Primer ViewComponents v0.15.0

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<nav aria-label="My favorite foods" data-view-component="true">
  <nav-list>
    <nav-list-group>
      <div data-view-component="true">
        <div data-view-component="true" class="ActionList-sectionDivider">
          <h3 id="heading-title-005887ce-f262-48a8-9fe8-62c05bf97c4c" data-view-component="true" class="ActionList-sectionDivider-title">
            My favorite foods
          </h3>
        </div>
        <ul id="foods" role="list" aria-labelledby="heading-title-005887ce-f262-48a8-9fe8-62c05bf97c4c" data-view-component="true" class="ActionListWrap">
          <li data-targets="nav-list.items nav-list.items" data-item-id="" data-view-component="true" class="ActionListItem">
            <a id="item-9028e1b4-f271-4253-85b8-9b48e5df5c48" href="/foods/popplers" data-view-component="true" class="ActionListContent">
              <span data-view-component="true" class="ActionListItem-label">
                Popplers
              </span></a>
          </li>
          <li data-targets="nav-list.items nav-list.items" data-item-id="" data-view-component="true" class="ActionListItem">
            <a id="item-583fb75d-6e7e-4152-ba39-e77ec41c1d57" href="/foods/slurm" data-view-component="true" class="ActionListContent">
              <span data-view-component="true" class="ActionListItem-label">
                Slurm
              </span></a>
          </li>
        </ul>
        <div src="/view-components/rails-app/nav_list_items" hidden="hidden" data-target="nav-list-group.showMoreItem" data-action="click:nav-list-group#showMore" data-current-page="1" data-total-pages="2" data-targets="nav-list.items nav-list.items" data-item-id="" data-view-component="true" class="ActionListItem">
          <button data-list-id="foods" id="item-301d0d95-3690-4864-9a1c-e7380be5e5ff" data-view-component="true" class="ActionListContent">
            <span data-view-component="true" class="ActionListItem-label color-fg-accent">
              Show more foods
            </span>        <span class="ActionListItem-visual ActionListItem-visual--trailing">
              <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-plus">
                <path d="M7.75 2a.75.75 0 0 1 .75.75V7h4.25a.75.75 0 0 1 0 1.5H8.5v4.25a.75.75 0 0 1-1.5 0V8.5H2.75a.75.75 0 0 1 0-1.5H7V2.75A.75.75 0 0 1 7.75 2Z"></path>
              </svg>
            </span>
          </button>
        </div>
      </div>
    </nav-list-group>
    <li role="presentation" aria-hidden="true" data-view-component="true" class="ActionList-sectionDivider"></li>
    <nav-list-group>
      <div data-view-component="true">
        <div data-view-component="true" class="ActionList-sectionDivider">
          <h3 id="heading-title-7de9772b-ad6b-488a-9718-39ffc8e5b0f5" data-view-component="true" class="ActionList-sectionDivider-title">
            My favorite snacks
          </h3>
        </div>
        <ul id="snacks" role="list" aria-labelledby="heading-title-7de9772b-ad6b-488a-9718-39ffc8e5b0f5" data-view-component="true" class="ActionListWrap">
          <li data-targets="nav-list.items nav-list.items" data-item-id="" data-view-component="true" class="ActionListItem">
            <a id="item-06f6c443-8a7a-416e-acae-c599e9b28ca2" href="/foods/popplers" data-view-component="true" class="ActionListContent">
              <span data-view-component="true" class="ActionListItem-label">
                Popplers
              </span></a>
          </li>
          <li data-targets="nav-list.items nav-list.items" data-item-id="" data-view-component="true" class="ActionListItem">
            <a id="item-94790771-acfc-4f4b-b25a-a668f1e9bbf0" href="/foods/slurm" data-view-component="true" class="ActionListContent">
              <span data-view-component="true" class="ActionListItem-label">
                Slurm
              </span></a>
          </li>
        </ul>
        <div src="/view-components/rails-app/nav_list_items" hidden="hidden" data-target="nav-list-group.showMoreItem" data-action="click:nav-list-group#showMore" data-current-page="1" data-total-pages="4" data-targets="nav-list.items nav-list.items" data-item-id="" data-view-component="true" class="ActionListItem">
          <button data-list-id="snacks" id="item-6f9096f5-f622-49f1-978e-cc34950ba628" data-view-component="true" class="ActionListContent">
            <span data-view-component="true" class="ActionListItem-label color-fg-accent">
              Show more snacks
            </span>        <span class="ActionListItem-visual ActionListItem-visual--trailing">
              <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-plus">
                <path d="M7.75 2a.75.75 0 0 1 .75.75V7h4.25a.75.75 0 0 1 0 1.5H8.5v4.25a.75.75 0 0 1-1.5 0V8.5H2.75a.75.75 0 0 1 0-1.5H7V2.75A.75.75 0 0 1 7.75 2Z"></path>
              </svg>
            </span>
          </button>
        </div>
      </div>
    </nav-list-group>
  </nav-list>
</nav>
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render(Primer::Beta::NavList.new(aria: { label: "My favorite foods" })) do |list|
  list.with_group(id: "foods") do |group|
    group.with_heading(title: "My favorite foods")
    group.with_item(label: "Popplers", href: "/foods/popplers")
    group.with_item(label: "Slurm", href: "/foods/slurm")
    group.with_show_more_item(label: "Show more foods", src: UrlHelpers.nav_list_items_path, pages: 2) do |item|
      item.with_trailing_visual_icon(icon: :plus)
    end
  end
  list.with_group(id: "snacks") do |group|
    group.with_heading(title: "My favorite snacks")
    group.with_item(label: "Popplers", href: "/foods/popplers")
    group.with_item(label: "Slurm", href: "/foods/slurm")
    group.with_show_more_item(label: "Show more snacks", src: UrlHelpers.nav_list_items_path, pages: 4) do |item|
      item.with_trailing_visual_icon(icon: :plus)
    end
  end
end

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No params configured.

app/components/primer/beta/nav_list.ts

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/* eslint-disable custom-elements/expose-class-on-global */
import {controller, targets} from '@github/catalyst'
@controller
export class NavListElement extends HTMLElement {
  @targets items: HTMLElement[]
  selectItemById(itemId: string | null): boolean {
    if (!itemId) return false
    const selectedItem = this.#findSelectedNavItemById(itemId)
    if (selectedItem) {
      this.#select(selectedItem)
      return true
    }
    return false
  }
  selectItemByHref(href: string | null): boolean {
    if (!href) return false
    const selectedItem = this.#findSelectedNavItemByHref(href)
    if (selectedItem) {
      this.#select(selectedItem)
      return true
    }
    return false
  }
  selectItemByCurrentLocation(): boolean {
    const selectedItem = this.#findSelectedNavItemByCurrentLocation()
    if (selectedItem) {
      this.#select(selectedItem)
      return true
    }
    return false
  }
  // expand collapsible item onClick
  expandItem(item: HTMLElement) {
    item.nextElementSibling?.removeAttribute('data-hidden')
    item.setAttribute('aria-expanded', 'true')
  }
  collapseItem(item: HTMLElement) {
    item.nextElementSibling?.setAttribute('data-hidden', '')
    item.setAttribute('aria-expanded', 'false')
    item.focus()
  }
  itemIsExpanded(item: HTMLElement | null) {
    if (item?.tagName === 'A') {
      return true
    }
    return item?.getAttribute('aria-expanded') === 'true'
  }
  // expand/collapse item
  handleItemWithSubItemClick(e: Event) {
    const el = e.target
    if (!(el instanceof HTMLElement)) return
    const button = el.closest<HTMLButtonElement>('button')
    if (!button) return
    if (this.itemIsExpanded(button)) {
      this.collapseItem(button)
    } else {
      this.expandItem(button)
    }
    e.stopPropagation()
  }
  // collapse item
  handleItemWithSubItemKeydown(e: KeyboardEvent) {
    const el = e.currentTarget
    if (!(el instanceof HTMLElement)) return
    let button = el.closest<HTMLButtonElement>('button')
    if (!button) {
      const button_id = el.getAttribute('aria-labelledby')
      if (button_id) {
        button = document.getElementById(button_id) as HTMLButtonElement
      } else {
        return
      }
    }
    if (this.itemIsExpanded(button) && e.key === 'Escape') {
      this.collapseItem(button)
    }
    e.stopPropagation()
  }
  #findSelectedNavItemById(itemId: string): HTMLElement | null {
    // First we compare the selected link to data-item-id for each nav item
    for (const navItem of this.items) {
      if (navItem.classList.contains('ActionListItem--hasSubItem')) {
        continue
      }
      const keys = navItem.getAttribute('data-item-id')?.split(' ') || []
      if (keys.includes(itemId)) {
        return navItem
      }
    }
    return null
  }
  #findSelectedNavItemByHref(href: string): HTMLElement | null {
    // If we didn't find a match, we compare the selected link to the href of each nav item
    const selectedNavItem = this.querySelector<HTMLAnchorElement>(`.ActionListContent[href="${href}"]`)
    if (selectedNavItem) {
      return selectedNavItem.closest('.ActionListItem')
    }
    return null
  }
  #findSelectedNavItemByCurrentLocation(): HTMLElement | null {
    return this.#findSelectedNavItemByHref(window.location.pathname)
  }
  #select(navItem: HTMLElement) {
    const currentlySelectedItem = this.querySelector('.ActionListItem--navActive') as HTMLElement
    if (currentlySelectedItem) this.#deselect(currentlySelectedItem)
    navItem.classList.add('ActionListItem--navActive')
    if (navItem.children.length > 0) {
      navItem.children[0].setAttribute('aria-current', 'page')
    }
    const parentMenu = this.#findParentMenu(navItem)
    if (parentMenu) {
      this.expandItem(parentMenu)
      parentMenu.classList.add('ActionListContent--hasActiveSubItem')
    }
  }
  #deselect(navItem: HTMLElement) {
    navItem.classList.remove('ActionListItem--navActive')
    if (navItem.children.length > 0) {
      navItem.children[0].removeAttribute('aria-current')
    }
    const parentMenu = this.#findParentMenu(navItem)
    if (parentMenu) {
      this.collapseItem(parentMenu)
      parentMenu.classList.remove('ActionListContent--hasActiveSubItem')
    }
  }
  #findParentMenu(navItem: HTMLElement): HTMLElement | null {
    if (!navItem.classList.contains('ActionListItem--subItem')) return null
    const parent = navItem.closest('li.ActionListItem--hasSubItem')?.querySelector('button.ActionListContent')
    if (parent) {
      return parent as HTMLElement
    } else {
      return null
    }
  }
}
declare global {
  interface Window {
    NavListElement: typeof NavListElement
  }
}