selenium execute_script with newlines

Question

I'm using selenium and Python and I am trying to execute a JS function that takes in a string like so:

browser.execute_script("foo('someString')")

This works when someString does not have any newlines. When there is a newline character the following happens:

\n     => Parse Error
\\n    => Newline is converted to a space
\r\n   => Parse Error
\\r\\n => Both characters are converted to a space

Is there a way to do this?

falsetru · Accepted Answer · 2015-01-17 10:32:51Z

5

You can pass arguments to the javascript; those additional arguments are accessible using arguments:

browser.execute_script("foo(arguments[0])", 'someString')
browser.execute_script("foo(arguments[0])", 'string with \n is also ok!\n')

answered Jan 17, 2015 at 10:32

falsetru

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6 Comments

InsightClip Over a year ago

Thanks for the quick reply. I don't get a parse error anymore but the newlines are being removed alltogether. So the string "hello\nworld" becomes "helloworld".

falsetru Over a year ago

@MinaHany, How do you confirm that newlines are gone? Could you try this: browser.execute_script("console.log(arguments[0])", 'hello\n newline')

falsetru Over a year ago

@MinaHany, If the foo write the string to html, you may need to convert newlines something like <br>: browser.execute_script("foo(arguments[0])", 'hello\n newline\n'.replace('<br>'))

InsightClip Over a year ago

You were right, the problem was not selenium. There was a function 3 levels down from foo() that removes the newline. Thanks for pointing me in the correct direction! However to solve my problem I need to somehow override the function that removes the newline (I know its name). Is it possible to do that in selenium before executing the foo function?

falsetru Over a year ago

@MinaHany, Could you post a separate question with the content of the functions? Without seeing it I can't answer.

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Sreekant Shenoy · Accepted Answer · 2020-07-03 08:30:54Z

1

The easy solution is to convert \n to unicode \u000a.

similar example:

driver.execute_script("document.getElementById('website_name').value='hello1\u000ahello2'")

answered Jul 3, 2020 at 8:30

Sreekant Shenoy

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