refactor(ui): Remove unused Bootstrap Collapse from sidebar navigation

Remove Bootstrap Collapse instances and section link handling logic that
is no longer needed. Simplifies sidebar navigation by removing manual
collapse management and related event handlers.

Fixes #22931

netbox/project-static/src/sidenav.ts

@@ -1,10 +1,8 @@
-import { Collapse } from 'bootstrap';
 import { StateManager } from './state';
 import { getElements, isElement } from './util';
 
 type NavState = { pinned: boolean };
 type BodyAttr = 'show' | 'hide' | 'hidden' | 'pinned';
-type Section = [HTMLAnchorElement, InstanceType<typeof Collapse>];
 
 class SideNav {
   /**
@@ -17,16 +15,6 @@ class SideNav {
    */
   private state: StateManager<NavState>;
 
-  /**
-   * The currently active parent nav-link controlling a section.
-   */
-  private activeLink: Nullable<HTMLAnchorElement> = null;
-
-  /**
-   * All collapsible sections and their controlling nav-links.
-   */
-  private sections: Section[] = [];
-
   constructor(base: HTMLElement) {
     this.base = base;
     this.state = new StateManager<NavState>(
@@ -35,7 +23,6 @@ class SideNav {
     );
 
     this.init();
-    this.initSectionLinks();
     this.initLinks();
   }
 
@@ -114,7 +101,7 @@ class SideNav {
   }
 
   /**
-   * Hide the sidenav and collapse all active nav sections.
+   * Hide the sidenav and close any nested collapse elements.
    */
   private hide(): void {
     this.bodyAdd('hidden');
@@ -146,55 +133,8 @@ class SideNav {
   }
 
   /**
-   * When a section's controlling nav-link is clicked, update this instance's `activeLink`
-   * attribute and close all other sections.
-   */
-  private handleSectionClick(event: Event): void {
-    event.preventDefault();
-    const element = event.target as HTMLAnchorElement;
-    this.activeLink = element;
-    this.closeInactiveSections();
-  }
-
-  /**
-   * Close all sections that are not associated with the currently active link (`activeLink`).
-   */
-  private closeInactiveSections(): void {
-    for (const [link, collapse] of this.sections) {
-      if (link !== this.activeLink) {
-        link.classList.add('collapsed');
-        link.setAttribute('aria-expanded', 'false');
-        collapse.hide();
-      }
-    }
-  }
-
-  /**
-   * Initialize `bootstrap.Collapse` instances on all section collapse elements and add event
-   * listeners to the controlling nav-links.
-   */
-  private initSectionLinks(): void {
-    for (const section of getElements<HTMLAnchorElement>(
-      '.navbar-nav .nav-item .nav-link[data-bs-toggle]',
-    )) {
-      if (section.parentElement !== null) {
-        const collapse = section.parentElement.querySelector<HTMLDivElement>('.collapse');
-        if (collapse !== null) {
-          const collapseInstance = new Collapse(collapse, {
-            toggle: false, // Don't automatically open the collapse element on invocation.
-          });
-          this.sections.push([section, collapseInstance]);
-          section.addEventListener('click', event => this.handleSectionClick(event));
-        }
-      }
-    }
-  }
-
-  /**
-   * Starting from the bottom-most active link in the element tree, work backwards to determine the
-   * link's containing `.collapse` element and the `.collapse` element's containing `.nav-link`
-   * element. Once found, expand (or collapse) the `.collapse` element and add (or remove) the
-   * `.active` class to the the parent `.nav-link` element.
+   * Expand or collapse the `.dropdown-menu` containing an active link, and toggle the `active`
+   * class on the link and on its containing `.nav-item`.
    *
    * @param link Active nav link
    * @param action Expand or Collapse
@@ -233,7 +173,7 @@ class SideNav {
     for (const menuitem of this.base.querySelectorAll<HTMLDivElement>(
       'ul.navbar-nav .nav-item .dropdown-item',
     )) {
-      const link = menuitem.querySelector<HTMLAnchorElement>('a')
+      const link = menuitem.querySelector<HTMLAnchorElement>('a');
       if (link) {
         const href = new RegExp(link.href, 'gi');
         if (window.location.href.match(href)) {
@@ -244,7 +184,7 @@ class SideNav {
   }
 
   /**
-   * Show the sidenav and expand any active sections.
+   * Show the sidenav and expand any active menu groups.
    */
   private onEnter(): void {
     if (!this.bodyHas('pinned')) {
@@ -257,7 +197,7 @@ class SideNav {
   }
 
   /**
-   * Hide the sidenav and collapse any active sections.
+   * Hide the sidenav and collapse any active menu groups.
    */
   private onLeave(): void {
     if (!this.bodyHas('pinned')) {