将 React ImageSlider 转换为 NextJS
P粉225961749
P粉225961749 2024-04-05 10:45:23
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我在 React 中有以下图像滑块,它按预期工作:

import React, { useState, useEffect } from "react";
import item1 from "./../assets/images/items/1.jpg";
import item2 from "./../assets/images/items/2.gif";

const imgs = [item1, item2]; // Array of images

const ImageSlider = () => {
  const [current, setCurrent] = useState(0); // Initialize state to display the first image

  // Change image every 2 seconds
  useEffect(() => {
    const interval = setInterval(() => {
      setCurrent((current) => (current + 1) % imgs.length); // Move to the next image, go back to the first image after the last
    }, 4000); // Change every 2 seconds

    return () => {
      clearInterval(interval); // Clean up on unmount
    };
  }, []);

  return (
    <div className="relative">
      <img
        src={imgs[0]}
        className="w-full h-auto opacity-0"
        alt="placeholder"
      />
      {imgs.map((img, index) => (
        <img
          key={index}
          src={img}
          alt={`slide-img-${index}`}
          className={`absolute top-0 transition-opacity duration-1000 ease-in-out ${
            current === index ? "opacity-100" : "opacity-0"
          } w-full h-auto`}
        />
      ))}
    </div>
  );
};

export default ImageSlider;

但它在 NextJS 中不起作用,我对其进行了一些修改以修复错误:

"use client";
import React, { useState, useEffect } from "react";

const imgs = ["/images/1.jpg", "/images/2.gif", "/images/3.jpg"];
const ImageSlider = () => {
  const [current, setCurrent] = useState(0); // Initialize state to display the first image

  // Change image every 2 seconds
  useEffect(() => {
    const interval = setInterval(() => {
      setCurrent((current) => (current + 1) % imgs.length); // Move to the next image, go back to the first image after the last
    }, 2000); // Change every 2 seconds

    return () => {
      clearInterval(interval); // Clean up on unmount
    };
  }, []);

  return (
    <div className="relative">
      <img
        src={imgs[0]}
        className="w-full h-auto opacity-0"
        alt="placeholder"
      />
      {imgs.map((img, index) => (
        <img
          key={index}
          src={img}
          alt={`slide-img-${index}`}
          className={`absolute top-0 transition-opacity duration-1000 ease-in-out ${
            current === index ? "opacity-100" : "opacity-0"
          } w-full h-auto`}
        />
      ))}
    </div>
  );
};

export default ImageSlider;

我尝试在组件顶部添加“使用客户端”并修改代码以修复 IDE 显示的错误,数组中的所有图像都显示在浏览器网络选项卡中。

P粉225961749
P粉225961749

全部回复(1)
P粉194541072

在 Next.js 中,您不能直接在顶级组件中使用 React hooks。相反,您可以在 Next.js 的 useEffect 函数中使用 useEffect 挂钩。以下是修改代码以使其在 Next.js 中运行的方法:

import { useState, useEffect } from "react";

const imgs = ["/images/1.jpg", "/images/2.gif", "/images/3.jpg"];
const ImageSlider = () => {
const [current, setCurrent] = useState(0);

useEffect(() => {
const interval = setInterval(() => {
  setCurrent((current) => (current + 1) % imgs.length);
}, 2000);

return () => {
  clearInterval(interval);
};
}, []); // Empty dependency array to run effect only once

return (
placeholder {imgs.map((img, index) => ( {`slide-img-${index}`} ))}
); }; export default ImageSlider;
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