vnext/src/components/UploadButton.js


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import React from 'react';
import PropTypes from 'prop-types';

import Icon from './Icon';

export default class UploadButton extends React.Component {
    constructor(props) {
        super(props);
    }
    openfile = () => {
        const input = this.props.inputRef.current;
        if (this.props.value) {
            this.props.onChange('');
        } else {
            input.click();
        }
    }
    attachmentChanged = (event) => {
        this.props.onChange(event.target.value);
    }
    render() {
        return (
            <div style={this.props.value ? activeStyle : inactiveStyle}
                onClick={this.openfile}>
                <Icon name="ei-camera" size="s" />
                <input type="file" accept="image/jpeg,image/png" onClick={e => e.stopPropagation()}
                    style={{ display: 'none' }} ref={this.props.inputRef} value={this.props.value}
                    onChange={this.attachmentChanged} />
            </div>
        );
    }
}

UploadButton.propTypes = {
    value: PropTypes.string.isRequired,
    onChange: PropTypes.func.isRequired,
    inputRef: PropTypes.shape({ current: PropTypes.instanceOf(Element) })
};

const inactiveStyle = {
    cursor: 'pointer',
    color: '#888'
};
const activeStyle = {
    cursor: 'pointer',
    color: 'green'
};