fix(aio): fix window title on Home page (#20440)

Using `display: none` on the `<h1>` causes `innerText` to not work as expected
and include the icon ligature (`link`) in the title. This caused the window
title on the angular.io Home page to appear as "Angular - link".
This commit fixes it by not generating anchors at all for headings with the
`no-anchor` class.

Fixes #20427

PR Close #20440

aio/content/marketing/index.html

@@ -25,7 +25,7 @@
 <!-- MAIN CONTENT -->
 <article>
 
-  <h1 class="no-toc" style="display: none"></h1>
+  <h1 class="no-anchor no-toc" style="display: none"></h1>
 
   <div class="home-rows">
 

aio/e2e/app.e2e-spec.ts

@@ -15,6 +15,16 @@ describe('site App', function() {
     expect(page.getDocViewerText()).toMatch(/Progressive web apps/i);
   });
 
+  it('should set appropriate window titles', () => {
+    expect(browser.getTitle()).toBe('Angular');
+
+    page.getTopMenuLink('features').click();
+    expect(browser.getTitle()).toBe('Angular - FEATURES & BENEFITS');
+
+    page.homeLink.click();
+    expect(browser.getTitle()).toBe('Angular');
+  });
+
   it('should show the tutorial index page at `/tutorial/` after jitterbugging through features', () => {
     // check that we can navigate directly to the tutorial page
     page.navigateTo('tutorial/');

aio/e2e/app.po.ts

@@ -5,6 +5,7 @@ const githubRegex = /https:\/\/github.com\/angular\/angular\//;
 export class SitePage {
 
   links = element.all(by.css('md-toolbar a'));
+  homeLink = element(by.css('a.home'));
   docsMenuLink = element(by.cssContainingText('aio-top-menu a', 'Docs'));
   docViewer = element(by.css('aio-doc-viewer'));
   codeExample = element.all(by.css('aio-doc-viewer pre > code'));

aio/package.json

@@ -126,7 +126,6 @@
     "lunr": "^2.1.0",
     "protractor": "^5.2.0",
     "rehype": "^4.0.0",
-    "rehype-autolink-headings": "^2.0.0",
     "rehype-slug": "^2.0.0",
     "remark": "^7.0.0",
     "remark-html": "^6.0.0",

aio/src/app/layout/doc-viewer/doc-viewer.component.spec.ts

@@ -361,6 +361,22 @@ describe('DocViewerComponent', () => {
       fixture.detectChanges();
       expect(titleService.setTitle).toHaveBeenCalledWith('Angular - Text Content');
     });
+
+    it('should still use `innerText` if available but empty', () => {
+      const querySelector_ = docViewerEl.querySelector;
+      spyOn(docViewerEl, 'querySelector').and.callFake((selector: string) => {
+        const elem = querySelector_.call(docViewerEl, selector);
+        Object.defineProperties(elem, {
+          innerText: { value: '' },
+          textContent: { value: 'Text Content' }
+        });
+        return elem;
+      });
+
+      setCurrentDoc('<h1><i style="visibility: hidden">link</i></h1>Some content');
+      fixture.detectChanges();
+      expect(titleService.setTitle).toHaveBeenCalledWith('Angular');
+    });
   });
 
   describe('TOC', () => {

aio/src/app/layout/doc-viewer/doc-viewer.component.ts

@@ -92,17 +92,19 @@ export class DocViewerComponent implements DoCheck, OnDestroy {
 
   private addTitleAndToc(docId: string) {
     this.tocService.reset();
-    let title = '';
     const titleEl = this.hostElement.querySelector('h1');
+    let title = '';
+
     // Only create TOC for docs with an <h1> title
     // If you don't want a TOC, add "no-toc" class to <h1>
     if (titleEl) {
-      title = (titleEl.innerText || titleEl.textContent).trim();
+      title = (typeof titleEl.innerText === 'string') ? titleEl.innerText : titleEl.textContent;
       if (!/(no-toc|notoc)/i.test(titleEl.className)) {
         this.tocService.genToc(this.hostElement, docId);
         titleEl.insertAdjacentHTML('afterend', '<aio-toc class="embedded"></aio-toc>');
       }
     }
+
     this.titleService.setTitle(title ? `Angular - ${title}` : 'Angular');
   }
 

aio/tools/transforms/angular-base-package/post-processors/autolink-headings.js

@@ -1,9 +1,34 @@
+const has = require('hast-util-has-property');
+const is = require('hast-util-is-element');
 const slug = require('rehype-slug');
-const link = require('rehype-autolink-headings');
+const visit = require('unist-util-visit');
 
 /**
- * Get remark to inject anchors into headings
+ * Get remark to add IDs to headings and inject anchors into them.
+ * This is a stripped-down equivalent of [rehype-autolink-headings](https://github.com/wooorm/rehype-autolink-headings)
+ * that supports ignoring headings with the `no-anchor` class.
  */
+const HEADINGS = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'];
+const NO_ANCHOR_CLASS = 'no-anchor';
+
+const clone = obj => JSON.parse(JSON.stringify(obj));
+const hasClass = (node, cls) => {
+  const className = node.properties.className;
+  return className && className.includes(cls);
+};
+
+const link = options =>
+  tree => visit(tree, node => {
+    if (is(node, HEADINGS) && has(node, 'id') && !hasClass(node, NO_ANCHOR_CLASS)) {
+      node.children.unshift({
+        type: 'element',
+        tagName: 'a',
+        properties: Object.assign(clone(options.properties), {href: `#${node.properties.id}`}),
+        children: clone(options.content)
+      });
+    }
+  });
+
 module.exports = [
   slug,
   [link, {
@@ -12,11 +37,13 @@ module.exports = [
       className: ['header-link'],
       'aria-hidden': 'true'
     },
-    content: {
-      type: 'element',
-      tagName: 'i',
-      properties: {className: ['material-icons']},
-      children: [{ type: 'text', value: 'link' }]
-    }
+    content: [
+      {
+        type: 'element',
+        tagName: 'i',
+        properties: {className: ['material-icons']},
+        children: [{ type: 'text', value: 'link' }]
+      }
+    ]
   }]
 ];

aio/tools/transforms/angular-base-package/post-processors/autolink-headings.spec.js

@@ -14,20 +14,37 @@ describe('autolink-headings postprocessor', () => {
   });
 
   it('should add anchors to headings', () => {
-    const docs = [ {
-      docType: 'a',
-      renderedContent: `
-        <h1>Heading 1</h2>
-        <h2>Heading with <strong>bold</strong></h2>
-        <h3>Heading with encoded chars &#x26;</h3>
-    `
-    }];
+    const originalContent = `
+      <h1>Heading 1</h2>
+      <h2>Heading with <strong>bold</strong></h2>
+      <h3>Heading with encoded chars &#x26;</h3>
+    `;
+    const processedContent = `
+      <h1 id="heading-1"><a title="Link to this heading" class="header-link" aria-hidden="true" href="#heading-1"><i class="material-icons">link</i></a>Heading 1</h1>
+      <h2 id="heading-with-bold"><a title="Link to this heading" class="header-link" aria-hidden="true" href="#heading-with-bold"><i class="material-icons">link</i></a>Heading with <strong>bold</strong></h2>
+      <h3 id="heading-with-encoded-chars-"><a title="Link to this heading" class="header-link" aria-hidden="true" href="#heading-with-encoded-chars-"><i class="material-icons">link</i></a>Heading with encoded chars &#x26;</h3>
+    `;
+
+    const docs = [{docType: 'a', renderedContent: originalContent}];
     processor.$process(docs);
-    expect(docs[0].renderedContent).toEqual(`
-        <h1 id="heading-1"><a title="Link to this heading" class="header-link" aria-hidden="true" href="#heading-1"><i class="material-icons">link</i></a>Heading 1</h1>
-        <h2 id="heading-with-bold"><a title="Link to this heading" class="header-link" aria-hidden="true" href="#heading-with-bold"><i class="material-icons">link</i></a>Heading with <strong>bold</strong></h2>
-        <h3 id="heading-with-encoded-chars-"><a title="Link to this heading" class="header-link" aria-hidden="true" href="#heading-with-encoded-chars-"><i class="material-icons">link</i></a>Heading with encoded chars &#x26;</h3>
-    `);
+    expect(docs[0].renderedContent).toBe(processedContent);
+  });
+
+  it('should ignore headings with the `no-anchor` class', () => {
+    const originalContent = `
+      <h1 class="no-anchor">Heading 1</h2>
+      <h2 class="no-anchor">Heading with <strong>bold</strong></h2>
+      <h3 class="no-anchor">Heading with encoded chars &#x26;</h3>
+    `;
+    const processedContent = `
+      <h1 class="no-anchor" id="heading-1">Heading 1</h1>
+      <h2 class="no-anchor" id="heading-with-bold">Heading with <strong>bold</strong></h2>
+      <h3 class="no-anchor" id="heading-with-encoded-chars-">Heading with encoded chars &#x26;</h3>
+    `;
+
+    const docs = [{docType: 'a', renderedContent: originalContent}];
+    processor.$process(docs);
+    expect(docs[0].renderedContent).toBe(processedContent);
   });
 });
 

aio/yarn.lock

@@ -2977,7 +2977,7 @@ express@^4.13.3:
     utils-merge "1.0.1"
     vary "~1.1.2"
 
-extend@3, extend@^3.0.0, extend@^3.0.1, extend@~3.0.0, extend@~3.0.1:
+extend@3, extend@^3.0.0, extend@~3.0.0, extend@~3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.1.tgz#a755ea7bc1adfcc5a31ce7e762dbaadc5e636444"
 
@@ -6999,15 +6999,6 @@ regjsparser@^0.1.4:
   dependencies:
     jsesc "~0.5.0"
 
-rehype-autolink-headings@^2.0.0:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/rehype-autolink-headings/-/rehype-autolink-headings-2.0.2.tgz#48c7161b1a1020e942c758eb6b2c55cb1bc504d0"
-  dependencies:
-    extend "^3.0.1"
-    hast-util-has-property "^1.0.0"
-    hast-util-is-element "^1.0.0"
-    unist-util-visit "^1.1.0"
-
 rehype-parse@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/rehype-parse/-/rehype-parse-3.1.0.tgz#7f5227a597a3f39fc4b938646161539c444ee728"