JavaScript document.getElement Method
The `document.getElementById()` method retrieves the element with the
specified ID.
In the previous page, we used `document.form1.name.value` to get the value of
the input field. Alternatively, we can use the `document.getElementById()`
method to retrieve the input value, but we must first define an ID for the
input field.
Example
Here is a simple example of the `document.getElementById()` method that prints
the cube of a given number.
<Script>
function cubeNumber() {
var num =
document.getElementById("number").value;
num = parseInt(num);
var cube = num * num * num;
document.getElementById("result").innerHTML = "Cube of " + num + " is: " + cube;
}
</Script>
Output:
Enter a number: 5
Cube of 5 is: 125
