how to handle javascript alerts in selenium using python

Question

So I there is this button I want to click and if it's the first time you've clicked it. A javascript alert popup will appear. I've been using firebug and just can't find where that javascript is located and I've tried

if EC.alert_is_present:
        driver.switch_to_alert().accept()
else:
    print("no alert")

the above code works if there is an alert box but will throw an error if there is none. even though there is an else statement I've even tried

   if EC.alert_is_present:
            driver.switch_to_alert().accept()
   elif not EC.alert_is_present:
               print("no alert")

it throws me this error

selenium.common.exceptions.NoAlertPresentException: Message: No alert is present

how do we get around this?

Could this be the root cause? A bypassed call to fxdriver.modals.clearFlag_ ... cf. https://stackoverflow.com/questions/44568402/how-do-i-manually-mouse-dismiss-a-javascript-alert-and-get-back-the-the-body-o/44592827#44592827 — NevilleDNZ, Jun 16 '17 at 23:58

score 8 · Accepted Answer · edited May 10 '15 at 16:42

8

Use try catch and if the Alert is not present catch NoAlertPresentException exception:

from selenium.common.exceptions import NoAlertPresentException

try:
    driver.switch_to_alert().accept()
except NoAlertPresentException as e: 
    print("no alert")

edited May 10 '15 at 16:42

alecxe

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answered May 10 '15 at 00:09

Saifur

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name 'NoAlertPresentException' is not defined. this was the output. how do we define it? – Halcyon Abraham Ramirez May 10 '15 at 00:13
What is the stacktrace? – Saifur May 10 '15 at 00:14
Try `selenium.common.exceptions.NoAlertPresentException` instead of `NoAlertPresentException` – Saifur May 10 '15 at 00:14
During handling of the above exception, another exception occurred: Traceback (most recent call last): File "C:\Python34\test.py", line 1995, in except (NoAlertPresentException) as e: NameError: name 'NoAlertPresentException' is not defined – Halcyon Abraham Ramirez May 10 '15 at 00:15
still doesn't work. I'll include all the error messages – Halcyon Abraham Ramirez May 10 '15 at 00:57
How about importing `from selenium.common.exceptions import NoAlertPresentException `? – Saifur May 10 '15 at 00:59
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/77422/discussion-between-halcyon-abraham-ramirez-and-saifur). – Halcyon Abraham Ramirez May 10 '15 at 01:04

Louis · Answer 2 · 2017-07-21T11:43:45.960

4

This is how you do it:

from selenium.common.exceptions import NoAlertPresentException
try:
    context.driver.switch_to.alert.accept()
except NoAlertPresentException:
    pass

You can replace pass with a print statement if you wish. Note the use of switch_to.alert rather than switch_to_alert(). The latter has been deprecated for a while. In the version of Selenium I have here, I see this in its code:

warnings.warn("use driver.switch_to.alert instead", DeprecationWarning)

edited Jul 21 '17 at 11:43

answered May 10 '15 at 01:10

Louis

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May I know why we should not use `switch_to_alert()` ? – Nam G VU Jul 21 '17 at 02:20

how to handle javascript alerts in selenium using python

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