dispatch/client/src/js/components/pages/Chat/Search.js

import React, { PureComponent } from 'react';
import SearchResult from './SearchResult';

export default class Search extends PureComponent {
  componentDidUpdate(prevProps) {
    if (!prevProps.search.show && this.props.search.show) {
      this.input.focus();
    }
  }

  inputRef = el => {
    this.input = el;
  };

  handleSearch = e => this.props.onSearch(e.target.value);

  render() {
    const { search } = this.props;
    const style = {
      display: search.show ? 'block' : 'none'
    };

    const results = search.results.map(result => (
      <SearchResult key={result.id} result={result} />
    ));

    return (
      <div className="search" style={style}>
        <div className="search-input-wrap">
          <i className="icon-search" />
          <input
            ref={this.inputRef}
            className="search-input"
            type="text"
            onChange={this.handleSearch}
          />
        </div>
        <div className="search-results">{results}</div>
      </div>
    );
  }
}