JavascriptExecutor.executeScript() returning String does not work

[Rostislav Matl]

I wrote following code to test executeScript():

String siteUrl = "http://www.seznam.cz";
WebDriver driver = new new FirefoxDriver();

driver.get(siteUrl);
JavascriptExecutor js = (JavascriptExecutor) driver;

String scriptReturningString = "SZN.idGenerator()";
String scriptResult = (String)js.executeScript(scriptReturningString);
out.println("script result: " + scriptResult);

driver.quit();

I always get "script result: null" in output.
When I call different JS function that does not return anything, it
works.
Can you see any mistake ?

I run Selenium 2.0b1.

[bp]

Did you add a return?

such as "return SZN.idGenerator()"

[Rostislav Matl]

Yes, I found it already. (It took whole day to get my message here).
Adding 'return' works.

[Роман Анатольевич]

Could you please help me with:

public static String runJS(String jsComman) {

JavascriptExecutor js;

   js = (JavascriptExecutor)driver;

   String scriptReturningString = jsComman; 

   String scriptResult = (String)js.executeScript(scriptReturningString); 

return "rez: " + scriptResult;

}

What I did wrong?

The return string is always is: rez: null

Thnaks

понедельник, 7 марта 2011 г., 18:37:56 UTC+2 пользователь Rostislav Matl написал:

[Krishnan Mahadevan]

Make sure your JS begins with "return". 

For e., 

String userAgent = runJS("return navigator.userAgent ;");

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Thanks & Regards
Krishnan Mahadevan

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