How to intercept "a redirect URL" from webview in Xamarin Forms

Issue

I'm displaying an OAtuh2 HTML page in WebView that returns me, after clicking on a validation button that is on this page, a redirect URL that I would like to intercept to use the information from it.

in XML file

<ContentPage.Content>
    <WebView x:Name="browser"></WebView>
</ContentPage.Content>

in CS file

browser.Source = "https://myUrl";

My low knowledge in Xamarin doesn't allow me to know how to do it

Thanks for your help

Solution

You can do as ToolmakerSteve mentioned using WebNavigatingEventArgs.

And for details you can implement this on each specific platform with custom renderer .

iOS

[assembly: ExportRenderer(typeof(WebView), typeof(MyRenderer))]
namespace FormsApp.iOS
{
    class MyRenderer : WkWebViewRenderer
    {

        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);

            this.NavigationDelegate = new MyDelegate();
        }
    }

    public class MyDelegate : WKNavigationDelegate
    {
        public override void DecidePolicy(WKWebView webView, WKNavigationAction navigationAction, Action<WKNavigationActionPolicy> decisionHandler)
        {
            if(navigationAction.NavigationType == WKNavigationType.Other)
            {
                if(navigationAction.Request.Url != null)
                {
                    //do something
                }
                decisionHandler(WKNavigationActionPolicy.Cancel);
                return;
            }
            decisionHandler(WKNavigationActionPolicy.Allow);
        }
    }
}

Android

[assembly: ExportRenderer(typeof(Xamarin.Forms.WebView), typeof(MyRenderer))]
namespace FormsApp.Droid
{
    class MyRenderer : WebViewRenderer
    {
        public MyRenderer(Context context):base(context)
        {

        }

        protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.WebView> e)
        {
            base.OnElementChanged(e);

            if (Control != null)
            {
                Control.SetWebViewClient(new MyClient());
            }
        }
    }

    public class MyClient : WebViewClient
    {
        public override bool ShouldOverrideUrlLoading(Android.Webkit.WebView view, IWebResourceRequest request)
        {
            //do something
            return true;
        }
    }
}

Refer to

https://stackoverflow.com/a/45604360/8187800

https://stackoverflow.com/a/4066497/8187800

Answered By - ColeX - MSFT