Bootstrap Quality Control & Assurance 3

Question 1

Which Bootstrap JavaScript method programmatically disposes of a modal instance and removes its event listeners?

Accepted Answer

Modal.getInstance().dispose()

Answer

The dispose() method tears down a Bootstrap component instance and cleans up event listeners to prevent memory leaks.

Question 2

A QA engineer tests that a Bootstrap tooltip is destroyed after navigating away. Which static method retrieves an existing tooltip instance for inspection?

Accepted Answer

Tooltip.getInstance(element)

Answer

Tooltip.getInstance(element) returns the existing Tooltip instance attached to a DOM element, or null if none exists.

Question 3

During automated testing, an assertion checks whether a Bootstrap collapse is currently expanded. Which aria attribute reflects this state?

Accepted Answer

aria-expanded

Answer

Bootstrap sets aria-expanded='true' on the trigger element when the collapse is open and 'false' when closed.

Question 4

A test script fires a click on a Bootstrap dropdown toggle but the menu does not open. The most likely QA finding is that:

Accepted Answer

Bootstrap's JavaScript bundle is not loaded or initialized

Answer

Bootstrap dropdowns rely on JavaScript to handle toggle behavior; without the JS bundle the data attributes have no effect.

Question 5

Which Bootstrap event fires immediately when a modal begins to hide, before any transition completes?

Accepted Answer

hide.bs.modal

Answer

hide.bs.modal fires at the start of the hide transition, while hidden.bs.modal fires after the transition finishes.

Bootstrap Practice Test

Bootstrap Practice Test

Bootstrap Quality Control & Assurance 3