Understanding DOM (Document Object Model) in Selenium?
On This Page What is DOM?Importance of the DOM in Web Automation
The Document Object Model or DOM is a structure that represents the web page & # 8217; s content. The web page & # 8217; s visual appealingness depends on how DOM is rendered in the browser. Selenium uses this DOM structure to place web elements such as buttons, tie-in, stimulation fields, and images. Identifying these web component allows Selenium or any other mechanization creature to interact with the browser or simulate the user behavior. The DOM is a foundational concept in web development and web application test automation. What is DOM? The Document Object Model (DOM) is a programming interface for web document that represents the structure of a webpage as a tree of node. It grant browsers and automation tool to access, manipulate, and dynamically update content, attributes, and styles. Importance of DOM in Automation DOM Methods to Access Web Elements Selenium Locators with DOM The Document Object Model (DOM) is a programming interface for web documents. It represent the construction of a webpage as a tree of nodes, where each node corresponds to a piece of the webpage, such as elements, dimension, and text. The DOM provide a way for programs (like web browsers or JavaScript) to access, manipulate, and update a webpage & # 8217; s content, structure, and manner dynamically. DOM structures are create when a web page is rendered into the browser. Based on this model, the browser interprets and displays the constituent. It besides allows the automation quizzer to uniquely identify the specific ingredient and interact with them. Read More: The DOM is the backbone of web mechanization, and a solid grasp of its construction and functioning is crucial for creating efficient, reliable, and scalable automated test. Here are the reasons why it is important: 1. Foundation for Web Interactions 2. Element Identification and Manipulation 3. Dynamic Content Handling 4. Debugging and Troubleshooting 5. Customization and Optimization 6. Universal Applicability Read More: The DOM postdate a hierarchic and tree-like construction. Each node corresponds to a portion of the page, such as constituent, attribute, or textbook, and these knob are organized in a parent-child relationship. The Document Node, Element Nodes, Text Nodes, Attribute Nodes, and Comment Nodes are a few different types of nodes available on the DOM tree. The parent-child relationship in the DOM Tree refers to the hierarchical construction in which elements and nodes are organized. This relationship allows for a relationship between the nodes. Example Considering the above example & lt; div & gt; is the parent node. It can hold multiple child nodes, such as text nodes, or comments, forming a nested structure. This relationship allows for the selection, pilotage, and manipulation of elements in the DOM. DOM elements can be traversed bidirectionally, like parent to child or child to nurture, as they are complect. By understanding this, developers can likewise add, remove, and update the nodes dynamically using programming languages. Here is a DOM representation in Tree Format: Here is a representation of DOM In HTML Code: Read More: In the Document Object Model (DOM), attributes, element, and nodes are fundamental constituent that represent the construction and substance of a webpage. Understanding these concepts is important to write mechanisation script. Elements are basically HTML tags or components of web pages such as & lt; p & gt;, & lt; div & gt;, & lt; a & gt;, etc. Each factor can lie of one or more child elements, nodes, and dimension. Example In the above exemplar & lt; a & gt;:is an element that represents a nexus. It has text Click here, which is a text node and attribute & # 8220; href & # 8221;. Attributes are associated with the component that provides additional information about the element. Example In the above instance: The dimension name is href, and the value ishttps: //browserstack.com, which will be interpreted by the browser when you click on the text ‘Click Here’ you will be navigate to the page. In DOM, everything is represented by a node. Below are a few different eccentric of node The DOM provides various ways to interact with the element. Using DOM method, you can besides manipulate the elements dynamically. These method are typically access through JavaScript, allowing you to name, change, or perform action on specific elements. Additionally, these method can be used in automation tools like Selenium to do actions. This method permit access to the HTML factor using the unique id attribute. This is a fast and effective way to access the DOM element Example This method allows access to the HTML elements using the grade name. Multiple constituent can belong to the like stratum, so it returns the accumulation of component. Example This method allows access to the HTML elements using the HTML Tags. This method also returns the assemblage of elements Example Using this method, you can use any valid CSS selector to target elements. It returns the first lucifer element This method retrovert all elements that match the CSS selectors. That intend it returns the collection of elements preferably than a individual ingredient. This is a property usable in DOM, which can be utilize to admittance the parent node of a specific element Example This property revert a live NodeList of a specific factor ’ s baby nodes, which can consist of element nodes, text nodes, and remark nodes. Example This holding allows to fetch the next available siblings of the specific constituent Example This property allows fetching the late sib of a specific ingredient Example Selenium, as a framework, ply various ways to access the component similar to DOM method. As Selenium supports multiple languages, the signature might differ slightly count on the programming languages. Since Java is usually employ with Selenium, below is the list of method usable in Java. Selenium provides method like driver.findElement () and driver.findElements () habituate this you can access elements with ID, name, or attribute values. driver.findElement (): is a Selenium WebDriver method used to locate and return the first matching web ingredient on a webpage based on a specified locater scheme. Syntax Example Syntax Example Syntax Example The getAttribute () method in Selenium is utilize to fetch the value of a delineate attribute from a web factor. Syntax Example The className and tagName methods are used to get the locater establish on the family name and tag gens respectively Syntax Example Pro tip: Tools like SUSA can handle this autonomously — upload your app and get results without writing a single test script. Syntax Example CSS Selectors allow access to the Elements using the CSS values. It is the nearly flexible and easy-to-use type of selector in Selenium. This will grant you to use dimension, stratum, IDs, and access elements in the DOM. Syntax Example Read More: XPath stands for XML Path Language. It allows you to navigate the HTML element use the Selenium. Like CSS, XPath is pliant in accessing elements based on ID, Tag, property value, and text. Considering XPath, you can access elements using any HTML attributes such as class, id, gens, etc. Syntax Example Syntax Example The contains function can be expend along with any attributes or schoolbook to regain the factor in XPath ContainsContais with Attribute Syntax Example Syntax Example Read More: XPath allows permeate the query using the logical operations like AND, OR, =, etc. Syntax Example Read More: To build a locater, it is significant to understand how to view the DOM tree and inspect it use the browser. Modern browser get with Developer Tools (DevTools) that help you see and interact with the construction, attributes, and styles of web elements. Steps to Inspect the DOM using the Chrome Browser: You can right-click on the web page and click on inspect the elements to open the DevTools. Alternatively, you can also use the keyboard shortcuts Ctrl+Shift+I (Windows) / Cmd+Option+I (Mac) to open. There are multiple tabs available in the Browser DevTools. The ingredient tab provides the structure of HTML. In the DevTools chink on Elements Tab. From the web page choose the specific portion like push, lintel, carte, etc. and right click and so click on inspect element to highlight the elements in the Elements Tab. Selectors are constantly ground on the unique values of ID, Class, attributes, etc. Check yourself which selection is available for a specific element. Based on the above step you might receive constructed the selectors/locators. Using the lookup text box available within the Chrome Elements you can paste the selector to examine. It should show at least 1 match. Note: Chrome also provides copy Xpath and transcript CSS Selector pick when you right-click on the elements. However, it is for beginners and is not recommended for use. It may be helpful when you apace require to examine something. Steps to Inspect the DOM utilise the Chrome Browser 1. Exposed Developer Tools Right-click on the webpage and select Inspect Element or press Ctrl+Shift+I (Windows) / Cmd+Option+I (Mac). 2. Navigate to the Inspector Tab The Inspector tab in Firefox allows you to watch and interact with the DOM construction. Make certain you are in the Inspector Tab if not click on the inspector Tab to move the centering. 3. Inspect the constituent Right Click on the specific element in the web page, and detent on inspect it should highlight the specific element in the DOM tree 4. Check for attributes, classes, or ids Check the element & # 8217; s attributes like id, gens, and class and create the Selenium locators 5. Test the Selectors Like Chrome, Firefox also provide search functionality with selectors, so you can copy and paste the selectors into the lookup box to see the matches. If it doesn ’ t employment, you can also use the browser console tab to find the component apply JavaScript commands like document.querySelector () or document.evaluate (). Read More: Identifying the dynamic element can be challenging. The dynamical elements load as you perform the action after the initial load. Typically, dynamical elements do not have static IDs or form names. Because of that, you can not use them to build the selectors. The dynamic. Dynamic elements ofttimes tack the dynamic text along with the inactive dimension name. For representative, In the above illustration, each clip you load the page, the static part of the classtalktous-btnrest the same. However, the active part92349wy3may modify. In such position, you can use fond matching locator like below In the above example, * is used to tally any factor that contains the text & # 8216;talktous-btn& # 8216;. You can also use XPath, which control the function to do the same. There might be a scenario where you may not chance the partial matching property. The alternative option you can use is text-based selector. For example, use XPath with text () function to generate the locator Consider you have html like below In the above HTML you may not notice any attributes to do a partial match in such cases, you can use the textbook () function in Xpath like below The is a web standard that enables developer to encapsulate and sequestrate CSS and JavaScript within web components. It works by attaching a hidden Document Object Model (DOM), known as the & # 8220; Shadow DOM, & # 8221; to a host element referred to as the & # 8220; Shadow Host. & # 8221; While the Shadow DOM offers significant advantages for development, such as improved modularity and style encapsulation, it demonstrate challenges for test automation. Traditional automation tool like Selenium can not directly interact with elements within the Shadow DOM, making it difficult to locate and manipulate these element during testing. Specialized techniques or tools that support Shadow DOM interaction are required to effectively handle Shadow DOM and nested ingredient, ensuring accurate and efficient automation. To access ingredient inside the Shadow DOM, you ask to first locate the shadow host constituent, and then use JavaScript to access the shadow rootage. Example: In the above example, The Nested elements can be easy access by the CSS selector or XPath picker. CSS allows admission to the nested elements. You can use the space descendant combinator to locate nested element. Example: In the above example, the input.child element is access, which is located under the parent element div.parent-class. Xpath likewise allows accessing the nested component. In the above example, the (& # 8220; //div [@ class= & # 8217; parent-class & # 8217;] //input [@ class= & # 8217; child-class & # 8217;] & # 8221;) expression will seek for the factor input [@ class= & # 8217; child-class & # 8217;] within the parent element div [@ class= & # 8217; parent-class & # 8217;]. Dynamic message in the web page is furnish after the initial load or after specific user interaction. Dynamic context may take time and it may not be instantly available. To handle this you require to use explicit wait. Explicit wait is a waiting mechanics in Selenium that wait for specific found on the afford condition, before performing activeness. This aid to control the dynamic element is in the DOM tree before performing action. Example In the above example, There are many uncommitted. Below are a few of the virtually frequently used conditions. Read More: JavaScript Executor in Selenium allows you to execute JavaScript code to handle complex scenario. By apply JavaScript Executor, you can misrepresent the DOM tree such as clicking, scroll, altering the text, getting attributes, etc. Below are some of the common use cases of Java Script executor in Selenium: Basic Syntax If your web driver clicks don ’ t employment for any reason, you can use the JavaScript chink to trigger the click event on the browser. Example You can use the JavaScript executor to scroll the page to a specific element Example Read More: You can also change the text of any element dynamically during automation execution. You can build the logic for cover the component or make it visible using the JavaScript executor. Using JavaScript execution you can get the attribute value as shown below. Example If Selenium default reload dictation works, using JavaScript you can assume the same. Example The following are some of the mutual challenge that occur when act with DOM in Selenium: Elements are not often visible due to dynamic rendering, or they may appear after some time. Solution: Use the active locator mechanism with explicit timeout, as explained in the previous sections. This pass when you try to interact with an element that was previously located but has been refreshed or remove from the DOM. Solution: Re-locate the element before interacting with it or use a try-catch block to re-find the element in case of this elision Example: Elements within the iFrame can not be accessed directory, which requires a especial mechanics to handle. Selenium provides switchTo () .frame () method to do such activity Example: If you use selection scroll with action classes frequently, it may fail. The roll depends on web architecture and implementation. You can use the JavaScript curlicue apply the JavaScript executor as mentioned in the previous section to solve such problems. Here are some of the best practices to follow when performing Selenium Test Automation: Read More: helps to interact with the DOM dynamically employ the synergistic session. It allows you to regard, interact, and debug any ongoing test session on the platform. Here ’ s how it assist in DOM testing: Additionally, BrowserStack render the following benefits: Steps to Launch an Synergistic Session in BrowserStack: Step 1.Run your test script in your. Step 2. Navigate to your ongoing session page and pawlStart an synergistic session. Step 3.After an interactive session start, perform any manual testing project in the interactional window on the Automate session page. Step 4.Stop the manual testing session by clicking Stop Interactive Session. Check out this By into your workflow, you can achieve comprehensive DOM quiz that covers functional, responsive, and visual aspects, control your web applications render a unflawed user experience. Refer to the following documentation for more information: Understanding DOM concepts is important while performing the automation. DOM acts as a foundation for all automation puppet. Modern applications incorporate advanced mechanisms like, dynamic loading, etc. Though these features benefit application development, considering test automation it wreak a lot of challenge. Mastering DOM concepts can help to achieve such scenario mechanization using workarounds. Additionally, the DOM rendering may differ from browser to browser and platform to platform to check a smooth user experience, it is important to try them with different operating systems and browser combinations. comes in handy while testing such scenarios. Furthermore, it also provides many innovative capabilities like interactive sessions, integration with, effortless debugging, etc. This aid quick identify the device, browser, or operating-specific issues and fix them before your codification goes to production. On This Page # Ask-and-Contributeabout this theme with our Discord community. Upload your APK or URL. SUSA explores like 10 real users — finds bugs, accessibility violations, and security issues. No scripts needed. Upload your APK or URL. SUSA explores like 10 real users — finds bugs, accessibility violations, and security issues. No scripts.Understanding DOM (Document Object Model) in Selenium?
Overview
These methods countenance examiner to traverse and interact with the DOM for efficient mechanization.What is DOM?
Importance of the DOM in Web Automation
Structure of the DOM
Understanding Parent-Child Relationships in the DOM
& lt; div & gt; & lt; p & gt; Hello & lt; /p & gt; & lt; span & gt; Hi & lt; /span & gt; & lt; /div & gt;
Attributes, Elements, and Nodes
Elements
& lt; a href= '' https: //browserstack.com '' & gt; Click Here & lt; /a & gt;
Attributes
& lt; a href= '' https: //browserstack.com '' & gt; Click Here & lt; /a & gt;
Nodes
Accessing Web Elements via DOM Methods
1. getElementById ()
var element = document.getElementById (`` submitB '');
2. getElementsByClassName ()
var ingredient = document.getElementsByClassName (`` customer-names '');
3. getElementsByTagName ()
var divs = document.getElementsByTagName (`` div '');
4. querySelector ()
var firstButton = document.querySelector (`` button.expand '');
5. querySelectorAll ()
var allLinks = document.querySelectorAll (`` a [href^='https: // '] '');6. parentNode
var parent = document.getElementById (`` submitBtn '') .parentNode;
7. childNodes
var children = document.getElementById (`` container '') .childNodes;
8. nextSibling
var next = document.getElementById (`` submitBtn '') .nextSibling;
9. previousSibling
var next = document.getElementById (`` submitButton ''). previousSibling;
Using Selenium Locators with the DOM
1. ID and Name Attributes
driver.findElements (): is a Selenium WebDriver method that locates and returns a list of all correspond web elements on a webpage based on a specified locator strategy.WebElement component = driver.findElement (By.id (`` element_id ''));
WebElement usernameField = driver.findElement (By.id (`` email ''));
WebElement element = driver.findElement (By.name (`` element_name ''));
WebElement passwordField = driver.findElement (By.name (`` password ''));
WebElement element = driver.findElement (By.cssSelector (`` [attribute='value '] ''));
WebElement searchBox = driver.findElement (By.cssSelector (`` [type='text '] ''));
String attributeValue = element.getAttribute (`` attribute_name '');
WebElement emailField = driver.findElement (By.id (`` homepageLink '')); String attributeValue = homepageLink.getAttribute (`` href '');
2. Using Class Name and Tag Name Locators in Selenium
WebElement factor = driver.findElement (By.className (`` class_name '')); Example:
WebElement button = driver.findElement (By.className (`` submitBtn ''));
WebElement element = driver.findElement (By.tagName (`` tag_name ''));
WebElement spanElement = driver.findElement (By.tagName (`` span ''));
3. CSS Selectors
WebElement element = driver.findElement (By.cssSelector (`` css_selector ''));
//Access by id utilise cssSelector, # is used to indicate ID WebElement element = driver.findElement (By.cssSelector (`` # element_id '')); //Access by class gens apply cssSelector,. (dot) is used to indicate classID WebElement component = driver.findElement (By.cssSelector (`` .elementclass ``)); //Access constituent by attribute name. [] is apply to indicate the css attributes WebElement constituent = driver.findElement (By.cssSelector (`` [type=text] '')); //Combine CSS tag gens, stratum name WebElement heading = driver.findElement (By.cssSelector (`` h1.title ''));
4. XPath
WebElement ingredient = driver.findElement (By.xpath (`` //tagName [@ attributeName='value '] ''));
WebElement constituent = driver.findElement (By.xpath (`` //input [@ type='text '] '')); WebElement element = driver.findElement (By.xpath (`` //input [@ id='myBtn '] ''));
WebElement element = driver.findElement (By.xpath (`` //tagName [text () ='text value '] ''));
WebElement element = driver.findElement (By.xpath (`` //a [text () ='Learn More '] ''));
WebElement element = driver.findElement (By.xpath (`` //tagname [contains (@ attribute, 'value ')] ''));
WebElement element = driver.findElement (By.xpath (`` //input [contains (@ id, 'username ')] ''));
WebElement constituent = driver.findElement (By.xpath (`` //tagname [contains (schoolbook (), 'text ')] ''));
WebElement element = driver.findElement (By.xpath (`` //button [contains (text (), 'Click Here ')] ''));
WebElement ingredient = driver.findElement (By.xpath (`` //tagname [condition1 and/or condition2] ''));
// Using And WebElement component = driver.findElement (By.xpath (`` //input [@ type='text ' and @ name='username '] '')); //Using Or WebElement element = driver.findElement (By.xpath (`` //input [@ type='text ' or @ type='password '] ''));
Inspecting the DOM for Web Automation using Browser Developer Tools
Identifying Dynamical Elements in the DOM
Using Partial match
& lt; button & gt; Talk to Us & lt; /button & gt;
button [class * ='talktous-btn ']
Use Text-based Selectors
& lt; button & gt; Talk to us & lt; /button & gt;
//button [text () ='Talk to us ']
Handling Shadow DOM and Nested Elements
Handling Shadow DOM
WebElement shadowHost = driver.findElement (By.cssSelector (`` .my-shadow-host '')); WebElement shadowRoot = (WebElement) ((JavascriptExecutor) driver) .executeScript (`` return arguments [0] .shadowRoot '', shadowHost); WebElement shadowButton = shadowRoot.findElement (By.cssSelector (`` push '')); shadowButton.click ();
Handling Nested Elements
WebElement nestedElement = driver.findElement (By.cssSelector (`` div.parent-class input.child-class ''));
WebElement nestedElement = driver.findElement (By.xpath (`` //div [@ class='parent-class '] //input [@ class='child-class '] ''));
Interacting with Dynamic Content utilize Explicit Waits
WebDriverWait wait = new WebDriverWait (driver, Duration.ofSeconds (10)); WebElement constituent = wait.until (ExpectedConditions.visibilityOfElementLocated (By.id (`` myBtn ''))); element.click ();
Using JavaScript Executor to manipulate the DOM
JavascriptExecutor js = (JavascriptExecutor) driver; js.executeScript (`` java hand code here '');
Clicking an Element
WebElement component = driver.findElement (By.id (`` submitButton '')); JavascriptExecutor js = (JavascriptExecutor) driver; js.executeScript (`` argument [0] .click (); '', ingredient);
Scrolling the Page
WebElement element = driver.findElement (By.id (`` elementID '')); JavascriptExecutor js = (JavascriptExecutor) driver; js.executeScript (`` arguments [0] .scrollIntoView (true); '', element);
Change the Text
JavascriptExecutor js = (JavascriptExecutor) driver; js.executeScript (`` document.getElementById ('elementID ') .innerHTML = 'New Text '; '');JavascriptExecutor js = (JavascriptExecutor) driver; js.executeScript (`` document.getElementById ('elementID ') .style.display='none '; ''); // Hides the elementGet Attribute
JavascriptExecutor js = (JavascriptExecutor) driver; String text = (String) js.executeScript (`` return document.getElementById ('elementID ') .innerText; '');Reload the page
JavascriptExecutor js = (JavascriptExecutor) driver; js.executeScript (`` location.reload (); '');
Mutual Challenges working with DOM in Selenium
try {WebElement ingredient = driver.findElement (By.id (`` elementId '')); element.click ();} catch (StaleElementReferenceException e) {element = driver.findElement (By.id (`` elementId '')); element.click ();}driver.switchTo () .frame (`` iframeId ''); // Switch to iframe WebElement element = driver.findElement (By.id (`` elementId '')); element.click ();
Best Practices Selenium Test Automation
How BrowserStack helps with DOM Testing?
Conclusion
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