Reacthoz 2.0

    const show_image = () => {
        let reader = new FileReader();

        // Closure to capture the file information.
        reader.onload = (function() {
        return function(e) {
            // Render thumbnail.
            image_canvas.current.src = e.target.result
            image_canvas.current.style.display = "block"
        };
        })(selected_file);

        // Read in the image file as a data URL.
        reader.readAsDataURL(selected_file);
    }