Why JavaScript execution handles edge cases in Selenium Java - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to execute JavaScript that returns the page title.

Selenium Java

String title = (String) ((JavascriptExecutor) driver).executeScript([1]);

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

A"return window.title;"

B"document.title;"

C"return document.title;"

D"window.document.title"

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the return keyword causes null or undefined results.

Using window.title instead of document.title.

JavaScript execution requires the return keyword to get the value back to Java.

2fill in blank

medium

Complete the code to scroll the page down by 500 pixels using JavaScript.

Selenium Java

((JavascriptExecutor) driver).executeScript([1]);

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

A"scrollTo(0, 500);"

B"window.scrollBy(0, 500);"

C"window.scroll(500, 0);"

D"scrollBy(500, 0);"

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping x and y values causes horizontal scroll instead.

Using scrollTo instead of scrollBy changes absolute position.

window.scrollBy(0, 500); scrolls vertically down by 500 pixels.

3fill in blank

hard

Fix the error in JavaScript execution that tries to click an element but fails.

Selenium Java

((JavascriptExecutor) driver).executeScript([1], element);

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

A"arguments[0].click();"

B"click(arguments[0]);"

C"element.click();"

D"arguments.click();"

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names directly inside the script causes errors.

Calling click on arguments object instead of the element.

In JavaScript execution, arguments[0] refers to the passed element.

4fill in blank

hard

Fill both blanks to return the inner text of an element and trim whitespace.

Selenium Java

String text = (String) ((JavascriptExecutor) driver).executeScript("return arguments[0].[1].[2]();", element);

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

AinnerText

Btrim

CtextContent

Dstrip

Attempts:

3 left

💡 Hint

Common Mistakes

Using textContent may include hidden text.

Using strip() is not a JavaScript string method.

innerText gets visible text, and trim() removes extra spaces.

5fill in blank

hard

Fill all three blanks to create a map of element IDs to their text content using JavaScript execution.

Selenium Java

Map<String, String> texts = (Map<String, String>) ((JavascriptExecutor) driver).executeScript(
  "let result = {}; for(let el of arguments[0]) { result[el.[1]] = el.[2].[3](); } return result;",
  elements
);

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

Aid

BinnerText

Ctrim

DtextContent

Attempts:

3 left

💡 Hint

Common Mistakes

Using textContent instead of innerText includes hidden text.

Forgetting to call trim() leaves extra spaces.

Use id for keys, innerText for text, and trim() to clean spaces.