I'm moving some tests from Selenium to the WebDriver. My problem is that I can't find an equivalent for selenium.wait_for_condition. Do the Python bindings have this at the moment, or is it still planned?
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3 Answers
Currently it isn't possible to use wait_for_condition with WebDriver. The python selenium code does provide the DrivenSelenium class for accessing the old selenium methods, but it can't do wait_for_condition. The selenium wiki has some info on that.
Your best bet is to use the WebDriverWait class. This is a helper class that periodically executes a function waiting for it to return True. My general usage is
driver = webdriver.Firefox()
driver.get('http://example.com')
add = driver.find_element_by_id("ajax_button")
add.click()
source = driver.page_source
def compare_source(driver):
try:
return source != driver.page_source
except WebDriverException:
pass
WebDriverWait(driver, 5).until(compare_source)
# and now do some assertions
This solution is by no means ideal.. The try/except is necessary for situations where the page request/response cycle is delayed waiting for some ajax activity to complete. If compare_source get's called in the midst of the request/response cycle it'll throw a WebDriverException.
The test coverage for WebDriverWait is also helpful to look at.
1 Comment
huggie
It seems like you can test visiblity.
from selenium.webdriver.support import expected_conditions as ec and then ec.visibility_of(elm). The return object of that is selenium.webdriver.support.expected_conditions.visibility_of but I haven't figured out how to get the visibility out of it.Here's my version of Greg Sadetsky's answer, put into a function:
def click_n_wait(driver, button, timeout=5):
source = driver.page_source
button.click()
def compare_source(driver):
try:
return source != driver.page_source
except WebDriverException:
pass
WebDriverWait(driver, timeout).until(compare_source)
It clicks the button, waits for the DOM to change and then returns.
Comments
The Java binding include a Wait class. This class repeatedly checks for a condition (with sleeps between) until a timeout is reached. If you can detect the completion of your Javascript using the normal API, you can take the same approach.