Added new kb article disable-grammarly-radeditor (#651)

Co-authored-by: KB Bot <kb-bot@telerik.com>

knowledge-base/disable-grammarly-radeditor.md

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+---
+title: Disabling Grammarly in RadEditor for ASP.NET AJAX
+description: Learn how to prevent Grammarly from interfering with RadEditor by disabling it using JavaScript and CSS.
+type: troubleshooting
+page_title: How to Disable Grammarly Extension in RadEditor for ASP.NET AJAX
+slug: disable-grammarly-radeditor
+tags: radeditor, asp.net ajax, grammarly, javascript, css
+res_type: kb
+ticketid: 1676891
+---
+
+## Environment
+
+<table>
+<tbody>
+<tr>
+<td>Product</td>
+<td>RadEditor for ASP.NET AJAX</td>
+</tr>
+<tr>
+<td>Version</td>
+<td>2024.4.1114</td>
+</tr>
+</tbody>
+</table>
+
+## Description
+When using [RadEditor for ASP.NET AJAX](https://docs.telerik.com/devtools/aspnet-ajax/controls/editor/overview), Grammarly can introduce performance issues and unwanted HTML tags. To ensure smooth operation of RadEditor, disabling Grammarly within its content area is necessary.
+
+## Cause
+Grammarly interacts with content-editable elements, such as the content area of RadEditor, causing unwanted behavior and performance degradation.
+
+## Solution
+
+To prevent Grammarly from affecting RadEditor, follow these steps:
+
+1. Disable Grammarly in the content area of RadEditor by setting specific attributes to `false`. Implement the JavaScript function `OnClientLoad` and assign it to the RadEditor's `OnClientLoad` property.
+
+```javascript
+<script>
+    function OnClientLoad(editor, args) {
+        const contentArea = editor.get_contentArea();
+        contentArea.setAttribute('data-gramm', 'false');
+        contentArea.setAttribute('data-gramm_editor', 'false');
+        contentArea.setAttribute('data-enable-grammarly', 'false');
+    }
+</script>
+<telerik:RadEditor OnClientLoad="OnClientLoad" runat="server" ID="RadEditor1"></telerik:RadEditor>
+```
+
+2. Use CSS to hide any Grammarly extensions that might still appear. Add the following CSS rules to your application:
+
+```css
+[contenteditable] ~ grammarly-extension,
+input ~ grammarly-extension,
+textarea ~ grammarly-extension {
+    display: none !important;
+}
+```
+
+This will ensure that Grammarly extensions are not visible, further reducing their impact on RadEditor.
+
+### Additional Checks
+
+- **Inspect HTML**: Use Developer Tools to ensure the attributes are correctly applied to the RadEditor's content area.
+- **Content Area Mode**: Switch between `Iframe` and `Div` modes based on your application's requirements. Grammarly does not function in the `Iframe` mode.
+- **JavaScript Errors**: Check for and resolve any JavaScript errors that might prevent the disabling script from executing.
+- **Browser and Environment**: Test in various browsers and environments to rule out browser-specific issues.
+- **Isolate the Issue**: Create a simple test page to determine if external factors are affecting RadEditor.
+
+By implementing these steps, you can disable Grammarly in RadEditor, ensuring it operates without interference.
+
+## See Also
+
+- [RadEditor Overview](https://docs.telerik.com/devtools/aspnet-ajax/controls/editor/overview)
+- [Editable DIV Content Area Demo](https://demos.telerik.com/aspnet-ajax/editor/examples/contentareamodediv/defaultcs.aspx)
+- [How to stop extensions/add-ons like Grammarly on contenteditable editors](https://stackoverflow.com/questions/37444906/how-to-stop-extensions-add-ons-like-grammarly-on-contenteditable-editors)