Nuclear Pizza Machine

    @cagov/ds-content-navigation

    2.0.0 • Public • Published

    Page navigation

    Page navigation lists and links to the level 2 headings (H2) of a webpage. It is placed at the top of the page on the left. People can select a link to go directly to that section. The links are introduced by the text On this page by default. The page navigation does not show if there are zero or one H2’s on the page.

    Page navigation makes it easy to see what’s on a page. It allows people to scan a page and know if they’re in the right place.

    When and how to use it

    Use this component on pages with two or more H2’s. You’ll probably use page navigation on most of your pages.

    How not to use it

    Do not use this component to replace or duplicate site navigation.

    Demo and sample markup

    <cagov-content-navigation data-selector=".main" data-type="wordpress" data-label="On this page"></cagov-content-navigation>

    Specs

    Property Value
    Machine name ds-content-navigation
    JavaScript yes
    SCSS ./src/index.scss

    Project installation

    The instructions assume familiarity with npm package management tool, modern JavaScript techniques, and Sass.

    1. npm i @cagov/[machine-name]
    2. Use import¹ or require to include the component’s *JavaScript** in your page or compiler.
    3. Include SCSS in your Sass compiler.
    4. Add the Sample markup to your HTML.
    5. Refer to the Content model section for notes on mapping your data to the Sample markup.

    CSS variables

    The following CSS variables are used in this component

    • --gray-300

    All CSS variables define their own fallback value so you do not have to use additional CSS unless you want to change them. You may define your own value for the variable by adding your own style rules. Here is an example defining the global hex value for a CSS variable named “—primary-color”:

    :root {
      --primary-color: #064e66;
    }

    Accessibility

    Review items specific to the page navigation accessibility

    • Make sure that content navigation component is using a navigation landmark (enclosed into nav tag) and has ARIA label (has aria-labelledby attribute).
    • Make sure that content menu’s visual heading (which is usually “On this page”) has id attribute that is referenced in nav’s aria-labelledby attribute.
    • Ensure that menu items are keyboard operable and focus is never hidden from users.
    • Make sure that each nav item has solid, 2px outline that is using —-highlight-color variable on focused state.

    Standard accessibility review

    Components in Alpha status must pass the following accessibility reviews every time a new version is published:

    • Tested with the [axe](https://www.deque.com/axe/) accessibility tool and passes all automated WCAG Level AA checks
    • Reviewed with the VoiceOver screen reader on desktop
    • Verified keyboard navigation and that all actionable elements of the component are reachable via keyboard commands only
    • Reviewed component layout on a variety of screen sizes

    Components in Beta status must pass the following accessibility reviews every time a new version is published:

    • Tested with the [axe](https://www.deque.com/axe/) accessibility tool and passes all automated WCAG Level AA checks
    • Reviewed with the VoiceOver screen reader on desktop
    • Reviewed with the TalkBack screen reader on mobile.
    • Verified keyboard navigation and that all actionable elements of the component are reachable via keyboard commands only
    • Reviewed component layout on a variety of screen sizes
    • Reviewed component display using content in English, Spanish, Simplified Chinese, German, and Arabic (using right to left display (RTL))

    Progressive enhancement

    This component uses a custom element defined in JavaScript in addition to HTML and CSS. Edge, Firefox, Safari, and Chrome support custom elements. If the JavaScript for this component is not delivered or supported, the component will not display. This is the desired behavior because this component is not critical for site interaction. It uses CSS variables to inherit design token values. Token definitions are not required because these style rules provide fallback values.

    Content model

    This component uses the following data attributes. We provide this information to help with integrating the component into backend publishing systems or identifying content that may require translation.

    Name Attribute name Description Data type Field type Default
    Label data-label Label for the page index string Plain text “On this page”
    Selector data-selector HTML selector to parse to locate H2 elements string Plain text main
    Editor type data-type Editor string Plain text wordpress (currenly only supports WordPress)
    • Index is auto-generated by JavaScript using H2 elements found within the data-selector.

    Contributor/developer documenation

    Run: npm run start at the repository root to preview elements. This will launch local server with links to component demo pages.

    The documentation is generated using the custom elements manifest schema draft standard analyzer command. Here is an example run outside the accordion directory:

    wca analyze src --format json --outFile custom-elements.json

    Keywords

    none

    Install

    npm i @cagov/ds-content-navigation

    DownloadsWeekly Downloads

    1

    Version

    2.0.0

    License

    ISC

    Unpacked Size

    105 kB

    Total Files

    15

    Last publish

    Collaborators

    • zakiyak
    • timothyshambra
    • xjensen
    • carter.medlin
    • aaronhans
    • chacha-california
    • kkoryaka