Reactjs中的图像模态，使用Javacript进行幻灯片演示

Question

我正在尝试在React应用中使用此图片灯箱：

https://www.w3schools.com/howto/howto_js_lightbox.asp

图像模式对我来说很好。但是，当我尝试实现滑块时，它似乎不起作用。我正在从后端获取图像数据。

这是我获取所有图像数据的方式：

{
    "results": [{
        "data": [{
            "id": "f06f2cdf-1bb8-4388-a655-4e916a2703ce",
            "visitLocation": "dining room",
            "visitRequirementList": [{
                "imageName": "dining pic 1",
                "imagePath": "visitImageDirectory/0297b1ef-644b-45fc-9760-4e5693f54ac0.png",
            }, {
                "imageName": "dining pic 2",
                "imagePath": "visitImageDirectory/1b4915c1-733a-4bdb-a8d7-59ce3a095d44.png",
            }]
        }, {
            "id": "ce059d7a-d3d4-462c-a90f-62be13f24a29",
            "visitLocation": "bedroom",
            "visitRequirementList": [{
                "imageName": "bedroom pic 1",
                "imagePath": "visitImageDirectory/64960b86-f9bf-4de9-816f-f27487245c53.png",
            }]
        }]
    }],
    "message": "data Found",
    "status": "success"
}

这是我的render显示图像的方法：

import React, { Component } from 'react';

export default class extends Component {
    state = {
        showModal: false,
        caption: '',
        modalSrc: '',
        ioImageListing: [],

        // ...rest of the state
    };
    componentDidMount() {
        this.getAllProjectRequirementImageList();
    }
    getAllProjectRequirementImageList = () => {
        axios.get(this.state.apiUrl+'/api/v1/visitRequirement/getAllByProjectId', {
            params: {   projectId: this.state.projectId }
        }).then((response) => {
            console.log("get with list ImageData",response.data.data);
            this.setState({ ioImageListing: response.data.data  });
        }).catch((error)=>{  console.log("error",error); this.setState({ ioImageListing: []  });   });
    }



    render() {
        return (
            <div>
                <div style={{}}>
                    {this.state.ioImageListing.map((io, key) =>
                        <Grid container spacing={24}>
                            {io.visitRequirementList.map((pic, key) => [
                                <Grid style={{position: 'relative'}} item xs={3} key={key}>
                                <span key={key}>
                                    <img
                                        src={this.state.apiUrl + '/api/v1/visitImageRequirementInfo/getImageByImagePathId?imagePath=' + pic.imagePath}
                                        onClick={() => {
                                            this.setState({
                                                showModal: true,
                                                caption: `${pic.imageName}`,
                                                slideIndex: `${io.visitRequirementList.length}`,
                                                modalSrc: `${this.state.apiUrl}/api/v1/visitImageRequirementInfo/getImageByImagePathId?imagePath=${pic.imagePath}`,
                                                count: `${key}`
                                            });
                                        }}
                                    />
                                </span>
                                </Grid>
                            ])}
                        </Grid>
                    )}
                </div>
                <div id="myModal" className="modal" style={{display: this.state.showModal ? 'block' : 'none'}}>
                    <div>
                        <span className="close" onClick={() => this.setState({showModal: false})}>&times;</span>
                        <div className="mySlides"><img className="modal-content" id="img01" src={this.state.modalSrc}/>
                        </div>
                        <a className="prev" onClick={() => {
                            this.plusSlides(-1)
                        }}>&#10094;</a>
                        <a className="next" onClick={() => {
                            this.plusSlides(1)
                        }}>&#10095;</a>
                    </div>
                </div>
            </div>
        );
    }
}

这是我编写的用于显示滑块的功能：

    plusSlides = (n) => {
        var slideIndex=parseFloat(this.state.count);
        slideIndex=slideIndex+n
        this.setState({ count: slideIndex  });

        this.showSlides(slideIndex, n);
    }

  showSlides(slideIndex,n) {
        var i;
        var slides = document.getElementsByClassName("mySlides");
        if (n > slides.length) {slideIndex = 1}
        if (n < 1) {slideIndex = slides.length}
        for (i = 1; i < slides.length; i++) {
            slides[i].style.display = "none";
        }
        slides[slideIndex-1].style.display = "block";
    }

当图像模式打开时，我想将其变成幻灯片，只需单击我的下一个和上一个按钮即可。对此的任何帮助将不胜感激。

Answer 1

将“ mySlides”内部的img更改为：

// Create this in render method
const imageUrl = `${this.state.apiUrl}/api/v1/visitImageRequirementInfo/getImageByImagePathId?imagePath=`

/** -- snip -- **/

<img 
    className="modal-content" 
    id="img01" 
    src={`${imageUrl}${this.state.count}`}
/>