From 8e6cb290be22b01c42d1ab4c0a36447c9815c670 Mon Sep 17 00:00:00 2001
From: Aleksey Novikov <novikov82@gmail.com>
Date: Tue, 16 Apr 2024 16:31:24 +0300
Subject: [PATCH] fixed siglepage mode preview fail for dynamic panel (#8122)

---
 src/panel.ts         |  2 +-
 tests/surveytests.ts | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/src/panel.ts b/src/panel.ts
index fdc9394c0f..0399c39247 100644
--- a/src/panel.ts
+++ b/src/panel.ts
@@ -2073,7 +2073,7 @@ export class PanelModel extends PanelModelBase implements IElement {
     return super.getIsNested() && this.parent !== undefined;
   }
   public get showPanelAsPage(): boolean {
-    return !!(<any>this).originalPage || (<any>this.survey).isShowingPreview && (<any>this.survey).isSinglePage && !!(<any>this).parent.originalPage;
+    return !!(<any>this).originalPage || (<any>this.survey).isShowingPreview && (<any>this.survey).isSinglePage && !!(<any>this).parent && !!(<any>this).parent.originalPage;
   }
   protected getCssRoot(cssClasses: { [index: string]: string }): string {
     return new CssClassBuilder()
diff --git a/tests/surveytests.ts b/tests/surveytests.ts
index 349e001c8e..f9be5225d7 100644
--- a/tests/surveytests.ts
+++ b/tests/surveytests.ts
@@ -19544,3 +19544,37 @@ QUnit.test("showPreview & updateProgress & updateVisibleIndexes", function (
   assert.equal(progressCounter, 1, "progressCounter");
   assert.equal(visibleChangedCounter, 0, "visibleChangedCounter");
 });
+
+QUnit.test("showPreview & dynamic panel? single page", function (
+  assert
+) {
+  const survey = new SurveyModel({
+    "pages": [
+      {
+        "name": "page1",
+        "elements": [
+          {
+            "type": "paneldynamic",
+            "name": "question1",
+            "defaultValue": [
+              {
+                "question2": "q"
+              }
+            ],
+            "templateElements": [
+              {
+                "type": "text",
+                "name": "question2"
+              }
+            ]
+          }
+        ]
+      }
+    ],
+    "questionsOnPageMode": "singlePage",
+    "showPreviewBeforeComplete": "showAllQuestions"
+  });
+  survey.showPreview();
+  assert.notOk((survey.getQuestionByName("question1") as QuestionPanelDynamicModel).panels[0].showPanelAsPage);
+});
+