From c6c983ed73a019027b452b3eaf0ee4b502d38818 Mon Sep 17 00:00:00 2001
From: Divyansh Singh <40380293+brc-dd@users.noreply.github.com>
Date: Sun, 6 Aug 2023 15:42:58 +0530
Subject: [PATCH] fix(client): handle empty hash in links (#2738)

---
 src/client/app/router.ts | 44 +++++++++++++++++++---------------------
 1 file changed, 21 insertions(+), 23 deletions(-)

diff --git a/src/client/app/router.ts b/src/client/app/router.ts
index cbfc9e1460fe..4cbb7af65148 100644
--- a/src/client/app/router.ts
+++ b/src/client/app/router.ts
@@ -74,11 +74,7 @@ export function createRouter(
         href = url.pathname + url.search + url.hash
       }
     }
-    if (inBrowser && href !== location.href) {
-      // save scroll position before changing url
-      history.replaceState({ scrollPosition: window.scrollY }, document.title)
-      history.pushState(null, '', href)
-    }
+    updateHistory(href)
     await loadPage(href)
     await router.onAfterRouteChanged?.(href)
   }
@@ -211,15 +207,18 @@ export function createRouter(
               search === currentUrl.search
             ) {
               // scroll between hash anchors in the same page
+              // avoid duplicate history entries when the hash is same
+              if (hash !== currentUrl.hash) {
+                history.pushState(null, '', hash)
+                // still emit the event so we can listen to it in themes
+                window.dispatchEvent(new Event('hashchange'))
+              }
               if (hash) {
-                // avoid duplicate history entries when the hash is same
-                if (hash !== currentUrl.hash) {
-                  history.pushState(null, '', hash)
-                  // still emit the event so we can listen to it in themes
-                  window.dispatchEvent(new Event('hashchange'))
-                }
                 // use smooth scroll when clicking on header anchor links
                 scrollTo(link, hash, link.classList.contains('header-anchor'))
+              } else {
+                updateHistory(href)
+                window.scrollTo(0, 0)
               }
             } else {
               go(href)
@@ -292,20 +291,11 @@ export function scrollTo(el: Element, hash: string, smooth = false) {
       target.getBoundingClientRect().top -
       offset +
       targetPadding
-    // only smooth scroll if distance is smaller than screen height.
     function scrollToTarget() {
-      if (
-        !smooth ||
-        Math.abs(targetTop - window.scrollY) > window.innerHeight
-      ) {
+      // only smooth scroll if distance is smaller than screen height.
+      if (!smooth || Math.abs(targetTop - window.scrollY) > window.innerHeight)
         window.scrollTo(0, targetTop)
-      } else {
-        window.scrollTo({
-          left: 0,
-          top: targetTop,
-          behavior: 'smooth'
-        })
-      }
+      else window.scrollTo({ left: 0, top: targetTop, behavior: 'smooth' })
     }
     requestAnimationFrame(scrollToTarget)
   }
@@ -338,3 +328,11 @@ function shouldHotReload(payload: PageDataPayload): boolean {
     .slice(siteDataRef.value.base.length - 1)
   return payloadPath === locationPath
 }
+
+function updateHistory(href: string) {
+  if (inBrowser && href !== location.href) {
+    // save scroll position before changing url
+    history.replaceState({ scrollPosition: window.scrollY }, document.title)
+    history.pushState(null, '', href)
+  }
+}