Chore: Template switch to all!

This extension is template-agnostic, it should work with any style since it just injects JavaScript.
In practice, the 'other' templates _may_ not use the "textarea#message" field... and would be broken anyway, so it matters little _where_ they get broken.

Author: GwynethLlewelyn

gwynethllewelyn/postlocalstorage/styles/all/template/custom_functions.js

@@ -0,0 +1,57 @@
+// Copyright (C) 2023 Gwyneth Llewelyn
+//
+// This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+(function (message, doc) {
+	// If there is no localStorage support, give up
+	if (!message.localStorage) return;
+	// phpBB3 uses a textarea with id and name 'message'
+	var textarea = doc.querySelector("textarea#message");
+	// no point in being around if this is nil; also: avoids crashing below (gwyneth 20220303)
+	if (!textarea) return;
+	// The key for the key/value pair in localStorage is the current URL.
+	var key = message.location.href;
+	var item = null;
+	// Use the 'pagehide' event in modern browsers or 'beforeunload' in older browsers.
+	var unloadEvent;
+	if ("onpagehide" in message) {
+		unloadEvent = "pagehide";
+	} else {
+		unloadEvent = "beforeunload";
+	}
+	// If there's a localStorage entry for the current URL, update the textarea with the saved value.
+	item = message.localStorage.getItem(key);
+	if (item) {
+		var data = JSON.parse(item);
+		textarea.value = data.content;
+	}
+	// This function will store the current value of the textarea in localStorage (or delete it if the textarea is blank).
+	function updateStorage() {
+		if (textarea.value) {
+			item = JSON.stringify({ content: textarea.value });
+			message.localStorage.setItem(key, item);
+		} else {
+			message.localStorage.removeItem(key);
+		}
+		// This event listener is no longer needed now so remove it.
+		message.removeEventListener(unloadEvent, updateStorage);
+	}
+	// When the user presses a key just *once* inside the textarea, run the storage function when the page is unloaded.
+	textarea.addEventListener(
+		"keyup",
+		function () {
+			message.addEventListener(unloadEvent, updateStorage);
+			message.setInterval(updateStorage, 10000);
+		},
+		{ once: true }
+	);
+	// When the form is submitted, delete the localStorage key/value pair.
+	textarea.form.addEventListener("submit", function () {
+		message.localStorage.removeItem(key);
+		message.removeEventListener(unloadEvent, updateStorage);
+	});
+})(this, this.document);

gwynethllewelyn/postlocalstorage/styles/all/template/event/overall_footer_after.html

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+{% INCLUDEJS '@gwynethllewelyn_postlocalstorage/custom_functions.js' %}