mango mango - 4 months ago 147
Ruby Question

selenium scroll element into (center of) view

When an element is out of view with selenium and one tries to interact with it, selenium will usually scroll the element into view first implicitly. This is great except that what is annoying is that it usually puts in the element just enough into view. What I mean is that if the element is below the window, it will scroll down enough just till when the element is just bordering the edge of the window.

Usually this is fine, but when working on a web site with borders around it, this will lead to numerous of these kinds of errors

Selenium::WebDriver::Error::UnknownError:
unknown error: Element is not clickable at point (438, 747). Other element would receive the click: <body>...</body>


Because usually the border of the web page is over it, but will try to click the element anyway. Is there anyway handle this? perhaps to automatically move elements to the center of the screen when out of view? I am thinking along the lines monkey-patching via ruby.

Answer

This should work in order to scroll element into center of view:

WebElement element = driver.findElement(By.xxx("xxxx"));

String scrollElementIntoMiddle = "var viewPortHeight = Math.max(document.documentElement.clientHeight, window.innerHeight || 0);"
                                            + "var elementTop = arguments[0].getBoundingClientRect().top;"
                                            + "window.scrollBy(0, elementTop-(viewPortHeight/2));";

((JavascriptExecutor) driver).executeScript(scrollElementIntoMiddle, element);