See this example
http://www.openlayers.org/dev/examples/stylemap.html
Where with StyleMap you can change the style on the fly through a
function, where this function is bound to a certain attribute, for example:
var defaultTemplate = {
fillColor : "${getStyleColor}",
fillOpacity : 0.5,
strokeColor : "${getStyleColor}",
strokeOpacity : 1,
strokeWidth : 2,
pointRadius : 4,
label : "${getName}"
};
getStyleColor = function(feature) {
if (feature.x) return "red"
else if (feature.y) return "blue";
}
var customStyleMap = new OpenLayers.StyleMap({
"default": new OpenLayers.Style(defaultTemplate, {context: context}),
"select": new OpenLayers.Style({
strokeColor: "red",
strokeOpacity : 1
})
});
Ken wrote:
Doing some brain storming on how best to approach styling one dataset
based on the information in a database.
What we have is a polygon layer, currently a shape file displayed via
WMS, but I can convert it to whatever I need it to be.
We also have a database of information that pertains to each polygon
and that changes as new information is added. This is currently an
Access database accessible via an ODBC connection.
What I would like to do is change the fill color of my polygons based
on the contents of the database on the fly. So whenever someone
refreshes the map it will go to the database and use the data there to
determine what colors the polygons should be.
Thoughts on best approach?
Thanks,
Ken
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