升级至Sitecore 9后CSS与JS文件无法加载问题咨询

Hey there, sorry to hear you're stuck with broken static assets post-upgrade—let's walk through the most common fixes that usually get CSS/JS loading again:

• Verify Media Library Path & Configuration
  Sitecore 9 overhauled media handling compared to v7. Double-check:

  • Your web.config settings for sitecore/mediaLibrary/mediaRequestHandler—ensure the virtualFolder matches your expected resource path (e.g., /~/media/ hasn't been accidentally changed).
  • The LinkManager configuration in Sitecore.config—confirm it's generating correct URLs for media items (no missing prefixes or incorrect domain names).

• Check Media Item Permissions & Publishing Status
  Upgrades often reset or tweak item permissions. Make sure:

  • Anonymous users have Read access to the media items containing your CSS/JS files.
  • All relevant media items are published to the web database—Sitecore 9 enforces stricter separation between master and web databases, so unpublished items won't be accessible to end users.

• Clear All Caches
  Cached old paths or corrupted assets are a common culprit. Do a full cache wipe:

  • Use the Sitecore Control Panel (System > Cache > Clear All Caches) to clear Sitecore's internal caches.
  • Delete files in App_Data/Cache manually if the control panel option doesn't cover everything.
  • Clear your browser cache or test in incognito mode to rule out client-side caching.

• Validate Web.config Static Resource Handlers
  Sitecore 9 adds new handlers for static assets, which might have been misconfigured during upgrade:

  • In system.webServer/handlers, ensure that requests for *.css and *.js are either handled by IIS's default static file handler (if your assets are in the filesystem) or by Sitecore's MediaRequestHandler (if they're stored in the Media Library).
  • Look for any conflicting handlers that might be intercepting and dropping resource requests.

• Check CDN or Custom Resource Domain Settings
  If you use a CDN or custom domain for static assets:

  • Verify the cdnHostName setting in Sitecore.config under sitecore/mediaSettings is correctly set to your CDN domain.
  • Ensure the CDN is configured to pull assets from your new Sitecore 9 instance's media endpoint (paths might have changed from v7).

• Dig Into Sitecore Logs for Specific Errors
  When all else fails, check the logs in App_Data/logs for clues:

  • Look for 404 errors linked to your CSS/JS paths—this will tell you if the URL being requested is invalid.
  • Check for permission-denied messages, which indicate access issues to media items.
  • Look for media item not found logs, which might mean items weren't migrated correctly during upgrade.

Start with clearing caches and verifying media permissions/publishing—those are the quickest wins. If those don't resolve it, work through the configuration checks and log analysis to narrow down the issue.

内容的提问来源于stack exchange，提问作者Mark