JavaScriptException in execute_script method

Question

def send(self, message):
    try:
        textArea = self.driver.find_element_by_xpath("//textarea[@placeholder='Message...']")
        textArea.clear()
        self.driver.execute_script("arguments[0].value='" + message + "'", textArea) # Error right here
        textArea.send_keys(Keys.SPACE)
        sendButton = self.driver.find_element_by_xpath("//button[contains(text(), 'Send')]").click()

    except NoSuchElementException or StaleElementReferenceException as ex:
        print("Исключение в send()")
        print(ex)

Up to this point, the fifth line worked, but now I just can’t figure out what the problem is. And the variables have correct values.

File "D:\PROJECTS\BLD_Project\main.py", line 187, in send
    self.driver.execute_script("arguments[0].value='" + message + "'", textArea)
  File "D:\PROJECTS\INST\venv\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 878, in execute_script
    return self.execute(command, {
  File "D:\PROJECTS\INST\venv\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 424, in execute
    self.error_handler.check_response(response)
  File "D:\PROJECTS\INST\venv\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 247, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.JavascriptException: Message: javascript error: Unexpected identifier

Does message happen to contain quotes, newlines or other "special" characters? — Thomas
– Thomas, Commented Jan 26, 2022 at 13:01
@Thomas can you provide a list of special characters? It looks like you are right. — Дмитрий Гуща
– Дмитрий Гуща, Commented Jan 26, 2022 at 13:08

Thomas · Accepted Answer · 2022-01-27 07:44:49Z

2

You seem to be running into escaping troubles. If message contains a quote character, for example O'Hara, you'd end up with a syntax error in the executed JavaScript code:

arguments[0].value='O'Hara'

The solution is to use the arguments array that you're already using, to pass the message string as well:

self.driver.execute_script("arguments[0].value = arguments[1]", textArea, message)

answered Jan 27, 2022 at 7:44

Thomas

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3 Comments

cruisepandey Over a year ago

it's difficult for me to understand this behavior, where exactly did I go wrong ?

cruisepandey Over a year ago

moreover, I run the code that I have given, with multiple combination of special characters and it did work on those occasions as well.

Thomas Over a year ago

Do you understand why arguments[0].value='O'Hara' is a problem?

cruisepandey · Accepted Answer · 2022-01-27 10:01:04Z

-1

Assuming message is a string, you can use setAttribute inside execute_script like below:

textArea = self.driver.find_element_by_xpath("//textarea[@placeholder='Message...']")
self.driver.execute_script(f"arguments[0].setAttribute('value', '{message}')", textArea)

to pass message variable into textArea web element.

Update:

edited Jan 27, 2022 at 10:01

answered Jan 26, 2022 at 13:05

cruisepandey

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9 Comments

Thomas Over a year ago

It does not address the problem. If the original code gives a syntax error, so will this one.

cruisepandey Over a year ago

@Thomas: I don't see any syntax error, I made a sample.html file with an input tag and could update the input field with my selenium script having execute_script, whatever I have mentioned above. It did work and did not throw any syntax error.

Thomas Over a year ago

If you didn't see any syntax error, you were failing to reproduce OP's issue in the first place. Read the question again. What happened if you set message = "O'Hara" in your Python code?

cruisepandey Over a year ago

@Thomas: See by yourself, updated with screenshot.

cruisepandey Over a year ago

he had problem at this line self.driver.execute_script("arguments[0].value='" + message + "'", textArea) # Error right here and I could resolve this, I am not here to make you agree on this, but I don't see anyway you should downvote this answer. Cause this actually works.

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