WML Tutorial 3: Tasks and navigation-assignment and data exchange

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Tasks and navigation-assignment and data exchange
This section briefly explains the variable assignment and data submission methods for WML, which are explained in a later section.

Variable Assignment (Setvar)
Setvar assigns a value to the browser's current page variable, which can be invoked in any card in the current dock.

Related properties:

1. Name variable name, as the identity of the access variable

Example: <setvar name= $bogus value= $bear >

2. Values of value variables

Data Interchange (Postfield)
Postfield uses a URL to exchange data with a CGI.

Related properties:

The name and value of the variable used for the name & Value Exchange parameter.

Example: <postfield name= $bogus value= $bear >

An example of a comprehensive application

Example:

<?xml version= "1.0"?>
<! DOCTYPE WML public "-//wapforum//dtd WML 1.1//en" "http://www.wapforum.com/DTD/wml_1.1.xml" >
<wml>

<card id= "Start" title= "Sina WAP" >
<do type= "Accept" >
<setvar name= "mycgi" value= "/cgi-bin/count.pl" >
<go href= "$MyCGI" method= "POST" >
<postfield name= "One" value= "one One"/>
<postfield name= "Two" value= "two two"/>
</go>
</do>
<p>hello world!</p>
</card>
</wml>

The previous example is equivalent to generating a POST request for a count.pl?one= "one" &two= "two two".