React.js - 创建简单表

Question

很抱歉看起来是一个新手问题(一直工作到很晚,刚开始使用React)但是我想弄清楚如何只渲染一个n x n维的简单表.

例如,在我的组件中,渲染输出将是这样的:

      <table id="simple-board">
        <tbody>
          <tr id="row0">
            <td id="cell0-0"></td>
            <td id="cell0-1"></td>
            <td id="cell0-2"></td>
          </tr>
          <tr id="row1">
            <td id="cell1-0"></td>
            <td id="cell1-1"></td>
            <td id="cell1-2"></td>
          </tr>
          <tr id="row2">
            <td id="cell2-0"></td>
            <td id="cell2-1"></td>
            <td id="cell2-2"></td>
          </tr>
        </tbody>
      </table>

其中每一行都有自己的id,以及每个单元格.

初始状态

  constructor(props){
    super(props);
    this.state = {size: 3}
  }

是什么设置表的大小.

让我失望的是如何在JSX中实现for循环.

Answer 1

经过一夜安眠,我能够弄清楚:

import React, { Component } from 'react'

export default class Example extends Component {
  constructor(props){
    super(props);
    this.state = {size: 3}
  }
  render(){
    let rows = [];
    for (var i = 0; i < this.state.size; i++){
      let rowID = `row${i}`
      let cell = []
      for (var idx = 0; idx < this.state.size; idx++){
        let cellID = `cell${i}-${idx}`
        cell.push(<td key={cellID} id={cellID}></td>)
      }
      rows.push(<tr key={i} id={rowID}>{cell}</tr>)
    }
    return(
      <div className="container">
        <div className="row">
          <div className="col s12 board">
            <table id="simple-board">
               <tbody>
                 {rows}
               </tbody>
             </table>
          </div>
        </div>
      </div>
    )
  }
}

谢谢大家回复!

Answer 2

一种选择（将东西移出render()：

import React from 'react';
import SimpleListMenu from '../menu/SimpleMenuListMenu'; // < Material UI element

let rows = [
  'Setting One',
  'Setting Two',
  'Setting Three',
  'Setting Four',
];

export default class MyTable extends React.Component {

  createTable = () => {

    let table = []
    for (let i = 0; i < rows.length; i++) {
      let children = []
      children.push(<td>{rows[i]}</td>, <td>{<SimpleListMenu />}</td>)
      table.push(<tr>{children}</tr>)
    }
    return table

  }

  render() {
    return(
      <table>
        {this.createTable()}
      </table>
    )
  }

}

另外一个选项：

import React from 'react';

let id = 0;
function createData(option, type) {
  id += 1;
  return { id, option, type };
}

let rows = [
  createData('Setting One', 'Private'),
  createData('Setting Two', 'Public'),
  createData('Setting Three', 'Group'),
  createData('Setting Four', 'Private'),
];

export default class MyTable extends React.Component {


  render() {
    return(
      <table>
      {rows.map(row => (
        <tr key={row.id}>
          <td>{row.option}</td>
          <td>{row.type}</td>
        </tr>
      ))}
      </table>
    )
  }

}

请参阅：https : //material-ui.com/demos/tables/

Answer 3

像这样的东西：

  <table id="simple-board">
    <tbody>
     {this.props.yourData.slice(0,this.state.size).map((item , index)=>{

        return(
      <tr key={index} id={`row${index}`}>
         {item.felanBisar.map((item2,index2)=>{
          return(
             <td id={`cell${index}-{index2}`}></td>
           );
          })}
      </tr>
       );
      })}
    </tbody>
  </table>