MDL-73376 qbank_comment: Version selection in modal

This commit implements version selection in the comment
modal to allow users to change the version of question
using that dropdown.

lang/en/question.php

@@ -498,6 +498,8 @@
 $string['qbanknotfound'] = 'The \'{$a}\' question bank plugin doesn\'t exist or is not recognised.';
 $string['noquestionbanks'] = 'No question bank plugin found.';
 $string['questionloaderror'] = 'Could not load the question options.';
+$string['version_selection'] = 'Version {$a->version}';
+$string['question_version'] = 'Question version';
 
 // Deprecated since Moodle 4.0.
 $string['notflagged'] = 'Not flagged';

question/bank/comment/amd/src/comment.js

@@ -39,13 +39,13 @@ import Notification from 'core/notification';
 const commentEvent = (questionId, courseID, contextId) => {
     let args = {
         questionid: questionId,
-        courseid: courseID
+        courseid: courseID,
+        uniqueidentifier: 'question_comment_version_dropdown'
     };
-    let commentFragment = Fragment.loadFragment('qbank_comment', 'question_comment', contextId, args);
     ModalFactory.create({
         type: ModalFactory.types.SAVE_CANCEL,
         title: Str.get_string('commentheader', 'qbank_comment'),
-        body: commentFragment,
+        body: Fragment.loadFragment('qbank_comment', 'question_comment', contextId, args),
         large: true,
     }).then((modal) => {
         let root = modal.getRoot();
@@ -56,6 +56,12 @@ const commentEvent = (questionId, courseID, contextId) => {
             submitlink.style.display = 'none';
         });
 
+        // Version selection event.
+        root.on('change', '#question_comment_version_dropdown', function(e) {
+            args.questionid = e.target.value;
+            modal.setBody(Fragment.loadFragment('qbank_comment', 'question_comment', contextId, args));
+        });
+
         // Get the required strings and updated the modal button text labels.
         Str.get_strings([
             {key: 'addcomment', component: 'qbank_comment'},

question/bank/comment/lib.php

@@ -109,6 +109,9 @@ function qbank_comment_preview_display($question, $courseid): string {
  * @return string rendered output
  */
 function qbank_comment_output_fragment_question_comment($args): string {
+    if (!$args['questionid'] || !$args['uniqueidentifier']) {
+        return '';
+    }
     global $USER, $PAGE, $CFG, $DB;
     $displaydata = [];
     require_once($CFG->dirroot . '/question/engine/bank.php');
@@ -133,5 +136,9 @@ function qbank_comment_output_fragment_question_comment($args): string {
         $displaydata['commenstdisabled'] = true;
     }
 
+    $selector = \core_question\output\question_version_selection::make_for_question($args['uniqueidentifier'], $args['questionid']);
+    $qbankrenderer = $PAGE->get_renderer('core_question', 'bank');
+    $displaydata['versionselection'] = $selector->export_for_template($qbankrenderer);
+
     return $PAGE->get_renderer('qbank_comment')->render_comment_fragment($displaydata);
 }