class Criterias extends React.Component {
	constructor(props) {
		super(props);
		this.state = {critList: {}, checkState: {}};
		this.checkboxOnChange = this.checkboxOnChange.bind(this);
	}
	componentDidMount() {
		axios.get('...')
  		.then((response) => {
			this.setState({critList : response.data})
  		})
  		.catch(function (error) {
  			console.log(error);
  		});
	}
	checkboxOnChange(){
		var key = event.target.id;

		var tmpObj = this.state.checkState;
		var newValue = !this.state.checkState[event.target.id];
		console.log(newValue);
		tmpObj[key] = newValue;
		console.log(tmpObj);
		this.setState({checkState : tmpObj});
		console.log(tmpObj);
	}

...

}