React bind in constructor, how to pass parameters to props

You can't use this this.updateMood(value) = this.updateMood.bind(this,value); construction, because it is syntax error.

You can solve your problem like this

class CustomElement extends React.Component {  constructor() {    super();    this.update = this.update.bind(this);  }  update(e) {    this.props.updateMood(e.target.value);  }  render() {    return <input onChange={this.update} />  }}class Parent extends React.Component {  constructor() {    super();    this.state = {        mood: ""    };    this.updateMood = this.updateMood.bind(this);  }  updateMood(value) {    this.setState({ mood: value });  }  render() {    return <div>      <CustomElement updateMood={this.updateMood}></CustomElement>      <h1>{ this.state.mood }</h1>    </div>  }}

Example

Or, depending on your babel settings, or when using typescript, the following achieves the same but is a lot more convenient to write / maintain:

class Parent extends React.Component {  constructor() {    super();    this.state = {        mood: ""    };  }  updateMood = (value) => {    this.setState({ mood: value });  }}