New Extension: Addressbar Updater

Extensions/addressbar.icon.js

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Extensions/addressbar.js

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+//* TITLE Addressbar Updater **//
+//* VERSION 1.0.1 **//
+//* DESCRIPTION Keeps the url in its place **//
+//* DEVELOPER srsutherland **//
+//* DETAILS Sets the url to the current post on your dashboard (to keep your place during tab crashes and refreshes). **//
+//* FRAME false **//
+//* BETA false **//
+//* SLOW false **//
+
+XKit.extensions.addressbar = new Object({
+
+	running: false,
+	interval: 0,
+	initialScroll: history.scrollRestoration,
+
+	preferences: {
+		"focus_only": {
+			text: "Only run the extension when the page has focus",
+			default: true,
+			value: true
+		},
+	},
+
+	run: function() {
+		this.running = true; //there's some confusion over whether this gets set to true on immediate return
+
+		const Xwhere = XKit.interface.where();
+		if (Xwhere.dashboard !== true || Xwhere.endless !== true) {
+			return; //only useful on endless dashboard
+		} 
+
+		this.interval = setInterval(this.update_address, 500);
+
+		history.scrollRestoration = "manual"; //prevent page from jumping to bottom on refresh 
+	},
+
+	find_top: function() {
+		var offset = 200; //place slightly below navbar to ignore reblog controls
+		var scrollPos = $(window).scrollTop() + offset;
+		var minDist = Number.MAX_SAFE_INTEGER;
+		var id = null; //check later and do nothing to history if no post qualifies
+
+		$("[data-id]").each(function() {
+			var dist = scrollPos - $(this).offset().top;
+			//if it equals exactly 200 that's a bogus value
+			if (dist > 0 && dist !== offset && dist < minDist) {
+				minDist = dist;
+				id = $(this).attr('data-id');
+			}
+		});
+		return id;
+	},
+
+	replace_address: function(postid) {
+		postid = BigInt(postid);
+		window.history.replaceState(
+			{ id: postid }, 
+			'Tumblr - ' + postid, //title param is ignored currently
+			'?max_post_id=' + (postid + BigInt(1)) //has to be the id immediately after
+		);
+	},
+
+	update_address: function() {
+		if (!XKit.extensions.addressbar.focus_only || document.hasFocus()) { 
+		//do nothing if you're not in focus
+			var id = XKit.extensions.addressbar.find_top();
+			if (id !== null && id > 1) {
+				XKit.extensions.addressbar.replace_address(id);
+			}
+			return id; //unused/debug
+		}
+	},
+
+	destroy: function() {
+		this.running = false;
+		clearInterval(this.interval);
+		history.scrollRestoration = this.initialScroll;
+	}
+});