Prompt Dialog Box in JavaScript
The prompt dialog box is very useful when you want to pop-up a text box to get user input. Thus it enable you to interact with the user. The user needs to fill in the field and then click OK.
Example
<html>
<head>
<script>
function functionP()
{
var x = prompt("enter anything"); // displays prompt
alert(x); // displays input value in alertbox
}
</script>
</head>
<body>
<button value="Back" onclick="functionP()">
Click Here
</button>
</body>
</html>
Output
