如何通过Selenium和WebDriver等待JavaScript __doPostBack调用

我发现，处理这些JS最简单的方法

postbacks

这是一个示例函数：

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

然后，我将选择一个受此影响的元素，

postback load

如：

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")

我不知道这是否是处理Javascript 事件的 最佳 方法

onchange load

为了补充这个答案 ：我发现在有多个加载事件时， 等到元素变旧
并不总是有效，我发现使用该方法以及下面的代码可以更有效地确保这些动态加载事件已完成：（我改编了
HERE的以下代码）

# Wait for AJAX (Jquery or JS) dynamic page load eventsclass 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 LoadCompletedef 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 completedWaitForDynamicLoad(driver, Counts.WaitTime)

希望这有助于防止

time.sleep()