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"""

Two ways for intercepting Javascript errors:

1. window.onerror event in Javascript

2. DisplayHandler.OnConsoleMessage in Python

"""

from cefpython3 import cefpython as cef

g_htmlcode = """

<!doctype html>

<html>

<head>

<style>

body, html {

font-family: Arial;

font-size: 11pt;

}

</style>

function print(msg) {

document.getElementById("console").innerHTML += msg+"<br>";

}

window.onerror = function(message, source, lineno, colno, error) {

print("[JS:window.onerror] "+error+" (line "+lineno+")");

// Return false so that default event handler is fired and

// OnConsoleMessage can also intercept this error.

return false;

};

window.onload = function() {

forceError();

};

</script>

</head>

<body>

<h1>Javascript Errors</h1>

</body>

</html>

"""

def main():

cef.Initialize()

browser = cef.CreateBrowserSync(url=cef.GetDataUrl(g_htmlcode),

window_title="Javascript Errors")

browser.SetClientHandler(DisplayHandler())

cef.MessageLoop()

cef.Shutdown()

class DisplayHandler(object):

def OnConsoleMessage(self, browser, message, line, **_):

if "error" in message.lower() or "uncaught" in message.lower():

logmsg = "[Py:OnConsoleMessage] {message} (line {line})" \

.format(message=message, line=line)

print(logmsg)

browser.ExecuteFunction("print", logmsg)

if __name__ == '__main__':

main()

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