Chọn nhiều lần

Mẫu này cho biết cách tạo một thành phần thích ứng, thích ứng và dễ tiếp cận, có nhiều lựa chọn để sắp xếp và lọc trải nghiệm người dùng.

Bài viết đầy đủ · Video trên YouTube · Nguồn trên GitHub

HTML

<main>
  <header>
    <h1>Lighting</h1>
    <small>Find your perfect light</small>
  </header>
  <aside>
    <form>
      <select multiple="true" title="Filter results by category">
        <optgroup label="New">
          <option value="last 30 days">Last 30 Days</option>
          <option value="last 6 months">Last 6 Months</option>
        </optgroup>
        <optgroup label="Lamps">
          <option value="table lamps">Table Lamps</option>
          <option value="desk lamps">Desk Lamps</option>
          <option value="floor lamps">Floor Lamps</option>
        </optgroup>
        <optgroup label="Ceiling">
          <option value="chandeliers">Chandeliers</option>
          <option value="pendant">Pendant</option>
          <option value="flush">Flush</option>
          <option value="fans">Fans</option>
        </optgroup>
        <optgroup label="By Room">
          <option value="bedroom">Bedroom</option>
          <option value="dining room">Dining Room</option>
          <option value="kitchen">Kitchen</option>
          <option value="living room">Living Room</option>
          <option value="bathroom">Bathroom</option>
          <option value="entryway">Entryway</option>
          <option value="outdoor">Outdoor</option>
        </optgroup>
        <optgroup label="Kids">
          <option value="lamps">Lamps</option>
          <option value="night lights">Night Lights</option>
          <option value="ceiling">Ceiling</option>
        </optgroup>
      </select>
      
      <fieldset>
        <legend>New</legend>
        <div>
          <input type="checkbox" id="last-30-days" name="new" value="last 30 days">
          <label for="last-30-days">Last 30 Days</label>
        </div>
        <div>
          <input type="checkbox" id="last-6-months" name="new" value="last 6 months">
          <label for="last-6-months">Last 6 Months</label>
        </div>
      </fieldset>
      <fieldset>
        <legend>Lamps</legend>
        <div>
          <input type="checkbox" id="table-lamps" name="lamps" value="table lamps">
          <label for="table-lamps">Table Lamps</label>
        </div>
        <div>
          <input type="checkbox" id="desk-lamps" name="lamps" value="desk lamps">
          <label for="desk-lamps">Desk Lamps</label>
        </div>
        <div>
          <input type="checkbox" id="floor-lamps" name="lamps" value="floor lamps">
          <label for="floor-lamps">Floor Lamps</label>
        </div>
      </fieldset>
      <fieldset>
        <legend>Ceiling</legend>
        <div>
          <input type="checkbox" id="chandeliers" name="ceiling" value="chandeliers">
          <label for="chandeliers">Chandeliers</label>
        </div>
        <div>
          <input type="checkbox" id="pendant" name="ceiling" value="pendant">
          <label for="pendant">Pendant</label>
        </div>
        <div>
          <input type="checkbox" id="flush" name="ceiling" value="flush">
          <label for="flush">Flush</label>
        </div>
        <div>
          <input type="checkbox" id="fans" name="ceiling" value="fans">
          <label for="fans">Fans</label>
        </div>
      </fieldset>
      <fieldset>
        <legend>By Room</legend>
        <div>
          <input type="checkbox" id="bedroom" name="by room" value="bedroom">
          <label for="bedroom">Bedroom</label>
        </div>
        <div>
          <input type="checkbox" id="dining-room" name="by room" value="dining room">
          <label for="dining-room">Dining Room</label>
        </div>
        <div>
          <input type="checkbox" id="kitchen" name="by room" value="kitchen">
          <label for="kitchen">Kitchen</label>
        </div>
        <div>
          <input type="checkbox" id="living-room" name="by room" value="living room">
          <label for="living-room">Living Room</label>
        </div>
        <div>
          <input type="checkbox" id="bathroom" name="by room" value="bathroom">
          <label for="bathroom">Bathroom</label>
        </div>
        <div>
          <input type="checkbox" id="entryway" name="by room" value="entryway">
          <label for="entryway">Entryway</label>
        </div>
        <div>
          <input type="checkbox" id="outdoor" name="by room" value="outdoor">
          <label for="outdoor">Outdoor</label>
        </div>
      </fieldset>
      <fieldset>
        <legend>Kids</legend>
        <div>
          <input type="checkbox" id="lamps" name="kids" value="lamps">
          <label for="lamps">Lamps</label>
        </div>
        <div>
          <input type="checkbox" id="night-lights" name="kids" value="night lights">
          <label for="night-lights">Night Lights</label>
        </div>
        <div>
          <input type="checkbox" id="ceiling" name="kids" value="ceiling">
          <label for="ceiling">Ceiling</label>
        </div>
      </fieldset>
    </form>
    <div role="status" class="sr-only" id="applied-filters"></div>
  </aside>
  <article>
    <span class="last-30-days table-lamps"></span>
    <span class="last-6-months desk-lamps"></span>
    <span class="floor-lamps"></span>
    <span class="last-6-months chandeliers"></span>
    <span class="pendant last-6-months"></span>
    <span class="flush fans"></span>
    <span class="fans pendant table-lamps"></span>
    <span class="bedroom"></span>
    <span class="dining-room last-30-days chandeliers"></span>
    <span class="kitchen lamps"></span>
    <span class="living-room"></span>
    <span class="bathroom living-room chandeliers desk-lamps"></span>
    <span class="bathroom table-lamps desk-lamps"></span>
    <span class="entryway last-30-days"></span>
    <span class="outdoor desk-lamps"></span>
    <span class="lamps last-30-days"></span>
    <span class="night-lights table-lamps"></span>
    <span class="ceiling last-30-days"></span>
    <span class="floor-lamps table-lamps"></span>
    <span class="floor-lamps last-6-months"></span>
    <span class="dining-room last-30-days chandeliers"></span>
    <span class="kitchen lamps"></span>
    <span class="living-room"></span>
    <span class="bathroom living-room chandeliers desk-lamps"></span>
  </article>
</main>

CSS

        main {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 5vmin;
  align-items: flex-start;

  & > header {
    grid-column: 1 / -1;
  }

  @media (orientation: portrait) {
    grid-template-columns: 1fr;
  }

  @media (--useSelect) {
    & > article {
      grid-row: 3;
      grid-column: 1 / -1;
    }
  }
}

article {
  --size: min(300px, calc(25% - 2ch));
  margin: -1ch;

  & > span {
    will-change: transform;
    background: hsl(0 0% 50% / 25%);
    border-radius: 10px;
    inline-size: var(--size);
    block-size: 15ch;
    margin: 1ch;

    @media (orientation: portrait) {
      --size: calc(50% - 2ch);
    }

    @supports (aspect-ratio: 1) {
      block-size: auto;
      aspect-ratio: 1;
    }
  }
}

header {
  display: grid;
  gap: 1ch;
}

aside {
  counter-reset: filters;

  & :checked {
    counter-increment: filters; 
  }

  & #applied-filters::before {
    content: counter(filters) " filters ";
  }
}

fieldset:first-of-type {
  margin-block-start: -5px;
}

[role="status"] {
  @media (--useSelect) {
    display: none;
  }
}

.sr-only {
  inline-size: 0;
  block-size: 0;
  overflow: hidden;
}
        

JS

        import 'https://unpkg.com/isotope-layout@3.0.6/dist/isotope.pkgd.min.js'

const IsotopeGrid = new Isotope( 'article', {
  itemSelector: 'span',
  layoutMode: 'fitRows',
  percentPosition: true
})
  
const filterGrid = query => {
  const { matches:motionOK } = window.matchMedia(
    '(prefers-reduced-motion: no-preference)'
  )
  
  IsotopeGrid.arrange({
    filter: query,
    stagger: 25,
    transitionDuration: motionOK ? '0.4s' : 0,
  })
}

// takes a  and returns the selection as an array
const prepareSelectOptions = element =>
  Array.from(element.selectedOptions).reduce((data, opt) => {
    data.push([opt.parentElement.label.toLowerCase(), opt.value])
    return data
  }, [])

//  watcher
document.querySelector('select').addEventListener('input', e => {
  let selectData = prepareSelectOptions(e.target)
  console.warn('Multiselect', selectData)

  // DEMO
  // isotope query assembly from checkbox selections
  let query = selectData.reduce((query, val) => {
    query.push('.' + val[1].split(' ').join('-'))
    return query
  }, []).join(',')

  filterGrid(query)

  // update for assistive technology
  let statusRoleElement = document.querySelector('#applied-filters')
  let filterResults = IsotopeGrid.getFilteredItemElements().length

  statusRoleElement.style.counterSet = selectData.length
  statusRoleElement.textContent = " giving " + filterResults + " results"
})

document
  .querySelector('aside form')
  .addEventListener('input', e => {
    if (e.target.nodeName === 'SELECT') return
      
    const formData = new FormData(document.querySelector('form'))
    console.warn('Checkboxes', Array.from(formData.entries()))

    // DEMO
    // isotope query assembly from checkbox selections
    let query = Array.from(formData.values()).reduce((query, val) => {
      query.push('.' + val.split(' ').join('-'))
      return query
    }, []).join(',')

    filterGrid(query)

    document.querySelector('#applied-filters').textContent = " giving " + IsotopeGrid.getFilteredItemElements().length + " results"
  })