Genie 7110 manual Nokia Navigation Guidelines

3 Navigation Guidelines

In Example 3-9the goal is to allow the user to navigate backward through the data input wizard without losing data that was difficult to enter (since many devices map the clear and back functions to the same key) and without corrupting the history stack. This is accomplished by starting out with the spawn action, which enables the use of <throw> for backward navigation. In the <throw> statement for each card, the data that has already been entered is sent back (so it is not lost) and caught in the card where the user entered the name. This way, when navigating forward through the wizard, the user need not re-enter data but can modify or remove it as necessary.

A similar effect (although not quite so efficient) may be achieved with the use of the onenterbackward construction, although if data is no longer in the cache this will involve further server hits.

A card containing:

<onevent type="onenterbackward"> <prev/>

</onevent>

Will immediately call the card that originally called it, without erasing any data.

Nokia Navigation Guidelines

■Provide an action or link on every card.

Every card should define either a link or an action bound to a task of

<do type="accept">, <do type="options">, or <do type="prev">. Generally, links should be used as a mechanism for forward navigation.

Example 3-10

Nokia 7110 Browser

------ Contacts-------		Options items:
Last name: Smith		Edit
First name:		Find
Andrew
City & State: San
Options	Back

Diego, CA

Zip:

Phone:

Email:

<do type="accept" label="Edit"> <go href="edit.wml"/>

</do>

<do type="options" label="Find"> <go href="find.wml/>

</do>

In Example 3-10,the <do type="accept"> task calls edit.wml, and the

<do type="options"> task calls find.wml. On the Nokia 7110 browser, Edit and Find are accessible from the Options softkey.

22 Genie Application Style Guide February 2001