This is a working Java version of the example you gave :
void waitForLoad(WebDriver driver) {
new WebDriverWait(driver, 30).until((ExpectedCondition<Boolean>) wd ->
((JavascriptExecutor) wd).executeScript("return document.readyState").equals("complete"));
}
Example For c#:
public static void WaitForLoad(IWebDriver driver, int timeoutSec = 15)
{
IJavaScriptExecutor js = (IJavaScriptExecutor)driver;
WebDriverWait wait = new WebDriverWait(driver, new TimeSpan(0, 0, timeoutSec));
wait.Until(wd => js.ExecuteScript("return document.readyState").ToString() == "complete");
}
Example for PHP:
final public function waitUntilDomReadyState(RemoteWebDriver $webDriver): void
{
$webDriver->wait()->until(function () {
return $webDriver->executeScript('return document.readyState') === 'complete';
});
}