Filter
Top Products
Forum.Nokia.com
4.3.6 Use of do elements
Always use descriptive and short labels for all do elements. Favor local do elements instead of
anchored links that are totally out of context. Always include the prev element in each card to enable
backward navigation.
4.4 Pictures, Tables, and Color
4.4.1 Avoid Useless Images
Downloading images takes time, and many users may switch off the loading of images for more
speed. Try to optimise the size of images. If you have large images on your site, consider using
thumbnails for the image index.
Always provide an alternative text (using the ALT attribute of the IMG element) for images that convey
information. Always use a null alternative text (ALT=””) for images, which do not convey information,
or are used for page layout or decorative purposes only.
4.4.2 Use Reasonable Image Sizes
The maximum image width on the WAP browser screen is 490 pixels. Images larger than that will be
automatically scaled down to fit the screen. Using any larger images than 490 pixels is a waste of
bandwidth and will slow down the service connection. A maximum size for images downloaded
through data calls is about 60 KB although 30 KB is recommended maximum.
4.4.3 Colormap
WAP does not include any support for colors, but Nokia 9200 Communicator Series WAP browser
supports image formats with color (other than the WBMP image format).
Nokia 9200 Communicator Series supports 4096 colors. The true color is specified by 24 bits, 8 bits for
each color component (red, green, and blue). Nokia 9200 Communicator Series uses the most
significant 4 bits of each part of the color component, resulting in a color depth of 12 bits. All other
colors will either be dithered or mapped to the closest color available, depending on the application.
When creating graphics with uniform fills, use only the colors, which will not be dithered. Some image
processing tools may be able to reduce the size of images if you restrict the number of colors to the
exact 4096 colors supported by Nokia 9200 Communicator Series.
Do not use colors, which are too close to each other (colors that differ only in the least significant four
bits of each color component). This may result in the colors being mapped to the exact same color.
4.4.4 Use Reasonable Table Sizes
If the table size exceeds the maximum width of the WAP services application screen due to the
number of columns, the horizontal scroll bar will appear. Anyhow, to keep the cell content readable,
special attention should be paid on table structuring.
4.5 Use of Card Titles and Element Labels
Card titles describe the content of the display and their use is recommended. They help the user to
navigate because they function as a reminder of where the user is in the application. The header text
should be determined by the item previously selected by the user. For instance, the card title
‘Bookmarks’ tells the user that the display contains a list of bookmarks in the application and that the
options item previously selected was Bookmarks.
WAP Service Developer’s Guide for Nokia 9200 Communicator Series
23