From 8082779b1dad128da066248be21bc7e2221a6e79 Mon Sep 17 00:00:00 2001
From: Gabriel Jenik <gabriel.jenik@gmail.com>
Date: Mon, 25 Apr 2022 14:20:55 -0300
Subject: [PATCH] Fixed issue #18026: Session expire message when submit button
 is clicked twice (#2353)

---
 assets/packages/limesurvey/survey.js | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/assets/packages/limesurvey/survey.js b/assets/packages/limesurvey/survey.js
index d232424c530..fba5f0db08b 100644
--- a/assets/packages/limesurvey/survey.js
+++ b/assets/packages/limesurvey/survey.js
@@ -404,4 +404,28 @@ function resetQuestionTimers(sid) {
         window.localStorage.removeItem('limesurvey_timers_' + timersessionname);
     });
     window.localStorage.removeItem(surveyTimersItemName);
-}
\ No newline at end of file
+}
+
+/**
+ * Disable submit button to prevent multiple submits
+ * This is done on 'document' instead of the '#limesurvey' form in order to allow
+ * other scripts (custom themes?) to cancel the submit before we disable the button.
+ */
+ $(document).on('submit', function (e) {
+    // If the target is not the '#limesurvey' form, don't do anything.
+    if (e.target.id != 'limesurvey') {
+        return;
+    }
+    // We only care about the final submit, not normal forward/backward navigation.
+    var submitter = $(e.originalEvent.submitter);
+    if (submitter.attr('value') != 'movesubmit') {
+        return;
+    }
+    // Still, we disable all submit buttons to make sure the "back" button is not
+    // pressed while submitting.
+    $('#limesurvey button[type="submit"]').prop('disabled', true);
+
+    // We also add a hidden input with the button's value, because it's not included
+    // in the request when the button is disabled.
+    $('#limesurvey').append('<input id="onsubmitbuttoninput" name=\'' + submitter.attr('name') + '\' value=\'' + submitter.attr('value') + '\' type=\'hidden\' />');
+});
\ No newline at end of file