ant-design/components/alert/index.tsx

import React from 'react';
import ReactDOM from 'react-dom';
import Animate from 'rc-animate';
import Icon from '../icon';
import classNames from 'classnames';

export default class Alert extends React.Component {
  static defaultProps = {
    prefixCls: 'ant-alert',
    showIcon: false,
    onClose() {},
    type: 'info',
  }
  constructor(props) {
    super(props);
    this.state = {
      closing: true,
      closed: false,
    };
  }
  handleClose = (e) => {
    e.preventDefault();
    let dom = ReactDOM.findDOMNode(this);
    dom.style.height = `${dom.offsetHeight}px`;
    // Magic code
    // 重复一次后才能正确设置 height
    dom.style.height = `${dom.offsetHeight}px`;

    this.setState({
      closing: false,
    });
    this.props.onClose(e);
  }
  animationEnd = () => {
    this.setState({
      closed: true,
      closing: true,
    });
  }
  render() {
    let {
      closable, description, type, prefixCls, message, closeText, showIcon,
    } = this.props;

    let iconType = '';
    switch (type) {
      case 'success':
        iconType = 'check-circle';
        break;
      case 'info':
        iconType = 'info-circle';
        break;
      case 'error':
        iconType = 'cross-circle';
        break;
      case 'warning':
        iconType = 'exclamation-circle';
        break;
      default:
        iconType = 'default';
    }

    // use outline icon in alert with description
    if (!!description) {
      iconType += '-o';
    }

    let alertCls = classNames({
      [prefixCls]: true,
      [`${prefixCls}-${type}`]: true,
      [`${prefixCls}-close`]: !this.state.closing,
      [`${prefixCls}-with-description`]: !!description,
      [`${prefixCls}-no-icon`]: !showIcon,
    });

    // closeable when closeText is assigned
    if (closeText) {
      closable = true;
    }

    return this.state.closed ? null : (
      <Animate component=""
        showProp="data-show"
        transitionName={`${prefixCls}-slide-up`}
        onEnd={this.animationEnd}
      >
        <div data-show={this.state.closing} className={alertCls}>
          {showIcon ? <Icon className="ant-alert-icon" type={iconType} /> : null}
          <span className={`${prefixCls}-message`}>{message}</span>
          <span className={`${prefixCls}-description`}>{description}</span>
          {closable ? <a onClick={this.handleClose} className={`${prefixCls}-close-icon`}>
            {closeText || <Icon type="cross" />}
          </a> : null}
        </div>
      </Animate>
    );
  }
}