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I have posted this question before on the general StackOverflow forum: https://stackoverflow.com/questions/16278569/select-features-of-layer-which-is-not-on-top

In short my problem is that I have a baselayer, an overlay layer and a WFS layer in OL. The base and overlay layers are WMS using GWC in GeoServer. I want to select a feature of the WFS layer but KEEP the overlay layer on top.

By binding a selectFeature control to the WFS layer moves the layer on top. Using 

map.setLayerZIndex(overlayLayer, map.Z_INDEX_BASE["Feature"]+10);

I move the overlay layer back. But now I can no longer select a feature of the WFS layer.

Adding the overlayLayer to the SelectFeature control doesn't work because it is a WMS layer.

How can I select a feature on the WFS layer which is not on top? I've tried the GetFeature control, but that requires a roundtrip to the server and I don't want.

I've made an sample of my problem at http://www.smartdakscan.nl/webapps/assen/selectFeature.html

Any help is much appreciated.

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  • I'm confused. You want to select something on the WMS layer (which is just an image), but you don't want to do a round-trip to the server to get a new image with the item selected when you select something?
    – René Wolferink
    Commented May 1, 2013 at 13:28
  • Do you want to just display information about the feature or do you also want to show it highlighted?
    – Jamie
    Commented May 1, 2013 at 13:35
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    I want the WMS layer on top. It is just a non-solid polygon with a house number (grouped layer from GeoServer). But I want to select a feature on the WFS layer. I want to highlight the feature and show its information. The selection is working OK if the WFS layer is on top, but I want the WMS layer to be on top.
    – Paul Meems
    Commented May 2, 2013 at 6:27
  • why do you want the WMS on top? being a non-solid polygon it should be visible also beneath the WFS layer (using it as a transparent image)
    – Gery
    Commented May 17, 2013 at 10:23
  • @Gery: You are right. But my non-solid WMS also has a label which falls beneath my solid WFS.
    – Paul Meems
    Commented May 18, 2013 at 11:46

1 Answer 1

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Use setLayerIndex instead setLayerZIndex which is a "private" method. Using the setLayerZIndex you simple change the z-index of the DOM elements but not the position of the layer within the map's layer stack.

Once you have ordered the layers as you want, you are right using the SelectFeature control passing the desired layer (WFS) where to select features.

Cheers.

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