JavaScript has three kind of popup boxes: Alert box, Confirm box, and Prompt box.
alert("I am an alert box!");
window.confirm("sometext");
The window.confirm() method can be written without the window prefix.
Example #
if (confirm("Press a button!")) {
txt = "You pressed OK!";
} else {
txt = "You pressed Cancel!";
} Prompt Box #
A prompt box is often used if you want the user to input a value before entering a page.
When a prompt box pops up, the user will have to click either “OK” or “Cancel” to proceed after entering an input value.
If the user clicks “OK” the box returns the input value. If the user clicks “Cancel” the box returns null.
Syntax #
window.prompt("sometext","defaultText");
The window.prompt() method can be written without the window prefix.
Example #
var person = prompt("Please enter your name", "Harry Potter");
if (person == null || person == "") {
txt = "User cancelled the prompt.";
} else {
txt = "Hello " + person + "! How are you today?";
} alert("Hello\nHow are you?");
