Explore your understanding of Bootstrap forms with questions covering validation mechanisms, input types, and responsive form layouts. Assess your knowledge of best practices and key features for creating effective, user-friendly web forms using Bootstrap.
If you want to visually indicate a valid field after a successful user input, which Bootstrap utility class should you add to the input element?
Explanation: The 'is-valid' class is designed to highlight inputs as valid after successful validation in Bootstrap. The other options, 'valid-input', 'input-valid', and 'form-control-check', are not recognized by Bootstrap and will not provide the visual feedback expected for validation states. While these distractors sound plausible, only 'is-valid' produces the intended validation effect.
To ensure mobile users see an appropriate keyboard for entering an email in a Bootstrap form, which input type should you choose for the email field?
Explanation: Setting the input type to 'email' prompts browsers to show a keyboard optimized for email address entry, improving user experience. The 'text' type is generic and does not offer any specialized keyboard. 'mail' and 'input-email' are not valid HTML input types and have no effect. Therefore, 'email' is the most suitable and correct option.
When designing a form that adapts from a single-column on small screens to a multi-column layout on larger screens, which Bootstrap component should you primarily use?
Explanation: The grid system in Bootstrap allows for responsive designs that adjust the layout of forms across different screen sizes by organizing elements in columns and rows. 'Flextable' is not a Bootstrap component and would not aid in this scenario. 'Modal form' describes a display method, not a layout approach. 'Pagination' is used for navigation, unrelated to form structure. Thus, the grid system is the ideal choice.
Which Bootstrap class should you apply to a feedback message element to display invalid feedback below a form control when validation fails?
Explanation: 'invalid-feedback' is the prescribed class in Bootstrap for showing validation error messages beneath form controls upon input failure. 'form-error', 'feedback-invalid', and 'is-error' are plausible-sounding but incorrect, as they do not trigger the appropriate visibility or styling. Only 'invalid-feedback' ensures the message is properly associated and styled with the invalid input.
To create a horizontally expanding input that fills available space within a form row in Bootstrap, which utility class should be used?
Explanation: 'flex-grow-1' allows an input or element to grow and occupy remaining horizontal space within a flex container, ensuring responsive width adjustment. The option 'col-shrink' does not exist in Bootstrap, and 'expand-input' is not a recognized utility. 'w-auto' sets width automatically based on content, but does not guarantee filling the available space. 'flex-grow-1' is the only proper and effective choice.