ReactJS: Warning: setState(…): Cannot update during an existing state transition

Question

ReactJS: Warning: setState(…): Cannot update during an existing state transition

I am trying to refactor the following code from my render view:

<Button href="#" active={!this.state.singleJourney} onClick={this.handleButtonChange.bind(this,false)} >Retour</Button>

to a version where the bind is within the constructor. The reason for that is that bind in the render view will give me performance issues, especially on low end mobile phones.

I have created the following code, but I am constantly getting the following errors (lots of them). It looks like the app gets in a loop:

Warning: setState(...): Cannot update during an existing state transition (such as within `render` or another component's constructor). Render methods should be a pure function of props and state; constructor side-effects are an anti-pattern, but can be moved to `componentWillMount`.

Below is the code I use:

var React = require('react');

var ButtonGroup = require('react-bootstrap/lib/ButtonGroup');

var Button = require('react-bootstrap/lib/Button');

var Form = require('react-bootstrap/lib/Form');

var FormGroup = require('react-bootstrap/lib/FormGroup');

var Well = require('react-bootstrap/lib/Well');



export default class Search extends React.Component {



    constructor() {

        super();



        this.state = {

            singleJourney: false

        };



        this.handleButtonChange = this.handleButtonChange.bind(this);

    }



    handleButtonChange(value) {

        this.setState({

            singleJourney: value

        });

    }



    render() {



        return (

            <Form>



                <Well style={wellStyle}>



                    <FormGroup className="text-center">



                        <ButtonGroup>

                            <Button href="#" active={!this.state.singleJourney} onClick={this.handleButtonChange(false)} >Retour</Button>

                            <Button href="#" active={this.state.singleJourney} onClick={this.handleButtonChange(true)} >Single Journey</Button>

                        </ButtonGroup>

                    </FormGroup>



                </Well>



            </Form>

        );

    }

}



module.exports = Search;

setstate constructor reactjs

3 years ago by Bharatgxwzm

2 Answers

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**espadacoder11** · Answer 1 · 2021-08-03T12:16:59

Looks like you're accidentally calling the handleButtonChange method in your render method, you probably want to do onClick={() => this.handleButtonChange(false)} instead.

If you don't want to create a lambda in the onClick handler, I think you'll need to have two bound methods, one for each parameter.

In the constructor:



this.handleButtonChangeRetour = this.handleButtonChange.bind(this, true);

this.handleButtonChangeSingle = this.handleButtonChange.bind(this, false);

And in the render method:



<Button href="#" active={!this.state.singleJourney} onClick={this.handleButtonChangeSingle} >Retour</Button>

<Button href="#" active={this.state.singleJourney} onClick={this.handleButtonChangeRetour}>Single Journey</Button>

**sandhya6gczb** · Answer 2 · 2021-08-04T13:15:49

If you are trying to add arguments to a handler in recompose, make sure that you're defining your arguments correctly in the handler. It is essentially a curried function, so you want to be sure to require the correct number of arguments. This page has a good example of using arguments with handlers.

Example (from the link):



withHandlers({

  handleClick: props => (value1, value2) => event => {

    console.log(event)

    alert(value1 + ' was clicked!')

    props.doSomething(value2)

  },

})

for your child HOC and in the parent



class MyComponent extends Component {

  static propTypes = {

    handleClick: PropTypes.func, 

  }

  render () {

    const {handleClick} = this.props

    return (

      <div onClick={handleClick(value1, value2)} />

    )

  }

}

this avoids writing an anonymous function out of your handler to patch fix the problem with not

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ReactJS: Warning: setState(…): Cannot update during an existing state transition

2 Answers

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