JavaScript has three kind of popup boxes:
— Alert box
— Confirm box
— Prompt box.
Alert 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.
Syntax:-
window.alert("sometext");
Example:-
<html>
<body>
<p id="demo"></p>
<script>
alert("*****WARNING******");
</script>
</body>
</html>
Confirm 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.
Syntax:-
window.confirm("sometext");
<html>
<body>
<p id="demo"></p>
<script>
confirm("Are You Sure To Delete This Item?? ");
</script>
</body>
</html>
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");
Example:-
<html>
<body>
<script>
var x=parseInt(prompt("Enter First Number:"));
var y=parseInt(prompt("Enter Second Number:"));
var z= x+y;
document.write("Your Result: "+ z);
</script>
</body>
</html>
