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Selenium WebDriver Element Locators
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Selenium WebDriver Element Locators

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Ilan Malyanker, automation developer at LivePerson presented: "Selenium WebDriver Element locators" As part of "Selenium Israel Meetup #3", at Google Campus TLV ...

Ilan Malyanker, automation developer at LivePerson presented: "Selenium WebDriver Element locators" As part of "Selenium Israel Meetup #3", at Google Campus TLV (http://www.meetup.com/Selenium-Israel/events/169326892/)

In continuous integration world, stability and reliability of tests are placed much higher in the priority list of more and more organizations. System tests involving web sites simulation & verification would be more robust and reliable when the locators used, are carefully selected and configured.

For our tests to survive version changes,GUI updates & modifications, the following is required:

1. Use the correct locating strategy
2. Supply the appropriate locator string with maximum focus and minimum external dependencies

This is an overview of all WebDriver locator strategies, provided by selenium module.

The credit for some of the ideas and samples should be given to:
- http://www.w3schools.com/cssref/css_selectors.asp
- Selenium Testing Tools Cookbook
- http://stackoverflow.com

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  • - All examples are in Java - FindElements() - find from another element - Best practice
  • There’s also By.className, By.name

Selenium WebDriver Element Locators Selenium WebDriver Element Locators Presentation Transcript

  • Element Locators Ilan Malyanker Thursday, April 3rd, 2014
  • Connection Before Content creates meaningful, real time customer connections that help businesses increase conversions and improve consumer experience. LivePerson is hiring- peoplejobs@liveperson.com Ilan Malyanker Works in LP for 3 years. 8 years as an automation engineer. Blog- http://software-automation-development.blogspot.com mail- ilanm@liveperson.com / malyankeri@yahoo.com
  • Purpose & Motivation • Identify elements to simulate operations • Identify elements to verify their status • Help create robust testing framework • Share knowledge • Expose new options for automation developers
  • Terms & Code Alignment - Demo • HTML terms in WebDriver context • WebDriver basic usage • Think of WebDriver as a browser instance • WebElement- as any seen object on the page
  • “By” class • Selenium WebDriver provides By class to support various locator strategies • Find methods take a locator or query object as an instance of By class as an argument
  • Locating Elements Using • Id • Links • Tag names • Css Selectors • Xpath • JQuery • Text
  • Browser Tools For Element Inspection • Firefox - „Firebug‟ add-on (right click → „Inspect Element‟ / F12). „FirePath‟ – Optimizing CSS & XPath • Chrome - Built-in page analyzing feature (right click → „Inspect Element‟ / F12) • IE - Developers tool („Tools‟ → „Developers Tools‟ / F12). There‟s also FireBug for IE. • Console – Immediate diagnose & execution tool. Available on all tools
  • Languages • Java: driver.findElement(By.id(<element ID>)) driver.findElement(By.linkText(<linktext>)) • C#: driver.FindElement(By.Id(<elementID>)) driver.FindElement(By.LinkText(<linktext >)) • Python: driver.find_element_by_id(<elementID>) driver.find_element_by_link_text(<linktext >) • Ruby: driver.find_element(:id,<elementID>) driver.find_element(:link_text,< linktext >)
  • 0 matches: throws exception (org.openqa.selenium.NoSuchElementException) 1 match: returns list of 1 WebElement instance 2+ matches: returns only first appearance in DOM 1 match: returns WebElement instance 0 matches: returns an empty list 2+ matches: returns list with all matching instances FindElement vs. FindElements findElement() findElements()
  • Id driver.findElement(By.id(“<some_id>")); • Seems like the ideal solution • Id‟s don‟t always exist • Their uniqueness is not enforced • What about dynamic elements? • Might be used for other future purposes • Code injected from different sources (potential override) • Against web developers best practices
  • Links Find elements by the text displayed on the link driver.findElement(By.linkText(“<link_text>")); driver.findElement(By.partialLinkText(“<link_partial_text>"))
  • Tag Names Find web elements based on their HTML tags < class="form-inline"> < class="editable-controls"> <input class="editable-has-buttons" type="text"> <span class="editable-buttons"> <button class="btn btn-primary" type="submit"> <button class="btn btn-danger"> </span> </div> </form> driver.findElement(By.tagName("input")); *See that your tag is unique
  • CSS Selectors (1) • Cascading Style Sheets- language used for describing the presentation semantics of a document written in a markup language such as HTML or XML. • Browsers implement CSS parsing engines for formatting or styling the pages using CSS syntax. Absolute path: driver.findElement(By.cssSelector(“html>body>div>p>input")); Relative path: driver.findElement(By.cssSelector(“input")) *the first instance found
  • CSS Selectors (2) Regular attribute: tag with attribute value: driver.findElement(By.cssSelector(“button[name=„cancel‟]")); Special attributes: id: driver.findElement(By.cssSelector(“#save")); tag & id: driver.findElement(By.cssSelector(“button#save")); class attribute: driver.findElement(By.cssSelector(“.yoyo")); tag & class attribute: driver.findElement(By.cssSelector(“input.username"));
  • CSS Selectors (3) tag with attribute value: driver.findElement(By.cssSelector(“img[alt=„kuku‟]")); tag which has attribute: driver.findElement(By.cssSelector(“img[alt]")); tag which doesn‟t have attribute: driver.findElement(By.cssSelector(“img:not([alt])"));
  • CSS Selectors, advanced (last css slide) The first child of a tag with id: driver.findElement(By.cssSelector(“div#students:first-child")); The n-th child of a tag with id : driver.findElement(By.cssSelector(“form#loginForm:nth-child(3)")); Second descendent of div with id : driver.findElement(By.cssSelector(“div#ilan>p+*+p")); (first) tag which is enabled: driver.findElement(By.cssSelector(“button:enabled"));
  • Xpath (1) • Xpath is a query language for selecting nodes from an XML document. • Xpath is based on a tree representation of the XML document and provides the ability to navigate around the tree. Absolute path: driver.findElement(By.xpath(“html/body/div/p/input")); Relative path: driver.findElement(By.xpath(“//input"))
  • Xpath (2) Tag with attribute value: driver.findElement(By.xpath(“//input[@id=„username‟]")); Any tag with id: driver.findElement(By.xpath(“//*[@id=„myId']")); Operator „and‟: driver.findElement(By.xpath(“//input[@type='submit'][@value='Login']”)); driver.findElement(By.xpath(“//input[@type='submit„ and @value='Login']”)); Opertor or: driver.findElement(By.xpath(“//input[@type='stam„ or @class=„LP']"));
  • Xpath (3) Attribute which starts with driver.findElement(By.xpath(“//input[starts-with(@class,„tbl_')]")); *there‟s also- ends-with() Attribute contains text: driver.findElement(By.xpath(“//input[contains(@id,'userName')]")); Match value to any attribute: driver.findElement(By.xpath("//input[@*='username']"));
  • Xpath (4) Ancestor, descendant, following, following-sibling, preceding, preceding-sibling driver.findElement(By.xpath(“//td[text()='Product 1']/ancestor::table")); element.findElement(By.xpath(“/table/descendant::td/input")); *can only be applied from another WebElement Use parent to get to same-hierarchy object: driver.findElement(By.xpath("//div/input[@class=„kuku‟]/../button"));
  • Text – CSS Selectors See if element‟s attribute contains specified text driver.findElement(By.cssSelector(“div[id*=„my_id„]")); (Also- ^ starts with, $ ends with) See if element contains specified text driver.findElement(By.cssSelector(“input:contains(„Some Text')")); *deprecated from CSS3 specification innerText attribute driver.findElement(By.cssSelector("td[innerText=„Some Text']")); *Doesn‟t work in FireFox textContent: driver.findElement(By.cssSelector("td[textContent=„text']")); *For FireFox
  • Text – XPath Locate element by matching exact text value driver.findElement(By.xpath(“//td/span[text()=„Some Text‟]")); OR driver.findElement(By.xpath("//td/span[.=„Some Text‟]")); See if Element contains specified text driver.findElement(By.xpath("//td[contains(text(),„Some Text')]"));
  • What‟s better, xpath or css selectors? • CSS Selectors method is faster • Browsers themselves use css selectors • Latest browsers optimize the use of css Selectors • Xpath- common language for xml/html parsing • Xpath is a two-way search mechanism (up&down the DOM tree) • Xpath handles text recognition better
  • JavaScript Executor for JS & JQuery JavaScript syntax as a Java String: String script = "return document.getElementById(„some-id');"; OR Jquery syntax as a Java String: String script = "return jQuery('#some-id').get(0);"; JavascriptExecutor executor = (JavascriptExecutor)driver; WebElement element = (WebElement)executor.executeScript(script); • Opens a world of client side manipulations • jQuery() method uses- css selectors i. jQuery lib should be loaded on the page ii. Same executor runs both types of scripts iii. jQuery returns a collection, hence extract the first instance iv. The “$” – sign could also represent jQuery namespace
  • Tips & Best Practices • Locators location • Use Enums • Know all your working tools • Element Detection & Highlighting • Expose locators and not just the methods • Work close to client developers (4 non agile developers) • Optimize your locators !! i Maximum focus ii Minimum dependencies
  • Visit my blog - software-automation-development.blogspot.com