Python Selenium UnexpectedAlertPresentException

Question

I am running basic CRUD tests with python and lettuce using selenium webdriver.

All of my other tests run fine, but when I click "Delete", there is a modal dialog which asks the user to confirm that they want to delete that user. The moment the popup appears, I get the exception below. I have wasted 2 hours trying to get this to work. I would imagine there is a simple fix.

 File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 164, in check_response
    raise exception_class(message, screen, stacktrace)
UnexpectedAlertPresentException: Message: u'Modal dialog present' ; Stacktrace: 
    at nsCommandProcessor.prototype.execute (file:///tmp/tmpeV2K89/extensions/[email protected]/components/command_processor.js:11520:13)

The line in steps.py that is throwing the error is this.

  world.browser.find_element_by_link_text("Delete User").click()

And the html for that element is this.

<a href="/users/5910974510923776/delete" onclick="return confirm('Are you sure you want to delete this user?');">Delete User</a>

If its an alert use (as in java) d.switchTo().alert().accept(); (please find equivalent binding in python). If its a modal dialog then i guess u can try finding the locator of ok. — Vivek Singh
– Vivek Singh, Commented Feb 8, 2015 at 18:07
@VivekSingh it's just driver.switch_to_alert.accept() or even driver.switch_to.alert.accept(). I've found slightly differences on both mehods so thought that's important to advice for anyone struggling around that. The same thing applies to the driver.switch_to.window() method. — m3nda
– m3nda, Commented May 24, 2016 at 1:11

Burak Kaymakci · Accepted Answer · 2020-09-11 14:53:18Z

37

You need to switch to the alert and accept it:

world.browser.find_element_by_link_text("Delete User").click()
alert = world.browser.switch_to.alert
alert.accept()

edited Sep 11, 2020 at 14:53

Burak Kaymakci

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answered Feb 8, 2015 at 19:36

alecxe

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7 Comments

andygimma Over a year ago

It's not letting me get to world.browser.switch_to_alert(). I tried that, it's failing on the line before and won't go beyond it.

alecxe Over a year ago

@andygimma so, it looks like there is an alert opened before you click on the Delete User button.

andygimma Over a year ago

I had a typo, your answer was correct. I don't have enough reputation points to upvote you though. Thanks!

alecxe Over a year ago

@1nflktd good point, though it should be .switch_to.alert(). (no need to call switch_to ). Thanks.

yaobin Over a year ago

@alecxe: Should it be .switch_to.alert() or just .switch_to.alert? I'm using Python 2.7 and Selenium 2.46.0, and if I try .switch_to.alert(), I will get a "TypeError: 'Alert' object is not callable" exception. The source code shows that alert is decorated by @property so I think we should call it without the parentheses.

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