我无法在html源页面Selenium中通过ID查找元素

Question

I am trying to get a list at the website , clicking on a button ('Todas'). The Todas button Id at the browser html source and my python code are:

Button Id:'ctl00_contentPlaceHolderConteudo_BuscaNomeEmpresa1_btnTodas'

    from selenium import webdriver 
    import time

    driver = webdriver.Firefox(executable_path='') 
    driver.implicitly_wait(12)
    driver.get("http://www.bmfbovespa.com.br/pt_br/produtos/listados-a-vista-e-derivativos/renda-variavel/empresas-listadas.htm") 

    driver.find_element_by_id("ctl00_contentPlaceHolderConteudo_BuscaNomeEmpresa1_btnTodas")

Error message:

NoSuchElementException: Unable to locate element: {"method":"id","selector":"ctl00_contentPlaceHolderConteudo_BuscaNomeEmpresa1_btnTodas"}

In fact, the element is present in the browser html

I read the related topics but I didn't get a solution.

So, what I need to do in order to click that button and get the data list after?

Thanks so much!

Answer 1

As I'm seeing in your provided website this TODAS button is inside an iframe with id bvmf_iframe , You need to switch that frame before finding this button as below :-

driver = webdriver.Firefox(executable_path='') 
driver.implicitly_wait(12)
driver.switch_to_frame("bvmf_iframe")
driver.get("http://www.bmfbovespa.com.br/pt_br/produtos/listados-a-vista-e-derivativos/renda-variavel/empresas-listadas.htm") 

driver.find_element_by_id("ctl00_contentPlaceHolderConteudo_BuscaNomeEmpresa1_btnTodas")

Answer 2

Reason is because this page is using an iFrame, you will need to swicth to the iframe before attempting to find your element:

iframe = driver.find_elements_by_tag_name('iframe')[0]
driver.switch_to_default_content()

driver.switch_to_frame(iframe)
driver.find_element_by_id("ctl00_contentPlaceHolderConteudo_BuscaNomeEmpresa1_btnTodas")