Creating alert window in browser with python selenium

Question

I want create alert window in browser.

browser = webdriver.Firefox(
    executable_path=geckodriver_path,
    log_path=geckodriver_log_path
)
browser.get(url)

To create alert window I doing:

browser.execute_script("alert('qwer');")

or

browser.execute_script("return alert('qwer');")

or

browser.execute_script("return (function(){alert('qwer'); return 0;})();")

In all cases alert window was displayed. But in all cases I have an Exception: selenium.common.exceptions.WebDriverException: Message: Failed to find value field.

What is right way to create alert window?

Can you try a different browser? Chromedriver for example. It appears to be a Firefox-related issue. — leovp
– leovp, Commented Mar 22, 2017 at 8:57

Andersson · Accepted Answer · 2017-03-22 09:11:24Z

4

This seem to be geckodriver issue. Despite of generated "Failed to find value field" exception you still can handle opened alert, so you might apply below workaround:

from selenium.common.exceptions import WebDriverException

try:
    browser.execute_script("alert('qwer');")
except WebDriverException:
    pass
browser.switch_to.alert.text # output is "qwer"
browser.switch_to.alert.accept() # alert closed

...or, as was mentioned in comments, you can use Chrome, IE, etc

answered Mar 22, 2017 at 9:11

Andersson

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