Get feature count of an empty FeatureLayer and applyEdits

arahman_mdmajid

How can I add the queryFeatureCount function to a feature layer whose source is not set and will later be set? The next time this function is called again, it will have some features to delete. 

The feature layer is initialized as

polygonsFeatureLayer = new FeatureLayer({
title: "test",
objectIdField: "OBJECTID",
source: [],
renderer: {
type: "simple", // autocasts as new SimpleFillSymbol()
symbol: {
type: "simple-fill", // autocasts as new SimpleFillSymbol()
color: [255, 0, 0, 0.5],
outline: { // autocasts as new SimpleLineSymbol()
color: [255, 255, 0],
width: 3
}
}
} as any
});

In another function, I am trying to add new features to the same layer, but I need to delete the old features if there are any in the layer, so I am running the following code to do so

this.polygonsFeatureLayer.queryFeatures().then((results) => {
console.log(results);
const deleteEdits = {
deleteFeatures: results.features
};
// apply edits to the layer
this.polygonsFeatureLayer.applyEdits(deleteEdits).then((results) => {
console.log(results);
// if edits were removed
if (results.deleteFeatureResults.length > 0) {
console.log(
results.deleteFeatureResults.length,
"features have been removed"
);
}
});
});

Then when the new features are received and collected. I am running the addFeatures to add new items to the existing feature layer.

const addEdits = {
addFeatures: results.features
};
this.polygonsFeatureLayer.applyEdits(addEdits).then((results) => {
console.log(results);
// if edits were removed
if (results.addFeatureResults.length > 0) {
console.log(
results.addFeatureResults.length,
"features have been added"
);
}
});

map.add(this.polygonsFeatureLayer);

But I am getting the following errors,

[esri.views.2d.layers.FeatureLayerView2D] #resolve() Failed to resolve layer view (layer title: 'test', id: '17e720aea79-layer-28') o {name: 'featurelayerview:table-not-supported', details: {…}, message: "table feature layer can't be displayed"}

Logger.js:5 [esri.views.LayerViewManager] Failed to create layerview for layer title:'test', id:'17e720aea79-layer-28' of type 'feature'. {layer: a, error: o}

ERROR Error: Uncaught (in promise): [featurelayerview:table-not-supported]: table feature layer can't be displayed

What am I missing here?  

UndralBatsukh

The error indicates that FeatureLayer you creating is a non-spatial FeatureLayer. Meaning that graphics you are adding to the FeatureLayer does not have geometry, just attributes. Is this what you are adding? If you are then you cannot add non-spatial FeatureLayer to the map. Creating a FeatureLayer doc explains how non-spatial FeatureLayers can be used. See under Read more. 

If you are creating spatial FeatureLayer then several things to check. 

1. You can only add graphics with same geometry types. 

2. Are you graphic geometries valid? 

3. You should set the FeatureLayer.geometryType in the layer's constructor.  The codepen app sets the params required to initialize FeatureLayer. If you don't then the API will try to infer required parameters from the graphics you pass in and will fail if it cannot infer the params.