Mastering the proper utilization of document.readyState in conjunction with Selenium

I am exploring a method to automatically scroll down a page that loads content dynamically as it is scrolled, ensuring everything is loaded before interacting with it using Selenium.

I came across this code originally written for c#, which I have converted to Java. Although the code compiles and runs, it seems to get stuck in an endless loop even after the page has fully loaded

        Boolean readyStateComplete = false;
        while (!readyStateComplete)
        {
            JavascriptExecutor executor = (JavascriptExecutor) driver;
            executor.executeScript("window.scrollTo(0, document.body.offsetHeight)");
            readyStateComplete = (String) executor.executeScript("return document.readyState") == "complete";
        }

As I am not very familiar with JavaScript, can someone help me identify what might be causing this issue?

javascriptjavaselenium

Answer №1

Instead of using ==, it is recommended to opt for the .equals() method.

readyStateComplete = ((String) executor.executeScript("return document.readyState")).equals("complete");

The == operator checks for reference equality (whether they are the same object).

On the other hand, the .equals() method tests for value equality (if they are logically "equal").

Answer №2

An efficient method for scrolling down a webpage and waiting for the content to load involves utilizing the executeAsyncScript function to monitor changes in scroll height and page readiness:

WebDriver browser = new ChromeDriver();
browser.manage().timeouts().setScriptTimeout(20, TimeUnit.SECONDS);
JavascriptExecutor jsExecutor = (JavascriptExecutor)browser;

browser.get("http://imgur.com/");

final String JS_SCROLL_DOWN =
    "var callback = arguments[0], page = document.documentElement, height = page.scrollHeight; " +
    "window.scrollTo(0, height); " +
    "(function fn(){ " +
    "   if(page.scrollHeight != height && document.readyState == 'complete') " +
    "      return callback(); " +
    "   setTimeout(fn, 30); " +
    "})();";

jsExecutor.executeAsyncScript(JS_SCROLL_DOWN);

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