python - Selenium 等待元素

Question

如何为 Selenium 编写函数来等待 Python 中只有一个类标识符的表？我在学习使用 Selenium 的 Python webdriver 函数时遇到了麻烦。

Answer 1

来自 Selenium Documentation PDF :

import contextlib
import selenium.webdriver as webdriver
import selenium.webdriver.support.ui as ui

with contextlib.closing(webdriver.Firefox()) as driver:
    driver.get('http://www.google.com')
    wait = ui.WebDriverWait(driver,10)
    # Do not call `implicitly_wait` if using `WebDriverWait`.
    #     It magnifies the timeout.
    # driver.implicitly_wait(10)  
    inputElement=driver.find_element_by_name('q')
    inputElement.send_keys('Cheese!')
    inputElement.submit()
    print(driver.title)

    wait.until(lambda driver: driver.title.lower().startswith('cheese!'))
    print(driver.title)

    # This raises
    #     selenium.common.exceptions.TimeoutException: Message: None
    #     after 10 seconds
    wait.until(lambda driver: driver.find_element_by_id('someId'))
    print(driver.title)