DropDownList

Copy Codeclass App extends React.Component {
   dropdownlist = null;
   render() {
      return (
         <div>
             <DropDownList
                 data={[ "Albania", "Andorra", "Austria", "Belarus" ]}
                 ref={component => this.dropdownlist = component}
             />
             <button onClick={() => alert(this.dropdownlist.value)}>alert value</button>
         </div>
      );
   }
}
ReactDOM.render(<App />, document.querySelector('my-app'));