I have found, the easiest way to deal with these JS postbacks
, is to wait for the element that is affected by the load to go stale or not be found.
Here is an example function:
def waitForElementRemoved(Element, WaitCount, WaitTime):
ElementRemoved = False
WaitTry = 0
while not ElementRemoved:
try:
if WaitTry > WaitCount:
raise Exception("Element not removed from page in alloted time")
Test = Element.text
WaitTry += 1
time.sleep(WaitTime)
except (NoSuchElementException, StaleElementReferenceException):
ElementRemoved = True
And then I would pick an element that is affected by this postback load
and pass it to the function along with some timing arguments.
such as:
driver = webdriver.Firefox()
driver.get("https://www.avis.co.in")
removedElement = driver.find_element_by_id("DrpCity")
mySelect = Select(driver.find_element_by_id("DrpCity"))
mySelect.select_by_visible_text("Pune")
waitForElementRemoved(removedElement, 10, .5)
WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.XPATH, "//input[@id='txtPickUp']"))).send_keys("XYZ")
I don't know if this is the best way to deal with JavaScript onchange load
events, but in my case, it has been very effective.
To add on to this answer: I have found that waiting until element goes stale does not always work when there are multiple load events, I have found that using that method along with using the below code works much more effectively to make sure these dynamic load events are complete: (I adapted the below code from HERE)
# Wait for AJAX (Jquery or JS) dynamic page load events
class DynamicLoadState:
def __call__(self, driver):
LoadComplete = False
JQueryLoadComplete = False
JSLoadComplete = False
try:
if driver.execute_script("return jQuery.active") == 0: JQueryLoadComplete = True
except Exception:
# JQuery is not present on page
JQueryLoadComplete = True
if driver.execute_script("return document.readyState") == 'complete': JSLoadComplete = True
if JQueryLoadComplete and JSLoadComplete: LoadComplete = True
return LoadComplete
def WaitForDynamicLoad(driver, WaitTime):
WebDriverWait(driver, WaitTime).until(DynamicLoadState())
# Use the first method of waiting for the element to go stale
# then run this to make sure all loading is completed
WaitForDynamicLoad(driver, Counts.WaitTime)
Hope this helps keep someone from using time.sleep()
in the future for page load!
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