从 React 应用程序内部访问 Bootstrap 方法

Question

我正在尝试在 React 应用程序内部使用 Bootstrap 的 .modal() 方法来显示模式。这就是我运行:

class Modal extends React.Component {
  constructor(props) {
    super(props);
    this.modal = React.createRef();
  }

  componentDidMount() {
    this.modal.modal()
  }

  render() {
    return (
      <div
        className="modal fade"
        ref={this.modal}
      >
        //some stuff
      </div>
    );
  }
}

export default Modal;

出于某种原因，React 无法访问 this.modal 中的 .modal()，尽管后者对象指向正确的 DOM 元素。关于如何运行该方法的任何想法？

Answer 1

您必须导入一些依赖项才能使用 .modal()。

来自docs

Many of our components require the use of JavaScript to function. Specifically, they require jQuery, Popper.js, and our own JavaScript plugins. Place the following s near the end of your pages, right before the closing tag, to enable them. jQuery must come first, then Popper.js, and then our JavaScript plugins.

在您的 index.html 上，在 body 的结束标记之前添加以下脚本。

<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js" integrity="sha384-B4gt1jrGC7Jh4AgTPSdUtOBvfO8shuf57BaghqFfPlYxofvL8/KUEfYiJOMMV+rV" crossorigin="anonymous"></script>

然后在您的 Modal 组件上，将 componentDidMount 更改为

componentDidMount() {
  window.$(this.modal.current).modal();
}

看来你是想在挂载组件时自动打开模态；使用 React Bootstrap you can easily achieve this by using the Modal 组件并将 true 作为 show prop.

...
import Modal from "react-bootstrap/Modal";

class MyModal extends React.Component {
  state = {
    show: true
  };

  render() {
    return <Modal show={this.state.show} />;
  }
}

Answer 2

如果您可以选择使用其他库，我建议 Reactstrap 因为它有一些不错的 HoC，可以让集成变得轻而易举。

import React, { useState } from 'react';
import { Button, Modal, ModalHeader, ModalBody, ModalFooter } from 'reactstrap';

const ModalExample = (props) => {
  const {
    buttonLabel,
    className
  } = props;

  const [modal, setModal] = useState(false);

  const toggle = () => setModal(!modal);

  return (
    <div>
      <Button color="danger" onClick={toggle}>{buttonLabel}</Button>
      <Modal isOpen={modal} toggle={toggle} className={className}>
        <ModalHeader toggle={toggle}>Modal title</ModalHeader>
        <ModalBody>
          Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
        </ModalBody>
        <ModalFooter>
          <Button color="primary" onClick={toggle}>Do Something</Button>{' '}
          <Button color="secondary" onClick={toggle}>Cancel</Button>
        </ModalFooter>
      </Modal>
    </div>
  );
}

export default ModalExample;

否则，请检查 Devtools and/or 您的日志以确保 Bootstrap and it's JS dependencies 正在正确加载。

从 React 应用程序内部访问 Bootstrap 方法

Accessing Bootstrap method from inside React app

javascript

bootstrap-modal

reactjs