How to Locate Web Elements Using CSS Selector in Selenium?

In Selenium WebDriver, in order to interact with a web element such as a click, or type something, we need to first locate the elements. One of the most important tasks of a test automation engineer is to be able to identify different elements on the webpage. There are several element locators but, locating elements using CSS Selectors is the preferred way as it is faster than XPath.  

I hope you guys must have understood how to locate elements on the web page using XPath and the plugin which helps in locating the XPath, ChroPath which are widely used element locators in Selenium. So, in this article, we’ll see how CSS takes the front line in finding an element. For further details, you can refer to the Selenium Training.

Below are the topics we’ll be covering in this blog:

• What are locators? Why is it used? 
• Different types of locators
• What are CSS locators?
• Commands
• Demo

So let’s begin the discussion learning about what are the element locators in Selenium and why is it of such soaring importance.

CSS Selectors: What are element locators? Why is it used?

Locating elements is indeed a nightmare because of the complexity of finding a web element in the webpage and them. To simplify this task, we use something known as locators in Selenium. 

Locators are defined as an address that identifies a web element uniquely within the webpage. It is basically a command that tells the Selenium IDE which GUI elements like – Text Box, Buttons, Check Boxes, etc. it needs to operate on.

Finding correct GUI elements is considered as a prerequisite for creating an automation script but, accurate identification of GUI elements is much more difficult than it sounds. Sometimes, you might even end up working with incorrect GUI elements or no elements at all! Hence, using the right locator ensures that the tests are faster, more reliable or has lower maintenance.

This helps us understand what Selenium can actually do. Now that you’ve understood what are element locators, let’s dive deeper and understand the various types of locators in Selenium. Learn more about Automation Testing and its applications from the Automation Testing Certification.

CSS Selectors: Different Types of Selenium Locators

There is a distinct range of web elements such as text box, check box, drop down menu, radio button, etc. It requires an effective and accurate approach to identify these elements. Thereby, you can propound that with an increase in the effectiveness of locator, the stability of the automation script will increase.

In order to identify web elements accurately and precisely, Selenium makes use of different types of locators. They are as follows:

• Id locator
• Name locator
• linkText & Partial linkText
• CSS Selector
• XPath

Let’s understand each of them in detail.

1. ID locator: The most popular way to identify web element is to use ID. ID’s are considered as the safest and fastest locator option and should always be the first priority among the multiple locators.
2. Name locator: This is also an effective way to locate an element which has a name attribute. With this strategy, the first element with the value of the name attribute will be returned. If no element has a matching name attribute, then a  NoSuchElementException will be raised.
3. LinkText & ParialLinkText: You can identify the hyperlinks on a web page using this linkText. It can be determined with the help of an anchor tag (<a>). In order to create the hyperlinks on a web page, you can use the anchor tags followed by the link text. In some cases, you may need to find links by a portion of the text in a linkText element. In such situations, you can use Partial Link Text to locate elements.
4. CSS Selectors: CSS is mainly used to provide style rules for the web pages and you can use it for identifying one or more elements in the web page. The CSS selector is always the best possible way to locate complex elements in the page. We’ll talk more about CSS selectors in the next topic. 
5. XPath: XPath is a language to query XML documents. XPath is an important strategy to locate elements in selenium. It also consists of a path expression along with some conditions. Here, you can easily write an XPath script/query to locate any element in the webpage. 

Also, take a look at this video on different types of element locators in Selenium.

CSS Selectors: What are CSS Selectors?

As we know every modern web page is build of CSS, they define the cosmetic behavior (like size, fonts, inclination, etc.) of the whole page and/or objects in the page. The CSS rules do the grouping by class names of objects to define the combined cosmetic behavior of those objects. Similarly, we can use Object’s id property to define the individual object’s look and feel. We can also use CSS properties to identify objects.

This CSS Selector is the combination of an element and a selector value, which identifies the web element within a web page. The composite of an element and selector value is known as the Selector Pattern. This selector pattern is constructed using HTML tags, attributes, and their values. 

Using CSS selectors to locate elements has some benefits:

• It is faster
• More readable
• And used more often

Now let’s take a look at a few basic commands which help in locating the elements.

CSS Selector: Basic commands

First, let’s take a look at the syntax.

Syntax of CSS Selector

• HTML Tag: It is the tag which is used to denote the web element.
• #: The hash sign is used to symbolize the ID attribute. It is mandatory to use the hash sign if the ID attribute is being used.
• Value of ID attribute– It is the value of an ID attribute which is being accessed. The value of ID is always preceded by a hash sign.

example:

driver.findElement(By.cssSelector("#gh-btn")).click();

If we have the class attribute specified, 

This command helps in finding the element which has a class attribute specified.

• .– The dot sign is used to symbolize Class attribute. It is mandatory to use a dot sign if a Class attribute is being used.
• The value of Class is always preceded by a dot sign.

Example: 

driver.findElement(By.cssSelector(class.’typeahead__button’)).click();

• <HTML tag> [ locator * = ‘value’ ]

• This command used to correspond to the string with the help of a matching substring.
• *– Symbolic notation to match a string using substring.
• Substring– It is the string based on which match operation is performed. The likely string is expected to have the specified string pattern

Example:

css=input#Passwd[name$=’wd’]

<HTML tag> [ locator  ^ = ‘value’ ]

• ^– Symbolic notation to match a string using the prefix.
• Prefix– It is the string based on which match operation is performed. The likely string is expected to start with the specified string.

Example

css=input#Passwd[name^=’Pass’]

<HTML tag> [ locator $ = ‘value’ ]

• $– Symbolic notation to match a string using the suffix.
• The suffix– It is the string based on which match operation is performed. The likely string is expected to end with the specified string.

Example

css=input#Passwd[name$=’wd’]

• <HTML tag> <:> <contains> <(text)>

• :– The dot sign is used to symbolize contains a method
• Contains – It is the value of a Class attribute which is being accessed.
• Text – The text that is displayed anywhere on the web page irrespective of its location.
• This is one of the most frequently used strategies to locate web element because of its simplified syntax.

Example

css=input#Passwd[name:’Pass’]

Having understood this, we’ll move on and take a look at a demo where we’ll learn how CSS Selectors in Selenium Webdriver work.

CSS Selector: Demo

We’ll perform automation testing on one of the most famous e-commerce websites, i.e. Ebay.com in this demo. Let’s see how this can be done. We will see how to register the drivers for chrome and how to search an element on the page. We’ll consider working on the Eclipse IDE because it is easy to execute Java programs. 

For google chrome, you need to install a chrome driver in your system. Now let’s take a closer look at the code. As you can see,

• I have used System.setproperty() to set the path of chrome driver.
• Then I am using driver.get() to navigate to ebay.com.
• Maximize the web page
• Initialize the JavascriptExecutor which acts as an interface while working with Selenium
• Find the search box using the CSS Selector and add a # before specifying the ID,  and then send keys to the search box.
• Search the search icon on the web page using the CSS Selector and click it.
• Then we’ll scroll down the web page using the JavascriptExecutor and specify the axis in which we want to scroll.

package co.edureka;

import org.openqa.selenium.By;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;

public class DemoClass {

public static void main(String[] args) {
System.setProperty("webdriver.chrome.driver", "C:UsersVaishnaviDesktopChromechromedriver.exe");
WebDriver driver = new ChromeDriver();
driver.get("http://ebay.com");
driver.manage().window().maximize();
JavascriptExecutor js = (JavascriptExecutor) driver;
driver.findElement(By.cssSelector("#gh-ac")).sendKeys("OnePlus6T");
driver.findElement(By.cssSelector("#gh-btn")).click();
js.executeScript("window.scrollBy(0,300)");
}

}

This yields the output

First, this will open ebay.com and then we’ll search for OnePlus6T and click on the search icon.

After this, we’ll scroll down the page.

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Now with this, we come to an end to this “CSS Selector in Selenium” blog. I Hope you guys enjoyed this article and understood what role CSS has to play in Selenium. Now that you have understood how to locate an element using the CSS Selector, check out the Selenium Certification Course by Edureka, a trusted online learning company with a network of more than 650,000 satisfied learners spread across the globe. This course is designed to introduce you to the complete Selenium features and its importance in testing software. Got a question for us? Please mention it in the comments section of “CSS Selectors in Selenium” and we will get back to you.