From 0e684379ea05c7cea098612d620f01be70954b89 Mon Sep 17 00:00:00 2001
From: Jason Miller <jason@developit.ca>
Date: Mon, 17 Apr 2017 20:18:47 -0400
Subject: [PATCH] A working relative links implementation (with test) that only
 accounts for links in a document (not `route("./foo")`). See #138.

---
 src/index.js | 27 +++++++++------------------
 test/dom.js  | 16 ++++++++++++++++
 2 files changed, 25 insertions(+), 18 deletions(-)

diff --git a/src/index.js b/src/index.js
index 868b190c..8b796f7b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -79,17 +79,11 @@ function routeTo(url) {
 
 
 function routeFromLink(node) {
-	// only valid elements
-	if (!node || !node.getAttribute) return;
-
-	let href = node.getAttribute('href'),
-		target = node.getAttribute('target');
-
-	// ignore links with targets and non-path URLs
-	if (!href || !href.match(/^\//g) || (target && !target.match(/^_?self$/i))) return;
+	// ignore invalid & external links:
+	if (!node || node.protocol!==location.protocol || node.host!==location.host || (node.target && !node.target.match(/^_?self$/i))) return;
 
 	// attempt to route, if no match simply cede control to browser
-	return route(href);
+	return route(node.pathname + node.search + node.hash);
 }
 
 
@@ -117,12 +111,9 @@ function delegateLinkHandler(e) {
 
 	let t = e.target;
 	do {
-		if (String(t.nodeName).toUpperCase()==='A' && t.getAttribute('href') && isPreactElement(t)) {
-			if (t.hasAttribute('native')) return;
+		if (String(t.nodeName).toUpperCase()==='A' && t.pathname && isPreactElement(t) && !t.hasAttribute('native') && routeFromLink(t)) {
 			// if link is handled by the router, prevent browser defaults
-			if (routeFromLink(t)) {
-				return prevent(e);
-			}
+			return prevent(e);
 		}
 	} while ((t=t.parentNode));
 }
@@ -131,13 +122,13 @@ function delegateLinkHandler(e) {
 let eventListenersInitialized = false;
 
 function initEventListeners() {
-	if (eventListenersInitialized){
-		return;
-	}
+	if (eventListenersInitialized) return;
 
 	if (typeof addEventListener==='function') {
 		if (!customHistory) {
-			addEventListener('popstate', () => routeTo(getCurrentUrl()));
+			addEventListener('popstate', () => {
+				routeTo(getCurrentUrl());
+			});
 		}
 		addEventListener('click', delegateLinkHandler);
 	}
diff --git a/test/dom.js b/test/dom.js
index 5687a832..c55312dc 100644
--- a/test/dom.js
+++ b/test/dom.js
@@ -170,6 +170,22 @@ describe('dom', () => {
 			route('/foo');
 			expect(routerRef.base.outerHTML).to.eql('<p>bar is </p>');
 		});
+		
+		it('should support relative links', () => {
+			class A {
+				render() {
+					return <a href="two">go</a>;
+				}
+			}
+			history.replaceState(null, null, '/foo/one');
+			mount(
+				<Router>
+					<A default />
+				</Router>
+			);
+			scratch.querySelector('a').click();
+			expect(location.pathname).to.equal('/foo/two');
+		});
 	});
 	
 	describe('preact-router/match', () => {