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JavaScript has three kind of popup boxes: Alert box, Confirm box, and Prompt box.
An alert box is often used if you want to make sure information comes through to the user.
When an alert box pops up, the user will have to click "OK" to proceed.
Use window.alert() or alert() method to display the alert box.
alert("This is simple alert box!");
A confirm box is often used if you want the user to verify or accept something.
When a confirm box pops up, the user will have to click either "OK" or "Cancel" to proceed.
If the user clicks "OK", the box returns true. If the user clicks "Cancel", the box returns false.
Use window.confirm() or confirm() method to display the confirm box.
let choice = confirm("Are you sure you want to delete this item?");
let txt;
if (choice) {
txt = "You pressed OK! Item deleted";
} else {
txt = "You pressed Cancel! Item not deleted";
}
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.
Use window.prompt() or prompt() method to display the prompt box.
let name = prompt("Please enter your name", "Harry Potter");
let text;
if (person == null || person == "") {
text = "User cancelled the prompt.";
} else {
text = "Hello " + person + "! How are you today?";
}
To display line breaks inside a popup box, use a back-slash followed by the character n.
alert("Hello\nHow are you?");
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