## Which problem is this PR solving?

- Resolves #663

## Short description of the changes
- Add a button with download functionality

Signed-off-by: katarzyna <katarzyna@smaato.com>

packages/jaeger-ui/src/components/SearchTracePage/SearchResults/DownloadResults.tsx

@@ -21,10 +21,9 @@ type Props = {
 
 export default function DownloadResults(props: Props) {
   const { onDownloadResultsClicked } = props;
-  const downloadBtn = (
-    <Button className="ub-ml2" htmlType="button" onClick={onDownloadResultsClicked}>
-      Download Results
-    </Button>
+  return (
+      <Button className="ub-ml2" htmlType="button" onClick={onDownloadResultsClicked}>
+        Download Results
+      </Button>
   );
-  return <>{downloadBtn}</>;
 }

packages/jaeger-ui/src/components/SearchTracePage/SearchResults/index.tsx

@@ -116,7 +116,7 @@ export class UnconnectedSearchResults extends React.PureComponent<SearchResultsP
     const file = new Blob([JSON.stringify(this.props.rawTraces)], { type: 'application/json' });
     const element = document.createElement('a');
     element.href = URL.createObjectURL(file);
-    element.download = 'traces-' + Date.now() + '.json';
+    element.download = `traces-${Date.now()}.json`;
     document.body.appendChild(element);
     element.click();
     URL.revokeObjectURL(element.href);