This tutorial shows you how to use javascript popup window to alert a message box.

JavaScript provides various integration functions for displaying messages for different purposes, for example to display a simple message or display a message and receive the user's confirmation.

Alert Box

The Alert box lets you display a message, similar message box in the windows forms

alert("Welcome to c-sharpcode.com !");

Confirm Box

The confirm box allows you to display a confirmation message, similar confirmation message box in the windows forms

if (confirm("Are you sure want to delete this record?") == true) {
    //delete
} else {
    //cancel
}

Prompt Box

The Prompt Box allows you to enter a value, then you can get the return value from the prompt box

var value = prompt("Please enter a text", "c-sharpcode");    
if (value != null) {
    alert(value);
}