Câu chuyện

Mẫu này trình bày cách xây dựng một thành phần Stories cho web có tính thích ứng, hỗ trợ di chuyển bằng bàn phím và hoạt động trên nhiều trình duyệt.

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

HTML

<div class="stories"> 
  <section class="user">
    <article class="story" style="--bg: url(https://picsum.photos/480/840);"></article> 
    <article class="story" style="--bg: url(https://picsum.photos/480/841);"></article>
  </section>
  <section class="user">
    <article class="story" style="--bg: url(https://picsum.photos/481/840);"></article>
  </section>
  <section class="user">
    <article class="story" style="--bg: url(https://picsum.photos/481/841);"></article>
  </section>
  <section class="user">
    <article class="story" style="--bg: url(https://picsum.photos/482/840);"></article>
    <article class="story" style="--bg: url(https://picsum.photos/482/843);"></article>
    <article class="story" style="--bg: url(https://picsum.photos/482/844);"></article>
  </section>
</div>

CSS

        .stories {
  display: grid;
  grid: 1fr / auto-flow 100%;
  grid-gap: 1ch;
  gap: 1ch;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  overscroll-behavior: contain;
  touch-action: pan-x;
}

.user {
  scroll-snap-align: start;
  scroll-snap-stop: always;
  display: grid;
  grid: [story] 1fr / [story] 1fr;
}

.story {
  grid-area: story;

  background-size: cover;
  background-image: 
    var(--bg), 
    linear-gradient(to top, rgb(249, 249, 249), rgb(226, 226, 226));

  user-select: none;
  touch-action: manipulation;

  transition: opacity .3s cubic-bezier(0.4, 0.0, 1, 1)
}

.story.seen {
  opacity: 0;
  pointer-events: none;
}
        

JS

        const stories = document.querySelector('.stories')
const median = stories.offsetLeft + (stories.clientWidth / 2)

const state = {
  current_story: stories.firstElementChild.lastElementChild
}

const navigateStories = direction => {
  const story = state.current_story
  const lastItemInUserStory = story.parentNode.firstElementChild
  const firstItemInUserStory = story.parentNode.lastElementChild
  const hasNextUserStory = story.parentElement.nextElementSibling
  const hasPrevUserStory = story.parentElement.previousElementSibling
  
  if (direction === 'next') {
    if (lastItemInUserStory === story && !hasNextUserStory)
      return
    else if (lastItemInUserStory === story && hasNextUserStory) {
      state.current_story = story.parentElement.nextElementSibling.lastElementChild
      story.parentElement.nextElementSibling.scrollIntoView({
        behavior: 'smooth'
      })
    }
    else {
      story.classList.add('seen')
      state.current_story = story.previousElementSibling
    }
  }
  else if(direction === 'prev') {
    if (firstItemInUserStory === story && !hasPrevUserStory)
      return
    else if (firstItemInUserStory === story && hasPrevUserStory) {
      state.current_story = story.parentElement.previousElementSibling.firstElementChild
      story.parentElement.previousElementSibling.scrollIntoView({
        behavior: 'smooth'
      })
    }
    else {
      story.nextElementSibling.classList.remove('seen')
      state.current_story = story.nextElementSibling
    }
  }
}

stories.addEventListener('click', e => {
  if (e.target.nodeName !== 'ARTICLE') 
    return
  
  navigateStories(
    e.clientX > median 
      ? 'next' 
      : 'prev')
})

// left & right are free with snap points 👍
document.addEventListener('keydown', ({key}) => {
  if (key !== 'ArrowDown' || key !== 'ArrowUp')
    navigateStories(
      key === 'ArrowDown'
        ? 'next'
        : 'prev')
})