User Interaction

In JavaScript, interacting with users is essential for creating dynamic and engaging programs. This interaction allows users to input data, make choices, and influence the behavior of the program.

In this course, we'll primarily focus on using dialog boxes for user interaction. Dialog boxes provide a simple way to prompt users for input or decisions within a program. While they're not commonly used in modern web applications, they offer a straightforward approach for communication, especially in educational settings.

By utilizing dialog boxes, we can simulate user interaction and demonstrate the fundamental concepts of handling user input and responding to user actions in JavaScript programs. Although this method may not reflect real-world application development practices, it provides a valuable learning experience for understanding the principles of user interaction in programming.

Dialog boxes are common features in web browsers, present in most versions, including older ones. They typically appear as popup or modal windows, temporarily halting interaction with the webpage until closed.

While useful for displaying important information or gathering essential user input, overusing dialog boxes can disrupt user experience. In this course, we'll explore three types of dialog boxes.

2.1 - Alert Dialog Box

• The simplest type, invoked using the alert() method.
• Displays a message and an OK button.
• Execution pauses until the user clicks OK.

2.2 - Confirm Dialog Box

• Similar to alert, but includes OK and Cancel buttons.
• Returns true if OK is clicked and false if Cancel is clicked.

Example 1

Example 2

2.3 - Prompt Dialog Box

• Extends confirm dialog with an additional text input field.
• Returns the user's input string or null if Cancel is clicked.

Example 1