how to get the list of layers in a map (map service)

Question

Hi all

I customized this sample pointing "basemap" to one of my local map services that has several layers

http://resources.esri.com/help/9.3/arcgisserver/apis/javascript/arcgis/help/jssamples_start.htm

The function getMapLayers  shows only one layer not all of them.

function getMapLayers() {
        alert(myMap.layerIds.length);
        for (var j = 0, jl = myMap.layerIds.length; j < jl; j++) {
            var currentLayer = myMap.getLayer(myMap.layerIds);
            alert("id: " + currentLayer.id + ", visible: " + currentLayer.visible + ", opacity: " + currentLayer.opacity);
        }
    }

Is there any other sample that list all the layers in  map service and  adds them to a drop down box

thanks

JoseSanchez · Answer

This code works: function buildLayerList(layer) { var infos = layer.layerInfos, info; var items = []; for (var i = 0, il = infos.length; i < il; i++) { info = infos; if (info.defaultVisibility) { visible.push(info.id); } items = "" + info.name + ""; } dojo.byId("layer_list").innerHTML = items.join(); // layer.setVisibleLayers(visible); // map.addLayer(layer); } function getMapLayers() { alert(myMap.layerIds.length); for (var j = 0, jl = myMap.layerIds.length; j < jl; j++) { var currentLayer = myMap.getLayer(myMap.layerIds); buildLayerList(currentLayer) // alert("id: " + currentLayer.id + ", visible: " + currentLayer.visible + ", opacity: " + currentLayer.opacity); } }

VinayBansal · Answer

You can also use esri.request to get all layers info, if you need to extract all the details of service.

var requestHandle = esri.request({
            "url": <MapService_URL> + "/layers",
            "content": {
                "f": "json"
            },
            "callbackParamName": "callback"
        });
    requestHandle.then(requestSucceeded, requestFailed);

function requestSucceeded(response, io) {
        
       
    }
    
    function requestFailed(response) {
      
    }

JasonZou · Answer

Here is the sample code to extract the layer info from each dynamic map service. You can easily modify to add each layer name into a dropdown list.config.layers = [];
dojo.forEach(map.layerIds, function(aLayerId) {
 var serviceLayer = map.getLayer(aLayerId);
 if ("layerInfos" in serviceLayer) {
  dojo.forEach(serviceLayer.layerInfos, function(aLayerInfo) {
   config.layers.push({
    name: aLayerInfo.name,
    mapService: serviceLayer.id,
    layerId: aLayerInfo.id
   });
  });
 }
});