how to add row to a table using ReactJS on button click

Question

I have a table and I want to add a row to it when ADD button is clicked. How can I do that using ReactJS instead of simple JavaScript?

code:

var RecordsComponent = React.createClass({
    render : function() {
        return (
            <div>
                <table>
                    <tr>
                        <td>row 1</td>
                    </tr>
                    <tr>
                        <td>row 2</td>
                    </tr>
                    <tr>
                        <td}>row 3</td>
                    </tr>
                </table>
                <button id="addBtn" onClick={addRow}>ADD</button>
            </div>
        );
    },
    addRow : function() {
        //how to add row using ReactJS?
    },
});

React.render(<RecordsComponent/>, document.getElementById('display'))

Have the data for the extra rows (or all rows, depending on what you are trying to do) saved in your state, then conditionally render the extra rows in your render function with something like this.state.rows.map(). — jlaitio
– jlaitio, Commented Sep 18, 2017 at 11:48

jlaitio · Accepted Answer · 2017-09-18 12:07:55Z

You need to make your React component have a state and render the component accordingly based on that data. Forget the old "DOM modification" paradigm where you are playing directly with HTML elements.

Untested but should carry the idea across:

var RecordsComponent = React.createClass({
    getInitialState: {
        return {
          rows: ['row 1', 'row 2', 'row 3']
        }
    },
    render : function() {
        return (
            <div>
                <table>
                    {rows.map((r) => (
                      <tr>
                          <td>{r}</td>
                      </tr>
                    ))}
                </table>
                <button id="addBtn" onClick={addRow}>ADD</button>
            </div>
        );
    },
    addRow : function() {
        var rows = this.state.rows
        rows.push('new row')
        this.setState({rows: rows})
    },
});

React.render(<RecordsComponent/>, document.getElementById('display'))

If you're just starting to learn React with your own test apps I would recommend using the most recent version of React, along with, among a lot of other things, the React ES6 class definitions.

TassosK · Accepted Answer · 2020-11-14 16:16:12Z

2

Try something like this

   var RecordsComponent = React.createClass({

      getInitialState: function () {
        return {
          tablerows:[
           {fname:"Tom",lname:"Moody",age:23}
          ]
        };
      },    
  addRow: function() {
      // add new data from here    
      var newdata = {fname:"Tom",lname:"Moody",age:23}    
      //take the existing state and concat the new data and set the state again    
    this.setState({ tablerows: this.state.tablerows.concat(newdata ) });    
  },    
  rows:function(){
      return this.state.tablerows.map(function(row,i){
            return   (<tr key={i}>
                     <td>{row.fname}</td>
                     <td>{row.lname}</td> 
                     <td>{row.age}</td>
                     </tr>);
      });
  },

        render : function() {
            return (
                <div>
                    <table>
                        <tr>
                            <td> row 1 </td>
                        </tr>
                        <tr>
                            <td> row 2 </td>
                        </tr>
                        <tr>
                            <td> row 3 </td>
                        </tr>
                        {this.rows()}
                    </table>
                    <button id= "addBtn" onClick={this.addRow}>ADD</button>
                </div>
            );
        }
    });
    
    React.render(<RecordsComponent/>, document.getElementById('display'))

edited Nov 14, 2020 at 16:16

TassosK

3033 silver badges19 bronze badges

answered Sep 18, 2017 at 12:10

TRomesh

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3 Comments

NightTom Over a year ago

How would you do this with a constructors state? I'm using spfx (TypeScript/Reactjs) and am struggling to convert either answers to fit my existing code.

TRomesh Over a year ago

@Tom convert the getInitialState() to

constructor(props){super(props); state= {           tablerows:[            {fname:"Tom",lname:"Moody",age:23}           ]         }}

NightTom Over a year ago

yes I can see how that sets an initial state with "Tom" and "Moody" etc in it, but how would you set fname: and lname: from a function? How would you reference it using this.setState({})?

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