Clipboard support for text/html MIME type

Author: Lxstr

components/dash-core-components/src/components/Clipboard.react.js

@@ -47,9 +47,23 @@ export default class Clipboard extends React.Component {
         return '{' + parts.join(',') + '}';
     }
 
-    async copySuccess(content) {
+    async copySuccess(content, htmlContent) {
         const showCopiedIcon = 1000;
-        await clipboardAPI.writeText(content);
+        if (htmlContent) {
+            const blobHtml = new Blob([htmlContent], {type: 'text/html'});
+            const blobText = new Blob([content ?? htmlContent], {
+                type: 'text/plain',
+            });
+            const data = [
+                new ClipboardItem({
+                    ['text/plain']: blobText,
+                    ['text/html']: blobHtml,
+                }),
+            ];
+            await navigator.clipboard.write(data);
+        } else {
+            await clipboardAPI.writeText(content);
+        }
         this.setState({copied: true});
         await wait(showCopiedIcon);
         this.setState({copied: false});
@@ -85,15 +99,17 @@ export default class Clipboard extends React.Component {
         });
 
         let content;
+        let htmlContent;
         if (this.props.target_id) {
             content = this.getTargetText();
         } else {
             await wait(100); // gives time for callback to start
             await this.loading();
             content = this.props.content;
+            htmlContent = this.props.html_content;
         }
-        if (content) {
-            this.copySuccess(content);
+        if (content || htmlContent) {
+            this.copySuccess(content, htmlContent);
         }
     }
 
@@ -128,6 +144,7 @@ export default class Clipboard extends React.Component {
 
 Clipboard.defaultProps = {
     content: null,
+    html_content: null,
     target_id: null,
     n_clicks: 0,
 };
@@ -146,7 +163,7 @@ Clipboard.propTypes = {
     target_id: PropTypes.oneOfType([PropTypes.string, PropTypes.object]),
 
     /**
-     * The text to  be copied to the clipboard if the `target_id` is None.
+     * The text to be copied to the clipboard if the `target_id` is None.
      */
     content: PropTypes.string,
 
@@ -155,6 +172,11 @@ Clipboard.propTypes = {
      */
     n_clicks: PropTypes.number,
 
+    /**
+     * The clipboard html text be copied to the clipboard if the `target_id` is None.
+     */
+    html_content: PropTypes.string,
+
     /**
      * The text shown as a tooltip when hovering over the copy icon.
      */