weseek__growi/src/client/js/components/LikeButton.jsx

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

import { toastError } from '../util/apiNotification';
import { withUnstatedContainers } from './UnstatedUtils';
import AppContainer from '../services/AppContainer';
import PageContainer from '../services/PageContainer';

class LikeButton extends React.Component {

  constructor(props) {
    super(props);

    this.handleClick = this.handleClick.bind(this);
  }

  async handleClick() {
    const { pageContainer } = this.props;
    try {
      pageContainer.toggleLike();
    }
    catch (err) {
      toastError(err);
    }
  }

  isUserLoggedIn() {
    return this.props.appContainer.currentUserId != null;
  }

  render() {
    const { pageContainer } = this.props;
    // if guest user
    if (!this.isUserLoggedIn()) {
      return <div></div>;
    }

    return (
      <button
        type="button"
        onClick={this.handleClick}
        className={`btn btn-like border-0 d-edit-none
        ${pageContainer.state.isLiked ? 'active' : ''}`}
      >
        <i className="icon-like mr-3"></i>
        <span className="total-likes">
          {pageContainer.state.sumOfLikers}
        </span>
      </button>
    );
  }

}

/**
 * Wrapper component for using unstated
 */
const LikeButtonWrapper = withUnstatedContainers(LikeButton, [AppContainer, PageContainer]);

LikeButton.propTypes = {
  appContainer: PropTypes.instanceOf(AppContainer).isRequired,
  pageContainer: PropTypes.instanceOf(PageContainer).isRequired,

  size: PropTypes.string,
};

export default LikeButtonWrapper;