Fix TOC navigation

CHANGES.rst

@@ -5,6 +5,7 @@ CHANGES
 
 Unreleased
 ----------
+- Bugfix for TOC expand/collapse not working well across projects.
 
 2026/01/08 0.46.0
 -----------------
@@ -15,6 +16,9 @@ Unreleased
   navigation enhancements. Originally introduced in 0.43.0, reverted in 0.44.0.
 - CrateDB Npgsql docs were removed.
 
+This release was yanked, because the navigation didn't work across projects and
+couldn't be tested locally.
+
 2025/12/19 0.45.0
 -----------------
 - Reverted silencing build warnings, because it made the navigation bar look odd.

docs/tests/index.rst

@@ -4,12 +4,31 @@
 Navigation bar test pages
 #########################
 
-1. Clicking the title should expand the section and navigate to the section page
-2. Clicking just the icon should expand but not navigate to the section
-3. Clicking just the icon for an expanded section should collapse that section and leave other expanded sections expanded
-4. Hovering the mouse over an icon should show a fade background behind the icon
-5. Hovering the mouse over the title should show a fade background behind the title and the icon
-6. The current page should be highlighted in the navigation bar as the user navigates through the pages below.
+**Same-project entries (entries with actual TOC content):**
+
+1. Clicking the title expands the section, collapses sibling sections at the
+   same level, and navigates to the section page
+2. Clicking just the icon expands/collapses that section without navigating
+3. Clicking the icon for an expanded section collapses it, leaving other
+   expanded sections unchanged
+
+**Cross-project entries (entries linking to other projects):**
+
+4. Clicking the title navigates to that project
+5. Clicking just the icon also navigates to that project (since the TOC
+   content from another project isn't available to expand)
+
+**Visual feedback:**
+
+6. Hovering the mouse over an icon shows a fade background behind the icon
+7. Hovering the mouse over the title shows a fade background behind the title
+   and the icon
+8. The current page is highlighted in the navigation bar
+
+**Auto-expansion:**
+
+9. The Database Drivers section auto-expands when viewing a driver project
+   (only on first visit; user preference is respected thereafter)
 
 
 **Pages:**

src/crate/theme/rtd/crate/static/js/custom.js

@@ -79,25 +79,85 @@ document.addEventListener('DOMContentLoaded', () => {
     // Restore state on page load
     restoreNavState();
 
+    // Auto-expand sections marked with data-auto-expand="true"
+    // Used for Database Drivers when viewing a driver project.
+    // Only auto-expand if user hasn't explicitly set a preference for this checkbox.
+    const savedStates = localStorage.getItem('navState');
+    let userPreferences = {};
+    if (savedStates) {
+        try {
+            userPreferences = JSON.parse(savedStates);
+        } catch (e) {
+            // Ignore parse errors, treat as no preferences
+        }
+    }
+    let autoExpandStateChanged = false;
+
+    document.querySelectorAll('[data-auto-expand="true"]').forEach((li) => {
+        const checkbox = li.querySelector('.toctree-checkbox');
+        if (checkbox && checkbox.id) {
+            // Only auto-expand if user has no saved preference for this checkbox
+            if (!(checkbox.id in userPreferences)) {
+                checkbox.checked = true;
+                autoExpandStateChanged = true;
+            }
+        }
+    });
+
+    // Save the auto-expanded state so it persists
+    if (autoExpandStateChanged) {
+        saveNavState();
+    }
+
     // Save state when checkboxes change
     document.querySelectorAll('.toctree-checkbox').forEach((checkbox) => {
         checkbox.addEventListener('change', saveNavState);
     });
 
-    // Make clicking the link text expand the section if collapsed, then navigate
-    // Design: Click expands collapsed sections AND navigates to the page.
-    // Already-expanded sections just navigate (no toggle). This allows users to
-    // expand nested navigation while browsing, without collapsing sections they
-    // want to keep visible.
+    // Make clicking the link text expand the section and collapse siblings.
+    // This provides consistent UX: clicking any title shows only that section's
+    // children, matching what happens with cross-project navigation.
     document.querySelectorAll('.bs-docs-sidenav li.has-children > a, .bs-docs-sidenav li.has-children > .reference').forEach((link) => {
         link.addEventListener('click', () => {
             const li = link.parentElement;
             const checkbox = li.querySelector('.toctree-checkbox');
-            if (checkbox && !checkbox.checked) {
-                // Only expand if collapsed - navigation proceeds regardless
+
+            // Collapse sibling sections at the same level
+            const parent = li.parentElement;
+            if (parent) {
+                parent.querySelectorAll(':scope > li.has-children > .toctree-checkbox').forEach((siblingCheckbox) => {
+                    if (siblingCheckbox !== checkbox && siblingCheckbox.checked) {
+                        siblingCheckbox.checked = false;
+                    }
+                });
+            }
+
+            // Expand this section
+            if (checkbox) {
                 checkbox.checked = true;
-                saveNavState();
             }
+
+            saveNavState();
+        });
+    });
+
+    // Cross-project navigation: clicking expand icon on entries with empty <ul>
+    // should navigate to that project instead of just toggling the checkbox.
+    // It's ok UX, but also just plain needed as we can't expand the TOC of another project :-(
+    document.querySelectorAll('.bs-docs-sidenav li.has-children > label').forEach((label) => {
+        label.addEventListener('click', (e) => {
+            const li = label.parentElement;
+            const ul = li.querySelector(':scope > ul');
+            // Check if <ul> is empty (cross-project entry)
+            if (ul && ul.children.length === 0) {
+                const link = li.querySelector(':scope > a');
+                if (link && link.href) {
+                    e.preventDefault();
+                    e.stopPropagation();
+                    window.location.href = link.href;
+                }
+            }
+            // If <ul> has children, default behavior (toggle checkbox) applies
         });
     });
 });

src/crate/theme/rtd/sidebartoc.py

@@ -20,6 +20,62 @@
 # software solely pursuant to the terms of the relevant commercial agreement.
 
 from furo.navigation import get_navigation_tree
+from datetime import datetime
+import os
+import re
+
+
+def _slugify_id(text):
+    """Normalize text to a safe HTML ID: alphanumerics and hyphens only."""
+    s = re.sub(r'[^a-z0-9-]', '-', text.lower())
+    s = re.sub(r'-{2,}', '-', s)  # collapse multiple hyphens
+    return s.strip('-')
+
+
+class _NavBuilder:
+    """Helper to build navigation HTML."""
+
+    def __init__(self, parts, project, master_path, toctree_fn):
+        self.parts = parts
+        self.project = project
+        self.master_path = master_path
+        self.toctree = toctree_fn
+
+    def add_nav_link(self, entry_name, entry_url, li_base_class='toctree-l1', border_top=False):
+        """Add a cross-project navigation link with expand icon.
+
+        Includes an empty <ul> so Furo's get_navigation_tree() adds the
+        checkbox/icon structure. Since cross-project TOC content isn't
+        available, clicking the icon navigates to that project instead
+        of expanding (handled by JS in custom.js).
+        """
+        border = " border-top" if border_top else ""
+        li_class = f'{li_base_class}{border}'
+        self.parts.append(f'<li class="{li_class}">')
+        self.parts.append(f'<a href="{entry_url}">{entry_name}</a>')
+        # Empty <ul> triggers Furo to add has-children class and icon structure
+        self.parts.append('<ul></ul>')
+        self.parts.append('</li>')
+
+    def add_project_nav_item(
+        self,
+        project_name,
+        display_name,
+        url_if_not_current,
+        border_top=False,
+        public_docs=True
+    ):
+        """Add a navigation item in left navbar for a project."""
+        border = " border-top" if border_top else ""
+        if self.project == project_name:
+            self.parts.append(f'<li class="current{border}">')
+            self.parts.append(f'<a class="current-active" href="{self.master_path}">{display_name}</a>')
+            self.parts.append(self.toctree())
+            self.parts.append('</li>')
+            return
+
+        if public_docs:
+            self.add_nav_link(display_name, url_if_not_current, 'navleft-item', border_top)
 
 
 def _generate_crate_navigation_html(context):
@@ -32,7 +88,7 @@ def _generate_crate_navigation_html(context):
         return ""
 
     theme_globaltoc_includehidden = context.get("theme_globaltoc_includehidden", True)
-    def get_toctree(maxdepth=-1, titles_only=True, collapse=False):
+    def _get_toctree(maxdepth=-1, titles_only=True, collapse=False):
         return toctree(
             maxdepth=maxdepth,
             titles_only=titles_only,
@@ -46,35 +102,15 @@ def get_toctree(maxdepth=-1, titles_only=True, collapse=False):
     master_path = context["pathto"](master_doc)
 
     parts = ['<ul class="toctree nav nav-list">']
-
-    def _add_project_nav_item(
-        project_name,
-        display_name,
-        url_if_not_current,
-        border_top=False,
-        include_toctree=True,
-        only_if_current_project=False
-    ):
-        """Add a navigation item in left navbar for a specific project."""
-        border = " border-top" if border_top else ""
-        if project == project_name:
-            parts.append(f'<li class="current{border}">')
-            parts.append(f'<a class="current-active" href="{master_path}">{display_name}</a>')
-            if include_toctree:
-                parts.append(get_toctree())
-            parts.append('</li>')
-        else:
-            if only_if_current_project:
-                return
-            parts.append(f'<li class="navleft-item{border}"><a href="{url_if_not_current}">{display_name}</a></li>')
+    builder = _NavBuilder(parts, project, master_path, _get_toctree)
 
 
     # Special project used standalone
     if project == 'SQL 99':
         current_class = ' class="current"' if pagename == master_doc else ''
         parts.append(f'<li{current_class}>')
         parts.append(f'<a class="current-active" href="{master_path}">SQL-99 Complete, Really</a>')
-        parts.append(get_toctree(maxdepth=2))
+        parts.append(_get_toctree(maxdepth=2))
         parts.append('</li>')
         return ''.join(parts)
 
@@ -86,7 +122,8 @@ def _add_project_nav_item(
     parts.append('</div>')
     parts.append('</li>')
 
-    # Add Overview and top level entries defined in the Guide's toctree
+    # Add Overview and top level entries defined in the Guide's toctree.
+    # The Guide project is the only one that has multiple top-level entries.
     if project == 'CrateDB: Guide':
         if pagename == 'index':
             parts.append('<li class="current">')
@@ -96,24 +133,25 @@ def _add_project_nav_item(
             parts.append('<li class="navleft-item">')
             parts.append(f'<a href="{master_path}">Overview</a>')
             parts.append('</li>')
-        parts.append(get_toctree())
+        parts.append(_get_toctree())
     else:
-        parts.append('<li class="current"><a class="current-active" href="#">Overview</a></li>')
+        # Show Overview link to Guide's index (no icon - it's just an index page)
+        parts.append('<li class="navleft-item"><a href="/docs/guide/">Overview</a></li>')
+        # Add Guide's level 1 entries with icons
+        builder.add_nav_link('Getting Started','/docs/guide/start/')
+        builder.add_nav_link('Handbook', '/docs/guide/handbook/')
 
     # Add individual projects
-    _add_project_nav_item('CrateDB Cloud', 'CrateDB Cloud', '/docs/cloud/')
-    _add_project_nav_item('CrateDB: Reference', 'Reference Manual', '/docs/crate/reference/')
+    builder.add_project_nav_item('CrateDB Cloud', 'CrateDB Cloud', '/docs/cloud/')
+    builder.add_project_nav_item('CrateDB: Reference', 'Reference Manual', '/docs/crate/reference/')
 
     # Start new section with a border
-    _add_project_nav_item('CrateDB: Admin UI', 'Admin UI', '/docs/crate/admin-ui/', border_top=True)
-    _add_project_nav_item('CrateDB: Crash CLI', 'CrateDB CLI', '/docs/crate/crash/')
-    _add_project_nav_item('CrateDB Cloud: Croud CLI', 'Cloud CLI', '/docs/cloud/cli/')
+    builder.add_project_nav_item('CrateDB: Admin UI', 'Admin UI', '/docs/crate/admin-ui/', border_top=True)
+    builder.add_project_nav_item('CrateDB: Crash CLI', 'CrateDB CLI', '/docs/crate/crash/')
+    builder.add_project_nav_item('CrateDB Cloud: Croud CLI', 'Cloud CLI', '/docs/cloud/cli/')
 
     # Add all Driver projects
-    parts.append('<li class="navleft-item">')
-    parts.append('<a href="/docs/guide/connect/drivers.html">Database Drivers</a>')
-    parts.append('</li>')
-
+    # The <ul> must be inside the same <li> for CSS sibling selectors to work
     _DRIVER_CONFIGS = [
         ('CrateDB JDBC', 'JDBC', '/docs/jdbc/'),
         ('CrateDB DBAL', 'PHP DBAL', '/docs/dbal/'),
@@ -122,22 +160,39 @@ def _add_project_nav_item(
         ('SQLAlchemy Dialect', 'SQLAlchemy', '/docs/sqlalchemy-cratedb/'),
     ]
     driver_projects = [config[0] for config in _DRIVER_CONFIGS]
-    if project in driver_projects or (project == 'CrateDB: Guide' and pagename.startswith('connect')):
-        parts.append('<li><ul>')
+    show_drivers = project in driver_projects or (project == 'CrateDB: Guide' and pagename.startswith('connect'))
+
+    # Use data attribute to mark Database Drivers for auto-expansion
+    driver_marker = ' data-auto-expand="true"' if show_drivers else ''
+    # Add current class when viewing a driver page to make it bold
+    driver_class = 'current' if show_drivers else 'navleft-item'
+    driver_link_class = ' class="current-active"' if show_drivers else ''
+    parts.append(f'<li class="{driver_class}"{driver_marker}>')
+    parts.append(f'<a{driver_link_class} href="/docs/guide/connect/drivers.html">Database Drivers</a>')
+    # Furo will add has-children class and icon structure when it detects the <ul>
+    parts.append('<ul>')
+    if show_drivers:
         for proj_name, display_name, url in _DRIVER_CONFIGS:
-            _add_project_nav_item(proj_name, display_name, url)
-        parts.append('</ul></li>')
+            builder.add_project_nav_item(proj_name, display_name, url)
+    parts.append('</ul>')
+    parts.append('</li>')
+
 
     # Add Support and Community links section after a border
     parts.append('<li class="navleft-item border-top"><a target="_blank" href="/support/">Support</a></li>')
     parts.append('<li class="navleft-item"><a target="_blank" href="https://community.cratedb.com/">Community</a></li>')
 
 
     # Other internal docs projects only included in special builds
-    _add_project_nav_item('CrateDB documentation theme', 'Documentation theme', '',
-                          border_top=True, only_if_current_project=True)
-    _add_project_nav_item('Doing Docs', 'Doing Docs at CrateDB', '',
-                          only_if_current_project=True)
+    builder.add_project_nav_item('CrateDB documentation theme', 'Documentation theme', '', border_top=True, public_docs=False)
+    builder.add_project_nav_item('Doing Docs', 'Doing Docs at CrateDB', '', public_docs=False)
+
+    # Show build timestamp for local development (not on Read the Docs)
+    if not os.environ.get('READTHEDOCS'):
+        build_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+        parts.append(f'<li class="navleft-item border-top" style="font-size: 0.75em; color: #888; padding-top: 1em;">')
+        parts.append(f'Built: {build_time}')
+        parts.append('</li>')
 
     parts.append('</ul>')
     return ''.join(parts)
@@ -160,5 +215,16 @@ def add_crate_navigation(app, pagename, templatename, context, doctree):
     # Process through Furo's navigation enhancer
     enhanced_navigation = get_navigation_tree(navigation_html)
 
+    # Make checkbox IDs unique per project to prevent localStorage state collision.
+    # Furo generates sequential IDs (toctree-checkbox-1, toctree-checkbox-2, etc.)
+    # which collide across projects. Add project slug prefix to make them unique.
+    project_slug = _slugify_id(context.get("project", ""))
+    if project_slug:
+        enhanced_navigation = re.sub(
+            r'toctree-checkbox-(\d+)',
+            f'toctree-checkbox-{project_slug}-\\1',
+            enhanced_navigation
+        )
+
     # Add to context for use in templates
     context["crate_navigation_tree"] = enhanced_navigation