reactjs React.js图片库显示同一张图片

z9zf31ra  于 2023-01-30  发布在  React
关注(0)|答案(1)|浏览(162)

我有一个图库,在那里按下箭头下一个和上一个“按钮”的图像变化,而这工作时,我有一个图像在屏幕上,当我试图显示一个以上的图像不断重复。谁能建议一种方法来使它,使相同的图像不显示在所有三个标签时,点击下一个/上一个?

import React, { useState } from "react";

function GallerySection() {
  const slides = [
    { src: "./images/image1.jpg" },
    { src: "./images/image2.jpg" },
    { src: "./images/image3.jpg" },
    { src: "./images/image4.jpg" },
    { src: "./images/image5.jpg" },
  ];
  const [currentIndex, setCurrentIndex] = useState(0);
  console.log(slides[currentIndex].src);

  const prevSlide = () => {
    const isFirstSlide = currentIndex === 0;
    const newIndex = isFirstSlide ? slides.length - 1 : currentIndex - 1;
    setCurrentIndex(newIndex);
  };
  const nextSlide = () => {
    const isLastSlide = currentIndex === slides.length - 1;
    const newIndex = isLastSlide ? 0 : currentIndex + 1;
    setCurrentIndex(newIndex);
  };
  return (
    <div className="container px-6 pt-20">
      <div className="lg:ml-[12.5rem]">
        <p className="mb-8 text-3xl font-medium underline underline-offset-8 decoration-red-600">
          Gallery
        </p>
      </div>
      <div className="flex w-64 space-x-4 duration-500 bg-center bg-cover rounded-2xl">
        <img src={slides[currentIndex].src}></img>
        <img src={slides[currentIndex].src}></img>
        <img src={slides[currentIndex].src}></img>
      </div>
      <div>
        <img
          className="absolute w-12 cursor-pointer left-32"
          src="./images/arrow.svg"
          alt="Previous"
          onClick={prevSlide}
        />
      </div>
      <div>
        <img
          className="absolute w-12 rotate-180 cursor-pointer right-32"
          src="./images/arrow.svg"
          alt="Next"
          onClick={nextSlide}
        />
      </div>
    </div>
  );
}
export default GallerySection;
hyrbngr7

hyrbngr71#

你的逻辑可以大大简化,这样做你也会消除你的问题。关键是使用modular arithmetic,你可以使用modulo operator %。一旦你理解了什么是模,它只是简单的数学。
下面是一个工作示例:

function GallerySection() {
  const slides = [
    "https://dummyimage.com/300x50/000/fff",
    "https://dummyimage.com/300x50/cc29cc/fff",
    "https://dummyimage.com/300x50/1aff00/fff",
    "https://dummyimage.com/300x50/e33f22/fff",
  ];
  const [currentIndex, setCurrentIndex] = React.useState(0);
  const prevSlide = () => setCurrentIndex((slides.length + currentIndex - 1) % slides.length);
  const nextSlide = () => setCurrentIndex((currentIndex + 1) % slides.length);

  return (
    <div>
      <h1>Gallery</h1>
      <img src={slides[currentIndex]} />
      <div className="container">
        <button onClick={() => prevSlide()}>Previous slide</button>
        <button onClick={() => nextSlide()}>Next slide</button>
      </div>
    </div>
  );
}
ReactDOM.render(<GallerySection />, document.getElementById("root"));
.container {
  display: flex;
  flex-direction: row;
}
<script crossorigin src="https://unpkg.com/react@18/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.production.min.js"></script>
<div id="root"></div>

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