nestedStateUpdateFormField.md

React component form field update of nested state for any text field in form

this.state={
user:{
  name: '',
  age: '',
  
}
}
 onTextBoxChange = e => {
    this.setState({
      user: {
        ...this.state.user,
        [e.target.name]: e.target.value
      }
    });
  };