Primer ViewComponents v0.35.1

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<nav aria-label="My favorite foods" data-view-component="true">
  <nav-list>
    <nav-list-group>
      <action-list>
        <div data-view-component="true">
          <div data-view-component="true" class="ActionList-sectionDivider">
            <h3 id="heading-title-e5d98750-b45c-4c7c-a11c-afdd8fb08241" data-view-component="true" class="ActionList-sectionDivider-title">
              My favorite foods
            </h3>
          </div>
          <ul id="foods" role="list" aria-labelledby="heading-title-e5d98750-b45c-4c7c-a11c-afdd8fb08241" data-view-component="true" class="ActionListWrap">
            <li data-item-id="" data-targets="nav-list.items" data-view-component="true" class="ActionListItem">
              <a id="item-247ef17d-234a-4c84-b411-1dc01419c10b" href="/foods/popplers" data-view-component="true" class="ActionListContent">
                <span data-view-component="true" class="ActionListItem-label">
                  Popplers
                </span>
              </a>
            </li>
            <li data-item-id="" data-targets="nav-list.items" data-view-component="true" class="ActionListItem">
              <a id="item-bf462ca2-ff31-4296-b5fd-b42b80fdb947" 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-item-id="" data-targets="nav-list.items" data-view-component="true" class="ActionListItem">
            <button data-list-id="foods" id="item-0b794ba5-e2e6-4b06-bed7-9b64d68274d3" 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>
      </action-list>
    </nav-list-group>
    <li role="presentation" aria-hidden="true" data-view-component="true" class="ActionList-sectionDivider"></li>
    <nav-list-group>
      <action-list>
        <div data-view-component="true">
          <div data-view-component="true" class="ActionList-sectionDivider">
            <h3 id="heading-title-a85d2c04-4181-40f3-a48b-c3bbdfc0f2ed" data-view-component="true" class="ActionList-sectionDivider-title">
              My favorite snacks
            </h3>
          </div>
          <ul id="snacks" role="list" aria-labelledby="heading-title-a85d2c04-4181-40f3-a48b-c3bbdfc0f2ed" data-view-component="true" class="ActionListWrap">
            <li data-item-id="" data-targets="nav-list.items" data-view-component="true" class="ActionListItem">
              <a id="item-f7c8b44f-c8cc-4d8f-9933-e0cfddf2545e" href="/foods/popplers" data-view-component="true" class="ActionListContent">
                <span data-view-component="true" class="ActionListItem-label">
                  Popplers
                </span>
              </a>
            </li>
            <li data-item-id="" data-targets="nav-list.items" data-view-component="true" class="ActionListItem">
              <a id="item-ead247c4-e355-4115-adf5-d41ff30f8913" 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-item-id="" data-targets="nav-list.items" data-view-component="true" class="ActionListItem">
            <button data-list-id="snacks" id="item-a09314e3-553f-43cb-ac07-16b39969fb15" 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>
      </action-list>
    </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

No notes provided.

No params configured.

app/components/primer/beta/nav_list.ts

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/* eslint-disable custom-elements/expose-class-on-global */
import {controller, target, targets} from '@github/catalyst'
import {ActionListTruncationObserver} from '../alpha/action_list'
@controller
export class NavListElement extends HTMLElement {
  @targets items: HTMLElement[]
  @target topLevelList: HTMLElement
  #truncationObserver: ActionListTruncationObserver
  connectedCallback() {
    // groups are wrapped in <action-list>, which handles resizing on its own
    if (this.topLevelList) {
      this.#truncationObserver = new ActionListTruncationObserver(this.topLevelList)
    }
  }
  disconnectedCallback() {
    if (this.topLevelList) {
      this.#truncationObserver.unobserve(this.topLevelList)
    }
  }
  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)
    }
    /* eslint-disable-next-line no-restricted-syntax */
    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)
    }
    /* eslint-disable-next-line no-restricted-syntax */
    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
  }
}