JavascriptExecutor in Selenium Webdriver Java

Question

Just wanted to ask a simple question. I'm learning a bit about testing and once again I have a little problem.

In my code I want to call a method that will use JavascriptExecutor.

I write:

JavascriptExecutor js = (JavascriptExecutor)driver

And after that I use it in method:

public void clickSearch()
{ js.executeScript("arguments[0].click()", sOmEtHiNg);}

But then, when I start my code I get : Null Pointer Exception.

But... when I simply use JavascriptExecutor in my method For example:

public void clickSearch()
{ ((JavascriptExecutor)driver).executeScript("arguments[0].click()",eight); }

Then everything is ok and I get no errors.

Someone could please tell me where I make a mistake that causes Null Pointer Exception ?

Thanks a lot :-)

CEH · Accepted Answer · 2019-09-26 19:17:35Z

1

public void clickSearch()
{ js.executeScript("arguments[0].click()", sOmEtHiNg);}

It looks like js could be null here, which would throw the exception. We need to ensure js is inside the scope for your clickSearch() method. Could you try this instead:

public void clickSearch()
{
    JavascriptExecutor js = (JavascriptExecutor)driver 
    js.executeScript("arguments[0].click()", sOmEtHiNg);
}

Or possibly:

JavascriptExecutor js = (JavascriptExecutor)driver;
clickSearch(js);

public void clickSearch(JavascriptExecutor js)
{
    js.executeScript("arguments[0].click()", sOmEtHiNg);
}

answered Sep 26, 2019 at 19:17

CEH

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blofeld · Accepted Answer · 2019-09-26 19:42:02Z

0

public void clickSearch()
{
    JavascriptExecutor js = (JavascriptExecutor)driver 
    js.executeScript("arguments[0].click()", sOmEtHiNg);
}

This one works. Second one can not be used becouse of the different classes. I write it on one and run on another :-) Thanks a lot again :-)

answered Sep 26, 2019 at 19:42

blofeld

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