@atlaskit/navigation-system/dist/cjs/components/skip-links/focus-element.js

The latest navigation system for Atlassian apps.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.focusElement = focusElement;
var _bindEventListener = require("bind-event-listener");
/**
 * Used for moving focus to the corresponding slot or custom target after clicking on a skip link.
 */
function focusElement(element) {
  /**
   * Elements without an explicit `tabindex` attribute are not guaranteed to be focusable:
   * https://html.spec.whatwg.org/multipage/interaction.html#attr-tabindex
   *
   * Our slots are not interactive, so this is required.
   *
   * In the future we may want to check if there is an existing `tabindex` attribute,
   * as custom skip linked elements might already have one.
   */
  element.setAttribute('tabindex', '-1');

  /**
   * Cleanup the `tabindex` attribute we set when the slot or custom target loses focus.
   *
   * This is preferable to always having `tabindex="-1"` because always applying the tab index can:
   *
   * - mess with click events
   * - potentially cause a focus ring to be always visible
   */
  (0, _bindEventListener.bind)(element, {
    type: 'blur',
    listener: function listener() {
      element.removeAttribute('tabindex');
    },
    options: {
      // Using a one-time listener so it cleans itself up
      once: true
    }
  });

  /**
   * Move focus to the slot or custom target.
   *
   * Calling `.focus()` will also scroll the element into view:
   * https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/focus
   */
  element.focus({
    // Forces the focus ring to appear after moving focus to the slot
    // https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/focus#focusvisible
    focusVisible: true
  });
}