Interacting with shadow DOM elements using Selenium's JavaScriptExecutor in Polymer applications

Having trouble accessing the 'shop now' button in the Men's Outerwear section of the website with the given code on Chrome Browser (V51)'s JavaScript console:

document.querySelector('shop-app').shadowRoot.querySelector('shop-home').shadowRoot.querySelector('shop-button');

When attempting to access the same element in my automation test using Selenium:

Line 1: 

WebElement shopBtn = (WebElement)((JavascriptExecutor)driver).executeScript("return document.querySelector('shop-app').shadowRoot.querySelector('shop-home').shadowRoot.querySelector('shop-button')");

Line 2: shopBtn.click();

This code results in the following error:

Exception in thread "main" org.openqa.selenium.WebDriverException: unknown error: Cannot read property 'querySelector' of null
   (Session info: chrome=51.0.2704.106)
   (Driver info: chromedriver=2.20.353124 (035346203162d32c80f1dce587c8154a1efa0c3b),platform=Mac OS X 10.11.3 x86_64).

Any assistance on this matter would be greatly appreciated.

javascriptseleniumpolymershadow-dom

Answer №1

It seems like you may be working with Java, based on your question. Below is a sample code snippet that does not rely on JSE.

WebDriver driver = new FirefoxDriver();
String searchText = "Men's Outerwear";
driver.get("https://shop.polymer-project.org/");
WebDriverWait wait = new WebDriverWait(driver, 5);
List<WebElement> sections = wait.until(ExpectedConditions.presenceOfAllElementsLocatedBy(By.cssSelector("div.item")));
for (WebElement section : sections)
{
    if (section.getText().toLowerCase().contains(searchText.toLowerCase()))
    {
        section.findElement(By.linkText("SHOP NOW")).click();
        break;
    }
}

Answer №2

In order to locate the specific element, you need to iterate through each of the shadow root elements individually.

document.querySelector('nuxeo-app').shadowRoot.querySelector('nuxeo-document-create-button').shadowRoot.querySelector('paper-fab').shadowRoot.querySelector('iron-icon');

Answer №3

Attempting to execute a click operation, I successfully achieved it with the help of Firefox and an XPath locator.

.//shop-button/a[starts-with(@aria-label, 'Men') and contains(@aria-label, 'Outerwear Shop Now')]

Utilizing Selenium 3 for this task.

Uncertain if my current method is correct.

Cheers!

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