Capturing JavaScript error in Selenium
Here's the python webdriver solution I use:
from selenium.common.exceptions import WebDriverException
import logging
def check_browser_errors(driver):
"""
Checks browser for errors, returns a list of errors
:param driver:
:return:
"""
try:
browser_logs = driver.get_log('browser')
except (ValueError, WebDriverException) as e:
# Some browsers does not support getting logs
logging.debug("Could not get browser logs for driver %s due to exception: %s",
driver, e)
return []
errors = [entry for entry in browser_logs if entry['level'] == 'SEVERE']
return errors
I'm doing this to capture JavaScript errors:
[TestCleanup]
public void TestCleanup()
{
var errorStrings = new List<string>
{
"SyntaxError",
"EvalError",
"ReferenceError",
"RangeError",
"TypeError",
"URIError"
};
var jsErrors = Driver.Manage().Logs.GetLog(LogType.Browser).Where(x => errorStrings.Any(e => x.Message.Contains(e)));
if (jsErrors.Any())
{
Assert.Fail("JavaScript error(s):" + Environment.NewLine + jsErrors.Aggregate("", (s, entry) => s + entry.Message + Environment.NewLine));
}
}
Put this script on your page and then check in Selenium for the JSError:
<script type="text/javascript">
window.onerror=function(msg){
$("body").attr("JSError",msg);
}
</script>
Not sure when this changed, but right now this works for me in Python. The file is a simple page with a javascript error.
In [11]: driver.get("file:///tmp/a.html")
In [12]: driver.get_log("browser")
Out[12]:
[{u'level': u'SEVERE',
u'message': u'ReferenceError: foo is not defined',
u'timestamp': 1450769357488,
u'type': u''},
{u'level': u'INFO',
u'message': u'The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol.',
u'timestamp': 1450769357498,
u'type': u''}]
Python-Selenium version 2.48.0 Linux Firefox 43.0