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Viewing file:     a11y.js (5.98 KB)      -rw-r--r--

import $ from '../../utils/dom';
import Utils from '../../utils/utils';

const a11y = {
  makeElFocusable($el) {
    $el.attr('tabIndex', '0');
    return $el;
  },
  addElRole($el, role) {
    $el.attr('role', role);
    return $el;
  },
  addElLabel($el, label) {
    $el.attr('aria-label', label);
    return $el;
  },
  disableEl($el) {
    $el.attr('aria-disabled', true);
    return $el;
  },
  enableEl($el) {
    $el.attr('aria-disabled', false);
    return $el;
  },
  onEnterKey(e) {
    const swiper = this;
    const params = swiper.params.a11y;
    if (e.keyCode !== 13) return;
    const $targetEl = $(e.target);
    if (swiper.navigation && swiper.navigation.$nextEl && $targetEl.is(swiper.navigation.$nextEl)) {
      if (!(swiper.isEnd && !swiper.params.loop)) {
        swiper.slideNext();
      }
      if (swiper.isEnd) {
        swiper.a11y.notify(params.lastSlideMessage);
      } else {
        swiper.a11y.notify(params.nextSlideMessage);
      }
    }
    if (swiper.navigation && swiper.navigation.$prevEl && $targetEl.is(swiper.navigation.$prevEl)) {
      if (!(swiper.isBeginning && !swiper.params.loop)) {
        swiper.slidePrev();
      }
      if (swiper.isBeginning) {
        swiper.a11y.notify(params.firstSlideMessage);
      } else {
        swiper.a11y.notify(params.prevSlideMessage);
      }
    }
    if (swiper.pagination && $targetEl.is(`.${swiper.params.pagination.bulletClass}`)) {
      $targetEl[0].click();
    }
  },
  notify(message) {
    const swiper = this;
    const notification = swiper.a11y.liveRegion;
    if (notification.length === 0) return;
    notification.html('');
    notification.html(message);
  },
  updateNavigation() {
    const swiper = this;

    if (swiper.params.loop) return;
    const { $nextEl, $prevEl } = swiper.navigation;

    if ($prevEl && $prevEl.length > 0) {
      if (swiper.isBeginning) {
        swiper.a11y.disableEl($prevEl);
      } else {
        swiper.a11y.enableEl($prevEl);
      }
    }
    if ($nextEl && $nextEl.length > 0) {
      if (swiper.isEnd) {
        swiper.a11y.disableEl($nextEl);
      } else {
        swiper.a11y.enableEl($nextEl);
      }
    }
  },
  updatePagination() {
    const swiper = this;
    const params = swiper.params.a11y;
    if (swiper.pagination && swiper.params.pagination.clickable && swiper.pagination.bullets && swiper.pagination.bullets.length) {
      swiper.pagination.bullets.each((bulletIndex, bulletEl) => {
        const $bulletEl = $(bulletEl);
        swiper.a11y.makeElFocusable($bulletEl);
        swiper.a11y.addElRole($bulletEl, 'button');
        swiper.a11y.addElLabel($bulletEl, params.paginationBulletMessage.replace(/{{index}}/, $bulletEl.index() + 1));
      });
    }
  },
  init() {
    const swiper = this;

    swiper.$el.append(swiper.a11y.liveRegion);

    // Navigation
    const params = swiper.params.a11y;
    let $nextEl;
    let $prevEl;
    if (swiper.navigation && swiper.navigation.$nextEl) {
      $nextEl = swiper.navigation.$nextEl;
    }
    if (swiper.navigation && swiper.navigation.$prevEl) {
      $prevEl = swiper.navigation.$prevEl;
    }
    if ($nextEl) {
      swiper.a11y.makeElFocusable($nextEl);
      swiper.a11y.addElRole($nextEl, 'button');
      swiper.a11y.addElLabel($nextEl, params.nextSlideMessage);
      $nextEl.on('keydown', swiper.a11y.onEnterKey);
    }
    if ($prevEl) {
      swiper.a11y.makeElFocusable($prevEl);
      swiper.a11y.addElRole($prevEl, 'button');
      swiper.a11y.addElLabel($prevEl, params.prevSlideMessage);
      $prevEl.on('keydown', swiper.a11y.onEnterKey);
    }

    // Pagination
    if (swiper.pagination && swiper.params.pagination.clickable && swiper.pagination.bullets && swiper.pagination.bullets.length) {
      swiper.pagination.$el.on('keydown', `.${swiper.params.pagination.bulletClass}`, swiper.a11y.onEnterKey);
    }
  },
  destroy() {
    const swiper = this;
    if (swiper.a11y.liveRegion && swiper.a11y.liveRegion.length > 0) swiper.a11y.liveRegion.remove();

    let $nextEl;
    let $prevEl;
    if (swiper.navigation && swiper.navigation.$nextEl) {
      $nextEl = swiper.navigation.$nextEl;
    }
    if (swiper.navigation && swiper.navigation.$prevEl) {
      $prevEl = swiper.navigation.$prevEl;
    }
    if ($nextEl) {
      $nextEl.off('keydown', swiper.a11y.onEnterKey);
    }
    if ($prevEl) {
      $prevEl.off('keydown', swiper.a11y.onEnterKey);
    }

    // Pagination
    if (swiper.pagination && swiper.params.pagination.clickable && swiper.pagination.bullets && swiper.pagination.bullets.length) {
      swiper.pagination.$el.off('keydown', `.${swiper.params.pagination.bulletClass}`, swiper.a11y.onEnterKey);
    }
  },
};
export default {
  name: 'a11y',
  params: {
    a11y: {
      enabled: true,
      notificationClass: 'swiper-notification',
      prevSlideMessage: 'Previous slide',
      nextSlideMessage: 'Next slide',
      firstSlideMessage: 'This is the first slide',
      lastSlideMessage: 'This is the last slide',
      paginationBulletMessage: 'Go to slide {{index}}',
    },
  },
  create() {
    const swiper = this;
    Utils.extend(swiper, {
      a11y: {
        liveRegion: $(`<span class="${swiper.params.a11y.notificationClass}" aria-live="assertive" aria-atomic="true"></span>`),
      },
    });
    Object.keys(a11y).forEach((methodName) => {
      swiper.a11y[methodName] = a11y[methodName].bind(swiper);
    });
  },
  on: {
    init() {
      const swiper = this;
      if (!swiper.params.a11y.enabled) return;
      swiper.a11y.init();
      swiper.a11y.updateNavigation();
    },
    toEdge() {
      const swiper = this;
      if (!swiper.params.a11y.enabled) return;
      swiper.a11y.updateNavigation();
    },
    fromEdge() {
      const swiper = this;
      if (!swiper.params.a11y.enabled) return;
      swiper.a11y.updateNavigation();
    },
    paginationUpdate() {
      const swiper = this;
      if (!swiper.params.a11y.enabled) return;
      swiper.a11y.updatePagination();
    },
    destroy() {
      const swiper = this;
      if (!swiper.params.a11y.enabled) return;
      swiper.a11y.destroy();
    },
  },
};