Capturing JavaScript errors with Selenium WebDriver for IE and Chrome

Question

How can I capture JavaScript errors using WebDriver for Chrome and IE drivers?

Dingredient · Accepted Answer · 2013-05-29 20:12:02Z

1

You can execute custom JavaScript to hook into window.onerror.

You can tell your JavaScript to return your data back to Selenium, but because you are asking about errors, I suggest not doing that. Depending on the error, the error could break JavaScript and might prevent it from returning.

A more robust way might be to create a server exposing a handler to the web, to request from your JS.

So your JS to execute from Selenium (before the errors occur) might look like this:

window.onerror = function(message, file, line) {
    var asyncHR = new XMLHttpRequest();
    var URL = "https://www.yourserver.com/errorlogger?file=" + file + "&line=" + line + "&message=" + message;
    asyncHR.open("GET", URL, true);
    asyncHR.send(); 
};

And from there, let the server take care of the logging - write to file, DB, etc...

edited May 29, 2013 at 20:12

answered May 28, 2013 at 17:34

Dingredient

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3 Comments

user2428471 Over a year ago

Hi Pat Meeker,Thanks for your quick reply the above is working for FF browser only but it is not working for IE and Chrome browsers . could you please help me to handle those JS on IE and Chrome???

Dingredient Over a year ago

It seems to be working for me... Try opening this fiddle in your various browsers: jsfiddle.net/YfXZU/3 Perhaps there is an issue with your ChromeDriver and IEDriver. Are your Selenium tests able to otherwise run successfully in those browsers?

Vincent Robert Over a year ago

You can use python -m SimpleHTTPServer 8080 to create a simple HTTP server on the command line if you just want to see the errors for yourself (for debugging) without actually logging anything.

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