(Wireless Markup Language Script) is the client-side scripting
language of WML (Wireless Markup Language). A scripting language is
similar to a programming language, but is of lighter weight. With
WMLScript, the wireless device can do some of the processing and
computation. This reduces the number of requests and responses
to/from the server. In the old days, fewer round-trips can improve
the performance of your WAP site significantly since data
transmission over wireless networks is slow. Today, the performance
gained may not be so significant any more as data transmission speed
has improved a lot. However, you may still find WMLScript useful
since putting some operations at the client-side can reduce the load
of your servers.
is based on ECMAScript (European Computer Manufacturers Association
to learn WMLScript quickly. You may glance through or even skip some
parts of this WMLScript tutorial.
code can be embedded in the HTML markup, whereas WMLScript code is
always placed in a file separated from the WML markup. URLs are used
to refer to the actual WMLScript code in the WML document.
has a number of standard libraries. They contain a lot of useful
functions that you should get familiar with. We will talk about them
in later parts of this WMLScript tutorial.
common use of WMLScript is to validate form data. Another common use
is to display message boxes to give alerts and error messages or to
ask for confirmation of actions (no round-trip is needed for showing
message boxes, which helps save bandwidth and improve the WAP
application's response time).
1.2. WMLScript MIME Type
and File Extension
files have the extension ".wmls". The MIME type is
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