Page 214 - Web Applications (803) Class 12
P. 214
Example 3— Prompt box
In this example the function func1( ) is called and executed when the button is clicked. The prompt function
asks the user to enter a value. In case the value entered is not null (or blank left by user) the respective value
is displayed in the body of the webpage.
<html>
<script>
function func1() {
var age = prompt("Enter your Age","45");
if (age != null)
document.getElementById("d").innerHTML ="Hello! you are " + age +" years
old";
}
</script>
<body style="text-align: center;">
<h1 style="color:blue;">
Using the Prompt Box in JavaScript
</h1>
<input type="button" onclick="func1()" value="Click me!">
<p id="d"></p>
</body> </html>
Output:
Anonymous Function
A function that has no name attached to it is called an anonymous function. To define a function in JavaScript,
we typically use the function keyword followed by the function name; however, for anonymous functions, we
only use the function keyword.
An anonymous function is not accessible once it is created; rather, it is assigned to a variable as a value. The
function is always invoked (called) using the variable name. Example:
<script>
var greeting = function () {
document.write("Today is a holiday!");
};
212 Touchpad Web Applications-XII

