如何在ReactJS中使用多个对话框和渲染模式

Question

我无法弄清楚如何使用“材质UI”对话框来渲染模态，在按钮点击时关闭它们，并使其点击不同的东西会带来不同的模态。

这是我从Material UI中获取的对话框组件

import React from 'react';
import Button from '@material-ui/core/Button';
import Dialog from '@material-ui/core/Dialog';
import DialogActions from '@material-ui/core/DialogActions';
import DialogContent from '@material-ui/core/DialogContent';
import DialogContentText from '@material-ui/core/DialogContentText';
import DialogTitle from '@material-ui/core/DialogTitle';


class DialogBox extends React.Component {

  render() {
    return (
      <Dialog
      open={this.props.open}
      onClose={this.props.handleClose}
      aria-labelledby="alert-dialog-title"
      aria-describedby="alert-dialog-description"
    >
      <DialogTitle id="alert-dialog-title">{"Use Google's location service?"}</DialogTitle>
      <DialogContent>
        <DialogContentText id="alert-dialog-description">
          Let Google help apps determine location. This means sending anonymous location data to
          Google, even when no apps are running.
        </DialogContentText>
      </DialogContent>
      <DialogActions>
        <Button onClick={this.props.handleClose} color="primary">
          Okay
        </Button>
      </DialogActions>
    </Dialog>
    );
  }
}


export default DialogBox;

这是我正在渲染对话框的页面，我在这里称之为Modal。如何制作它以便我可以在对话框打开时关闭它，这样我就可以点击不同的图片并打开一个包含不同文本的对话框？

import React,{Component} from "react";
import home from "./home.png";
import car from "./car.png";
import bed from "./bed.png";
import pet from "./pet.png";
import Dialog from "./Modal.js";

class Scenarios extends Component {
  constructor(){
    super();
    this.state = { open: false };
  }

  openModal = () =>{
    this.setState({ open: true });
  }

  handleClose = () => {
    this.setState({ open: false });
  };

  render() {
    return (
       <section className="App-scenarios">
        <h2> Quick Tips </h2>
        <p>Know What to Do in Different Scenarios during an Earthquake</p>
        <div className="scenario-group">

          <div className="scenario" onClick={this.openModal}>
            <img src={car}/>
          </div> 

          <div className="scenario" onClick={this.openModal}>
          <img src={home}/>
            <Dialog open={this.state.open} onClose={this.handleClose} title="Home" description="text" />
          </div>
          <div className="scenario" >
          <img src={bed}/>
          </div>
          

          <div className="scenario">
          <img src={pet}/>
          </div>
        </div>
      </section>
    );
    }
};

export default Scenarios;

Answer 1

你有一个很好的开始，但你错过了一些项目。您只需要使组件更加灵活和可重用（请参阅下面的注释）。

一些注意事项：下面的例子使用ES6 destructuring，ES6 Fat Arrow Functions，map function，spread operator和callback functions。此外，您无法将可点击元素（Modal）包装在另一个可点击元素（div）中。最外面的元素（div）只能由onClick事件处理程序处理。

工作示例（为简单起见，我不使用图像，而是使用可点击的占位符example.png标题）：

---

组件/莫代尔

import React from "react";
import PropTypes from "prop-types";
import {
  Button,
  Dialog,
  DialogActions,
  DialogContent,
  DialogContentText,
  DialogTitle
} from "@material-ui/core";


// "Modal is a pure function that requires 4 parameters in order to display 
// the "<Modal />" component. This function would be the same as a traditional function:
// 
//   function Modal({ deconstructed parameters }) { 
//     return (
//       <Dialog>
//        ...
//      </Dialog>
//     )
//   }

const Modal = ({ description, onCloseModal, openModal, title }) => ( 
  <Dialog
    open={openModal}
    onClose={onCloseModal}
    aria-labelledby="alert-dialog-title"
    aria-describedby="alert-dialog-description"
  >
    <DialogTitle id="alert-dialog-title">{title}</DialogTitle>
    <DialogContent>
      <DialogContentText id="alert-dialog-description">
        {description}
      </DialogContentText>
    </DialogContent>
    <DialogActions>
      <Button onClick={onCloseModal} color="primary">
        Okay
      </Button>
    </DialogActions>
  </Dialog>
);

// PropTypes throws a warning if any of the 4 required params are
// missing! In addition, it ensures that props are consistent in name
// and declaration from parent component to child component.

Modal.propTypes = {
  description: PropTypes.string.isRequired,
  onCloseModal: PropTypes.func.isRequired,
  openModal: PropTypes.bool.isRequired,
  title: PropTypes.string.isRequired
};

export default Modal;

组件/方案

import React, { PureComponent } from "react";
import PropTypes from "prop-types";


// Scenario will be a PureComponent (stateless, but still a class component) 
// that will open the Modal component with a supplied "description" and 
// "title" via a parent callback function named "handleOpenModal"

class Scenario extends PureComponent {
  openModal = () => {
    const { description, handleOpenModal, title } = this.props;
    handleOpenModal({ description, title });
  };

  render = () => (
    <div className="scenario" onClick={this.openModal}>
      <h1>{this.props.imgSrc}</h1>
    </div>
  );
}

Scenario.propTypes = {
  description: PropTypes.string.isRequired,
  handleOpenModal: PropTypes.func.isRequired,
  imgSrc: PropTypes.string.isRequired,
  title: PropTypes.string.isRequired
};

export default Scenario;

组件/场景

import React, { Component } from "react";
import Modal from "../Modal";
import Scenario from "../Scenario/";

// A scenarios variable of an array of objects -- makes it so we don't have to 
// repeat <Scenario title=".." description="..."imgSrc={...} handleOpenModal={..} /> 
// over and over, instead we map over these objects as "props" and spread
// them out inside of "Scenario" like so: <Scenario {...props} />, which 
// would be the same as:  
// <Scenario title={title} description={description} imgSrc={imgSrc} />

const scenarios = [
  {
    title: "Car",
    description: "This is a description for a car.",
    imgSrc: "car.png"
  },
  {
    title: "Home",
    description: "This is a description for a home.",
    imgSrc: "home.png"
  },
  {
    title: "Bed",
    description: "This is a description for a bed.",
    imgSrc: "bed.png"
  },
  {
    title: "Pet",
    description: "This is a description for a pet.",
    imgSrc: "pet.png"
  }
];

// Scenarios is a stateful class component that'll act as the parent 
// for its "Scenario" children. The children will update the parent via 
// "this.handleOpenModal". Meanwhile, "Modal" will sit inside the parent
// waiting for the parent state updates to affect how its rendered. The 
// Modal will close itself via the parent's "this.handleCloseModal"
// class method when the "Okay" button is clicked.

class Scenarios extends Component {
  state = { description: "", openModal: false, title: "" };

  handleOpenModal = ({ description, title }) => {
    this.setState({ description, openModal: true, title });
  };

  handleCloseModal = () => {
    this.setState({ openModal: false });
  };

  render = () => (
    <section className="App-scenarios">
      <h2> Quick Tips </h2>
      <p>Know What to Do in Different Scenarios during an Earthquake</p>
      <div className="scenario-group">
        {scenarios.map(props => (
          <Scenario
            {...props}
            key={props.title} // this is required for React to know that each "Scenario" that is returned by the "map" function is unique and must be handled as individual components (otherwise React will complain and throw a warning)
            handleOpenModal={this.handleOpenModal}
          />
        ))}
      </div>
      <Modal {...this.state} onCloseModal={this.handleCloseModal} />
    </section>
  );
}

export default Scenarios;