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javascript - 如何在单击时显示/隐藏具有特定类的元素？

问题描述

我对 React 和 ES6 还很陌生，我正在尝试开发功能，以便在单击按钮 (.featureBtn) 时，隐藏许多具有特定类的元素（所有 .featureBtn 元素），而另一个组件（附件）变得可见。

这可以使用 state 和三元语句来完成吗？如果可以，怎么做？

请在下面查看我的代码。

class ProductView extends React.Component {

  static contextType = ChoicesContext;

  constructor(props) {
    super(props);

    this.forwardSequence = this.forwardSequence.bind(this);
    this.reverseSequence = this.reverseSequence.bind(this);
  }

  static sequenceImages(folder, filename, type) {
    let images = [];
    for (let i = 0; i < 51; i++) {
      images.push(<img src={require(`../images/sequences/${folder}/${filename}_000${i}.jpg`)} alt="" className={`${type} sequenceImage`} />);
    }
    return images;
  }

  async sleep(ms) {
    return new Promise(r => setTimeout(r, ms))
  }

  async forwardSequence(sequence, effect) {
    Array.prototype.reduce.call
      ( sequence
      , (r, img) => r.then(_ => this.sleep(50)).then(_ => effect(img))
      , Promise.resolve()
      )
  }

  async reverseSequence(sequence, effect) {
    Array.prototype.reduceRight.call
      ( sequence
      , (r, img) => r.then(_ => this.sleep(50)).then(_ => effect(img))
      , Promise.resolve()
      )
  }

  render() {
    const etseq = document.getElementsByClassName("exploreTech");
    const uiseq = document.getElementsByClassName("userInterface");

    const { choices } = this.context;
    const CurrentProduct = ProductData.filter(x => x.name === choices.productSelected);

    return (
      <>

        <div className="productInteractive wrapper">
          {CurrentProduct.map((item, i) => (
            <main className={item.slug}>

              <div key={i} className="imageSequence">
                <img src={require(`../images/sequences/${item.static_img}`)} alt="" className="staticImage" />
                {ProductView.sequenceImages(item.explore_tech_img_folder, item.explore_tech_filename, "exploreTech")}
                {ProductView.sequenceImages(item.user_interface_img_folder, item.user_interface_filename, "userInterface")}
              </div>

             {/* When one of the two buttons below are clicked, they should both hide (presumably using the featureBtn class), and the <Accessories /> component should become visible. */}

              <button
                onClick={() => this.forwardSequence(etseq, img => img.style.opacity = 1)}
                className="btn featureBtn userInterfaceBtn"
              >User Interface</button>

              <button
                onClick={() => this.forwardSequence(uiseq, img => img.style.opacity = 1)}
                className="btn-reverse featureBtn exploreTechnologiesBtn"
              >Explore Technologies</button>

           <Accessories />

            </main>
          ))}
        </div>
      </>
    );
  }
}
export default ProductView;

标签： javascriptreactjsecmascript-6

解决方案

因为它是反应，你不需要做classlike vanila js。您可以访问状态，因此可以根据您当前的状态调用它。

if(this.state.showFirst) {
  this.showFirst();
} else {
  this.showSecond();
}

所以这showFirst and showSecond可以返回适当的元素。

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