How to get image data from a file input in react.js

I want to get the data from an input file in react. I have created a class with the data as a state. The idea is that the data should be updated every time the input changes. As this happens, an image should load with the input data.

The code below is what I have created, but it does not work.

class ImagePicker extends React.Component {
    constructor(props){
        super(props);

        this.state = {
            data: null
        }
    }

    handleDataChange = e => {
        this.setState({
            data: e.target.value
        })
    }

    render(){
        return(
            <div>
                <input type='file' onChange={this.handleDataChange} />
                <img src={this.state.data}></img>
            </div>
        )
    }
}

I don’t know what the problem is, could you help?