frontend/src/components/modals/Modal.js


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import classNames from "classnames";
import PropTypes from "prop-types";
import React from "react";
import jQuery from "../../util/jquery";

class Modal extends React.Component {
  static propTypes = {
    title: PropTypes.string.isRequired,
    show: PropTypes.bool.isRequired,
    onSubmit: PropTypes.func.isRequired,
    onCancel: PropTypes.func.isRequired,
    submitButtonType: PropTypes.string,
    submitButtonText: PropTypes.string
  };
  static defaultProps = {
    submitButtonType: "primary",
    submitButtonText: "Save"
  };
  static idCounter = 0;

  // Local, up-to-date copy of modal visibility for time between close event and a props update (to prevent duplicate
  // 'close' triggers)
  visible = false;

  constructor(props) {
    super(props);
    this.id = "modal-" + Modal.idCounter++;
  }

  componentDidMount() {
    this.visible = this.props.show;
    this.openOrCloseModal();

    // Trigger auto-focus
    jQuery("#" + this.id)
      .on("shown.bs.modal", function() {
        jQuery(this)
          .find("input")
          .first()
          .focus();
      })
      .on("hide.bs.modal", () => {
        if (this.visible) {
          this.props.onCancel();
        }
      })
      .on("keydown", e => {
        e.stopPropagation();
      });
  }

  componentDidUpdate() {
    this.visible = this.props.show;
    this.openOrCloseModal();
  }

  onSubmit() {
    if (this.visible) {
      this.props.onSubmit();
      this.visible = false;
      this.closeModal();
    }
  }

  onCancel() {
    if (this.visible) {
      this.props.onCancel();
      this.visible = false;
      this.closeModal();
    }
  }

  openModal() {
    jQuery("#" + this.id).modal("show");
  }

  closeModal() {
    jQuery("#" + this.id).modal("hide");
  }

  openOrCloseModal() {
    if (this.visible) {
      this.openModal();
    } else {
      this.closeModal();
    }
  }

  render() {
    return (
      <div className="modal fade" id={this.id} role="dialog">
        <div className="modal-dialog" role="document">
          <div className="modal-content">
            <div className="modal-header">
              <h5 className="modal-title">{this.props.title}</h5>
              <button
                type="button"
                className="close"
                onClick={this.onCancel.bind(this)}
                aria-label="Close"
              >
                <span>&times;</span>
              </button>
            </div>
            <div className="modal-body">{this.props.children}</div>
            <div className="modal-footer">
              <button
                type="button"
                className="btn btn-secondary"
                onClick={this.onCancel.bind(this)}
              >
                Close
              </button>
              <button
                type="button"
                className={classNames(
                  "btn",
                  "btn-" + this.props.submitButtonType
                )}
                onClick={this.onSubmit.bind(this)}
              >
                {this.props.submitButtonText}
              </button>
            </div>
          </div>
        </div>
      </div>
    );
  }
}

export default Modal;