Using Selenium WebDriver JavascriptExecutor to manipulate one JS variable in separate scripts

Question

I need to reach the following scenario:

1) Initializing JS var with JavascriptExecutor that will indicate if some operation is done.

2) Do some ordinary manipulation with the renderer page.

3) Verify the change to the var created in point (1).

For example:

jsc.executeScript("var test = false;");

Now, some manipulation is done. And then:

String testVal = jsc.executeScript("return test;").toString

I get the error:

org.openqa.selenium.WebDriverException: {"errorMessage":"Can't find variable: test","request":{"headers":{"Accept":"application/json, image/png","Connection":"Keep-Alive","Content-Length":"35","Content-Type":"application/json; charset=utf-8","Host":"localhost:14025"},"httpVersion":"1.1","method":"POST","post":"{\"args\":[],\"script\":\"return test;\"}","url":"/execute","urlParsed":{"anchor":"","query":"","file":"execute","directory":"/","path":"/execute","relative":"/execute","port":"","host":"","password":"","user":"","userInfo":"","authority":"","protocol":"","source":"/execute","queryKey":{},"chunks":["execute"]},"urlOriginal":"/session/7e2c8ab0-b781-11e4-8a54-6115c321d700/execute"}}

When i'm running them in the same execution, it works correctly.:

   String testVal = jsc.executeScript("var test = false; return test;").toString;

From JavascriptExecutor doc i found the explanation i needed:

Within the script, use document to refer to the current document. Note that local variables will not be available once the script has finished executing, though global variables will persist.

What is my alternative/workaround to this?

possible duplicate of The browser console doesn't recognize js vars that were injected with selenium webdriver — Louis
– Louis, Commented Feb 18, 2015 at 17:23

Community · Accepted Answer · 2017-05-23 11:43:39Z

3

Not sure what is the motivation behind it, but you can use a globally available window object:

jsc.executeScript("window.test = false;");
String testVal = jsc.executeScript("return window.test;").toString

It might also be a use case for executeAsyncSript(), see:

Understanding execute async script in Selenium

edited May 23, 2017 at 11:43

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answered Feb 18, 2015 at 15:50

alecxe

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2 Comments

Saifur Over a year ago

@alecxe So, window.test = false; registers test variable against current driver?

alecxe Over a year ago

@Saifur I think it is in the "scope" of the current browser window - hence, basically, you can say that it in the scope of the current webdriver session.

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