topic Re: Clearing Feature Layer in ArcGIS JavaScript Maps SDK Questions

Clearing Feature Layer

jaykapalczynski — Fri, 05 Dec 2014 19:28:29 GMT

I am populating a Feature Layer with the spatial features contained withing a Shapefile.

Attached is a snip of that code: In that code I am assigning the shapefile to the Feature Layer "featureLayerSF"

Everything works fine and I can add the shapefiles. Although in my case I only want to have one shapefile added at a time.

My question is how do I remove the data inside "featureLayerSF" before the newly chosen shapefile spatial contents are added to the "featureLayerSF"

Any ideas would be very appreciated. Or code snips....

Re: Clearing Feature Layer

HeikoHeijenga — Fri, 05 Dec 2014 19:40:36 GMT

Looking at your code snippet it seems like every time you add a Shapefile you create and add a new layer to the map. If you only want to show the last added Shapefile you should remove the previously added layer.

Re: Clearing Feature Layer

jaykapalczynski — Fri, 05 Dec 2014 19:55:25 GMT

I tried this : app.map.removeAllLayers()

But it removed all my layers including my base map etc....I dont know the index of the layer I am trying to remove....

OR CAN i look for the name of the layer (featureLayerSF) : "var featureLayerSF = new FeatureLayer(layer, {"

Re: Clearing Feature Layer

jaykapalczynski — Fri, 05 Dec 2014 20:02:47 GMT

I tried the below: trying to removeLayer but this does not work it keeps adding to the layer

arrayUtils.forEach(featureCollection.layers, function (layer) {

var infoTemplateSF = new InfoTemplate("Details", "${*}");

var featureLayerSF = new FeatureLayer(layer, {

infoTemplate: infoTemplateSF

});

//associate the feature with the popup on click to enable highlight and zoom to

featureLayerSF.on('click', function (event) {

app.map.infoWindow.setFeatures([event.graphic]);

});

//change default symbol if desired. Comment this out and the layer will draw with the default symbology

changeRenderer(featureLayerSF);

fullExtent = fullExtent ?

fullExtent.union(featureLayerSF.fullExtent) : featureLayerSF.fullExtent;

app.map.removeLayer(featureLayerSF)

layers.push(featureLayerSF);

});

Re: Clearing Feature Layer

HeikoHeijenga — Fri, 05 Dec 2014 20:12:05 GMT

Store the layers you create in a (global) array:

...

allShapeFileLayers = [];

...

function addShapefileToMap(featureCollection) {

var fullExtent;

var layers = [];

arrayUtils.forEach(allShapeFileLayers, function(layer) {

map.removeLayer(layer);

});

arrayUtils.forEach(featureCollection.layers, function(layer) {

var infoTemplateSF = new InfoTemplate("Details", "${*}");

var featureLayerSF = new FeatureLayer(layer, {

infoTemplate: infoTemplateSF

});

//associate the feature with the popup on click to enable highlight and zoom to

featureLayerSF.on('click', function(event) {

app.map.infoWindow.setFeatures([event.graphic]);

});

//change default symbol if desired. Comment this out and the layer will draw with the default symbology

changeRenderer(featureLayerSF);

fullExtent = fullExtent ?

fullExtent.union(featureLayerSF.fullExtent) : featureLayerSF.fullExtent;

layers.push(featureLayerSF);

});

allShapeFileLayers = layers;

app.map.addLayers(layers);

app.map.setExtent(fullExtent.expand(1.25), true);

dom.byId('upload-status').innerHTML = "";

}

Re: Clearing Feature Layer

jaykapalczynski — Fri, 05 Dec 2014 20:38:16 GMT

Fantastic,.....thanks a million cheers.