Python 3.5 - Selenium - How To Handle A New Window And Wait Until It Is Fully Loaded?

I am doing browser automation and I am blocked at a certain point: at a moment, I ask the browser to click on a button, which in turn open up a new window. But sometimes the Intern

Solution 1:

You can try to use following code to wait until new window appears:

WebDriverWait(driver, 20).until(EC.number_of_windows_to_be(2))

Your code should looks like

Button.click()

WebDriverWait(driver, 20).until(EC.number_of_windows_to_be(2))

newWindow = driver.window_handles
newNewWindow = newWindow[1]
driver.switch_to.window(newNewWindow)

Considering @JimEvans comment, try below:

current = driver.window_handles[0]
Button.click()

WebDriverWait(driver, 20).until(EC.number_of_windows_to_be(2))

newWindow = [window for window in driver.window_handles if window != current][0]
driver.switch_to.window(newWindow)

Solution 2:

What I'm using:

windows = set(driver.window_handles)
driver.execute_script("window.open()")
WebDriverWait(driver, 20).until(EC.new_window_is_opened(windows))
hwnd = list(set(driver.window_handles) - windows)[0]

You can create a function or a context manager like this answer for it if you find it necessary, but for essentially 3 lines (not counting the one that actually opens the window, which may be very different for each case), I prefer to just copy-paste.

To be thorough, here's a feature-enriched alternative:

@contextmanager
def wait_for_new_window(driver, timeout=10, switch=True):
    """Waits for a new window to open

    Parameters:
        driver: WebDriver.
            Selenium WebDriver object.
        timeout: int
            Maximum waiting time
        switch: bool
            If `True` (default), switches to the window.


    Exemplo:
        >>> with wait_for_new_window(driver) as hwnds:
        ...     driver.execute_script("window.open()");
        ... print("Window opened:", hwnds[0])
    """
    windows = set(driver.window_handles)
    handle = []
    yield handle
    WebDriverWait(driver, timeout).until(EC.new_window_is_opened(windows))
    hwnds = list(set(driver.window_handles) - windows)
    handle.extend(hwnds)
    if switch:
        driver.switch_to.window(hwnds[0])

Solution 3:

The exact answer for waiting a NEW window to be fully loaded is:

using url_changes from expected_conditions with the old URL parameter as "about:blank" :

WebDriverWait(Driver, 15).until(EC.url_changes("about:blank"))

A sample code might look like:

        ...
        # Wait till a new window opened (2nd window in this example)
        WebDriverWait(Driver, 15).until(EC.number_of_windows_to_be(2))

        # Switch to second window
        window_after = Driver.window_handles[1]
        Driver.switch_to.window(window_after)

        # Wait till **new window fully loaded**:
        WebDriverWait(Driver, 15).until(EC.url_changes("about:blank"))
        ...