JavaScript dialogs are fairly common in web applications.

Watir-WebDriver has an inbuilt library for handling the dialogs, and capturing values from the dialogs. First, require the extension:

require "watir-webdriver/extensions/alerts"

JavaScript Alerts

browser.alert do
  browser.button(:value => 'Alert').click
end #=> 'the alert message'

JavaScript Confirms

browser.confirm(true) do
  browser.button(:value => 'Confirm').click
end #=> 'the confirm message'

JavaScript Prompt

browser.prompt('hello') do
  browser.button(:value => 'Prompt').click
end #=> { :message => 'foo', :default_value => 'bar' }

Alternative Method

If you’re having trouble using the above method, you can override the JavaScript functions to return the value you want, so when they’re meant to show, they don’t!

# don't return anything for alert
browser.execute_script("window.alert = function() {}")

# return some string for prompt to simulate user entering it
browser.execute_script("window.prompt = function() {return 'my name'}")

# return null for prompt to simulate clicking Cancel
browser.execute_script("window.prompt = function() {return null}")

# return true for confirm to simulate clicking OK
browser.execute_script("window.confirm = function() {return true}")

# return false for confirm to simulate clicking Cancel
browser.execute_script("window.confirm = function() {return false}")