What methods does selenium use to compare elements?

Recently, a new method called equals() was introduced in the latest version of Protractor for an ElementFinder object. This method essentially utilizes the WebElement.equals() function from WebDriverJS:

return webdriver.WebElement.equals(this.getWebElement(),
    element.getWebElement ? element.getWebElement() : element);

But how exactly does the equals() method determine if elements are equal? Merely comparing the innerHTML wouldn't suffice as two distinct elements could look identical on a page.

javascriptseleniumselenium-webdriverprotractor

Answer №1

When using the .equals() method in WebDriverJS, which is JavaScript selenium bindings, it first compares the IDs of the WebElement (detailed in the webdriver spec here). These IDs are obtained through the getId() method:

var ids = [a.getId(), b.getId()];
return webdriver.promise.all(ids).then(function(ids) {
    if (ids[0][webdriver.WebElement.ELEMENT_KEY] ==
        ids[1][webdriver.WebElement.ELEMENT_KEY]) {
      return true;
    }
}

If the IDs match, then the two elements are considered equal. However, if they do not match, it does not necessarily mean that the elements are not equivalent. In such cases, the concept of DOM Node Equality is invoked through the elementEquals() wrapped method. This method checks for equality based on node types, attributes, namespaces, number of children, etc.

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