How do I confirm a javascript popup with Capybara?

I've tried several examples found online, but with no luck. I am looking to confirm the confirm message of a delete link. The last attempt was the code below, but that resulted in an Capybara::NotSupportedByDriverError error.

def confirm_dialog
  page.evaluate_script('window.confirm = function() { return true; }')
end

Solution 1:

Adding an answer for those hitting this in 2016 and beyond. You can now use Capybara directly to accept a confirmation box. You do this by wrapping the code that causes the confirmation box to appear in the accept_confirm function.

accept_confirm do
  click_link 'Destroy'
end

Solution 2:

First of all switch to using Selenium as the driver by putting an @javascript tag in front of your scenario.

The following code in your cucumber step will then confirm the dialogue:

page.driver.browser.switch_to.alert.accept
# or
page.driver.browser.switch_to.alert.dismiss
# or
page.driver.browser.switch_to.alert.text

As @NobbZ said, this question has been asked and answered before here: How to test a confirm dialog with Cucumber?.

More selenium documentation available here too: http://code.google.com/p/selenium/wiki/RubyBindings#JavaScript_dialogs

Solution 3:

for capybara-webkit:

page.driver.browser.accept_js_confirms
page.driver.browser.reject_js_confirms

which is still working, but the documentation says also:

page.driver.accept_js_confirms!
page.driver.accept_js_confirms!

See https://github.com/thoughtbot/capybara-webkit , search "accept_js_confirms"