Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
476 views
in Technique[技术] by (71.8m points)

python - Selenium: retrieve data that loads while scrolling down

I'm trying to retrieve elements in a page that has an ajax-load scroll-down functionality alla Twitter. For some reason this isn't working properly. I added some print statements to debug it and I always get the same amount of items and then the function returns. What am I doing wrong here?

wd = webdriver.Firefox()
wd.implicitly_wait(3)

def get_items(items):
    print len(items)
    wd.execute_script("window.scrollTo(0, document.body.scrollHeight);")
    # len(items) and len(wd.find_elements-by...()) both always seem to return the same number
    # if I were to start the loop with while True: it would work, but of course... never end
    while len(wd.find_elements_by_class_name('stream-item')) > len(items):
        items = wd.find_elements_by_class_name('stream-item')
        print items
        wd.execute_script("window.scrollTo(0, document.body.scrollHeight);")
    return items

def test():
    get_page('http://twitter.com/')
    get_items(wd.find_elements_by_class_name('stream-item'))
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Try putting a sleep in between

wd = webdriver.Firefox()
wd.implicitly_wait(3)

def get_items(items):
    print len(items)
    wd.execute_script("window.scrollTo(0, document.body.scrollHeight);")
    # len(items) and len(wd.find_elements-by...()) both always seem to return the same number
    # if I were to start the loop with while True: it would work, but of course... never end

    sleep(5) #seconds
    while len(wd.find_elements_by_class_name('stream-item')) > len(items):
        items = wd.find_elements_by_class_name('stream-item')
        print items
        wd.execute_script("window.scrollTo(0, document.body.scrollHeight);")
    return items

def test():
    get_page('http://twitter.com/')
    get_items(wd.find_elements_by_class_name('stream-item'))

Note: The hard sleep is just for demonstrating that it works. Please use the waits package to wait for a smart condition instead.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

1.4m articles

1.4m replys

5 comments

57.0k users

...