[OpenLayers-Users] How to select a particular layer

[fredth]

You are right and I think it's how openlayers works. You can only do a
getInfo on visible layers. The problem is when 2 or more are visible, which
one the user want to query ? 

I got another answer by mail:
A simple way is to build a dropdown list with the layer names to set the
active layer. 
 
http://gis.ibbeck.de/ginfo/apps/OLExamples/OL26/examples/labels.html 
 
function populateLayer(aktLyr)
{
    //populate select for layers
    var theHTML = '<select id="selAktLyr" onchange="setAktLyr();">';
    for(var i=4;i<map.layers.length;i++) //exclude Google layers 0-3
    {
        theHTML += '<option value=' + i + '>' + map.layers[i].name;
    }
    document.getElementById("spanselAktLyr").innerHTML = theHTML +
'</select>';
    if(!aktLyr)
        map.aktLayer = 4;
    else
    {
        map.aktLayer = aktLyr;
    }
    document.getElementById("selAktLyr").value=map.aktLayer;
}
 
function setAktLyr()
{
    map.aktLayer = document.getElementById("selAktLyr").value;
}
 BY:Arnd Wippermann

This is what I want to do. I will try this, but I would like to know if
openlayers has this functionnality built-in.

I will come back to confirm the Arnd's solution is working.
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