How to use find_element_by_link_text() properly to not raise NoSuchElementException?_问答_开发者

I have a HTML code like this:

<div class="links nopreview"><span><a class="csiAction"
href="/WebAccess/home.html#URL=centric://REFLECTION/INSTANCE/_CS_Data/null">Home</a></span>&nbsp;•&nbsp;<span><span><a class="csiAction"
href="/WebAccess/home.html#URL=centric://SITEAD开发者_运维技巧MIN/_CS_Site">Setup</a></span>&nbsp;•&nbsp;</span><span><a
title="Sign Out" class="csiAction csiActionLink">Sign Out</a></span></div>

I would like to click on the link that has the text Home. As this Home link appears after login, I have a code like this:

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
import re

browser = webdriver.Firefox() # Get local session of firefox
browser.get("http://myServer/WebAccess/login.html") # Load App page
elem = browser.find_element_by_name("LoginID") # Find the Login box
elem.send_keys("Administrator")
elem = browser.find_element_by_name("Password") # Find the Password box
elem.send_keys("Administrator" + Keys.RETURN)
#try:
elem = browser.find_element_by_link_text("Home")
elem.click()

The part till login works great. However the last but one line is problematic

elem = browser.find_element_by_link_text("Home")

It raises this NoSuchElementException where the Home link is there as you can see from the HTML code.

raise exception_class(message, screen, stacktrace)
NoSuchElementException: Message: u'Unable to locate element: {"method":"link text","selector":"Home"}'

Any guidance as to what I am doing wrong, please?

Have you tried adding an implicit wait to this so that it waits instead of running to quickly.

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
import re

browser = webdriver.Firefox() # Get local session of firefox

browser.implicitly_wait(10) #wait 10 seconds when doing a find_element before carrying on

browser.get("http://myServer/WebAccess/login.html") # Load App page
elem = browser.find_element_by_name("LoginID") # Find the Login box
elem.send_keys("Administrator")
elem = browser.find_element_by_name("Password") # Find the Password box
elem.send_keys("Administrator" + Keys.RETURN)
#try:
elem = browser.find_element_by_link_text("Home")
elem.click()

The implicitly_wait call makes the browser poll until the item is on the page and visible to be interacted with.

The most common issues with NoSuchElementException while the element is there are:

the element is in different window/frame, so you've to switch to it first,
your page is not loaded or your method of page load is not reliable.

Solution could include:

check if you're using the right frame/window by: driver.window_handles,
write a wait wrapper to wait for an element to appear,
try XPath instead, like: driver.find_element_by_xpath(u'//a[text()="Foo"]').click(),
use pdb to diagnose your problem more efficiently.

See also: How to find_element_by_link_text while having: NoSuchElement Exception?

Maybe the element you are looking for doesn't exactly match that text string? I know it can be tricky if it looks like it does on-screen, but sometimes there are oddities embedded like this simple markup "Home" or "Home" which makes the first char italic:

"<i>H</i>ome" is visually identical to "<em>H</em>ome" but does not match text.

Edit: after writing the above answer, I studied the question closer and discovered the HTML sample does show "Home" in plain text, but was not visible due to long lines not wrapping. So I edited the OP to wrap the line for readability.

New observation: I noticed that the Logout element has a "title" attribute, but the Home link element lacks such--try giving it one and using that.

Try adding an implicit wait to this in order to wait, instead of running too quickly. Or else you can import time and use time.sleep(25)