CODEWITHSUNDEEP
pythonseleniumwebdriver
Gengar
Gengar

Reputation: 133

Selenium Webdriver - NoSuchElementExceptions

I am using the python unit testing library (unittest) with selenium webdriver. I am trying to find an element by it's name. About half of the time, the tests throw a NoSuchElementException and the other time it does not throw the exception.

I was wondering if it had to do with the selenium webdriver not waiting long enough for the page to load.

Upvotes: 4

Views: 9587

Answers (7)

Venkatesh Yalavatthi
Venkatesh Yalavatthi

Reputation: 11

I feel it might be synchronisation issue (i.e webdriver speed and application speed is mismatch )

Use Implicit wait:

driver.manage.timeouts.implicitlyWait(9000  TIMEUNITS.miliseconds)

Reference

Upvotes: 0

Kermit_ice_tea
Kermit_ice_tea

Reputation: 518

You need to have a waitUntil (your element loads). If you are sure that your element will eventually appear on the page, this will ensure that what ever validations will only occur after your expected element is loaded.

Upvotes: 0

pritam.jec58
pritam.jec58

Reputation: 1

To resolve this query you have to define explicit wait. so that till the time when page is loading it will not search any WebElement. below url help on this. http://docs.seleniumhq.org/docs/04_webdriver_advanced.jsp

Upvotes: 0

user2388556
user2388556

Reputation: 299

I put my money on frame as I had similar issue before :)

Check your html again and check if you are dealing with frame. If it is then switching to correct frame will be able to locate the element.

Python

driver.switch_to_frame("frameName")

Then search for element.

If not, try put wait time as others suggested.

Upvotes: 3

TehTris
TehTris

Reputation: 3207

driver = webdriver.WhatEverBrowser()
driver.implicitly_wait(60) # This line will cause it to search for 60 seconds

it only needs to be inserted in your code once ( i usually do it right after creating webdriver object)

for example if your page for some reason takes 30 seconds to load ( buy a new server), and the element is one of the last things to show up on the page, it pretty much just keeps checking over and over and over again if the element is there for 60 seconds, THEN if it doesnt find it, it throws the exception.

also make sure your scope is correct, ie: if you are focused on a frame, and the element you are looking for is NOT in that frame, it will NOT find it.

Upvotes: 12

qwwqwwq
qwwqwwq

Reputation: 7309

One way to handle waiting for an element to appear is like this:

import selenium.webdriver.support.ui as ui
wait = ui.WebDriverWait(driver,10)
wait.until(lambda driver: driver.find_by_name('some_name') )
elem = driver.find_by_name('some_name')

You are correct that the webdriver is not waiting for the page to load, there is no built-in default wait for driver.get().

Upvotes: 1

eran
eran

Reputation: 15136

I see that too. What I do is just wait it out...

you could try:

while True:
    try:
        x = driver.find_by_name('some_name')
        break
    except NoSuchElementException:
        time.sleep(1)
        # possibly use driver.get() again if needed

Also, try updating your selenium to the newest version with pip install --update selenium

Upvotes: 5

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