javascript - 如何使用 Contentful 在 Gatsby 中包含轮播组件？

Question

我想在我的 Gatsby 项目中包含一个图像轮播。所有图片都将从 Contentful 查询。

我使用了“react-responsive-carousel”，并设法让它与直接导入图像一起工作。我也确信我可以成功地提取内容丰富的图像，而无需将其放入轮播组件中。

谁能帮我解决这个问题？似乎 gatsby-image 组件 Img 没有返回“react-reponsive-carousel”可以识别的标签。或者你知道任何其他可以工作的轮播吗？

我的代码:

import React, { Component, Fragment } from "react"

import "react-responsive-carousel/lib/styles/carousel.min.css"
import { Carousel } from "react-responsive-carousel"
import { graphql } from "gatsby"
import Img from "gatsby-image"

import tourimg from "../images/tour-1.jpg"  //Import an image directly

export default class ApartmentPage extends Component {
  render() {
    const photos = this.props.data.allContentfulRooms.edges[0].node.photos
    return (
      <Carousel>
        {photos.map(photo => {
          const { fixed } = photo
          return (
            <div>
              <Img fixed={fixed} />
              {/* <img src={tourimg} /> */}
            </div>
          )
        })}
      </Carousel>
    )
  }
}

export const ROOM_QUERY = graphql`
  {
    allContentfulRooms {
      edges {
        node {
          id
          name
          photos {
            fixed(width: 150, height: 150) {
              ...GatsbyContentfulFixed_tracedSVG
            }
          }
        }
      }
    }
  }
`

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>

错误信息:

TypeError: Cannot read property 'map' of null
Thumbs.renderItems
node_modules/react-responsive-carousel/lib/components/Thumbs.js:174
  171 | value: function renderItems() {
  172 |     var _this2 = this;
  173 | 
> 174 |     return this.state.images.map(function (img, index) {
  175 |         var itemClass = _cssClasses2.default.ITEM(false, index === _this2.state.selectedItem && _this2.state.hasMount);
  176 | 
  177 |         var thumbProps = {

Answer 1

您看到的错误来自 react-responsive-carousel 的缩略图组件.虽然该组件可以满足子 div 中的任何内容，但是，要使缩略图起作用，它需要一个 img 标签。由于使用 gatsby，您必须使用 <Img>组件，您可以通过禁用缩略图来解决此问题

<Carousel showThumbs={false} />

以下是一个完整的工作示例(使用 Typescript):

import * as React from "react";
import Img from "gatsby-image";
import { graphql, StaticQuery } from "gatsby";

import "react-responsive-carousel/lib/styles/carousel.min.css";
import { Carousel } from "react-responsive-carousel";


interface childImageSharpNode {
  childImageSharp: {
    fluid: any;
  };
}
interface SlideShowComponentProps {
  nodes: childImageSharpNode[];
}

class SlideShowComponent extends React.Component<SlideShowComponentProps> {
  constructor(props: SlideShowComponentProps) {
    super(props);
  }

  render() {
    const images: any[] = [];
    for (const node of this.props.nodes) {
      images.push(
        <div>
          <Img fluid={node.childImageSharp.fluid} alt="Image"></Img>
        </div>,
      );
    }

    return (
      <Carousel showThumbs={false} infiniteLoop={true} autoPlay={true}>
        {images}
      </Carousel>
    );
  }
}

interface StaticQueryProps {
  allFile: {
    nodes: childImageSharpNode[];
  };
}

const SlideShow: React.FC = () => (
  <StaticQuery
    query={graphql`
      query slideshow {
        allFile(filter: { relativePath: { regex: "/slideshow/" } }) {
          nodes {
            childImageSharp {
              fluid(maxWidth: 1024) {
                ...GatsbyImageSharpFluid
              }
            }
          }
        }
      }
    `}
    render={(data: StaticQueryProps) => <SlideShowComponent nodes={data.allFile.nodes}></SlideShowComponent>}
  />
);

export default SlideShow;