reactjs - 隐藏/显示 React-slick 箭头

Question

我正在使用react-slick，并且我有自己的自定义箭头。该 slider 不是无限循环，我想隐藏循环开始和结束处的箭头。所以基本上在开始时 PrevArrow 应该被隐藏，最后 NextArrow 应该被隐藏。我试图根据状态变化设置隐藏类名称。然而，尽管状态正在正确更改，但类名并未更改。你知道这段代码有什么问题吗？以及如何让它发挥作用？

下面是我对 Slider 和渲染 Slider 的组件的设置。

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import Slider from 'react-slick';
import Arrow from '../slider/Arrow';


export default class CityCarousel extends Component {
    constructor(props) {
        super(props);

        this.state = {
            displayLeftArrow: true,
            displayRightArrow: true
        };


        this.slidesToShow = 5;
        this.sliderSetting = {
            dots: false,
            arrows: true,
            infinite: false,
            initialSlide: 0,
            slidesToShow: this.slidesToShow,
            slidesToScroll: 1,
            speed: 500,
            rows: 0,
            nextArrow: <Arrow
                    styleClassName={`city-carousel__right ${
                        this.state.displayRightArrow ? '' : 'city-carousel__right--hide'
                    }`}
                    direction="right"
                    clickHandler={this.clickHandler}
                />,
            prevArrow: <Arrow
                    styleClassName={`city-carousel__left ${
                        this.state.displayLeftArrow ? '' : 'city-carousel__left--hide'
                    }`}
                    direction="left"
                    clickHandler={this.clickHandler}
                />,
            afterChange: currentSlide => this.setArrowDisplay(currentSlide)
        };
    }

    clickHandler = direction => {
        if (direction === 'left') {
            this.slider.slickPrev();
        } else if (direction === 'right') {
            this.slider.slickNext();
        }
    };

    setArrowDisplay = currentSlide => {
        const { cityList } = this.props;
        const displayLeftArrow = currentSlide !== 0;
        const displayRightArrow = currentSlide !== cityList.length - this.slidesToShow;

        this.setState({ displayRightArrow, displayLeftArrow });
    };

    render() {
        const { cityList, tours } = this.props;
        return (
            <div>
                <div className="city-selection">
                    <Slider
                        ref={c => this.slider = c }
                        {...this.sliderSetting}
                    >
                        {cityList.length > 0 ? this.renderCityList() : null}
                    </Slider>
                </div>
            </div>
        );
    }
}

这也是 Arrow 组件的代码

import React from 'react';
import PropTypes from 'prop-types';

const Arrow = ({ styleClassName, direction, clickHandler }) => {

    return(
    <div
        className={`slick-arrow--${direction} slider-arrow--${direction} ${styleClassName}`}
        onClick={e => clickHandler(direction)}
    />
)};

Arrow.propTypes = {
    styleClassName: PropTypes.string,
    direction: PropTypes.string,
    clickHandler: PropTypes.func
};

export default Arrow;

Answer 1

看来react-slick没有重新渲染<Arrow />使用新的 Prop ，并且始终使用第一个初始化的 Prop 设置。

我认为解决方案是获取 <Arrow />像这样的 slider :

    <div className="city-selection">
      <Arrow
        styleClassName={`city-carousel__right ${
          this.state.displayRightArrow ? '' : 'city-carousel__right--hide'
          }`}
        direction="right"
        clickHandler={this.clickHandler}
      />
      <Arrow
        styleClassName={`city-carousel__left ${
          this.state.displayLeftArrow ? '' : 'city-carousel__left--hide'
          }`}
        direction="left"
        clickHandler={this.clickHandler}
      />
      <Slider
        {/* list of items*/}
      </Slider>
    </div>

你可以在 here 中看到它是如何工作的