Selenium: Can't find element by class name in any way-CodePudding

I have this problem where I can't access a button trough it's class name in any way I could think of. This is the HTML:

<button >
 
 <faceplate-number pretty="" number="18591"><!---->18.591</faceplate-number> weitere Kommentare anzeigen
 
 </button>

I tried to access it using:

driver.find_element(By.CLASS_NAME, "expand-button")

But the error tells me that there was no such element. I also tried X-Path and Css-Selector which both didn't appear to work.

I would be glad for any help!
Kind Regards and Thanks in advance
Eirik

CodePudding user response：

It could be because you check before the element is created in the DOM.

one way to solve this problem is by using the waites option like below

driver.implicitly_wait(10)
driver.get("http://somedomain/url_that_delays_loading")
my_dynamic_element = driver.find_element(By.ID, "myDynamicElement")

You can read more about it here: https://www.selenium.dev/documentation/webdriver/waits/#implicit-wait

Another way is by using the Fluent Wait whhich marks the maximum amount of time for Selenium WebDriver to wait for a certain condition (web element) becomes visible. It also defines how frequently WebDriver will check if the condition appears before throwing the “ElementNotVisibleException”.

#Declare and initialise a fluent wait
FluentWait wait = new FluentWait(driver);
#Specify the timout of the wait
wait.withTimeout(5000, TimeUnit.MILLISECONDS);
#Sepcify polling time
wait.pollingEvery(250, TimeUnit.MILLISECONDS);
#Specify what exceptions to ignore
wait.ignoring(NoSuchElementException.class)
#specify the condition to wait on.
wait.until(ExpectedConditions.element_to_be_selected(your_element_here));

you can also read more about that from the official documentation https://www.selenium.dev/documentation/webdriver/waits/#fluentwait