Added support for instant navigation progress indicator

material/overrides/main.html

@@ -23,5 +23,5 @@
 {% endblock %}
 {% block scripts %}
   {{ super() }}
-  <script src="{{ 'assets/javascripts/custom.a4bbca43.min.js' | url }}"></script>
+  <script src="{{ 'assets/javascripts/custom.9458f965.min.js' | url }}"></script>
 {% endblock %}

material/templates/base.html

@@ -44,7 +44,7 @@
       {% endif %}
     {% endblock %}
     {% block styles %}
-      <link rel="stylesheet" href="{{ 'assets/stylesheets/main.1dbc8ddf.min.css' | url }}">
+      <link rel="stylesheet" href="{{ 'assets/stylesheets/main.79e020e9.min.css' | url }}">
       {% if config.theme.palette %}
         {% set palette = config.theme.palette %}
         <link rel="stylesheet" href="{{ 'assets/stylesheets/palette.a5377069.min.css' | url }}">
@@ -206,6 +206,9 @@
     <div class="md-dialog" data-md-component="dialog">
       <div class="md-dialog__inner md-typeset"></div>
     </div>
+    {% if "navigation.instant.progress" in features %}
+      {% include "partials/progress.html" %}
+    {% endif %}
     {% if config.extra.consent %}
       <div class="md-consent" data-md-component="consent" id="__consent" hidden>
         <div class="md-consent__overlay"></div>
@@ -250,7 +253,7 @@
       </script>
     {% endblock %}
     {% block scripts %}
-      <script src="{{ 'assets/javascripts/bundle.697ed5af.min.js' | url }}"></script>
+      <script src="{{ 'assets/javascripts/bundle.6eac0284.min.js' | url }}"></script>
       {% for script in config.extra_javascript %}
         {{ script | script_tag }}
       {% endfor %}

material/templates/partials/progress.html

@@ -0,0 +1,4 @@
+{#-
+  This file was automatically generated - do not edit
+-#}
+<div class="md-progress" data-md-component="progress" role="progressbar"></div>

mkdocs.yml

@@ -51,6 +51,8 @@ theme:
     - navigation.footer
     - navigation.indexes
     # - navigation.instant
+    # - navigation.instant.prefetch
+    # - navigation.instant.progress
     # - navigation.prune
     - navigation.sections
     - navigation.tabs
@@ -253,7 +255,7 @@ nav:
   - Insiders:
     - insiders/index.md
     - Getting started: insiders/getting-started.md
-    - Changelog: 
+    - Changelog:
       - insiders/changelog/index.md
       - How to upgrade: insiders/upgrade.md
   - Blog:

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

@@ -39,6 +39,7 @@ export type Flag =
   | "navigation.expand"                /* Automatic expansion */
   | "navigation.indexes"               /* Section pages */
   | "navigation.instant"               /* Instant navigation */
+  | "navigation.instant.progress"      /* Instant navigation progress */
   | "navigation.sections"              /* Section navigation */
   | "navigation.tabs"                  /* Tabs navigation */
   | "navigation.tabs.sticky"           /* Tabs navigation (sticky) */

src/templates/assets/javascripts/browser/request/index.ts

@@ -21,17 +21,24 @@
  */
 
 import {
-  EMPTY,
   Observable,
-  catchError,
-  from,
+  Subject,
   map,
-  of,
   shareReplay,
-  switchMap,
-  throwError
+  switchMap
 } from "rxjs"
 
+/* ----------------------------------------------------------------------------
+ * Helper types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Options
+ */
+interface Options {
+  progress$?: Subject<number>          // Progress subject
+}
+
 /* ----------------------------------------------------------------------------
  * Functions
  * ------------------------------------------------------------------------- */
@@ -48,16 +55,46 @@ import {
  * @returns Response observable
  */
 export function request(
-  url: URL | string, options: RequestInit = { credentials: "same-origin" }
-): Observable<Response> {
-  return from(fetch(`${url}`, options))
-    .pipe(
-      catchError(() => EMPTY),
-      switchMap(res => res.status !== 200
-        ? throwError(() => new Error(res.statusText))
-        : of(res)
-      )
-    )
+  url: URL | string, options?: Options
+): Observable<Blob> {
+  return new Observable<Blob>(observer => {
+    const req = new XMLHttpRequest()
+    req.open("GET",  `${url}`)
+    req.responseType = "blob"
+
+    // Handle response
+    req.addEventListener("load", () => {
+      if (req.status >= 200 && req.status < 300) {
+        observer.next(req.response)
+        observer.complete()
+      } else {
+        observer.error(new Error(req.statusText))
+      }
+    })
+
+    // Handle network errors
+    req.addEventListener("error", () => {
+      observer.error(new Error("Network Error"))
+    })
+
+    // Handle aborted requests
+    req.addEventListener("abort", () => {
+      observer.error(new Error("Request aborted"))
+    })
+
+    // Handle download progress
+    if (typeof options?.progress$ !== "undefined") {
+      req.addEventListener("progress", event => {
+        options.progress$!.next((event.loaded / event.total) * 100)
+      })
+
+      // Immediately set progress to 5% to indicate that we're loading
+      options.progress$.next(5)
+    }
+
+    // Send request
+    req.send()
+  })
 }
 
 /* ------------------------------------------------------------------------- */
@@ -73,11 +110,12 @@ export function request(
  * @returns Data observable
  */
 export function requestJSON<T>(
-  url: URL | string, options?: RequestInit
+  url: URL | string, options?: Options
 ): Observable<T> {
   return request(url, options)
     .pipe(
-      switchMap(res => res.json()),
+      switchMap(res => res.text()),
+      map(body => JSON.parse(body) as T),
       shareReplay(1)
     )
 }
@@ -91,7 +129,7 @@ export function requestJSON<T>(
  * @returns Data observable
  */
 export function requestXML(
-  url: URL | string, options?: RequestInit
+  url: URL | string, options?: Options
 ): Observable<Document> {
   const dom = new DOMParser()
   return request(url, options)

src/templates/assets/javascripts/bundle.ts

@@ -65,6 +65,7 @@ import {
   mountHeader,
   mountHeaderTitle,
   mountPalette,
+  mountProgress,
   mountSearch,
   mountSearchHiglight,
   mountSidebar,
@@ -143,9 +144,12 @@ const index$ = document.forms.namedItem("search")
 const alert$ = new Subject<string>()
 setupClipboardJS({ alert$ })
 
+/* Set up progress indicator */
+const progress$ = new Subject<number>()
+
 /* Set up instant navigation, if enabled */
 if (feature("navigation.instant"))
-  setupInstantNavigation({ location$, viewport$ })
+  setupInstantNavigation({ location$, viewport$, progress$ })
     .subscribe(document$)
 
 /* Set up version selector */
@@ -227,6 +231,10 @@ const control$ = merge(
   ...getComponentElements("palette")
     .map(el => mountPalette(el)),
 
+  /* Progress bar */
+  ...getComponentElements("progress")
+    .map(el => mountProgress(el, { progress$ })),
+
   /* Search */
   ...getComponentElements("search")
     .map(el => mountSearch(el, { index$, keyboard$ })),
@@ -304,4 +312,5 @@ window.tablet$    = tablet$            /* Media tablet observable */
 window.screen$    = screen$            /* Media screen observable */
 window.print$     = print$             /* Media print observable */
 window.alert$     = alert$             /* Alert subject */
+window.progress$  = progress$          /* Progress indicator subject */
 window.component$ = component$         /* Component observable */

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

@@ -41,6 +41,7 @@ export type ComponentType =
   | "main"                             /* Main area */
   | "outdated"                         /* Version warning */
   | "palette"                          /* Color palette */
+  | "progress"                         /* Progress indicator */
   | "search"                           /* Search */
   | "search-query"                     /* Search input */
   | "search-result"                    /* Search results */
@@ -86,6 +87,7 @@ interface ComponentTypeMap {
   "main": HTMLElement                  /* Main area */
   "outdated": HTMLElement              /* Version warning */
   "palette": HTMLElement               /* Color palette */
+  "progress": HTMLElement              /* Progress indicator */
   "search": HTMLElement                /* Search */
   "search-query": HTMLInputElement     /* Search input */
   "search-result": HTMLElement         /* Search results */

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

@@ -28,6 +28,7 @@ export * from "./dialog"
 export * from "./header"
 export * from "./main"
 export * from "./palette"
+export * from "./progress"
 export * from "./search"
 export * from "./sidebar"
 export * from "./source"

src/templates/assets/javascripts/components/progress/index.ts

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2016-2023 Martin Donath <[email protected]>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import {
+  Observable,
+  Subject,
+  defer,
+  finalize,
+  map,
+  tap
+} from "rxjs"
+
+import { Component } from "../_"
+
+/* ----------------------------------------------------------------------------
+ * Types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Progress indicator
+ */
+export interface Progress {
+  value: number                        // Progress value
+}
+
+/* ----------------------------------------------------------------------------
+ * Helper types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Mount options
+ */
+interface MountOptions {
+  progress$: Subject<number>           // Progress subject
+}
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Mount progress indicator
+ *
+ * @param el - Progress indicator element
+ * @param options - Options
+ *
+ * @returns Progress indicator component observable
+ */
+export function mountProgress(
+  el: HTMLElement, { progress$ }: MountOptions
+): Observable<Component<Progress>> {
+
+  // Mount component on subscription
+  return defer(() => {
+    const push$ = new Subject<Progress>()
+    push$.subscribe(({ value }) => {
+      el.style.setProperty("--md-progress-value", `${value}`)
+    })
+
+    // Create and return component
+    return progress$
+      .pipe(
+        tap(value => push$.next({ value })),
+        finalize(() => push$.complete()),
+        map(value => ({ ref: el, value }))
+      )
+  })
+}

src/templates/assets/javascripts/integrations/instant/index.ts

@@ -67,8 +67,9 @@ import { fetchSitemap } from "../sitemap"
  * Setup options
  */
 interface SetupOptions {
-  location$: Subject<URL>              /* Location subject */
-  viewport$: Observable<Viewport>      /* Viewport observable */
+  location$: Subject<URL>              // Location subject
+  viewport$: Observable<Viewport>      // Viewport observable
+  progress$: Subject<number>           // Progress suject
 }
 
 /* ----------------------------------------------------------------------------
@@ -138,7 +139,7 @@ function lookup(head: HTMLHeadElement): Map<string, HTMLElement> {
  * @returns Document observable
  */
 export function setupInstantNavigation(
-  { location$, viewport$ }: SetupOptions
+  { location$, viewport$, progress$ }: SetupOptions
 ): Observable<Document> {
   const config = configuration()
   if (location.protocol === "file:")
@@ -260,7 +261,7 @@ export function setupInstantNavigation(
       startWith(getLocation()),
       distinctUntilKeyChanged("pathname"),
       skip(1),
-      switchMap(url => request(url)
+      switchMap(url => request(url, { progress$ })
         .pipe(
           catchError(() => {
             setLocation(url, true)

src/templates/assets/stylesheets/main.scss

@@ -56,6 +56,7 @@
 @import "main/components/nav";
 @import "main/components/pagination";
 @import "main/components/post";
+@import "main/components/progress";
 @import "main/components/search";
 @import "main/components/select";
 @import "main/components/sidebar";