selenium自动化JS滚动条获取动态加载的元素

昨天的滚动条是在非动态的页面加载，但是购物网站，比如京东页面，他的元素是动态加载的，

动态加载就是页面滑动到页面的可是区域才会被加载，

一、先滑动一下，等待新元素加载出来，再寻找元素，没有则继续滚动，只到元素出现

 2、获取当前窗口的可视区域大小

 3、获取整个HTML的body高度

 4、循环判断只要整个HTML页面的高度和现在的高度是否一致，不一致就循环接着找，

from selenium import webdriver

from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait

driver = webdriver.Chrome()
driver.get('http://www.baidu.com')
driver.implicitly_wait(5)
driver.maximize_window()
# 输入京东，按回车
ele = driver.find_element_by_id('kw')
ele.send_keys("京东商城", Keys.ENTER)
# 找到京东商城，点击进入
loc = (By.XPATH, '//a[contains(text(),"正品低价、品质保障")]')
WebDriverWait(driver, 20).until(EC.visibility_of_element_located(loc))
driver.find_element(*loc).click()
# 其他换到新页面，京东
win = driver.window_handles
driver.switch_to.window(win[-1])
# 获取当前窗口的内容可视区域
inner_height = driver.execute_script("var a = window.innerHeight;return a;")
print("当前窗口的内容可视区域-高度：", inner_height)

# 获取当前整个html页面的body高度。
body_height = driver.execute_script("var a = document.body.scrollHeight;return a;")
print("当前整个html页面的body-高度:", body_height)

# 京东页面的内容 - 滚动多少，加载多少。所要操作的内容，并不知道大概要滚动多少。
# 查找的元素定位
lo = (By.XPATH, '//*[@id="J_top"]/div[1]/a/h3')

scrolled_height = 0
new_body_height = body_height  # 当前整个html页面的body高度
old_body_height = 0
break_flag = False
while new_body_height != old_body_height:
    distance = int((new_body_height - scrolled_height) / (inner_height * 0.5)) + 1
    for i in range(distance):
        # 滚动距离为 窗口内容可视区域的百分之50.可灵活配置哦！
        driver.execute_script("var a = window.innerHeight;window.scrollBy(0,a*0.5);")
        # 滚动一次，页面内容会更新一部分。在滚动之后，查找当前页面是否包含了它。如果没有，继续滚动。如果有，退出。
        try:
            WebDriverWait(driver, 10).until(EC.visibility_of_element_located(lo))
        except:
            pass
        else:
            print("找到啦！！！")
            driver.find_element(*lo).click()
            break_flag = True  # 终止for循环
            break
    if break_flag is True:  # 终止While循环
        break
        # time.sleep(3)
    # 更新滚动
    old_body_height = new_body_height
    scrolled_height = new_body_height
    new_body_height = driver.execute_script("var a = document.body.scrollHeight;return a;")
    print("老 - 当前整个html页面的body-高度:", old_body_height)
    print("新 - 当前整个html页面的body-高度:", new_body_height)

简易版 ：搬运  动态加载元素可以这样获取

from selenium import webdriver

from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait

driver = webdriver.Chrome()
driver.get('http://www.baidu.com')
driver.implicitly_wait(5)
driver.maximize_window()
ele = driver.find_element_by_id('kw')
ele.send_keys("京东商城", Keys.ENTER)
loc = (By.XPATH, '//a[contains(text(),"正品低价、品质保障")]')
WebDriverWait(driver, 20).until(EC.visibility_of_element_located(loc))
driver.find_element(*loc).click()
win = driver.window_handles
driver.switch_to.window(win[-1])
lo = (By.XPATH, '//h3[text()="逛好店"]')

while True:
    js = """
            var a = window.innerHeight;
            window.scrollBy(0, a*0.5);
    """
    driver.execute_script(js)
    try:
        WebDriverWait(driver, 3, 0.5).until(EC.visibility_of_element_located(lo))
        driver.find_element(*lo).click()
    except:
        pass
    else:
        break