findElement by ID in Selenium Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to find an element by its ID using Selenium WebDriver.

Selenium Java

WebElement element = driver.findElement(By.[1]("submitBtn"));

Drag options to blanks, or click blank then click option'

Aname

BclassName

Cid

DtagName

Attempts:

3 left

💡 Hint

Common Mistakes

Using By.name instead of By.id when the locator is an ID.

Using incorrect locator methods like By.className for an ID.

The findElement method uses By.id to locate an element by its ID attribute.

2fill in blank

medium

Complete the code to click on a button found by its ID.

Selenium Java

driver.findElement(By.[1]("loginButton")).click();

Drag options to blanks, or click blank then click option'

AcssSelector

Bid

Cxpath

DlinkText

Attempts:

3 left

💡 Hint

Common Mistakes

Using By.cssSelector or By.xpath when the ID locator is simpler.

Trying to click before finding the element.

Clicking an element found by its ID requires using By.id as the locator.

3fill in blank

hard

Fix the error in the code to correctly find an element by ID.

Selenium Java

WebElement input = driver.findElement(By.[1]("userName"));

Drag options to blanks, or click blank then click option'

Aid

Bname

CclassName

DtagName

Attempts:

3 left

💡 Hint

Common Mistakes

Using By.name or By.className when the element is identified by ID.

Misspelling the locator method.

The correct locator to find an element by its ID is By.id. Other locators will not find the element by ID.

4fill in blank

hard

Fill both blanks to find an element by ID and get its text.

Selenium Java

String text = driver.findElement(By.[1]("message")).[2]();

Drag options to blanks, or click blank then click option'

Aid

BgetText

Cclick

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using click() instead of getText() when trying to read text.

Using By.name instead of By.id.

Use By.id to locate the element and getText() to retrieve its visible text.

5fill in blank

hard

Fill all three blanks to find an element by ID, clear its content, and enter new text.

Selenium Java

WebElement input = driver.findElement(By.[1]("searchBox"));
input.[2]();
input.[3]("Selenium testing");

Drag options to blanks, or click blank then click option'

Aid

Bclear

CsendKeys

Dclick

Attempts:

3 left

💡 Hint

Common Mistakes

Using click() instead of clear() before typing.

Using wrong locator methods like By.name.

Forgetting to clear the input before sending keys.

First, find the element by ID using By.id. Then clear the input field with clear(). Finally, enter text using sendKeys().

Practice

1. What does the Selenium method findElement(By.id("submitBtn")) do?

easy

A. Finds elements by their tag name "submitBtn".

B. Finds the first element on the page with the ID "submitBtn".

C. Finds elements by their class name "submitBtn".

D. Finds all elements with the ID "submitBtn".

Solution

1. Step 1: Understand the method purpose

   The method findElement locates a single web element on the page.

2. Step 2: Analyze the locator used

   Using By.id("submitBtn") means it looks for an element with the exact ID "submitBtn".

3. Final Answer:

   Finds the first element on the page with the ID "submitBtn". -> Option B

4. Quick Check:

   findElement + By.id = single element by ID [OK]

Hint: findElement(By.id) always returns one element by unique ID [OK]

Common Mistakes:

• Confusing findElement with findElements (plural)
• Using class name or tag name instead of ID
• Assuming it returns multiple elements

2. Which of the following is the correct syntax to find an element with ID "username" in Selenium Java?

easy

A. driver.findElement(By.id="username");

B. driver.findElement(By.Id("username"));

C. driver.findElement(By.ID("username"));

D. driver.findElement(By.id("username"));

Solution

1. Step 1: Recall correct method syntax

   The method By.id is called with parentheses and a string argument, like By.id("username").

2. Step 2: Check Java case sensitivity

   Java is case-sensitive, so By.id must be lowercase 'id', and parentheses are required.

3. Final Answer:

   driver.findElement(By.id("username")); -> Option D

4. Quick Check:

   Correct method call syntax = driver.findElement(By.id("username")); [OK]

Hint: Use By.id("value") with parentheses and lowercase 'id' [OK]

Common Mistakes:

• Using assignment '=' instead of parentheses
• Wrong capitalization like By.ID or By.Id
• Missing parentheses around the ID string

3. What will happen when the following code runs if no element with ID "loginBtn" exists on the page?

WebElement button = driver.findElement(By.id("loginBtn"));
button.click();

medium

A. Throws NoSuchElementException at findElement line.

B. Throws NullPointerException at button.click().

C. The code clicks the button successfully.

D. Returns null and skips the click.

Solution

1. Step 1: Understand findElement behavior when element missing

   If no element matches the ID, findElement throws NoSuchElementException immediately.

2. Step 2: Analyze code flow

   The exception occurs at the findElement line, so button.click() is never reached.

3. Final Answer:

   Throws NoSuchElementException at findElement line. -> Option A

4. Quick Check:

   Missing element causes NoSuchElementException [OK]

Hint: findElement throws exception if ID not found, no null returned [OK]

Common Mistakes:

• Assuming findElement returns null if element missing
• Expecting NullPointerException instead
• Thinking click() runs even if element not found

4. Identify the error in this Selenium Java code snippet:

WebElement input = driver.findElement(By.id("email"));
input.sendKeys("[e-mail]");
WebElement submit = driver.findElement(By.id("submit"));
submit.click();

Assuming the page has no element with ID "submit".

medium

A. Throws ElementNotInteractableException at sendKeys line.

B. No error; code runs fine.

C. Throws NoSuchElementException at finding "submit" element.

D. Throws StaleElementReferenceException at click line.

Solution

1. Step 1: Check element existence for each findElement

   The element with ID "email" exists, so sendKeys works fine.

2. Step 2: Analyze finding "submit" element

   Since "submit" ID does not exist, findElement(By.id("submit")) throws NoSuchElementException.

3. Final Answer:

   Throws NoSuchElementException at finding "submit" element. -> Option C

4. Quick Check:

   Missing ID causes NoSuchElementException [OK]

Hint: Missing ID in findElement causes NoSuchElementException [OK]

Common Mistakes:

• Assuming sendKeys fails if element missing later
• Confusing exceptions thrown at different lines
• Expecting click() to throw error instead of findElement

5. You want to fill a form field with ID "userEmail" and then click a button with ID "submitBtn". Which code snippet correctly handles the possibility that the button might not be present, avoiding test failure?

hard

A. driver.findElement(By.id("userEmail")).sendKeys("[e-mail]");
try {
driver.findElement(By.id("submitBtn")).click();
} catch (NoSuchElementException e) {
System.out.println("Button not found, skipping click.");
}

B. driver.findElement(By.id("userEmail")).sendKeys("[e-mail]");
WebElement btn = driver.findElement(By.id("submitBtn"));
if(btn != null) {
btn.click();
}

C. driver.findElement(By.id("userEmail")).sendKeys("[e-mail]");
driver.findElement(By.id("submitBtn")).click();

D. driver.findElement(By.id("userEmail")).sendKeys("[e-mail]");
WebElement btn = null;
btn.click();

Solution

1. Step 1: Understand the problem

   The button with ID "submitBtn" might not exist, so clicking it directly may cause an exception.

2. Step 2: Evaluate each option

   driver.findElement(By.id("userEmail")).sendKeys("[e-mail]"); driver.findElement(By.id("submitBtn")).click(); clicks without checking, risking failure. driver.findElement(By.id("userEmail")).sendKeys("[e-mail]"); WebElement btn = driver.findElement(By.id("submitBtn")); if(btn != null) { btn.click(); } attempts null check but throws NoSuchElementException at findElement since it never returns null. driver.findElement(By.id("userEmail")).sendKeys("[e-mail]"); try { driver.findElement(By.id("submitBtn")).click(); } catch (NoSuchElementException e) { System.out.println("Button not found, skipping click."); } uses try-catch to handle missing button gracefully. driver.findElement(By.id("userEmail")).sendKeys("[e-mail]"); WebElement btn = null; btn.click(); assigns null and calls click(), causing NullPointerException.

3. Final Answer:

   Use try-catch to handle missing element and avoid failure. -> Option A

4. Quick Check:

   Try-catch handles missing element safely [OK]

Hint: Use try-catch to handle missing elements safely [OK]

Common Mistakes:

• Not handling missing elements causing test failure
• Calling click() on null element
• Assuming findElement returns null if element is missing