SearchAndDisplayComponent.js

class ProductCategoryRow extends React.Component {
  render() {
    const category = this.props.category;
    return (
      <tr>
        <th colSpan="2">
          {category}
        </th>
      </tr>
    );
  }
}

class ProductRow extends React.Component {
  render() {
    const product = this.props.product;
    const name = product.stocked ?
      product.name :
      <span style={{color: 'red'}}>
        {product.name}
      </span>;

    return (
      <tr>
        <td>{name}</td>
        <td>{product.price}</td>
      </tr>
    );
  }
}

class ProductTable extends React.Component {
  render() {
    const filterText = this.props.filterText;
    const inStockOnly = this.props.inStockOnly;

    const rows = [];
    let lastCategory = null;

    this.props.products.forEach((product) => {
      if (product.name.indexOf(filterText) === -1) {
        return;
      }
      if (inStockOnly && !product.stocked) {
        return;
      }
      if (product.category !== lastCategory) {
        rows.push(
          <ProductCategoryRow
            category={product.category}
            key={product.category} />
        );
      }
      rows.push(
        <ProductRow
          product={product}
          key={product.name}
        />
      );
      lastCategory = product.category;
    });

    return (
      <table>
        <thead>
          <tr>
            <th>Name</th>
            <th>Price</th>
          </tr>
        </thead>
        <tbody>{rows}</tbody>
      </table>
    );
  }
}

class SearchBar extends React.Component {
  constructor(props){
    super(props);
    this.handlerTextChanged = this.handlerTextChanged.bind(this);
    this.handlerCheckChanged = this.handlerCheckChanged.bind(this);
  }
  
  handlerTextChanged(e){
    this.props.onTextChange(e.target.value);
  }
  handlerCheckChanged(e){
    console.log(e.target.checked);
    this.props.onStockChange(e.target.checked);
  }
  render() {
    const filterText = this.props.filterText;
    const inStockOnly = this.props.inStockOnly;

    return (
      <form>
        <input
          type="text"
          placeholder="Search..."
          value={filterText}
          onChange={this.handlerTextChanged}
            />
        <p>
          <input
            type="checkbox"
            checked={inStockOnly}
            onChange={this.handlerCheckChanged}
            />
          {' '}
          Only show products in stock
        </p>
      </form>
    );
  }
}

class FilterableProductTable extends React.Component {
  constructor(props) {
    super(props);
    this.state = {filterText: '', inStockOnly: false};
    this.handleInputChanged = this.handleInputChanged.bind(this);
    this.handleCheckChanged = this.handleCheckChanged.bind(this);
  }
  
  handleInputChanged(filter){
    this.setState( {filterText: filter} );
  }
  handleCheckChanged(inStock){
    this.setState( {inStockOnly: inStock} );
  }

  render() {
    return (
      <div>
        <SearchBar
          filterText={this.state.filterText}
          inStockOnly={this.state.inStockOnly}
          onTextChange={this.handleInputChanged}
          onStockChange={this.handleCheckChanged}
        />
        <ProductTable
          products={this.props.products}
          filterText={this.state.filterText}
          inStockOnly={this.state.inStockOnly}
        />
      </div>
    );
  }
}


const PRODUCTS = [
  {category: 'Sporting Goods', price: '$49.99', stocked: true, name: 'Football'},
  {category: 'Sporting Goods', price: '$9.99', stocked: true, name: 'Baseball'},
  {category: 'Sporting Goods', price: '$29.99', stocked: false, name: 'Basketball'},
  {category: 'Electronics', price: '$99.99', stocked: true, name: 'iPod Touch'},
  {category: 'Electronics', price: '$399.99', stocked: false, name: 'iPhone 5'},
  {category: 'Electronics', price: '$199.99', stocked: true, name: 'Nexus 7'}
];

ReactDOM.render(
  <FilterableProductTable products={PRODUCTS} />,
  document.getElementById('root')
);