import Group
 from django.db import DEFAULT_DB_ALIAS, connections
@@ -125,6 +126,14 @@ def test_check_response_code_200(self):
             self.app.get(self.url, user=user, status=200)
 
 
+def submit_with_modal(page: webtest.TestResponse, form: webtest.Form, *, name: str, value: str) -> webtest.TestResponse:
+    # Like form.submit, but looks for a modal instead of a submit button.
+    assert page.forms[form.id] == form
+    assert page.html.select_one(f"confirmation-modal[type=submit][name={name}][value={value}]")
+    params = form.submit_fields() + [(name, value)]
+    return form.response.goto(form.action, method=form.method, params=params)
+
+
 def get_form_data_from_instance(form_cls, instance, **kwargs):
     assert form_cls._meta.model == type(instance)
     form = form_cls(instance=instance, **kwargs)

evap/grades/templates/grades_course_view.html

@@ -11,6 +11,10 @@ <h3 class="mb-3">{{ course.name }} ({{ semester.name }})</h3>
         </div>
         <div class="card-body table-responsive">
             {% if grade_documents %}
+                <form id="grade-document-deletion-form" custom-success method="POST" action="{% url 'grades:delete_grades' %}">
+                    {% csrf_token %}
+                </form>
+
                 <table class="table table-striped table-vertically-aligned">
                     <thead>
                         <tr>
@@ -22,23 +26,39 @@ <h3 class="mb-3">{{ course.name }} ({{ semester.name }})</h3>
                     </thead>
                     <tbody>
                         {% for grade_document in grade_documents %}
-                            <tr id="grade_document-row-{{ grade_document.id }}">
+                            <tr id="grade-document-row-{{ grade_document.id }}">
                                 <td>{{ grade_document.description }}</td>
                                 <td>{{ grade_document.get_type_display }}</td>
                                 <td>{{ grade_document.last_modified_time }}, {% trans 'by' %} {{ grade_document.last_modified_user }}</td>
                                 <td>
                                     <a href="{% url 'grades:download_grades' grade_document.id %}" class="btn btn-sm btn-light" data-bs-toggle="tooltip" data-bs-placement="top" title="{% trans 'Download' %}"><span class="fas fa-download"></span></a>
                                     {% if user.is_grade_publisher %}
                                         <a href="{% url 'grades:edit_grades' grade_document.id %}" class="btn btn-sm btn-light" data-bs-toggle="tooltip" data-bs-placement="top" title="{% trans 'Edit' %}"><span class="fas fa-pencil"></span></a>
-                                        <button type="button" onclick="deleteGradedocumentModalShow({{ grade_document.id }}, '{{ grade_document.description|escapejs }}');" class="btn btn-sm btn-danger" data-bs-toggle="tooltip" data-bs-placement="top" title="{% trans 'Delete' %}">
-                                            <span class="fas fa-trash"></span>
-                                        </button>
+                                        <confirmation-modal type="submit" form="grade-document-deletion-form" name="grade_document_id" value="{{ grade_document.id }}" confirm-button-class="btn-danger">
+                                            <span slot="title">{% trans 'Delete grade document' %}</span>
+                                            <span slot="action-text">{% trans 'Delete grade document' %}</span>
+                                            <span slot="question">
+                                                {% blocktrans trimmed with description=grade_document.description %}
+                                                    Do you really want to delete the grade document <strong>{{ description }}</strong>?
+                                                {% endblocktrans %}
+                                            </span>
+
+                                            <button slot="show-button" type="button" class="btn btn-sm btn-danger" data-bs-toggle="tooltip" data-bs-placement="top" title="{% trans 'Delete' %}">
+                                                <span class="fas fa-trash"></span>
+                                            </button>
+                                        </confirmation-modal>
                                     {% endif %}
                                 </td>
                             </tr>
                         {% endfor %}
                     </tbody>
                 </table>
+
+                <script type="module">
+                    document.getElementById("grade-document-deletion-form").addEventListener("submit-success", event => {
+                        fadeOutThenRemove(document.getElementById(`grade-document-row-${event.detail.body.get("grade_document_id")}`));
+                    });
+                </script>
             {% else %}
                 <span class="fst-italic">{% trans 'No grade documents have been uploaded yet' %}</span>
             {% endif %}
@@ -49,23 +69,3 @@ <h3 class="mb-3">{{ course.name }} ({{ semester.name }})</h3>
         <a href="{% url 'grades:upload_grades' course.id %}?final=true" class="btn btn-dark">{% trans 'Upload new final grades' %}</a>
     {% endif %}
 {% endblock %}
-
-{% block modals %}
-    {{ block.super }}
-    {% trans 'Delete grade document' as title %}
-    {% trans 'Do you really want to delete the grade document <strong data-label=""></strong>?' as question %}
-    {% trans 'Delete grade document' as action_text %}
-    {% include 'confirmation_modal.html' with modal_id='deleteGradedocumentModal' title=title question=question action_text=action_text btn_type='danger' %}
-    <script type="text/javascript">
-        function deleteGradedocumentModalAction(dataId) {
-            fetch("{% url 'grades:delete_grades' %}", {
-                body: new URLSearchParams({grade_document_id: dataId}),
-                headers: CSRF_HEADERS,
-                method: "POST",
-            }).then(response => {
-                assert(response.ok);
-                fadeOutThenRemove(document.getElementById('grade_document-row-'+dataId));
-            }).catch(error => {window.alert("{% trans 'The server is not responding.' %}");});
-        };
-    </script>
-{% endblock %}