Java Reference
In-Depth Information
WMLScript also provides looping capabilities using the
for
and
while
statements. The follow-
ing code counts from 1-100 in WMLScript and updates the contents of a variable as the loop
increments:
function increment_variable(strVariableName)
{
var intCounter;
for (intCounter = 1; intCounter <= 100; intCounter++)
{
WMLBrowser.setVar(strVariableName, String.toString(intCounter));
}
}
Notice that this function demonstrates the use of two of the WMLScript Standard Libraries:
String
and
WMLBrowser
. These libraries will be introduced later in this chapter.
A
while
loop executes a block of statements until some condition becomes true. Its syntax is
as follows:
while (some_condition)
{
statements;
}
The
break
and
continue
statements are provided to control flow inside a loop. As you might
expect, encountering a
break
statement causes a loop to immediately exit. A
continue
state-
ment simply causes a loop to continue by jumping back to the loop beginning.
The Standard Libraries
Although WMLScript is a capable programming language for client-side scripting environ-
ments, it is even more powerful because of the definition and inclusion of six standard libraries
with every validated WAP browser. These libraries are
•
Lang
—This library contains a set of functions that are closely related to the WMLScript
language core. Included in this library are functions for data-type manipulation, absolute
value calculations, and random number generation.
•
Float
—The
Float
library is optional and is only supported on those clients with float-
ing-point capabilities. Typical functions provided by this library include
sqrt()
,
round()
, and
pow()
.
•
String
—The
String
library contains a set of functions for performing string operations.
Some functions included in this library are
length()
,
charAt()
,
find()
,
replace()
, and
trim()
.
