Using WebView Evaluate Script Xamarin

Question

I have an html page loaded in Android WebView.

I am attempting to execute a java script function using the MotionEvenAction.Down event.

Here is the code that's not working

 webView.Touch += (s, e) =>
        {
            if (e.Event.Action == MotionEventActions.Down)
            {
                webView.EvaluateJavascript(((string.Format("poweSelected({0})", 3), new JavascriptResult() ));

            }

        };


 public class JavascriptResult : Java.Lang.Object, Android.Webkit.IValueCallback
{
    public string Result;
    public void OnReceiveValue(Java.Lang.Object result)
    {
        string json = ((Java.Lang.String)result).ToString();
        Result = json;

    }
}

I am getting the error message -- (EvaluateJavascript has red line under it)

There is no argument given that corresponds to the required formal parameter 'resultCallback' of 'WebView.EvaluateJavascript(string, IValueCallback)'

As far as I knwo i am implemetnting the ivaluecallback interface correctly and I have found examples exactly like the that seem to be working.

Any help would be appreciated Mark

Typo in your code, try: webView.EvaluateJavascript(string.Format("poweSelected({0})", 3), new JavascriptResult()); — SushiHangover
– SushiHangover, Commented Mar 7, 2018 at 0:14

Robbit · Accepted Answer · 2018-03-07 10:45:00Z

2

Like @Sushi has mentioned:

Replace this:

 webView.EvaluateJavascript(((string.Format("poweSelected({0})", 3), new JavascriptResult() ));

with:

webView.EvaluateJavascript(string.Format("poweSelected({0})", 3), new JavascriptResult());

answered Mar 7, 2018 at 10:45

Robbit

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1 Comment

Mark Over a year ago

Thanks it just takes another set of eyes.

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