Ensure webwork js on assignment pages even using pretext templates

bases/rsptx/assignment_server_api/routers/student.py

@@ -1008,6 +1008,11 @@ async def doAssignment(
         del course_attrs["ptx_js_version"]
     else:
         ptx_js_version = "0.2"
+    # A book built without WeBWorK does not load pretext-webwork.js in its
+    # generated _base.html, but an assignment may include WeBWorK questions
+    # borrowed from another book.  Let the template know it must load the
+    # WeBWorK support itself in that case.
+    needs_webwork = any(q["question_type"] == "webwork" for q in questionslist)
     context = dict(  # This is all the variables that will be used in the doAssignment.html document
         course=course,
         request=request,
@@ -1036,6 +1041,7 @@ async def doAssignment(
         enforce_pastdue=enforce_pastdue,
         ptx_js_version=ptx_js_version,
         webwork_js_version=webwork_js_version,
+        needs_webwork=needs_webwork,
         latex_preamble_dict=preambles,
         wp_imports=get_webpack_static_imports(course),
         settings=settings,

components/rsptx/templates/assignment/student/doAssignment.html

@@ -14,6 +14,31 @@
     {% if origin == "PreTeXt" and using_ptx_base != "true" %}
     <link href="/ns/books/published/{{ course.base_course }}/_static/pretext/css/theme.css" rel="stylesheet" />
     {% endif %}
+
+    {# A book built without WeBWorK does not load pretext-webwork.js in its
+       generated _base.html, so an assignment that borrows WeBWorK questions
+       from another book has no handleWW() to activate them.  Load the support
+       here when the assignment needs it and nothing upstream supplied it.
+       handleWW() is only reached from the Activate button's onclick, so the
+       injected scripts have until the first click to arrive. #}
+    {% if needs_webwork %}
+    <script>
+        (function () {
+            var load = function (src) {
+                var s = document.createElement("script");
+                s.src = src;
+                document.head.appendChild(s);
+            };
+            if (typeof handleWW === "undefined") {
+                load("/ns/books/published/{{ course.course_name }}/_static/pretext/js/dist/pretext-webwork.js");
+            }
+            // handleWW() calls iFrameResize() on the problem iframe.
+            if (typeof iFrameResize === "undefined") {
+                load("https://webwork.runestone.academy/webwork2_files/node_modules/iframe-resizer/js/iframeResizer.min.js");
+            }
+        })();
+    </script>
+    {% endif %}
 {% endblock %}