`getDocHeight()` incorrectly returning viewport height for some applications

[roboaks]

I am using Chrome 79.0.3945.88 (64-bit) and Selenium WebDriver 3.141.59. When I use a public website like Google or Wikipedia the WHOLE_PAGE strategy works fine. I can see the page scrolling and the screenshot reflects that,

Using a proprietary application (Guidewire PolicyCenter, a major insurance system vendor), however, it doesn’t work. I’ve done some tracing and discovered the exact issue: com.assertthat.selenium_shutterbug.utils.web.Browser.getDocHeight() always returns the same value as com.assertthat.selenium_shutterbug.utils.web.Browser.getViewportHeight(). In short, the called JavaScript,

return Math.max(document.body.scrollHeight, document.body.offsetHeight, 
document.documentElement.clientHeight, document.documentElement.scrollHeight, 
document.documentElement.offsetHeight);

Simply returns the viewport height.

I don’t have any knowledge of the web UI framework that PolicyCenter uses and, unfortunately, I can’t provide access to PolicyCenter, as we use it over a VPN.

Have you ever seen anything like this before? Do you have any suggestions?

[glibas]

Hi @roboaks
Does the web page changes its height when scrolling? I mean if the content loads during the page scroll then worth trying scrolling to the bottom of the page first using JavaScriptExecutor and then trying to take a screenshot as shutterbug is calculating the doc height during first screenshot and so all dynamically loaded content will be ignored.

Hope that helps. Hard to tell not having access to the app, so just an assumption.

[roboaks]

I added code to scroll to the bottom of the page before taking the screenshot and it doesn't scroll the page. I tried the same code against Wikipedia and it works fine. I even put a breakpoint before the call to ShutterBug and manually scrolled the page but that made no difference. The size of the viewport and document are always calculated as the same.

The fact that a basic call to window.scrollTo doesn't work suggest to me that there is something about this app's UI framework that is non-standard.

Have you encountered other apps that behave this way?

[glibas]

Another thing might be that the content you are trying to scroll is an iframe and js is executed on the parent page do it's not affecting iframe content

[roboaks]

I will investigate that. If that is indeed the case, is there a solution?

[roboaks]

Lol: #30 was requested by Richard Morris, who is a colleague. It looks like iframe support is still pending.

[glibas]

Implemented in v1.0 e.g

Shutterbug.shootFrame(driver, driver.findElement(By.id("myFrame")),
                Capture.FULL_SCROLL).save();