MOBILE-4251 Feedback: Avoid displaying the preview button to students

scripts/langindex.json

@@ -2105,6 +2105,7 @@
   "core.nopasswordchangeforced": "local_moodlemobileapp",
   "core.nopermissionerror": "local_moodlemobileapp",
   "core.nopermissions": "error",
+  "core.nopermissiontoaccesspage": "error",
   "core.noresults": "moodle",
   "core.noselection": "form",
   "core.notapplicable": "local_moodlemobileapp",

src/addons/mod/feedback/components/index/addon-mod-feedback-index.html

@@ -36,7 +36,7 @@
 
     <div collapsible-footer *ngIf="!showLoading" slot="fixed">
         <div class="list-item-limited-width adaptable-buttons-row"
-            *ngIf="access && (access.canedititems || access.canviewreports || !access.isempty)">
+            *ngIf="access && !access.isempty && (access.canedititems || access.canviewreports)">
             <ion-button expand="block" fill="outline" (click)="gotoAnswerQuestions(true)" class="ion-margin ion-text-wrap">
                 <ion-icon name="fas-search" slot="start" aria-hidden="true"></ion-icon>
                 {{ 'addon.mod_feedback.preview' | translate }}

src/addons/mod/feedback/pages/form/form.ts

@@ -109,6 +109,14 @@ export class AddonModFeedbackFormPage implements OnInit, OnDestroy, CanLeave {
 
         await this.fetchData();
 
+        if (!this.access || this.access.isempty || (!this.access.canedititems && !this.access.canviewreports)) {
+            CoreDomUtils.showErrorModal(Translate.instant('core.nopermissiontoaccesspage'));
+
+            CoreNavigator.back();
+
+            return;
+        }
+
         if (!this.feedback) {
             return;
         }

src/core/lang.json

@@ -214,6 +214,7 @@
     "nopasswordchangeforced": "You cannot proceed without changing your password.",
     "nopermissionerror": "Sorry, but you do not currently have permissions to do that",
     "nopermissions": "Sorry, but you do not currently have permissions to do that ({{$a}}).",
+    "nopermissiontoaccesspage": "You don't have permission to access this page.",
     "noresults": "No results",
     "noselection": "No selection",
     "notapplicable": "n/a",