Alert accept and dismiss in Selenium Java - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output after accepting the alert?

Consider the following Selenium Java code snippet that handles a JavaScript alert. What will be the printed output after the alert is accepted?

Selenium Java

WebDriver driver = new ChromeDriver();
driver.get("https://example.com/alert");
Alert alert = driver.switchTo().alert();
String alertText = alert.getText();
alert.accept();
System.out.println(alertText);

A Prints null

B No output is printed because accept() closes the alert silently

C Throws NoAlertPresentException

D The text inside the alert box is printed

💡 Hint

Remember that getText() reads the alert message before accepting it.

The getText() method retrieves the alert message before the alert is accepted. So the printed output is the alert's text.

❓ assertion

intermediate

Which assertion correctly verifies alert dismissal?

You want to verify that after dismissing an alert, a label on the page shows "Cancelled". Which assertion is correct?

Selenium Java

Alert alert = driver.switchTo().alert();
alert.dismiss();
String labelText = driver.findElement(By.id("resultLabel")).getText();

A assertEquals("Cancelled", labelText);

B assertTrue(labelText.contains("Cancelled"));

C assertFalse(labelText.equals("Cancelled"));

D assertNull(labelText);

💡 Hint

Check exact match of the label text after dismissing the alert.

The label should exactly show "Cancelled" after dismissing the alert, so assertEquals is the best choice.

🔧 Debug

advanced

Why does this alert accept code throw NoAlertPresentException?

Analyze the code below. Why does it throw NoAlertPresentException at runtime?

Selenium Java

driver.get("https://example.com/noalert");
Alert alert = driver.switchTo().alert();
alert.accept();

A No alert is present on the page when switchTo().alert() is called

B The alert is already accepted before calling accept()

C The alert text is empty

D The driver instance is null

💡 Hint

Check if the page actually shows an alert before switching.

NoAlertPresentException occurs because the code tries to switch to an alert that does not exist on the page.

❓ framework

advanced

Which Selenium wait strategy best handles alerts appearing asynchronously?

You want to wait for an alert to appear before accepting it. Which Selenium wait approach is best?

A Use implicit wait set to 10 seconds

B Use Thread.sleep(5000) before switching to alert

C Use WebDriverWait with ExpectedConditions.alertIsPresent()

D Use FluentWait ignoring NoAlertPresentException without condition

💡 Hint

Look for a wait condition specifically for alerts.

WebDriverWait with ExpectedConditions.alertIsPresent() waits efficiently for alert presence before switching.

🧠 Conceptual

expert

What happens if you call dismiss() on a prompt alert without sending input?

Consider a JavaScript prompt alert that asks for user input. What is the expected behavior if you call dismiss() without sending any text?

A The prompt throws an exception because input is required

B The prompt is closed and the input value is null or empty

C The prompt accepts with default text automatically

D The prompt remains open until input is sent

💡 Hint

Dismiss means canceling the prompt without input.

Calling dismiss() on a prompt closes it and returns null or empty input, simulating user cancel action.

Practice

1. What does the accept() method do when called on a JavaScript alert in Selenium?

easy

A. Clicks the OK button on the alert

B. Clicks the Cancel button on the alert

C. Closes the browser window

D. Throws an exception without interacting

Solution

1. Step 1: Understand alert interaction methods

   The accept() method is used to click the OK button on an alert popup.

2. Step 2: Differentiate from dismiss()

   The dismiss() method clicks Cancel, so accept() must click OK.

3. Final Answer:

   Clicks the OK button on the alert -> Option A

4. Quick Check:

   accept() = OK click [OK]

Hint: accept() clicks OK, dismiss() clicks Cancel [OK]

Common Mistakes:

• Confusing accept() with dismiss()
• Thinking accept() closes the browser
• Assuming accept() throws an exception

2. Which of the following is the correct syntax to switch to an alert and dismiss it in Selenium Java?

easy

A. driver.switchTo().alert().dismiss();

B. driver.switchTo().alert().cancel();

C. driver.switchTo().alert().close();

D. driver.switchTo().alert().accept();

Solution

1. Step 1: Identify the method to dismiss alert

   The method to click Cancel on an alert is dismiss().

2. Step 2: Confirm correct syntax for switching and dismissing

   The correct chain is driver.switchTo().alert().dismiss(); to dismiss the alert.

3. Final Answer:

   driver.switchTo().alert().dismiss(); -> Option A

4. Quick Check:

   dismiss() = Cancel click [OK]

Hint: Use dismiss() to cancel alerts, accept() to confirm [OK]

Common Mistakes:

• Using accept() instead of dismiss() to cancel
• Using non-existent methods like close() or cancel()
• Missing switchTo().alert() before calling dismiss()

3. Given the following code snippet, what will be printed if the alert is accepted?

driver.switchTo().alert().accept();
System.out.println("Alert handled successfully");

medium

A. UnhandledAlertException

B. Alert handled successfully

C. No output

D. Alert not found error

Solution

1. Step 1: Understand alert acceptance effect

   Calling accept() closes the alert, allowing the next line to execute.

2. Step 2: Check output after alert handling

   Since alert is accepted, System.out.println runs and prints the message.

3. Final Answer:

   Alert handled successfully -> Option B

4. Quick Check:

   accept() closes alert, next line prints [OK]

Hint: accept() lets code continue, so print runs [OK]

Common Mistakes:

• Expecting exception after accept()
• Thinking alert blocks print statement
• Confusing accept() with dismiss() effect

4. Identify the error in this Selenium Java code snippet that tries to dismiss an alert:

Alert alert = driver.switchTo().alert();
alert.accept();
alert.dismiss();

medium

A. alert.dismiss() should be alert.cancel()

B. Calling accept() before dismiss() causes an exception

C. Missing driver.switchTo() before alert()

D. Cannot call dismiss() after accept() on the same alert instance

Solution

1. Step 1: Understand alert lifecycle after accept()

   Once accept() is called, the alert is closed and no longer available.

2. Step 2: Calling dismiss() after accept() is invalid

   Trying to dismiss the same alert after accepting it causes an error because alert is gone.

3. Final Answer:

   Cannot call dismiss() after accept() on the same alert instance -> Option D

4. Quick Check:

   accept() closes alert, no dismiss() after [OK]

Hint: Alert closes after accept(), can't dismiss same alert [OK]

Common Mistakes:

• Calling dismiss() after accept() on same alert
• Assuming alert stays open after accept()
• Using non-existent cancel() method

5. You want to write a Selenium Java test that clicks Cancel on a confirmation alert only if the alert text contains the word "Delete". Which code snippet correctly implements this?

hard

A. Alert alert = driver.switchTo().alert();
if (alert.getText() == "Delete") {
alert.accept();
} else {
alert.dismiss();
}

B. Alert alert = driver.switchTo().alert();
alert.dismiss();
if (alert.getText().contains("Delete")) {
alert.accept();
}

C. Alert alert = driver.switchTo().alert();
if (alert.getText().contains("Delete")) {
alert.dismiss();
} else {
alert.accept();
}

D. Alert alert = driver.switchTo().alert();
alert.accept();
alert.dismiss();

Solution

1. Step 1: Check alert text for "Delete" substring

   Use alert.getText().contains("Delete") to detect if alert text includes "Delete".

2. Step 2: Dismiss alert if condition true, else accept

   If text contains "Delete", call dismiss() to click Cancel; otherwise, call accept().

3. Final Answer:

   Alert alert = driver.switchTo().alert(); if (alert.getText().contains("Delete")) { alert.dismiss(); } else { alert.accept(); } -> Option C

4. Quick Check:

   Use contains() and dismiss() for conditional cancel [OK]

Hint: Use getText().contains() before dismiss() or accept() [OK]

Common Mistakes:

• Using == instead of contains() for string check
• Calling dismiss() before checking alert text
• Calling accept() and dismiss() both without condition