Fixed replacement of skip link and announcement bar on instant load

material/assets/manifest.json

@@ -1,10 +1,10 @@
 {
-  "assets/javascripts/bundle.js": "assets/javascripts/bundle.edc2ff56.min.js",
-  "assets/javascripts/bundle.js.map": "assets/javascripts/bundle.edc2ff56.min.js.map",
+  "assets/javascripts/bundle.js": "assets/javascripts/bundle.0ddca959.min.js",
+  "assets/javascripts/bundle.js.map": "assets/javascripts/bundle.0ddca959.min.js.map",
   "assets/javascripts/vendor.js": "assets/javascripts/vendor.c1fcc1cc.min.js",
   "assets/javascripts/vendor.js.map": "assets/javascripts/vendor.c1fcc1cc.min.js.map",
   "assets/javascripts/worker/search.js": "assets/javascripts/worker/search.3bc815f0.min.js",
   "assets/javascripts/worker/search.js.map": "assets/javascripts/worker/search.3bc815f0.min.js.map",
-  "assets/stylesheets/main.css": "assets/stylesheets/main.b32d3181.min.css",
+  "assets/stylesheets/main.css": "assets/stylesheets/main.c1451e9e.min.css",
   "assets/stylesheets/palette.css": "assets/stylesheets/palette.4444686e.min.css"
 }

material/base.html

@@ -41,7 +41,7 @@
       {% endif %}
     {% endblock %}
     {% block styles %}
-      <link rel="stylesheet" href="{{ 'assets/stylesheets/main.b32d3181.min.css' | url }}">
+      <link rel="stylesheet" href="{{ 'assets/stylesheets/main.c1451e9e.min.css' | url }}">
       {% if palette.primary or palette.accent %}
         <link rel="stylesheet" href="{{ 'assets/stylesheets/palette.4444686e.min.css' | url }}">
       {% endif %}
@@ -88,19 +88,23 @@
     <input class="md-toggle" data-md-toggle="drawer" type="checkbox" id="__drawer" autocomplete="off">
     <input class="md-toggle" data-md-toggle="search" type="checkbox" id="__search" autocomplete="off">
     <label class="md-overlay" for="__drawer"></label>
-    {% if page.toc | first is defined %}
-      {% set skip = page.toc | first %}
-      <a href="{{ skip.url | url }}" class="md-skip" data-md-component="skip">
-        {{ lang.t('skip.link.title') }}
-      </a>
-    {% endif %}
-    {% if self.announce() %}
-      <aside class="md-announce" data-md-component="announce">
-        <div class="md-announce__inner md-grid md-typeset">
-          {% block announce %}{% endblock %}
-        </div>
-      </aside>
-    {% endif %}
+    <div data-md-component="skip">
+      {% if page.toc | first is defined %}
+        {% set skip = page.toc | first %}
+        <a href="{{ skip.url | url }}" class="md-skip">
+          {{ lang.t('skip.link.title') }}
+        </a>
+      {% endif %}
+    </div>
+    <div data-md-component="announce">
+      {% if self.announce() %}
+        <aside class="md-announce">
+          <div class="md-announce__inner md-grid md-typeset">
+            {% block announce %}{% endblock %}
+          </div>
+        </aside>
+      {% endif %}
+    </div>
     {% block header %}
       {% include "partials/header.html" %}
     {% endblock %}
@@ -175,7 +179,7 @@
     </div>
     {% block scripts %}
       <script src="{{ 'assets/javascripts/vendor.c1fcc1cc.min.js' | url }}"></script>
-      <script src="{{ 'assets/javascripts/bundle.edc2ff56.min.js' | url }}"></script>
+      <script src="{{ 'assets/javascripts/bundle.0ddca959.min.js' | url }}"></script>
       {%- set translations = {} -%}
       {%- for key in [
         "clipboard.copy",

src/assets/javascripts/components/_/index.ts

@@ -39,6 +39,7 @@ import { getElement, replaceElement } from "browser"
  * Component
  */
 export type Component =
+  | "announce"                         /* Announcement bar */
   | "container"                        /* Container */
   | "header"                           /* Header */
   | "header-title"                     /* Header title */
@@ -114,6 +115,7 @@ export function setupComponents(
           switch (name) {
 
             /* Top-level components: update */
+            case "announce":
             case "header-title":
             case "container":
             case "skip":

src/assets/javascripts/components/header/_/index.ts

@@ -73,6 +73,7 @@ export interface Header {
  * Mount options
  */
 interface MountOptions {
+  document$: Observable<Document>      /* Document observable */
   viewport$: Observable<Viewport>      /* Viewport observable */
 }
 
@@ -88,11 +89,11 @@ interface MountOptions {
  * @return Operator function
  */
 export function mountHeader(
-  { viewport$ }: MountOptions
+  { document$, viewport$ }: MountOptions
 ): OperatorFunction<HTMLElement, Header> {
   return pipe(
     switchMap(el => {
-      const header$ = watchHeader(el)
+      const header$ = watchHeader(el, { document$ })
 
       /* Compute whether the header should switch to page header */
       const type$ = useComponent("main")

src/assets/javascripts/components/header/react/index.ts

@@ -28,10 +28,12 @@ import {
   pipe
 } from "rxjs"
 import {
+  distinctUntilChanged,
   finalize,
   map,
   observeOn,
   shareReplay,
+  switchMap,
   tap
 } from "rxjs/operators"
 
@@ -43,6 +45,17 @@ import {
   setHeaderTitleActive
 } from "../set"
 
+/* ----------------------------------------------------------------------------
+ * Helper types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Watch options
+ */
+interface WatchOptions {
+  document$: Observable<Document>      /* Document observable */
+}
+
 /* ----------------------------------------------------------------------------
  * Functions
  * ------------------------------------------------------------------------- */
@@ -55,27 +68,36 @@ import {
  * @return Header observable
  */
 export function watchHeader(
-  el: HTMLElement
+  el: HTMLElement, { document$ }: WatchOptions
 ): Observable<Omit<Header, "type">> {
-  const styles = getComputedStyle(el)
-  if ([
-    "sticky",                          /* Modern browsers */
-    "-webkit-sticky"                   /* Safari */
-  ].includes(styles.position)) {
-    return watchElementSize(el)
-      .pipe(
-        map(({ height }) => ({
-          sticky: true,
-          height
-        })),
-        shareReplay(1)
-      )
-  } else {
-    return of({
-      sticky: false,
-      height: 0
-    })
-  }
+  return document$
+    .pipe(
+      map(() => {
+        const styles = getComputedStyle(el)
+        return [
+          "sticky",                    /* Modern browsers */
+          "-webkit-sticky"             /* Safari */
+        ].includes(styles.position)
+      }),
+      distinctUntilChanged(),
+      switchMap(sticky => {
+        if (sticky) {
+          return watchElementSize(el)
+            .pipe(
+              map(({ height }) => ({
+                sticky: true,
+                height
+              }))
+            )
+        } else {
+          return of({
+            sticky: false,
+            height: 0
+          })
+        }
+      }),
+      shareReplay(1)
+    )
 }
 
 /* ------------------------------------------------------------------------- */

src/assets/javascripts/index.ts

@@ -158,6 +158,7 @@ export function initialize(config: unknown) {
 
   /* Set up component bindings */
   setupComponents([
+    "announce",                        /* Announcement bar */
     "container",                       /* Container */
     "header",                          /* Header */
     "header-title",                    /* Header title */
@@ -192,7 +193,7 @@ export function initialize(config: unknown) {
   /* Create header observable */
   const header$ = useComponent("header")
     .pipe(
-      mountHeader({ viewport$ }),
+      mountHeader({ document$, viewport$ }),
       shareReplay(1)
     )
 

src/assets/stylesheets/layout/_announce.scss

@@ -26,6 +26,7 @@
 
 // Announcement bar
 .md-announce {
+  overflow: auto;
   background-color: var(--md-default-fg-color);
 
   // Actual content

src/base.html

@@ -201,21 +201,25 @@
     <label class="md-overlay" for="__drawer"></label>
 
     <!-- Link to skip to content -->
-    {% if page.toc | first is defined %}
-      {% set skip = page.toc | first %}
-      <a href="{{ skip.url | url }}" class="md-skip" data-md-component="skip">
-        {{ lang.t('skip.link.title') }}
-      </a>
-    {% endif %}
+    <div data-md-component="skip">
+      {% if page.toc | first is defined %}
+        {% set skip = page.toc | first %}
+        <a href="{{ skip.url | url }}" class="md-skip">
+          {{ lang.t('skip.link.title') }}
+        </a>
+      {% endif %}
+    </div>
 
     <!-- Announcement bar -->
-    {% if self.announce() %}
-      <aside class="md-announce" data-md-component="announce">
-        <div class="md-announce__inner md-grid md-typeset">
-          {% block announce %}{% endblock %}
-        </div>
-      </aside>
-    {% endif %}
+    <div data-md-component="announce">
+      {% if self.announce() %}
+        <aside class="md-announce">
+          <div class="md-announce__inner md-grid md-typeset">
+            {% block announce %}{% endblock %}
+          </div>
+        </aside>
+      {% endif %}
+    </div>
 
     <!-- Application header -->
     {% block header %}