Python Selenium无法找到用户名元素

Question

I am trying to create an automated login system for my local library website ( http://mcls.ent.sirsi.net/client/en_US/mclweb ) using Python and Selenium. However, my script is unable to find the username box.

The HTML from the website for the username box looks like this

<input maxlength="30" class="user_name_input" id="j_username" name="j_username" type="text">

and this is the code I used to find it

username = browser.find_element_by_id('j_username')
username.send_keys(u)

however, I am getting the following error:

selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"id","selector":"j_username"}

Am I supposed to use a different function? Or did I use find_element_by_id() wrong? Thanks in advance.

Answer 1

U can also login to that site without using iframe

 browser.get("http://mcls.ent.sirsi.net/client/en_US/login") browser.find_element_by_id('j_username').send_keys(u) 

Answer 2

The login form lies on a frame. You have to switch to the frame.

browser.get("http://mcls.ent.sirsi.net/client/en_US/mclweb")
browser.find_element_by_class_name('loginLink').click()
time.sleep(5)
browser.switch_to.frame(1) //login iframe is the second frame in the page
time.sleep(5)
browser.find_element_by_id('j_username').send_keys(u)

Alternative way, in case you want to do without switching to frame:

browser.get("http://mcls.ent.sirsi.net/client/en_US/mclweb/search/patronlogin")
browser.find_element_by_id('j_username').send_keys(u)