From a339ad74bd891f2fbdecce6fb3f1784ff207f1da Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Fri, 3 Nov 2023 13:49:24 -0400
Subject: [PATCH] index.html.in: display a special error message if origin ==
 destination

---
 index.html.in | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/index.html.in b/index.html.in
index ac8b2be..50131b7 100644
--- a/index.html.in
+++ b/index.html.in
@@ -830,7 +830,11 @@
           x.setCustomValidity('');
         })
 
-        if (compute_marc_zone(src.value, dest.value) === null) {
+        if (src.value === dest.value) {
+          let err = "Origin and destination are the same!";
+          dest.setCustomValidity(err);
+        }
+        else if (compute_marc_zone(src.value, dest.value) === null) {
           let err = "Origin and destination are on different lines!";
           dest.setCustomValidity(err);
         }
-- 
2.43.2