How to create a Table from lists using ReactJS?

Question

My objective is to create the following html table from a list of rows ([1, 2, 3]) and a list of columns ([1, 2]) using ReactJS:

<table>
<tr>
 <td>1</td>
 <td>2</td>
 </tr>
 <tr>
  <td>1</td>
 <td>2</td>
 </tr>
  <tr>
   <td>1</td>
   <td>2</td>
  </tr>
</table>

See below for my React script and here for my codepen, which doesnt seem to be working

 class Tbody extends React.Component {
      constructor(props) {
        super(props);
        this.state = {
          columns: [1, 2],
          rows: [1, 2, 3]
        };
      }

      renderCols() {
        return (
          {this.state.columns.map(col => <td key={col}> {col} </td>)}
        );
      }

      renderRows(){
       return (
         {this.state.rows.map(row => <tr key={row}> {this.renderCols()} </tr>)}
        );
      }

      render() {
        return <tbody>{this.renderRows()}</tbody>;
      }
    }

    class Table extends React.Component {
      render() {
        return (
          <div>
            <table>
            <Tbody />
             </table>
          </div>
        );
      }
    }

    ReactDOM.render(<Table />, document.getElementById("root"));

Arup Rakshit · Accepted Answer · 2018-12-24 20:21:50Z

3

Your renderCols and renderRows method returning the JSX. Instead return from there just plain JS objects, remove those {..}.

class Tbody extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      cols: [1, 2],
      rows: [1, 2, 3]
    };
  }

  renderCols() {
    
    return (
      this.state.cols.map(col => <td key={col}>{col}</td>)
    );
  };

  renderRows(){
   return (
     this.state.rows.map(row => <tr key={row}>{this.renderCols()}</tr>)
    );
  }
  
  render() {
    return <tbody>{this.renderRows()}</tbody>;
  }
}

class Table extends React.Component {
  render() {
    return (
      <div>
        <table>
        <Tbody />
         </table>
      </div>
    );
  }
}

ReactDOM.render(<Table />, document.getElementById("root"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>

<div id="root"></div>

edited Dec 24, 2018 at 20:21

answered Dec 24, 2018 at 20:01

Arup Rakshit

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2 Comments

Chris Over a year ago

This works but this codepen console with your update(codepen.io/chriscruz/pen/aPwbNP?editors=1011) is giving me a warning in the console: Warning: validateDOMNesting(...): %s cannot appear as a child of <%s>.%s%s%s" "Whitespace text nodes" "tr" " Make sure you don't have any extra whitespace between tags on each line of your source code." "" "

Arup Rakshit Over a year ago

@Chris Remove spaces between <tr></tr> which you have. Like <tr key={row}> {this.renderCols()} </tr> should be <tr key={row}>{this.renderCols()}</tr>.. Same goes for <td>. React warns those.

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