selenium 頁面等待

需要等待的原因

如果網頁使用了Ajax異步請求, 當瀏覽器加載頁面時, 各種元素的加載時間不同, 定位元素可能會因爲響應時間問題出現定位不到的異常: ElementNotVisibleException .
使用 waits , 解決元素等待加載的問題.

顯式等待

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

driver = webdriver.Firefox()
driver.get("http://www.baidu.com")
try:
    element = WebDriverWait(driver, 10).until(
        EC.presence_of_element_located((By.ID, "kw"))
    )
finally:
    driver.quit()

from selenium.webdriver.support import expected_conditions as EC

wait = WebDriverWait(driver, 10)
element = wait.until(EC.element_to_be_clickable((By.ID,'kw')))

隱式等待

from selenium import webdriver

driver = webdriver.Firefox()
driver.implicitly_wait(10) # seconds
driver.get("https://www.baidu.com")
myDynamicElement = driver.find_element_by_id("myDynamicElement")