HTML and CSS Reference
In-Depth Information
Figure 9.39
Output from Example 9.34.
In Chapter 8, we used the
with
keyword with user-defined objects to make it easier to
manipulate the object properties. Recall that any time you reference the object within
the block following the keyword, you can use properties and methods without the object
name. This saves a lot of typing and reduces the chances of spelling errors, especially
when the properties have long names. The
String
object is used in the following example
to demonstrate how
with
is used (see Figure 9.40).
EXAMPLE
9.35
<html>
<head><title>The with Keyword</title></head>
<body>
<h2>Using the <em>with</em> keyword</h2>
<p>
<h3>
<script type="text/javascript">
var yourname
=prompt("What is your name? ","");
//
Create a string object
1
with(yourname){
document.write("Welcome " + yourname +
" to our planet!!<br />");
2
document.write("Your name is " +
length
+
" characters in length.<br />");
3
document.write("Your name in uppercase: " +
toUpperCase()
+ ".<br />");
4
document.write("Your name in lowercase: " +
toLowerCase()
+ ".<br />");
}
</script>
</h3>
</body>
</html>
EXPLANATION
1
The
with
keyword allows the methods of an object (in this example a string ob-
ject) to be called without the object's name and a dot.
