練習題：非同步行為

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

顯式等待

• https://demoqa.com/dynamic-properties
• 會用到的語法
  • WebDriverWait
    • until
  • expected_conditions element_to_be_clickable

解答

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.Chrome("./chromedriver")
driver.get("https://demoqa.com/dynamic-properties")
assert "ToolsQA" in driver.title

try:
    element = WebDriverWait(driver, 10).until(
        EC.element_to_be_clickable((By.ID, "enableAfter"))
    )
finally:
    driver.quit()

隱式等待

• https://demoqa.com/dynamic-properties
• 會用到的語法
  • implicitly_wait(time_to_wait)

解答

from selenium import webdriver

driver = webdriver.Chrome("./chromedriver")
driver.implicitly_wait(5) # 單位是秒
driver.get("https://demoqa.com/dynamic-properties")
assert "ToolsQA" in driver.title
try:
    element = driver.find_element_by_id("visibleAfter")
    print(element.text)
finally:
    driver.quit()