Why Does the SharePoint Script Editor Web Part Disappear? Fixed
Question details
The user needs to understand why a Script Editor web part vanishes from their SharePoint page and how to resolve the issue so the JavaScript code remains saved.
- Product
- Microsoft SharePoint
- Device & OS
- not provided
- Scenario
- Adding or editing custom JavaScript within a Script Editor web part on a SharePoint page.
- Observed behavior
- The web part disappears intermittently, sometimes returning after a page refresh, but previously entered JavaScript code is lost and must be re-entered.
Verify that you have site owner or global administrator privileges in your SharePoint environment, as modifying script permissions requires administrative access.
Enable Custom Scripts in SharePoint Admin Center
Modern SharePoint environments often block custom scripts by default for security reasons. Enabling custom scripting allows the Script Editor web part to function without being restricted or stripped from the page.
By default, SharePoint Online restricts the execution of custom scripts on self-service created sites and personal sites. If you are using a classic Script Editor web part, SharePoint's security filters may automatically remove it during rendering.
Log in to the Microsoft 365 admin center and navigate to the SharePoint Admin Center using a global or SharePoint admin account.
Click on 'Settings' in the left-hand navigation pane, then select the 'classic settings page' link located at the bottom of the page.
Scroll down to the 'Custom Script' section. Select the options to 'Allow users to run custom script on personal sites' and 'Allow users to run custom script on self-service created sites'.
Click 'OK' at the bottom of the page to save your changes. Note that it may take up to 24 hours for this configuration to propagate across your SharePoint environment.
Seek Assistance on Microsoft Q&A for SharePoint Framework
If enabling custom scripts does not resolve the issue, the problem may be rooted in JavaScript conflicts or modern page development constraints that require expert developer guidance.
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Frequently Asked Questions
Can I use the classic Script Editor web part on modern SharePoint pages?
Natively, the classic Script Editor is not designed for modern SharePoint pages and is generally unsupported. Developers typically use third-party modern Script Editor web parts built with the SharePoint Framework (SPFx) for modern site compatibility.
Why does my JavaScript disappear immediately after I refresh the page?
This usually happens because SharePoint's site-level security is configured to block custom scripts. When the page renders, the security filter automatically detects and strips out the unsupported script elements.
How can I recover the JavaScript code that was lost from the web part?
If the web part failed to save the code to the SharePoint database before vanishing, the code cannot be recovered natively. It is highly recommended to always draft and back up your custom scripts in a local text editor before pasting them into SharePoint.
