[OpenLayers-Users] Styling dynamically depending on attributes

[Paul Holthues]

Hello all,

I'm struggling with styling features depending on some attributes
defined on the feature.

I have a two level distinction:

feature.data.featureType (Which determines type icon (a tree, little man, etc.)
feature.data.featureImportance (Which which subicon to show (a greyed
out tree, a fully colored tree, a red tree, a greyed out little man,
etc.))

The featureType does not change during runtime, the importance can
change however.

I tried to use the attributes in a stylemap for the layers as follows:

[...]
externalGraphic: "images/${featureType}/${featureImportance}.png"
[...]

but the icons do not get updated on redraw of the layers.

I can think of using stylemap and using ".addUniqueValueRules". But it
would be simpler with the above approach (if it worked). Would I have
to recreate the layers for it to work? Is there a cleaner and more
straight forward way of styling this?

Thanks in advance,
Paul