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setDefinitionExpression will work in custom feature layer

mohannainar1

Hi,

I have created custom feature layer (polygon) , and able to add it in to the map . Now i am trying to show only few geometries , so i am using setDefinition expression but it is not working . Its shows all the features on the Map. Will this method work in custom feature layer ?

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Accepted answers

rscheitlin

Mohan,

So the only way is to maintain a master array of all graphics and when you want to show just a subset of those based on an attribute you just clear your featureLayer and only add in the ones you need based on the attribute value. When you do not need a subset you just add the the graphics back in from the master graphics array.

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mohannainar1

Thanks for the information Robert. Actually I am creating a layer with temporal data dynamically . The temporal information(population and Year) will come from the business table which is residing on some database(teradata) and spatial data coming from other data base. So i am joining spatial and business data and creating new feature layer (dynamically) . So my final layer(dynamic) will be look like below.

shape state_name population(coming from business table) year(coming from business table)

polygon TamilNadu 20000000 1990

polygon TamilNadu 30000000 1995

polygon TamilNadu 50000000 2000

I could not able to use esri time slider , because it says time property should be enabled in the map service . But in may case i am creating the custom dynamic layer so i could not able to use esri time slider.

So i am using dijit horizontalslider , based on the year selection in time slider i need to display corresponding geometry on the Map . So i thought of using setdefinition expression to filter out only the required year . But as you mentioned that also limitation in dynamic layer . Is there any approach to solve this issue or any suggestion .

rscheitlin

Mohan,

OK, I see you are not extending the FeatureLayer class, you are just using it. When creating a FeatureLayer from a FeatureCollection you are limited in the several ways (as outlined in the help). One of which is this:

Does not support queries that need to be performed on the server, e.g. queries with a where clause or non-extent based spatial queries.

So setDefinitionExpression is a affected by this limitation.

mohannainar1

Hi Robert,

PFB code for the dynamic feature layer creation and DefinitiomExpression?

CreateFeatureLayer : function (featureset) {
var len = featureset.features.length;
var attributeObj = null;
var longi = null;
var lat =null;
var pt = null;
var feature =null;
var jsonFS = new Object();
jsonFS.geometryType = "esriGeometryPoint";

if (featureset.geometryType === 'esriGeometryPoint') {
renderer = new SimpleRenderer(new SimpleMarkerSymbol());
} else if (featureset.geometryType === 'esriGeometryMultipoint') {
renderer = new SimpleRenderer(new SimpleMarkerSymbol());
} else if (featureset.geometryType === 'esriGeometryPolyline') {
renderer = new SimpleRenderer(new SimpleLineSymbol());
} else if (featureset.geometryType === 'esriGeometryPolygon') {
renderer = new SimpleRenderer(new SimpleFillSymbol());
}
if (featureset.geometryType === 'esriGeometryPoint' || featureset.geometryType === 'esriGeometryMultipoint' || featureset.geometryType === 'esriGeometryPolyline') {
renderer.symbol.setColor(new esri.Color([0, 255, 255, 1]));
} else if (featureset.geometryType === 'esriGeometryPolygon') {
renderer.symbol.setColor(new esri.Color([0, 255, 255, 0.25]));
}
debugger;
var features = [];
var incomeData = getIncomeResult[1].split(",");
var panfromWS = getIncomeResult[0].split(",");

for (var i = 0; i < len; i++) {
panidFeature = "'" + featureset.features.attributes.pan_id + "'" ;
for (var j = 0; j < len; j++)
{
if (panidFeature == panfromWS)
{
attributeObj = new Object();
attributeObj.objectid = featureset.features.attributes.FID;
attributeObj.name = "ssssssss";
attributeObj.address = "address";
attributeObj.pan_id = featureset.features.attributes.pan_id;
attributeObj.Income = incomeData;

longi = featureset.features.geometry.x;
lat = featureset.features.geometry.y;
pt = new Point(longi,lat,this.map.spatialReference);

feature = new Object();
feature.attributes = attributeObj
feature.geometry = pt;
features.push(feature);
//break;
}
}

}
jsonFS.features = features;
var featureSet = new FeatureSet(jsonFS);
featureSet.spatialReference = featureset.spatialReference;
var infoTemplate = new InfoTemplate("${name}","NAME :${name}<br>ADDRESS :${address}<br>PAN_ID :${pan_id}<br>INCOME:${Income} Lakhs per annum");
var hsFeatureCollection = {
layerDefinition:{
"displayFieldName": "",
"geometryType": "esriGeometryPoint",
"spatialReference":
{
"latestWkid": 3857,
"wkid": 102100
},
"fields":[
{
"name": "objectid",
"type": "esriFieldTypeOID",
"alias": "objectid"
},
{
"name": "name",
"type": "esriFieldTypeString",
"alias": "name",
"length" : 50
},
{
"name": "address",
"type": "esriFieldTypeString",
"alias": "address",
"length" : 50
},
{
"name": "pan_id",
"type": "esriFieldTypeString",
"alias": "pan_id",
"length" : 255
},
{
"name": "Income",
"type": "esriFieldTypeInteger",
"alias": "Income"
},
{
"name": "shape",
"type": "esriFieldTypeGeometry",
"alias": "shape"
},
],
}, featureSet: featureSet,
"exceededTransferLimit": false
};
debugger;
var heatmapFeatureLayerOptions = {
mode: FeatureLayer.MODE_SNAPSHOT,
outFields: ["*"],
infoTemplate: infoTemplate,
id:"Income Heatmap"
};
heatMapInPutLyr = new FeatureLayer(hsFeatureCollection,heatmapFeatureLayerOptions);
var extent = graphicsUtils.graphicsExtent(featureSet.features);
this.map.setExtent(extent.expand(1.2));
heatMapInPutLyr.setDefinitionExpression("Income = 50000");
this.map.addLayer(heatMapInPutLyr);
}

Thanks,

Mohan

rscheitlin

Can you share you’re code on your extended setDefinitionExpression?

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