[GIS] OpenLayers: add a listener to a single polygon

Question

I want to add a listener to a single polygon. Currently, I am trying to add one that makes a polygon opaque when you click on it, but I should be able to add any general listener. OpenLayers.Layer has an events property, but there is no such property for OpenLayers.Feature or OpenLayers.Geometry.Polygon.

This is my setup:

• An OpenLayers.Layer.Vector layer, pLayer, called "polygon layer" that contains all of the polygons.
• A function handleClick that sets this.style.fillOpacity = 1. this is supposed to refer to the polygon clicked on

• For each polygon, I call:

  pLayer.events.register('click', polygon, handleClick);
  

The issue with this setup is that when I click on any of the polygons, it fires the event for all polygons on that layer and every polygon becomes opaque. How do I make it so that the event only fires for individual polygons?

I need this to be general. Basically, I want to be able to add any type of listener to a single polygon. My overall goal is to create an interface between Google Maps and OpenLayers, and I Google Maps you can add an event to a single polygon.

Will I need to put every polygon on a separate layer? If that is the case, how do I set up the renderer for each of those polygon layers? Or is there a way to keep all polygons in the same layer and have the event handle each of them individually?

Answer 1

Use SelectFeature to handle the clicks for individual features.

Here's an example: http://openlayers.org/dev/examples/select-feature.html