In Java, the output of jsExecuteScript returns null, whereas in the browser console, it returns a String value

While running a script in the console of the browser on the aforementioned page, I encountered the following:

document.querySelector('.subscribe_form input').value

The placeholder value displayed was "Enter your email address."

However, when attempting to execute this in Java by navigating to the page and using the following code:

JavascriptExecutor js = (JavascriptExecutor)driver;
String emailPlaceholder = String.valueOf(js.executeScript("document.querySelector('.subscribe_form input').value"));

I consistently receive 'null' or NullPointerException as the outcome, even if I try .toString() or casting to (String).

NullPointerException

Do you have any insights into what might be going wrong? Or why this script is not functioning as expected in Java with Selenium?

javascriptjavaseleniumselenium-webdriver

Answer №1

To include a return in the javascript statement, use the following code:

js.executeScript("return document.querySelector('.subscribe_form input').value")
                  ^^^^^^

https://www.selenium.dev/selenium/docs/api/java/org/openqa/selenium/JavascriptExecutor.html

If the script contains a return statement, it will have a return value and trigger certain steps...

When using the browser console, the return value is implicitly displayed for human readability. However, the Selenium JavaScript executor requires an explicit return statement to retrieve values from scripts.

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