I’m working on a tool to check a website before it goes live. It looks for things like missing content, slow loading, and other problems. Now I need to add a feature to spot JavaScript errors on the pages.
I know I can’t just use JavaScript to catch all errors. That won’t work well enough. What I really want is to get the text from the JavaScript console. I think CoreWebView2 might be able to do this, but I’m not sure how.
Does anyone know a good way to watch for JavaScript errors in WebView2 or CoreWebView2? I’d love to hear about any methods that work well for this kind of task.
I’ve found a reliable approach for monitoring JavaScript errors in WebView2. The key is leveraging the ExecuteScriptAsync method combined with a custom error handler. Here’s what worked for me:
First, inject a script that overrides the default error handling. Then, use ExecuteScriptAsync to periodically check for any captured errors. This method allows you to retrieve detailed error information, including stack traces.
One caveat: make sure to implement proper error handling in your own code to avoid infinite loops. Also, be aware that this approach might not catch all errors, especially those occurring during page load.
For more robust monitoring, consider combining this with the DevToolsProtocolEventReceived event mentioned earlier. This dual approach has served me well in similar projects.
For monitoring JavaScript errors in WebView2, I’ve had success using the CoreWebView2.AddScriptToExecuteOnDocumentCreatedAsync method. This approach allows you to inject a custom error handler into every page loaded in the WebView2 control.
Here’s the gist of it: You can create a script that overrides the window.onerror function to capture error details. Then, use a custom event to pass these errors back to your C# code. You’ll need to set up a corresponding event handler in your application to receive and process these error events.
This method has proven quite effective in my experience, as it catches most JavaScript errors, including those occurring during initial page load. Just remember to implement proper error handling in your injected script to avoid potential issues.
hey there! i’ve dealt with this before. you can use the DevToolsProtocolEventReceived event in CoreWebView2. it lets u intercept console messages. just subscribe to the event and filter for console.error entries. works great for catching js errors! lmk if u need more details