WebRat+Selenium WebDriver: wait for ajax to be completed
Question
We are running Webrat with Selenium2.0 aka WebDriver in our application.
WebDriver handles page reloading very well and do not start next steps if the browser is reloading entire page. The problem is that this mechanism doesn't work with Ajax requests. WebDriver doesn't do any idle when there some after click() or change().
Can anyone suggest how to make webdriver idle until the end of all ajax requests on the page?
Solution
We ended up writing a layer over selenium that handled this scenario by wrapping the calls in an optional loop. So when you'd do:
@browser.click "#my_button_id"
it would do something similar to what AutomatedTester suggested above:
class Browser
def click(locator)
wait_for_element(locator, :timeout => PAGE_EVENT_TIMEOUT)
@selenium.click(locator)
end
def wait_for_element(locator, options)
timeout = options[:timeout] || PAGE_LOAD_TIMEOUT
selenium_locator = locator.clone
expression = <<EOF
var element;
try {
element = selenium.browserbot.findElement('#{selenium_locator}');
} catch(e) {
element = null;
};
element != null;
EOF
begin
selenium.wait_for_condition(expression, timeout)
rescue ::Selenium::SeleniumException
raise "Couldn't find element with locator '#{locator}' on the page: #{$!}.\nThe locator passed to selenium was '#{selenium_locator}'"
end
end
end
the wrapper also did other things, like allowing to search by the button/input label etc. (so the wrapper didn't only exist for the timing issues, this was just one of the things we put in there.)
OTHER TIPS
Excuse my Ruby but what you need to do is try find the object and if its not there just wait for it to come back. What the code below should do is wait loop every second for a minute trying to see if the driver can find the element with the ID idOfElement
and then if it can't it should throw an error
assert !60.times{ break if (driver.find_element(:id, "idOfElement) rescue false); sleep 1 }
A separate mtd (wrapper) to check for the element with a wait should help.