topic Re: Expand tree nodes to liveMapwidget in ArcGIS JavaScript Maps SDK Questions

Exand tree nodes to liveMapwidget

RashaGarfinkel — Thu, 19 Apr 2012 14:01:19 GMT

I am trying to add the name of the features under each of the feature layer names - make the tree one level deeper & the features should be selected based on their map visibility - How do I get the features from the feature layer & add them as items to the tree?

Re: Exand tree nodes to liveMapwidget

derekswingley1 — Thu, 19 Apr 2012 14:45:50 GMT

What is the "liveMapWidget"?

Re: Expand tree nodes to liveMapwidget

RashaGarfinkel — Thu, 19 Apr 2012 15:19:21 GMT

What is the "liveMapWidget"?

It's one of the widgets that displays a tree like structure of layer name & feature layer name - basically I want to add the name of the visible idividual features under the feature layer name list
so far I loop through the layers & when I get a sublayer(featrue layer) I try doing the IdentifyTask to get the features but none come back?

Re: Expand tree nodes to liveMapwidget

derekswingley1 — Thu, 19 Apr 2012 15:52:41 GMT

It's one of the widgets that displays a tree like structure of layer name & feature layer name - basically I want to add the name of the visible idividual features under the feature layer name list
so far I loop through the layers & when I get a sublayer(featrue layer) I try doing the IdentifyTask to get the features but none come back?

I should have been more specific...we don't have anything in the API called a "liveMapWidget". Where did the liveMapWidget come from? Who wrote it? You're best bet is to reach out to the developer of the widget.

Re: Expand tree nodes to liveMapwidget

RashaGarfinkel — Thu, 19 Apr 2012 16:15:16 GMT

I should have been more specific...we don't have anything in the API called a "liveMapWidget". Where did the liveMapWidget come from? Who wrote it? You're best bet is to reach out to the developer of the widget.

I was using that widget thinking that it is known since I am new to this - its a UI tree that displays maplayers & feature layers based on their visibility on the map
so to rephrase my question if I have code to get the layers from the map:
for(var i = this.map.layerIds.length - 1; i >= 0; i--){
var layerId = this.map.layerIds;
var layer = this.map.getLayer(layerId);
}
how would I get the inidividual features of the given layer?

Re: Expand tree nodes to liveMapwidget

derekswingley1 — Thu, 19 Apr 2012 18:59:31 GMT

I was using that widget thinking that it is known since I am new to this - its a UI tree that displays maplayers & feature layers based on their visibility on the map
so to rephrase my question if I have code to get the layers from the map:
for(var i = this.map.layerIds.length - 1; i >= 0; i--){
var layerId = this.map.layerIds;
var layer = this.map.getLayer(layerId);
}
how would I get the inidividual features of the given layer?

Check the layer's declaredClass property. If it's esri.layers.GraphicsLayer or esri.layers.FeatureLayer then you can access the layer's features via layer.graphics.

Re: Expand tree nodes to liveMapwidget

RashaGarfinkel — Thu, 19 Apr 2012 19:21:58 GMT

Check the layer's declaredClass property. If it's esri.layers.GraphicsLayer or esri.layers.FeatureLayer then you can access the layer's features via layer.graphics.

Its saying that its a esri.layers.ArcGISDynamicMapServiceLayer - would you know how I can accesss its features

Re: Expand tree nodes to liveMapwidget

derekswingley1 — Thu, 19 Apr 2012 19:40:49 GMT

Its saying that its a esri.layers.ArcGISDynamicMapServiceLayer - would you know how I can accesss its features

Dynamic map service layers consist of single image created on the fly as requested by a client. If you want info about features, you have to make a request to the server. The easiest way to do this is with a queryTask.

Re: Exand tree nodes to liveMapwidget

JeffPace — Fri, 20 Apr 2012 13:45:22 GMT

Are you using the JS Sample Viewer? It contains a livemapswidget

if so, the name (label) in the tree comes from the config.xml file

<livemaps>
<mapservice label="Community Redevelopment Areas" type="dynamic" visible="false" alpha="0.6">http://www.mymanatee.org/arcgis/rest/services/community-services/cra/MapServer</mapservice>

Re: Expand tree nodes to liveMapwidget

RashaGarfinkel — Mon, 23 Apr 2012 14:19:18 GMT

Dynamic map service layers consist of single image created on the fly as requested by a client. If you want info about features, you have to make a request to the server. The easiest way to do this is with a queryTask.

I had tried queryTask - I am not even getting into the call back - not sure what is wrong with my query - here it is:
getFeatures: function(){
var queryTask = new esri.tasks.QueryTask(sublayeritem.url);
                                        var queryP = new esri.tasks.Query();
                                        queryP.returnGeometry = true;
                                        queryP.outFields = ["*"];
                                        queryP.outSpatialReference = this.map.spatialReference;
                                        queryTask.execute(queryP, dojo.hitch(this, "resultCallback"));

},

resultCallback: function(featureSet) {
}

Re: Expand tree nodes to liveMapwidget

JeffPace — Mon, 23 Apr 2012 15:29:22 GMT

I had tried queryTask - I am not even getting into the call back - not sure what is wrong with my query - here it is:
getFeatures: function(){
var queryTask = new esri.tasks.QueryTask(sublayeritem.url);
                                        var queryP = new esri.tasks.Query();
                                        queryP.returnGeometry = true;
                                        queryP.outFields = ["*"];
                                        queryP.outSpatialReference = this.map.spatialReference;
                                        queryTask.execute(queryP, dojo.hitch(this, "resultCallback"));

},

resultCallback: function(featureSet) {
}

do you see the query (as a GET or POST) in firebug?

Re: Expand tree nodes to liveMapwidget

RashaGarfinkel — Mon, 23 Apr 2012 16:44:51 GMT

do you see the query (as a GET or POST) in firebug?

I must have had something wrong in the query but it seems to be working now - I get back the featureset for the layer - how do I add it as a child to the layer node on the tree - can it be called synchronously - since I want to be able to loop through each layer & query its features?