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Important Web Design and Development Short Questions

Chapter: 44
Question 1:
What does the validateForm function in the provided JavaScript example do?
Answer: The validateForm function checks if the "name" field is empty or if the "age" field contains a negative value. If either condition is not met, it displays an alert message and prevents the form from being submitted.
Chapter: 44
Question 2:
What is the main benefit of using JavaServer Faces (JSF) for web applications?
Answer: JSF simplifies building web application UIs by providing a higher-level framework for UI components, state management, event handling, input validation, data binding, and page navigation. It combines features of other frameworks like Swing and Struts for ease of use.
Chapter: 44
Question 3:
Describe one key difference between Struts and JavaServer Faces (JSF).
Answer: Struts is Java-centric and adds complexity without providing UI tags, whereas JSF offers a comprehensive component model for UI development, including event handling and component rendering, which simplifies the development process compared to Struts.
Chapter: 44
Question 4:
How does JSF handle user actions on a web page?
Answer: JSF applications are event-driven, meaning user actions trigger events that are processed by event listeners. For instance, clicking a button triggers an event that is handled by an associated actionListener, which determines the subsequent actions or page navigation.
Chapter: 44
Question 5:
What is the role of validators in JSF?
Answer: Validators in JSF are used to simplify input validation by checking if the data entered by users meets specific criteria. They save developers from writing custom validation code and include built-in options like DoubleRangeValidator and LengthValidator.
Chapter: 44
Question 6:
What is a managed bean in JSF, and what is its purpose?
Answer: A managed bean in JSF is a JavaBean defined in a configuration file, used to manage data and business logic in JSF applications. It acts as a bridge between the user interface and the backend, holding data from JSF components and handling events.
Chapter: 44
Question 7:
Explain the concept of value binding in JSF.
Answer: Value binding in JSF allows for automatic instantiation of JavaBeans and placing them in request or session scope. It also enables overriding default values through accessor methods, facilitating dynamic data handling and component updates in the user interface.
Chapter: 44
Question 8:
How does the validateForm function handle a negative age value?
Answer: The function checks if the "age" field contains a negative value. If it does, it triggers an alert saying "Age can't be negative" and prevents the form from being submitted until the value is corrected.
Chapter: 45
Question 9:
What is the purpose of the "AddNumbers" example in JSF?
Answer: The "AddNumbers" example demonstrates the use of value and method binding expressions, managed beans, and page navigation in JavaServer Faces (JSF). It helps illustrate the capabilities of JSF in a practical context.
Chapter: 45
Question 10:
How does a web service work according to its definition by W3C?
Answer: According to W3C, a web service is a software application identified by a URI. It uses XML-based messages and internet-based protocols to interact with other software applications, allowing for service descriptions, binding, and direct interactions.