reactstrap/src/Alert.js

import React from 'react';
import PropTypes from 'prop-types';
import classNames from 'classnames';
import { mapToCssModules, tagPropType } from './utils';
import Fade from './Fade';

const propTypes = {
  children: PropTypes.node,
  className: PropTypes.string,
  closeClassName: PropTypes.string,
  closeAriaLabel: PropTypes.string,
  cssModule: PropTypes.object,
  color: PropTypes.string,
  fade: PropTypes.bool,
  isOpen: PropTypes.bool,
  toggle: PropTypes.func,
  tag: tagPropType,
  transition: PropTypes.shape(Fade.propTypes),
  innerRef: PropTypes.oneOfType([
    PropTypes.object,
    PropTypes.string,
    PropTypes.func,
  ]),
};

const defaultProps = {
  color: 'success',
  isOpen: true,
  tag: 'div',
  closeAriaLabel: 'Close',
  fade: true,
  transition: {
    ...Fade.defaultProps,
    unmountOnExit: true,
  },
};

function Alert(props) {
  const {
    className,
    closeClassName,
    closeAriaLabel,
    cssModule,
    tag: Tag,
    color,
    isOpen,
    toggle,
    children,
    transition,
    fade,
    innerRef,
    ...attributes
  } = props;

  const classes = mapToCssModules(classNames(
    className,
    'alert',
    `alert-${color}`,
    { 'alert-dismissible': toggle }
  ), cssModule);

  const closeClasses = mapToCssModules(classNames('close', closeClassName), cssModule);

  const alertTransition = {
    ...Fade.defaultProps,
    ...transition,
    baseClass: fade ? transition.baseClass : '',
    timeout: fade ? transition.timeout : 0,
  };

  return (
    <Fade {...attributes} {...alertTransition} tag={Tag} className={classes} in={isOpen} role="alert" innerRef={innerRef}>
      {toggle ?
        <button type="button" className={closeClasses} aria-label={closeAriaLabel} onClick={toggle}>
          <span aria-hidden="true">&times;</span>
        </button>
        : null}
      {children}
    </Fade>
  );
}

Alert.propTypes = propTypes;
Alert.defaultProps = defaultProps;

export default Alert;