Is there a way to catch Web console errors?

Question

Using WebView, certain websites take very long time to complete page load (as in WebViewClient.onPageFinished()) and, when that happens, this is characterize by Web Console errors of the following type:

E/Web Console(1916): Unsafe JavaScript attempt to access frame with URL
  http://mobile.example.com from frame with URL 
  http://ad.doubleclick.net/adi/interactive.example.com/front_sub;sz=320x50;ord=7340930261983.
  Domains, protocols and ports must match.
  05-26 10:44:15.274: E/Web Console(1916):  at null:1

I would like to be able to catch those errors and handle them in some way. e.g. issue a message or anything relevant to my app, actual handling is irrelevant at this point to the core question:

Is there a way to catch those errors? i.e. in a way that my app can be notified?

Note: This is not a Javascript question. I am not programming a website. I am accessing an existing website whose implementation is beyond my control. This is a WebView question (currently in the Android environment, but could be in other environments which are capable of hosting WebView as well).

**Note:** This is not a WebView question. This is a "How do I read logs?" question. — ozbek, May 26 '13 at 15:06
A quick search yeilds [this](http://stackoverflow.com/questions/11461650/read-logs-permission-on-jelly-bean-api-16). I am afraid, you are out of luck with this. — ozbek, May 26 '13 at 15:08
I don't think OP wants to read the logs, I think he wants to catch the error that generated the log message, and handle it himself. — Edward Falk, May 26 '13 at 15:10
@shoerat Reading logs of other apps (or even system logs) is a horse of different color: (1) This type of log **is** received in the context of my app. (2) I hope that I don't need to intercept log messages in order to know about this event. I am hoping for some type of exception thrown or onReceivedError() notification, similar to the one that occurs on SSL errors. Is that possible? — scatmoi, May 26 '13 at 15:12
AFAIK there is no notification for that. The best you can do is to monitor LogCat using AsyncTask following the example code in [this SO thread](http://stackoverflow.com/q/12692103) or even better [this open-source app](http://code.google.com/p/android-logger/). Good luck. — uTubeFan, May 27 '13 at 00:47

score 6 · Accepted Answer · edited Jun 12 '13 at 10:47

6

Do you have an example of a website?

You should be able to override WebChromeClient.onConsoleMessage(ConsoleMessage consoleMessage).

edited Jun 12 '13 at 10:47

Lalit Poptani

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answered May 27 '13 at 21:02

Kristian

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score 0 · Answer 2 · edited Apr 17 '14 at 15:49

0

I suggest this example provided by google for Debugging Web Apps

Notice that only "part1" is shown when you provide a comma delimited list of paramters within the console.log function, here is a piece of javascript code to test that:

console.log("part1","part2");

The result will be:

part1 -- From line 1 of http://example.js10/test.js

edited Apr 17 '14 at 15:49

Hamid Shatu

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answered Apr 17 '14 at 15:27

Sofiane

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score 0 · Answer 3 · answered Dec 15 '21 at 08:16

As @Kristian posted here we can do like below,

 final WebView webView = (WebView) findViewById(R.id.webview);

WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true); // make sure JS enabled as true

webView.setWebChromeClient(new WebChromeClient() {
    @Override
    public boolean onConsoleMessage(ConsoleMessage consoleMessage) {
        Log.d(getClass().toString(), consoleMessage.message() + " -- From line "
                + consoleMessage.lineNumber() + " of "
                + consoleMessage.sourceId());
        return super.onConsoleMessage(consoleMessage);
    }
});

webView.loadUrl(getString(R.string.url_google));

Is there a way to catch Web console errors?

3 Answers3