[JavaScript] A simple small case on how to implement a carousel chart (complete code attached)

First show the actual effect:

The old rule, go directly to the code:

<!DOCTYPE html>
<html>

<head>
  <style>
    /* CSS样式代码 */

    .slider-container {
      position: relative;
      width: 600px;
      /* 设置轮播图容器宽度 */
      height: 400px;
      /* 设置轮播图容器高度 */
      overflow: hidden;
      /* 隐藏超出容器的部分 */
      margin: 0 auto;
    }

    .slider {
      display: flex;
      transition: transform 0.3s ease-in-out;
      /* 添加过渡效果 */
    }

    .slider-item {
      flex-shrink: 0;
      width: 100%;
      /* 设置每张图片的宽度 */
      height: 100%;
      /* 设置每张图片的高度 */
    }

    .slider-item img {
      width: 100%;
      /* 设置每张图片的宽度 */
      height: 100%;
      /* 设置每张图片的高度 */
    }

    .slider-controls {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      z-index: 1;
      /* 将导航按钮置于轮播图上方 */
    }

    .slider-controls button {
      background-color: #333;
      color: #fff;
      border: none;
      padding: 5px 10px;
      margin: 0 5px;
      cursor: pointer;
    }

    .slider-controls .prev-btn::before,
    .slider-controls .next-btn::after {
      content: "";
      display: inline-block;
      width: 10px;
      height: 10px;
      border-top: 2px solid #fff;
      border-right: 2px solid #fff;
      transform: rotate(45deg);
      margin-right: 5px;
    }

    .slider-controls .prev-btn::before {
      transform: rotate(-135deg);
      margin-right: 0;
      margin-left: 5px;
    }
  </style>
</head>

<body>
  <div class="slider-container">
    <div class="slider">
      <div class="slider-item">
        <img src="./img/1.jpg" alt="Image 1">
      </div>
      <div class="slider-item">
        <img src="./img/2.jpg" alt="Image 2">
      </div>
      <div class="slider-item">
        <img src="./img/3.jpg" alt="Image 3">
      </div>
      <div class="slider-item">
        <img src="./img/4.jpg" alt="Image 4">
      </div>
    </div>
    <div class="slider-controls">
      <button class="prev-btn"></button>
      <button class="next-btn"></button>
    </div>
  </div>

  <script>
    const sliderContainer = document.querySelector('.slider-container');
    const slider = document.querySelector('.slider');
    const prevBtn = document.querySelector('.prev-btn');
    const nextBtn = document.querySelector('.next-btn');

    const slideWidth = document.querySelector('.slider-item').offsetWidth;
    let currentPosition = 0;
    let isPaused = false;

    // 自动轮播
    const autoPlay = () => {
      if (!isPaused) {
        currentPosition -= slideWidth;
        if (currentPosition <= -(slideWidth * (slider.children.length - 1))) {
          currentPosition = 0;
        }
        slider.style.transform = `translateX(${currentPosition}px)`;
      }
      setTimeout(autoPlay, 2000);
    };

    // 鼠标悬停/离开事件监听器
    sliderContainer.addEventListener('mouseenter', () => {
      isPaused = true;
    });

    sliderContainer.addEventListener('mouseleave', () => {
      isPaused = false;
    });

    // 上一页按钮点击事件监听器
    prevBtn.addEventListener('click', () => {
      currentPosition += slideWidth;
      if (currentPosition > 0) {
        currentPosition = -(slideWidth * (slider.children.length-1));
      }
      slider.style.transform = `translateX(${currentPosition}px)`;
    });

    // 下一页按钮点击事件监听器
    nextBtn.addEventListener('click', () => {
      currentPosition -= slideWidth;
      if (currentPosition <= -(slideWidth * (slider.children.length))) {
        currentPosition = 0;
      }
      slider.style.transform = `translateX(${currentPosition}px)`;
    });

    // 启动自动轮播
    autoPlay();
  </script>
</body>

</html>

This code implements a simple carousel function. The specific functions are as follows:

1. Automatic carousel function: Use the `autoPlay()` function to achieve the effect of automatically switching pictures. The function first checks the value of the `isPaused` variable. If it is `false`, which means there is no pause, then `currentPosition` is subtracted by the width of the image. Then check whether the last picture has been reached, and if so, reset `currentPosition` to 0 to achieve a loop playback effect. Finally, by setting the `transform` attribute of the carousel image container, use the `translateX()` function to achieve the translation animation effect of the image. Then use the `setTimeout()` method to call the `autoPlay()` function in a timed loop to implement the automatic playback function.

    // 自动轮播
    const autoPlay = () => {
      if (!isPaused) {
        currentPosition -= slideWidth;
        if (currentPosition <= -(slideWidth * (slider.children.length - 1))) {
          currentPosition = 0;
        }
        slider.style.transform = `translateX(${currentPosition}px)`;
      }
      setTimeout(autoPlay, 2000);
    };

2.. Mouseover/leave event function: By using the `addEventListener()` method, `mouseenter` and `mouseleave` event listeners are added to the carousel container. When the mouse enters the container, set the `isPaused` variable to `true`, which means pausing the automatic carousel. When the mouse leaves the container, set the `isPaused` variable to `false` to resume automatic carousel.

    // 鼠标悬停/离开事件监听器
    sliderContainer.addEventListener('mouseenter', () => {
      isPaused = true;
    });

    sliderContainer.addEventListener('mouseleave', () => {
      isPaused = false;
    });

3. Previous page button click event function: By using the `addEventListener()` method, a `click` event listener is added to the previous page button. When the button is clicked, increase `currentPosition` by the width of the image. Then check whether the first picture has been reached. If so, set `currentPosition` to the position of the last picture to achieve a loop switching effect. Finally, by setting the `transform` attribute of the carousel image container, use the `translateX()` function to achieve the translation animation effect of the image.

    // 上一页按钮点击事件监听器
    prevBtn.addEventListener('click', () => {
      currentPosition += slideWidth;
      if (currentPosition > 0) {
        currentPosition = -(slideWidth * (slider.children.length-1));
      }
      slider.style.transform = `translateX(${currentPosition}px)`;
    });

4. Next page button click event function: By using the `addEventListener()` method, a `click` event listener is added to the next page button. When the button is clicked, `currentPosition` is subtracted by the width of the image. Then check whether the last picture has been reached, and if so, reset `currentPosition` to 0 to achieve a loop switching effect. Finally, by setting the `transform` attribute of the carousel image container, use the `translateX()` function to achieve the translation animation effect of the image.

    // 下一页按钮点击事件监听器
    nextBtn.addEventListener('click', () => {
      currentPosition -= slideWidth;
      if (currentPosition <= -(slideWidth * (slider.children.length))) {
        currentPosition = 0;
      }
      slider.style.transform = `translateX(${currentPosition}px)`;
    });

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[JavaScript] A simple small case on how to implement a carousel chart (complete code attached)

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