OpenLayers WMS feature styling

Question

I add WMS connection to openLayers, it has 127 different layers. I add one Layer which occurred to be small icons symbolizing Pictures on map. But the styling is ugly, according to the specification of layers (GetCapabilities) "Styles" is set to "Default". I want to style each icon on this WMS layer, but i cant understand how.

My sample code below:

new TileLayer({
    id             : 5,
    name           : 'test picture_1',
    visible : false,
    source  : new TileWMS({
        url     : WMSUrl,
        params  : {
            'TILED'     : true,
            'LAYERS'    : 118
        },
        transparent: 'true',
        projection : "EPSG:3057"
    }),
}),

How could i style all features (which are small icons on the map) in this layer ?

Answer 1

You can't, a WMS returns a picture of the map that has been rendered by the WMS server. If you want to style a layer in the client you have two choices:

1. request the actual data from a WFS server and style it yourself.
2. Send a SLD file to the WMS server for it to use to style the data. You can check for this option by looking for a line like: <UserDefinedSymbolization SupportSLD="1" UserLayer="1" UserStyle="1" RemoteWFS="1"/> in the getcapabilities response, you need UserStyle to not equal 0.

In both cases this will only work if the server in question supports that functionality.