selenium.common.exceptions.WebDriverException: Message: unknown error: 'script' must be a string while using execute_script() through Selenium Python

Question

I\'ve got an issue with browser.execute_script while using selenium with python. There is an element that i\'d like to click (it\'s xpath below)

\"//*[@id=\'lis         


        

Answer 1

This error message...

selenium.common.exceptions.WebDriverException: Message: unknown error: 'script' must be a string

...implies that the method execute_script() was invoked with wrong type of parameters.

The execute_script() method is defined as:

execute_script(script, *args)
    Synchronously Executes JavaScript in the current window/frame.

Where:
    script: The JavaScript to execute
    *args: Any applicable arguments for your JavaScript.

In your code trial executeScript() method will take the reference of the element as arguments[0] along with the method to be performed (in this case click()) and the reference should be provided thereafter. So @Andersson's solution should have worked.

navMenu = browser.find_element_by_xpath("//*[@id='listFav_FI410_23244709400000_FAGNNURROR_IPOF_APP_P43070_W43070A_CP000A001_40']/table/tbody/tr/td[1]")
browser.execute_script("arguments[0].click()", navMenu)

You can find a detailed discussion in What does argument [0] and argument [1] mean in javascriptexecutor in Selenium WebDriver?

---

The hint to your main issue is the error element not visible which implies either of the following cases:

• You are trying to invoke click() even before the element is visible/clickable
• Element is not within the Viewport when click() was invoked.

Solution

Two pottential solutions will be as follows:

• Induce WebDriverWait for the element to be clickable as follows:

  from selenium.webdriver.support.ui import WebDriverWait
  from selenium.webdriver.common.by import By
  from selenium.webdriver.support import expected_conditions as EC
  # other lines of code
  WebDriverWait(driver, 20).until(EC.element_to_be_clickable((By.XPATH, "//*[@id='listFav_FI410_23244709400000_FAGNNURROR_IPOF_APP_P43070_W43070A_CP000A001_40']/table/tbody/tr/td[1]"))).click()
  

• Use executeScript() method to bring the element within the Viewport and then invoke click() as follows:

  navMenu = browser.find_element_by_xpath("//*[@id='listFav_FI410_23244709400000_FAGNNURROR_IPOF_APP_P43070_W43070A_CP000A001_40']/table/tbody/tr/td[1]")
  browser.execute_script("arguments[0].scrollIntoView(true);",navMenu);
  navMenu.click()