Allow configuring the tab and page the Docs Embed opens on (RND-12456) (#4669)

.changeset/embed-default-tab-page.md

@@ -0,0 +1,6 @@
+---
+"@gitbook/embed": minor
+"gitbook": patch
+---
+
+Add `defaultTab` and `defaultPage` options to the Docs Embed to choose where it opens. `defaultTab` opens the embed on the assistant, search or docs tab. `defaultPage` sets the page the docs tab opens on in place of the site's home page, and the embed opens on that page unless `defaultTab` says otherwise. Both work with the standalone script's `configure`, `frame.configure` and `<GitBookFrame>` props.

packages/embed/README.md

@@ -54,6 +54,7 @@ GitBook('configure', {
         icon: 'assistant' // 'assistant' | 'sparkle' | 'help' | 'book'
     },
     tabs: ['assistant', 'search', 'docs'],
+    defaultPage: '/getting-started',
     actions: [
         {
             icon: 'circle-question',
@@ -107,6 +108,7 @@ frame.clearChat();
 // Configure the embed (see Configuration section for all options)
 frame.configure({
     tabs: ['assistant', 'search', 'docs'],
+    defaultPage: '/getting-started',
     actions: [
         {
             icon: 'circle-question',
@@ -142,6 +144,7 @@ import { GitBookProvider, GitBookFrame } from '@gitbook/embed/react';
             unsignedClaims: { userId: '123' } // Optional: custom claims for dynamic expressions
         }}
         tabs={['assistant', 'search', 'docs']}
+        defaultPage="/getting-started"
         greeting={{ title: 'Welcome!', subtitle: 'How can I help?' }}
         assistantName="Support Assistant"
         suggestions={['What is GitBook?', 'How do I get started?']}
@@ -249,6 +252,33 @@ Override which tabs are displayed. Defaults to your site's configuration.
 tabs: ['assistant', 'search', 'docs']
 ```
 
+### `defaultTab`
+
+Available in: Standalone script, NPM package, React components
+
+The tab the embed opens on. Without it, the embed opens on `defaultPage` if set, otherwise on the assistant (or the docs when the assistant isn't available). The tab must be one of the enabled `tabs`.
+
+- **Type**: `'assistant' | 'search' | 'docs'`
+
+```javascript
+tabs: ['assistant', 'search', 'docs'],
+defaultTab: 'search'
+```
+
+`defaultTab` and `defaultPage` apply when the embed first loads: the standalone widget keeps its place when it is closed and reopened. To move it later, use `navigateToPage` or `navigateToAssistant`.
+
+### `defaultPage`
+
+Available in: Standalone script, NPM package, React components
+
+The page the docs tab opens on, in place of your site's home page. Accepts the same references as `navigateToPage`: the page's path within the site, an absolute path, or its full published URL. Unless `defaultTab` says otherwise, the embed opens on this page.
+
+- **Type**: `string`
+
+```javascript
+defaultPage: '/getting-started/quickstart'
+```
+
 ### `closeButton`
 
 Available in: Standalone script, NPM package, React components

packages/embed/src/client/protocol.ts

@@ -62,6 +62,12 @@ export type GitBookEmbeddableConfiguration = {
     /** Tabs to display in the embed (if enabled on the site). */
     tabs: ('assistant' | 'docs' | 'search')[];
 
+    /** Tab to open the embed on. */
+    defaultTab?: 'assistant' | 'docs' | 'search';
+
+    /** Page to open the docs tab on, instead of the site's home page. */
+    defaultPage?: string;
+
     /** Additional buttons to be displayed in the header of the GitBook embed. */
     actions: GitBookEmbeddableActionDefinition[];
 

packages/embed/src/react/GitBookFrame.tsx

@@ -27,6 +27,8 @@ export function GitBookFrame(props: GitBookFrameProps) {
         suggestions = [],
         tools = [],
         tabs = ['assistant', 'search', 'docs'],
+        defaultTab,
+        defaultPage,
         trademark = true,
         closeButton = false,
         assistantName,
@@ -50,6 +52,8 @@ export function GitBookFrame(props: GitBookFrameProps) {
     useEffect(() => {
         gitbookFrame?.configure({
             tabs,
+            defaultTab,
+            defaultPage,
             actions,
             greeting,
             suggestions,
@@ -65,6 +69,8 @@ export function GitBookFrame(props: GitBookFrameProps) {
         suggestions,
         tools,
         tabs,
+        defaultTab,
+        defaultPage,
         closeButton,
         trademark,
         assistantName,

packages/gitbook/src/components/Embeddable/EmbeddableIframeAPI.tsx

@@ -9,6 +9,7 @@ import type { GitBookEmbeddableConfiguration, ParentToFrameMessage } from '@gitb
 import { integrationsAssistantTools } from '../Integrations';
 import { Button, LinkContext, type LinkContextType } from '../primitives';
 import { getChannel } from './channel';
+import { DEFAULT_EMBEDDABLE_TABS, getEmbeddableLandingTab } from './getEmbeddableLandingTab';
 import { resolveEmbedPageLink } from './server-actions';
 import { useAI, useAIChatController } from '@/components/AI';
 import { isAIChatEnabled } from '@/components/utils/isAIChatEnabled';
@@ -23,6 +24,17 @@ const embeddableConfiguration = createStore<GitBookEmbeddableConfiguration>(() =
     trademark: true,
 }));
 
+const docsHome = createStore<{ reference?: string; href?: string }>(() => ({}));
+
+// Module-level so it survives the layout remounting on a cross-space navigation.
+let landed = false;
+
+function resolvePageHref(pagePath: string, baseURL: string): Promise<string> {
+    return resolveEmbedPageLink(pagePath)
+        .then((resolved) => ('href' in resolved ? resolved.href : `${baseURL}/page/${pagePath}`))
+        .catch(() => `${baseURL}/page/${pagePath}`);
+}
+
 // oxlint-disable-next-line typescript/no-explicit-any
 function log(...data: any[]) {
     // oxlint-disable-next-line no-console
@@ -66,6 +78,15 @@ export function EmbeddableIframeAPI(props: { baseURL: string }) {
             const { baseURL, router, chatController } = refs.current;
             const message = payload as ParentToFrameMessage;
 
+            const navigate = (href: Promise<string>) => {
+                const token = ++navToken.current;
+                href.then((href) => {
+                    if (navToken.current === token) {
+                        refs.current.router.push(href);
+                    }
+                });
+            };
+
             log('[gitbook] received message', message);
 
             switch (message.type) {
@@ -83,29 +104,43 @@ export function EmbeddableIframeAPI(props: { baseURL: string }) {
                     break;
                 }
                 case 'configure': {
-                    embeddableConfiguration.setState(message.settings);
+                    const { settings } = message;
+                    embeddableConfiguration.setState(settings);
                     integrationsAssistantTools.setState({
-                        tools: message.settings.tools,
+                        tools: settings.tools,
                     });
+
+                    const defaultPage =
+                        typeof settings.defaultPage === 'string' && settings.defaultPage
+                            ? settings.defaultPage
+                            : undefined;
+                    let docsHomeHref: Promise<string> | undefined;
+                    if (defaultPage !== docsHome.getState().reference) {
+                        docsHome.setState({ reference: defaultPage, href: undefined });
+                        if (defaultPage) {
+                            docsHomeHref = resolvePageHref(defaultPage, baseURL);
+                            docsHomeHref.then((href) => {
+                                if (docsHome.getState().reference === defaultPage) {
+                                    docsHome.setState({ href });
+                                }
+                            });
+                        }
+                    }
+
+                    if (!landed) {
+                        landed = true;
+                        const tab = getEmbeddableLandingTab(settings);
+                        if (tab === 'docs') {
+                            navigate(docsHomeHref ?? Promise.resolve(`${baseURL}/page/`));
+                        } else if (tab) {
+                            navToken.current++;
+                            router.push(`${baseURL}/${tab}`);
+                        }
+                    }
                     break;
                 }
                 case 'navigateToPage': {
-                    // Resolve the target server-side: on a multi-space site the page may
+                    navigate(resolvePageHref(message.pagePath, baseURL));
-                    // live in another space/section, whose base must go before
-                    // `~gitbook/embed/page`. Fall back to a same-space push on failure.
-                    const { pagePath } = message;
-                    const token = ++navToken.current;
-                    // Ignore the result if a later navigation has since superseded this one.
-                    const push = (href: string) => {
-                        if (navToken.current === token) {
-                            router.push(href);
-                        }
-                    };
-                    resolveEmbedPageLink(pagePath)
-                        .then((resolved) =>
-                            push('href' in resolved ? resolved.href : `${baseURL}/page/${pagePath}`)
-                        )
-                        .catch(() => push(`${baseURL}/page/${pagePath}`));
                     break;
                 }
                 case 'navigateToAssistant': {
@@ -132,7 +167,7 @@ export function useEmbeddableConfiguration<T = GitBookEmbeddableConfiguration>(
 
 export function useEmbeddableTabs() {
     const configuredTabs = useEmbeddableConfiguration((state) => state.tabs);
-    return configuredTabs.length > 0 ? configuredTabs : ['assistant', 'search', 'docs'];
+    return configuredTabs.length > 0 ? configuredTabs : DEFAULT_EMBEDDABLE_TABS;
 }
 
 export function useEmbeddableLinkContext() {
@@ -200,6 +235,7 @@ export function EmbeddableIframeTabs(props: {
     const { ref, active = 'assistant', baseURL, siteTitle, onNavigate } = props;
     const actions = useEmbeddableConfiguration((state) => state.actions);
     const tabs = useEmbeddableTabs();
+    const docsHomeHref = useStore(docsHome, (state) => state.href);
 
     const { assistants, config } = useAI();
     const language = useLanguage();
@@ -228,7 +264,7 @@ export function EmbeddableIframeTabs(props: {
                   key: 'docs',
                   label: siteTitle,
                   icon: 'book-open',
-                  href: `${baseURL}/page/`,
+                  href: docsHomeHref ?? `${baseURL}/page/`,
               }
             : null,
     ].filter((tab) => tab !== null);

packages/gitbook/src/components/Embeddable/getEmbeddableLandingTab.test.ts

@@ -0,0 +1,39 @@
+import { describe, expect, it } from 'bun:test';
+
+import { getEmbeddableLandingTab } from './getEmbeddableLandingTab';
+
+describe('getEmbeddableLandingTab', () => {
+    it('keeps the embed default when nothing is configured', () => {
+        expect(getEmbeddableLandingTab({})).toBeNull();
+        expect(getEmbeddableLandingTab({ tabs: ['docs', 'search'] })).toBeNull();
+    });
+
+    it('opens on the configured tab', () => {
+        expect(getEmbeddableLandingTab({ defaultTab: 'search' })).toBe('search');
+        expect(
+            getEmbeddableLandingTab({ tabs: ['assistant', 'search', 'docs'], defaultTab: 'search' })
+        ).toBe('search');
+    });
+
+    it('opens on the docs when only a default page is set', () => {
+        expect(getEmbeddableLandingTab({ defaultPage: 'getting-started' })).toBe('docs');
+    });
+
+    it('prefers the configured tab over the default page', () => {
+        expect(
+            getEmbeddableLandingTab({ defaultTab: 'assistant', defaultPage: 'getting-started' })
+        ).toBe('assistant');
+    });
+
+    it('ignores a tab that is not enabled', () => {
+        expect(getEmbeddableLandingTab({ tabs: ['assistant'], defaultTab: 'search' })).toBeNull();
+        expect(
+            getEmbeddableLandingTab({ tabs: ['assistant', 'search'], defaultPage: 'quickstart' })
+        ).toBeNull();
+    });
+
+    it('ignores an unknown tab', () => {
+        // @ts-expect-error - the parent window is plain JS and can send anything.
+        expect(getEmbeddableLandingTab({ defaultTab: 'settings' })).toBeNull();
+    });
+});

packages/gitbook/src/components/Embeddable/getEmbeddableLandingTab.ts

@@ -0,0 +1,17 @@
+import type { GitBookEmbeddableConfiguration } from '@gitbook/embed';
+
+export type EmbeddableTab = GitBookEmbeddableConfiguration['tabs'][number];
+
+export const DEFAULT_EMBEDDABLE_TABS: EmbeddableTab[] = ['assistant', 'search', 'docs'];
+
+export function getEmbeddableLandingTab(
+    settings: Partial<Pick<GitBookEmbeddableConfiguration, 'tabs' | 'defaultTab' | 'defaultPage'>>
+): EmbeddableTab | null {
+    const tab = settings.defaultTab ?? (settings.defaultPage ? 'docs' : undefined);
+    if (!tab || !DEFAULT_EMBEDDABLE_TABS.includes(tab)) {
+        return null;
+    }
+
+    const tabs = settings.tabs?.length ? settings.tabs : DEFAULT_EMBEDDABLE_TABS;
+    return tabs.includes(tab) ? tab : null;
+}