Xamarin Forms getting details of failed WebView navigation

Question

I have a handler for the Navigated event of a WebView. Sometimes the navigation fails and the WebNavigatedEventArgs parameter of the handler has its property Result equals to WebNavigationResult.Failure.

Is there a way to get further information about the cause of the failure? Like a network access error, DNS error, a timeout, etc.?

Thank you

Answer 1

Hello,​

Is there a way to get further information about the cause of the failure? Like a network access error, DNS error, a timeout, etc.?

You can create a custom renderer for your WebView.
For Android, you can achieve WebViewClient class, get the further information about the cause of the failure from OnReceivedHttpError method.

   public class CustomWebViewRenderer: WebViewRenderer  
       {  
           protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)  
           {  
               base.OnElementChanged(e);  
     
               Control.SetWebViewClient(new MyWebViewClient());  
           }  
       }  
     
       public class MyWebViewClient : Android.Webkit.WebViewClient  
       {  
           public override void OnReceivedHttpError(Android.Webkit.WebView view, Android.Webkit.IWebResourceRequest request, Android.Webkit.WebResourceResponse errorResponse)  
           {  
   //get error from errorResponse  
               base.OnReceivedHttpError(view, request, errorResponse);  
           }   
       }  

For iOS, you can achieve WKNavigationDelegate in webview's custom renderer and get error from DidFailProvisionalNavigation method.

   public class CustomWebViewRenderer : WkWebViewRenderer  
       {  
            
           protected override void OnElementChanged(VisualElementChangedEventArgs e)  
           {  
               base.OnElementChanged(e);  
                
               if (e.OldElement == null)  
               {  
                   NavigationDelegate = new CustomWebViewDelegate();  
               }  
           }  
     
       internal class CustomWebViewDelegate : WKNavigationDelegate {   
           public override void DidFailProvisionalNavigation(WKWebView webView, WKNavigation navigation, NSError error)  
           {  
            
               switch (error.Code)  
               {  
                   case -1009: // no internet access  
                       {  
                          
                           break;  
                       }  
                   case -1001: // timeout  
                       {  
                           
                           break;  
                       }  
                   case -1003: // server cannot be found  
                   case -1100: // url not found on server  
                   default:  
                       {  
                             
                           break;  
                       }  
               }  
     
           }  
       }  

Best Regards,

Leon Lu

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