How do I add React component on button click?

Question

I would like to have an Add input button that, when clicked, will add a new Input component. The following is the React.js code that I thought is one way of implementing the logic that I want, but unfortunately it's doesn't work.

The exception that I got is:

invariant.js:39 Uncaught Invariant Violation: Objects are not valid as a React child (found: object with keys {input}). If you meant to render a collection of children, use an array instead or wrap the object using createFragment(object) from the React add-ons. Check the render method of FieldMappingAddForm.

How do I solve this problem?

import React from 'react';
import ReactDOM from "react-dom";


class Input extends React.Component {
    render() {
        return (
            <input placeholder="Your input here" />
        );
    }
}


class Form extends React.Component {
    constructor(props) {
        super(props);
        this.state = {inputList: []};
        this.onAddBtnClick = this.onAddBtnClick.bind(this);
    }

    onAddBtnClick(event) {
        const inputList = this.state.inputList;
        this.setState({
            inputList: inputList.concat(<Input key={inputList.length} />)
        });
    }

    render() {
        return (
            <div>
                <button onClick={this.onAddBtnClick}>Add input</button>
                {this.state.inputList.map(function(input, index) {
                    return {input}   
                })}
            </div>
        );
    }
}


ReactDOM.render(
    <Form />,
    document.getElementById("form")
);

Jonathan · Accepted Answer · 2020-01-04 21:24:46Z

27

React Hook Version

Click here for live example

import React, { useState } from "react";
import ReactDOM from "react-dom";

const Input = () => {
  return <input placeholder="Your input here" />;
};

const Form = () => {
  const [inputList, setInputList] = useState([]);

  const onAddBtnClick = event => {
    setInputList(inputList.concat(<Input key={inputList.length} />));
  };

  return (
    <div>
      <button onClick={onAddBtnClick}>Add input</button>
      {inputList}
    </div>
  );
};

ReactDOM.render(<Form />, document.getElementById("form"));

answered Jan 4, 2020 at 21:24

Jonathan

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Comments

Oleksandr T. · Accepted Answer · 2016-03-31 18:21:33Z

13

Remove {}., it is not necessary using it in this case

{this.state.inputList.map(function(input, index) {
  return input;
})}

Example

or better in this case avoid .map and just use {this.state.inputList},

Example

edited Mar 31, 2016 at 18:21

answered Mar 31, 2016 at 14:36

Oleksandr T.

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Comments

Vipin rao · Accepted Answer · 2022-10-07 06:13:11Z

-1

const [visible,setVisible] = useState(false);
return(
    <>
    <button onClick={()=>setVisible(true)}>Hit me to add new div</button>
    {
      visible ? (
        <div id='addThisContainer'>
          {/* Your code inside */}
        </div>
       ) : null
    }
  </>
)

answered Oct 7, 2022 at 6:13

Vipin rao

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