PLT-5190 fixing javasscript error on RHS (#5068)

* PLT-5190 fixing javasscript error on RHS

* PLT-5190 fixing javasscript error on RHS

webapp/components/search_bar.jsx

@@ -2,7 +2,6 @@
 // See License.txt for license information.
 
 import $ from 'jquery';
-import ReactDOM from 'react-dom';
 import Client from 'client/web_client.jsx';
 import * as AsyncClient from 'utils/async_client.jsx';
 import * as GlobalActions from 'actions/global_actions.jsx';
@@ -124,8 +123,8 @@ export default class SearchBar extends React.Component {
                 isMentionSearch,
                 (data) => {
                     this.setState({isSearching: false});
-                    if (Utils.isMobile()) {
-                        ReactDOM.findDOMNode(this.refs.search).value = '';
+                    if (Utils.isMobile() && this.search) {
+                        this.search.value = '';
                     }
 
                     AppDispatcher.handleServerAction({
@@ -147,7 +146,7 @@ export default class SearchBar extends React.Component {
     handleSubmit(e) {
         e.preventDefault();
         this.performSearch(this.state.searchTerm.trim());
-        $(ReactDOM.findDOMNode(this.refs.search)).find('input').blur();
+        $(this.search).find('input').blur();
         this.clearFocus();
     }
 
@@ -276,7 +275,9 @@ export default class SearchBar extends React.Component {
                 >
                     <span className='fa fa-search sidebar__search-icon'/>
                     <SuggestionBox
-                        ref='search'
+                        ref={(search) => {
+                            this.search = search;
+                        }}
                         className='form-control search-bar'
                         placeholder={Utils.localizeMessage('search_bar.search', 'Search')}
                         value={this.state.searchTerm}