ant-design/components/transfer/search.jsx

import React, { PropTypes } from 'react';
import Icon from '../icon';
function noop() {
}

export default class Search extends React.Component {
  handleChange = (e) => {
    this.props.onChange(e);
  }

  handleClear = (e) => {
    e.preventDefault();
    this.props.handleClear(e);
  }

  render() {
    const { placeholder, value, prefixCls } = this.props;
    return (
      <div>
        <input placeholder={placeholder} className={ `${prefixCls} ant-input` } value={ value } ref="input"
          onChange={this.handleChange} />
        { value && value.length > 0 ?
          <a href="#" className={ `${prefixCls}-action` } onClick={this.handleClear}>
            <Icon type="cross-circle" />
          </a>
          : <span className={ `${prefixCls}-action` }><Icon type="search" /></span>
        }
      </div>
    );
  }
}

Search.defaultProps = {
  placeholder: '',
  onChange: noop,
  handleClear: noop,
};

Search.propTypes = {
  prefixCls: PropTypes.string,
  placeholder: PropTypes.string,
  onChange: PropTypes.func,
  handleClear: PropTypes.func,
};