javascript dialogue box

In JavaScript, there are three main types of built-in dialogue boxes (pop-ups) you can use in the browser:

1. Alert Box (just shows a message)

alert("Hello! This is an alert box.");

Shows a simple message with an OK button.

2. Confirm Box (asks user Yes/No type choice)

let result = confirm("Do you want to continue?");
if (result) {
  console.log("User pressed OK");
} else {
  console.log("User pressed Cancel");
}

Returns true if user clicks OK, false if Cancel.

3. Prompt Box (asks user for input)

let name = prompt("What is your name?");
if (name) {
  console.log("Hello, " + name + "!");
} else {
  console.log("User did not enter a name.");
}

Returns the text entered by the user, or null if Cancel is clicked.

Example combining all:

alert("Welcome!");

let proceed = confirm("Do you want to enter your name?");
if (proceed) {
  let username = prompt("Please enter your name:");
  alert("Hello, " + username + "!");
} else {
  alert("Okay, maybe next time!");
}