alert dialog from javascript not appear in xamarin crosswalk webview

Setting the WebChromeClient is needed to get the alert() , try set it like :

mWebView.getSettings().setJavaScriptEnabled(true);
mWebView.setWebChromeClient(new WebChromeClient());

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Take a look at this discussion, It may be helpful in your case :

https://issuetracker.google.com/issues/36905249

yes this is for  built-in web view  but for crosswalk web view alert not working by default in Xamarin  like android studio i search google a lot didn't find anything it had to be some solution

Ok, I see, could you please share with as the relevant part of your code.

sure this is what i tried :

using Android.App;
using Android.Widget;
using Android.OS;
using System;
using Android.Views;
using Android.Content.Res;
using System.IO;

using Android.Util;
using Android.Content;
using System.Threading;
using System.Threading.Tasks;
using System.Text;
using System.Text.RegularExpressions;
using Org.Xwalk.Core;

namespace XWalk
{
    [Activity(Label = "XWalk", MainLauncher = true)]
    public class MainActivity : XWalkActivity
    {

        public static Activity fa;
        public Org.Xwalk.Core.XWalkView xwv;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);
        }

        protected override void OnXWalkReady()
        {
            fa = this;

            var view = new RelativeLayout(this.BaseContext);
            var mp = ViewGroup.LayoutParams.MatchParent;
            xwv = new Org.Xwalk.Core.XWalkView(this.BaseContext, this);
            view.AddView(xwv);
            this.AddContentView(view, new ViewGroup.LayoutParams(mp, mp));
            XWalkPreferences.SetValue("enable-javascript", true);
            xwv.SetResourceClient(new XWalkResourceClient(xwv));\\ this code should work
            xwv.SetUIClient(new XWalkUIClient(xwv));\\or this
            xwv.LoadUrl("file:///android_asset/index.html");
   
        }
}
}

but its not working ..

Could you check if the JS is enabled using "getJavaScriptEnabled()" and make sure there's no message error logged.

JavaScript is enabled by default and i test it in other js function and its working  but the alert function and anything need dialog is not appears  so i even hired some one to find me an answer and i'm still waiting because i really supersized that i didn't find any easy solution for this issue

when i press  this HTML component it should give me dialog :

 <select>
            <option value="volvo">Volvo</option>
            <option value="saab">Saab</option>
            <option value="mercedes">Mercedes</option>
            <option value="audi">Audi</option>
        </select>

i get this in log output :

01-16 12:07:42.117 V/BoostFramework( 5609): BoostFramework() : mPerf = com.qualcomm.qti.Performance@48196b1
01-16 12:07:42.117 D/HwCust  ( 5609): Create obj success use class android.widget.HwCustTextViewImpl
01-16 12:07:42.127 D/HwCust  ( 5609): Create obj success use class android.widget.HwCustTextViewImpl
01-16 12:07:42.127 D/HwCust  ( 5609): Create obj success use class android.widget.HwCustTextViewImpl
01-16 12:07:42.137 D/HwCust  ( 5609): Create obj success use class android.widget.HwCustTextViewImpl
01-16 12:07:42.147 E/Dialog  ( 5609): show mWindowManager.addView RuntimeException