From df3e7f7815563240c0d52829803cdcf32c7e3473 Mon Sep 17 00:00:00 2001
From: Stephan Rauh <3045767+stephanrauh@users.noreply.github.com>
Date: Wed, 22 Nov 2023 22:37:02 +0100
Subject: [PATCH] #1920 fixed the bug that every checkbox was initially checked
 in many PDF forms

---
 src/display/annotation_layer.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/display/annotation_layer.js b/src/display/annotation_layer.js
index 90bb760341dcc7..fb878b92832f7c 100644
--- a/src/display/annotation_layer.js
+++ b/src/display/annotation_layer.js
@@ -1526,7 +1526,7 @@ class CheckboxWidgetAnnotationElement extends WidgetAnnotationElement {
         : formValue;
     // #1737, #1887 end of modification by ngx-extended-pdf-viewer
     let updateAngularValueNecessary = false;
-    if (typeof value === "string" || angularData !== formValue) {
+    if (typeof value === "string" || (!!angularData?.value && angularData?.value !== formValue)) {
       // The value has been changed through js and set in annotationStorage.
       value = value !== "Off";
       storage.setValue(id, { value });