perf(tpl): save filter on pagehide trigged

Save filter on `pagehide` will make it possible to let browser use
bfcache.

See also: https://web.dev/bfcache/

Author: marjune163

src/tpl/asset/main.js

@@ -101,11 +101,14 @@
 		if (sessionStorage) {
 			var prevSessionFilter = sessionStorage.getItem(location.pathname);
 			sessionStorage.removeItem(location.pathname);
-			window.addEventListener('beforeunload', function () {
+
+			var leavingEvent = typeof window.onpagehide !== 'undefined' ? 'pagehide' : 'beforeunload';
+			window.addEventListener(leavingEvent, function () {
 				if (input.value) {
 					sessionStorage.setItem(location.pathname, input.value);
 				}
 			}, false);
+
 			if (prevSessionFilter) {
 				input.value = prevSessionFilter;
 			}

src/tpl/asset/main.js.go

@@ -93,7 +93,8 @@ break;
 if (sessionStorage) {
 var prevSessionFilter = sessionStorage.getItem(location.pathname);
 sessionStorage.removeItem(location.pathname);
-window.addEventListener('beforeunload', function () {
+var leavingEvent = typeof window.onpagehide !== 'undefined' ? 'pagehide' : 'beforeunload';
+window.addEventListener(leavingEvent, function () {
 if (input.value) {
 sessionStorage.setItem(location.pathname, input.value);
 }