Add active link classes to site navigation menu (#463)

docs/guides-navigation.md

@@ -158,3 +158,15 @@ headerLinks: [
   { doc: 'bar', label: 'Bar' },
 ],
 ```
+
+## Active Links In Site Navigation Bar
+
+The links in the top navigation bar get `siteNavItemActive` and `siteNavGroupActive` class names to allow you to style the currently active link different from the others. `siteNavItemActive` is applied when there's an exact match between the navigation link and the currently displayed web page.
+
+> This does not include links of type `href` which are meant for external links only. If you manually set an `href` in your headerLinks to an internal page, document, or blog post, it will not get the `siteNavItemActive` class even if that page is being displayed.
+
+`siteNavGroupActive` will be added to these links:
+* `doc` links that belong to the same sidebar as the currently displayed document
+* The blog link when a blog post, or the blog listing page is being displayed
+
+These are two separate class names so you can have the active styles applied to either exact matches only or a bit more broadly for docs that belong together. If you don't want to make this distinction you can add both classes to the same css rule.

lib/core/BlogPageLayout.js

@@ -26,7 +26,11 @@ class BlogPageLayout extends React.Component {
     const perPage = this.props.metadata.perPage;
     const page = this.props.metadata.page;
     return (
-      <Site title="Blog" language="en" config={this.props.config}>
+      <Site
+        title="Blog"
+        language="en"
+        config={this.props.config}
+        metadata={{blog: true, blogListing: true}}>
         <div className="docMainWrapper wrapper">
           <BlogSidebar
             language={this.props.language}

lib/core/BlogPostLayout.js

@@ -79,7 +79,8 @@ class BlogPostLayout extends React.Component {
         title={this.props.metadata.title}
         language={'en'}
         description={this.getDescription()}
-        config={this.props.config}>
+        config={this.props.config}
+        metadata={{blog: true}}>
         <div className="docMainWrapper wrapper">
           <BlogSidebar
             language={'en'}

lib/core/DocsLayout.js

@@ -36,7 +36,8 @@ class DocsLayout extends React.Component {
         }
         description={content.trim().split('\n')[0]}
         language={metadata.language}
-        version={metadata.version}>
+        version={metadata.version}
+        metadata={metadata}>
         <div className="docMainWrapper wrapper">
           <DocsSidebar metadata={metadata} />
           <Container className="mainContainer">

lib/core/Site.js

@@ -75,6 +75,7 @@ class Site extends React.Component {
             title={this.props.config.title}
             language={this.props.language}
             version={this.props.version}
+            current={this.props.metadata}
           />
           <div className="navPusher">
             {this.props.children}

lib/core/nav/HeaderNav.js

@@ -9,6 +9,7 @@ const CWD = process.cwd();
 
 const React = require('react');
 const fs = require('fs');
+const classNames = require('classnames');
 const siteConfig = require(CWD + '/siteConfig.js');
 const translation = require('../../server/translation.js');
 const env = require('../../server/env.js');
@@ -97,6 +98,8 @@ class HeaderNav extends React.Component {
   // function to generate each header link, used with each object in siteConfig.headerLinks
   makeLinks(link) {
     let href;
+    let docItemActive = false;
+    let docGroupActive = false;
     if (link.search && this.props.config.algolia) {
       // return algolia search bar
       return (
@@ -153,6 +156,10 @@ class HeaderNav extends React.Component {
         throw new Error(errorStr);
       }
       href = this.props.config.baseUrl + Metadata[id].permalink;
+
+      const {id: currentID, sidebar} = this.props.current;
+      docItemActive = currentID && currentID === id;
+      docGroupActive = sidebar && sidebar === Metadata[id].sidebar;
     } else if (link.page) {
       // set link to page with current page's language if appropriate
       const language = this.props.language || '';
@@ -172,8 +179,16 @@ class HeaderNav extends React.Component {
       // set link to blog url
       href = this.props.baseUrl + 'blog';
     }
+    const itemClasses = classNames({
+      siteNavGroupActive:
+        (link.doc && docGroupActive) || (link.blog && this.props.current.blog),
+      siteNavItemActive:
+        docItemActive ||
+        (link.blog && this.props.current.blogListing) ||
+        (link.page && link.page === this.props.current.id),
+    });
     return (
-      <li key={link.label + 'page'}>
+      <li key={link.label + 'page'} className={itemClasses}>
         <a href={href} target={link.external ? '_blank' : '_self'}>
           {translation[this.props.language]
             ? translation[this.props.language]['localized-strings'][link.label]
@@ -279,4 +294,8 @@ class HeaderNav extends React.Component {
   }
 }
 
+HeaderNav.defaultProps = {
+  current: {},
+};
+
 module.exports = HeaderNav;

lib/server/generate.js

@@ -407,6 +407,8 @@ function execute() {
   files.forEach(file => {
     // render .js files to strings
     if (file.match(/\.js$/)) {
+      const pageID = path.basename(file, '.js');
+
       // make temp file for sake of require paths
       const parts = file.split('pages');
       let tempFile = join(__dirname, '..', 'pages', parts[1]);
@@ -439,7 +441,10 @@ function execute() {
           }
           translate.setLanguage(language);
           const str = renderToStaticMarkup(
-            <Site language={language} config={siteConfig}>
+            <Site
+              language={language}
+              config={siteConfig}
+              metadata={{id: pageID}}>
               <ReactComp language={language} />
             </Site>
           );
@@ -454,7 +459,7 @@ function execute() {
         let language = env.translation.enabled ? 'en' : '';
         translate.setLanguage(language);
         const str = renderToStaticMarkup(
-          <Site language={language} config={siteConfig}>
+          <Site language={language} config={siteConfig} metadata={{id: pageID}}>
             <ReactComp language={language} />
           </Site>
         );
@@ -464,7 +469,7 @@ function execute() {
         let language = env.translation.enabled ? 'en' : '';
         translate.setLanguage(language);
         const str = renderToStaticMarkup(
-          <Site language={language} config={siteConfig}>
+          <Site language={language} config={siteConfig} metadata={{id: pageID}}>
             <ReactComp language={language} />
           </Site>
         );
@@ -472,10 +477,11 @@ function execute() {
       }
       fs.removeSync(tempFile);
     } else if (siteConfig.wrapPagesHTML && file.match(/\.html$/)) {
+      const pageID = path.basename(file, '.html');
       const parts = file.split('pages');
       const targetFile = join(buildDir, parts[1]);
       const str = renderToStaticMarkup(
-        <Site language="en" config={siteConfig}>
+        <Site language="en" config={siteConfig} metadata={{id: pageID}}>
           <div
             dangerouslySetInnerHTML={{
               __html: fs.readFileSync(file, {encoding: 'utf8'}),

lib/server/server.js

@@ -366,7 +366,10 @@ function execute(port) {
         removeModuleAndChildrenFromCache('../core/Site.js');
         const Site = require('../core/Site.js');
         const str = renderToStaticMarkup(
-          <Site language="en" config={siteConfig}>
+          <Site
+            language="en"
+            config={siteConfig}
+            metadata={{id: path.basename(htmlFile, '.html')}}>
             <div
               dangerouslySetInnerHTML={{
                 __html: fs.readFileSync(htmlFile, {encoding: 'utf8'}),
@@ -434,7 +437,10 @@ function execute(port) {
       const Site = require('../core/Site.js');
       translate.setLanguage(language);
       const str = renderToStaticMarkup(
-        <Site language={language} config={siteConfig}>
+        <Site
+          language={language}
+          config={siteConfig}
+          metadata={{id: path.basename(userFile, '.js')}}>
           <ReactComp language={language} />
         </Site>
       );

lib/static/css/main.css

@@ -1009,7 +1009,9 @@ pre code {
   font-size: 0.9em;
 }
 .navigationSlider .slidingNav ul li a:focus,
-.navigationSlider .slidingNav ul li a:hover {
+.navigationSlider .slidingNav ul li a:hover,
+.navigationSlider .slidingNav ul li.siteNavItemActive a,
+  .navigationSlider .slidingNav ul li.siteNavGroupActive a {
   background: $primaryColor;
 }
 
@@ -1195,10 +1197,9 @@ ul#languages li {
     height: 32px;
     font-size: 1em;
   }
-  .navigationSlider .slidingNav ul li a:hover {
+  .navigationSlider .slidingNav ul li a:hover,
-    color: #fff;
+  .navigationSlider .slidingNav ul li.siteNavItemActive a,
-  }
+  .navigationSlider .slidingNav ul li.siteNavGroupActive a {
-  .navigationSlider .slidingNav ul li.navItemActive a {
     color: #fff;
   }
 }