Nokia SERIES 40 - Page 19

WAP Service Developer's Guide for Nokia Series 40
Version 1.0
Copyright © 2002. Nokia Corporation. All rights reserved.
19
4.5.1 Prev task
The author of the WAP service is always responsible for the working navigation
model within its own service. If there is a need for back functionality, it should be
explicitly defined with the <prev> type <do> element. The WAP browser does not
have any implicit back functionality.
4.5.2 Card-wide and deck-wide scope
The do element can be expressed in two ways: in card-wide scope or in deck-wide
scope in a template. Do elements will be stored in the browser’s options list
together with the preloaded options.
Example 4-5 Deck-wide backward navigation, prev
<template>
<do type="prev" label="Back">
<prev/>
</do>
</template>
Example 4-6 Card-wide backward navigation
<do type="prev" label="Back"
<prev/>
</do>
Example 4-7 Do element
<wml>
<template>
<do name="help-button" type="options" label="Ask Help">
<go href="http://.../help.wml" method="get"/>
</do>
<do type="options" label="Contact">
<go href="http://.../contact.wml" method="get"
sendreferer="false"/>
</do>
<do type="prev" optional="false">
<prev/>
</do>
</template>
<card id="card1" title="Homepage" ordered="true">
<p align="left">
Please, register
<br/>
Username:
<input name="username" type="text" title="Username"
emptyok="false"/>
Password: