Can you tell me the distinction between using RemoteWebDriver's executeScript() and Selenium's getEval() for executing

Can you explain the distinction between these two pieces of code:

RemoteWebDriver driver = new FirefoxDriver();
Object result = driver.executeScript("somefunction();");

and this:

RemoteWebDriver driver = new FirefoxDriver();
Selenium seleniumDriver = new WebDriverBackedSelenium(driver, driver.getCurrentUrl());
String result = seleniumDriver.getEval("somefunction();");

I have noticed that one command works in certain situations while the other causes Firefox to hang. I am curious about what sets these functions apart and why they yield different results.

javajavascriptseleniumwebdriverselenium-webdriver

Answer №1

If you're looking for more information, I recommend checking out the Selenium Webdriver Documentation where you'll find everything you need to know.
In particular, make sure to check out the section on How Does WebDriver ‘Drive’ the Browser Compared to Selenium-RC ?

Answer №2

When running the provided script fragment, it will run within an anonymous function.

 ((JavascriptExecutor)driver).executeScript("somefunction();");

This essentially injects a similar code snippet into the document:

return function()
{ 
   somefunction(); 
}.call();

Therefore, on webdriver, executeScript runs synchronously and has the potential to block.

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