From 4cdb4bde6fa9ba8274b69b838ef668a7599f66e8 Mon Sep 17 00:00:00 2001
From: Kuba Orlik <kontakt@kuba-orlik.name>
Date: Sat, 3 Aug 2024 11:58:41 +0200
Subject: [PATCH] Add scroll preserving snippet

---
 src/front/index.ts | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/src/front/index.ts b/src/front/index.ts
index a6c2953..7fb054e 100644
--- a/src/front/index.ts
+++ b/src/front/index.ts
@@ -1 +1,31 @@
 export * from "./controllers.js";
+
+(function enableScrollPreservation() {
+	/* https://github.com/hotwired/turbo/issues/37#issuecomment-1422200868 */
+	Turbo.scrollTop = 0;
+
+	Turbo.shouldPreserveScroll = false;
+
+	let shouldPreserveScroll = 0;
+
+	document.addEventListener("turbo:click", function (event) {
+		if (event.target.hasAttribute("data-turbo-preserve-scroll")) {
+			shouldPreserveScroll = true;
+		} else {
+			shouldPreserveScroll = false;
+		}
+	});
+
+	document.addEventListener("turbo:visit", function (event) {
+		if (shouldPreserveScroll) {
+			Turbo.scrollTop = document.documentElement.scrollTop;
+		} else {
+			Turbo.scrollTop = 0;
+		}
+	});
+
+	addEventListener("turbo:visit", () => {
+		Turbo.navigator.currentVisit.scrolled = true;
+		document.documentElement.scrollTop = Turbo.scrollTop;
+	});
+})();