Can you highlight a polygon in a kml file when you hover over it?

I have never done that with polygons, but I bet the concept is the same as with the other geometries.

Add a Creator to create one feature. Join it with a KMLStyler and create the normal style. After that, create the "kml_id" attribute for that feature and give it a name like "normal_style" or whatever you like.

Add another Creator to create a single feature. Join it with a KMLStyler and create the hover style. Give it a unique "kml_id" like "hover_style".

Add a third Creator and join it with an AttributeCreator. You need to create three new attributes for that feature:

• kml_style_url_normal: #normal_style (or the name you have chosen with a # symbol)
• kml_style_url_highlight: #hover_style (or the name you have chosen with a # symbol)
• kml_id: feature_styles (or the name you like, without the # this time)

Add your KML Writer. In that Writer create the Style feature type. You have to expose the "kml_id" in the Format Attributes tab of that feature type. You have to join the first two features created to this feature type.

Add another feature type to the same writer. In this case is called StyleMap. In the Format Attributes tab of that feature type yo need to expose "kml_id", "kml_style_url_normal" and "kml_style_url_highlight". You have to join the third feature created to this feature type.

Then you read your source polygons and with an AttributeManager or similar you have to create the attribute "kml_style_url" with the value "#feature_styles" (or the name you have chosen with the #).

Add a thrid feature type to your KML Writer. This time you use the name you want. You need to expose the "kml_style_url" in the Format Attributes of that new feature type. Join the polygons with that feature type and run it.

This is way more simple visually, so I will try to make time later this day to build a workspace to share with you.

Thank you for your explanation and example, will see what i can come up with.

A couple of issues:

The kml_style_url value has to be "#feature_styles".

Another problem was that your source polygons already had a colour defined and it seems the KMLStyler can't override them. I have expose fme_color and fme_fill_color and delete them. I find that a bit weird. Could that be a bug?

About that other question you have with the colour of the balloon I have never done anything like that. I have checked and there is a property called kml_balloon_color. I would try setting a value for that in your AttributeCreator_3 and see what happens. There is also a kml_balloonstyle_bgcolor.