topic Re: FeatureLayer from FeatureCollection in ArcGIS JavaScript Maps SDK Questions

FeatureLayer from FeatureCollection

LefterisKoumis — Wed, 16 Dec 2015 01:53:17 GMT

I get the Converting circular structure to JSON error when I create the feature layer, thislayer. Any ideas? Thank you..

var requestHandle = esriRequest({

"url": myurl, //I set the variable to a featureservice url

"content": {

"f": "json"

"callbackParamName": "callback"

});

myfields =requestHandle.then(this.requestSucceeded, this.requestFailed);

var layerDefinition = {

"geometryType": "esriGeometryPoint",

"fields": myfields,

"objectIdField": "OBJECTID",

}

var featureCollection = {

layerDefinition: layerDefinition,

featureSet: myfeatureSet //it's derived from a query

};

var thislayer = new esri.layers.FeatureLayer(featureCollection, {

id: "query layer",

mode: FeatureLayer.MODE_SNAPSHOT,

outFields:["*"]}

);

this._openResultInAttributeTable(thislayer);

requestSucceeded:function(response, io){

fields = array.map(response.fields);

return fields;

requestFailed: function(error, io){

console.log("got an error");

Re: FeatureLayer from FeatureCollection

LefterisKoumis — Thu, 17 Dec 2015 20:15:17 GMT

I modified it but still get the same error.

mapServiceUrl= <map service>;

var requestHandle = esriRequest({

"url": dojo.replace("{0}/layers",[mapServiceUrl]),

"content": {

"f": "json"

"callbackParamName": "callback"

});

requestHandle.then(lang.hitch(this, function(response){

dojo.forEach(response.layers, function(layerInfo) {

console.log(layerInfo); //checking layer name

if(layerInfo.fields) {

dojo.forEach(layerInfo.fields, function(fieldInfo) {

console.log(fieldInfo); //checking fields

});

}

myfields =layerInfo.fields;

});

}));

var featureCollection = {

"layerDefinition": null,

"featureSet": {

"features": [],

"geometryType": "esriGeometryPoint"

}

};

layerDefinition = {

"geometryType": "esriGeometryPoint",

"objectIdField": "ObjectID",

"field": [myfields]

};

var featureCollection = {

layerDefinition: layerDefinition,

featureSet: featureSet

};

var thislayer = new esri.layers.FeatureLayer(featureCollection);

Re: FeatureLayer from FeatureCollection

RobertScheitlin__GISP — Fri, 10 Dec 2021 23:23:19 GMT

Lefteris,

Something more like this:

var mapServiceUrl = "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_LandRecords_Louisville/MapServer/2" ;
var thislayer = null, featureCollection = null;
esriRequest({
  url: mapServiceUrl,
  content: {
    f: 'json'
  },
  handleAs: 'json',
  callbackParamName: 'callback'
}).then(lang.hitch(this, function (layerInfo) {
  featureCollection = {
    layerDefinition: layerInfo,
    featureSet: null
  };
  thislayer = new FeatureLayer(featureCollection);
}));

Re: FeatureLayer from FeatureCollection

LefterisKoumis — Thu, 17 Dec 2015 21:44:08 GMT

Thank you.

It seems that the featureSet was causing the error. But how do I define the new layer based on the query selection. By defining the featureSet: null then the selection is null.

Also, when I pass on thislayer to the _openResultInAttributeTable function, I get the error that it cannot read the 'name' of undefined even though the currentlayer is not null!

_openResultInAttributeTable: function (currentLayer) {

var aLayer = {

layerObject: currentLayer,

title: currentLayer.name,

id: currentLayer.id,

getLayerObject: function () {

var def = new Deferred();

if (this.layerObject) {

def.resolve(this.layerObject);

} else {

def.reject("layerObject is null");

------------

---------

Re: FeatureLayer from FeatureCollection

RobertScheitlin__GISP — Fri, 10 Dec 2021 23:23:21 GMT

Lefteris,

The code provided in my last reply will setup the FeatureLayer (only the shell) for you then you have to add features to it (as I do in the eSearch). The name is null because you have not defined it yet. you should notice that I set several properties to the layerInfo once I receive it:

layerInfo.name = this.nls.search + ' ' + this.nls.results + ': ' + layerConfig.name;
layerInfo._titleForLegend = layerInfo.name;
layerInfo.minScale = 0;
layerInfo.maxScale = 0;
layerInfo.effectiveMinScale = 0;
layerInfo.effectiveMaxScale = 0;
layerInfo.defaultVisibility = true;

Re: FeatureLayer from FeatureCollection

LefterisKoumis — Fri, 18 Dec 2015 05:19:21 GMT

Sorry to drag it on, but it is confusing. Why do I need to assign a name to the layerinfo when it already has it?

I verified it by using the code below. So by declaring

layerDefinition: layerInfo,

in the featurecollection the name should be passed on as well since I will use the same layerinfo for the new featurelayer as the myurl. However it is not passed on when a featurelayer is created using that feature collection. What am I missing here? Thank you for your patience.

esriRequest({

url: myurl,

content: {

f: 'json'

handleAs: 'json',

callbackParamName: 'callback'

}).then(lang.hitch(this, function (layerInfo) {

console.log(layerInfo.name); //name is printed in console

}

Re: FeatureLayer from FeatureCollection

RobertScheitlin__GISP — Fri, 18 Dec 2015 12:59:19 GMT

Lefteris,

I really have no idea then. As always working with portions of code is difficult as I have to assume how you are handling other parts.

Re: FeatureLayer from FeatureCollection

LefterisKoumis — Fri, 18 Dec 2015 18:03:59 GMT

Ok. I didn't want to post a long script. I will create a smaller version of it and test it again. If still has problems, I will post it Thank you for your commitment helping others.

Re: FeatureLayer from FeatureCollection

RobertScheitlin__GISP — Fri, 18 Dec 2015 18:10:47 GMT

Lefteris,

You can always zip the widget and then attach the zip using the advanced editor.

Re: FeatureLayer from FeatureCollection

LefterisKoumis — Mon, 21 Dec 2015 19:01:06 GMT

Ok. Here you go.

The ultimate goal is to pass on the thislayer to the _openResultInAttributeTable so it can publish the table with the query results. As you can see from the line 276, the layer has the layer name, however the _openResultInAttributeTable cannot access it. The second issue is how to pass on the featureSet of the quesry results to the feature collection. When I including it it causes the Converting circular structure to JSON error.

Thank you.

Re: FeatureLayer from FeatureCollection

RobertScheitlin__GISP — Mon, 21 Dec 2015 21:06:00 GMT

Lefteris,

Your code was a mess. You need to spend more time cleaning up your code so you don't get confused in there. Here is a pretty clean working version.

Re: FeatureLayer from FeatureCollection

LefterisKoumis — Mon, 21 Dec 2015 23:14:21 GMT

yes, i agree. Thank you for you kind words and your time. I have an observation. The selectInBuffer is called twice, creating two tabs on the Attribute table, one is with the field names and one one without it.

Thank you again.

Re: FeatureLayer from FeatureCollection

RobertScheitlin__GISP — Mon, 21 Dec 2015 23:51:29 GMT

Lefteris,

I have tested the exact code that I provided you several more times and it only opens one tab.

Re: FeatureLayer from FeatureCollection

LefterisKoumis — Tue, 22 Dec 2015 00:36:48 GMT

I just copied the code you gave me and I got this. This is bizarre. One of the screenshot (see below), shows the first tab with the field names and the second tab without the field names. So, I placed in the "theselectInBuffer" a console.log and it was called twice, and hence calling the attribute table twice.

selectInBuffer: function (results) {

array.map(results, lang.hitch(this, function(feature){

this.thelayer.add(feature);

}));

console.log("sign1");

this._openResultInAttributeTable(this.thelayer);

output:

Re: FeatureLayer from FeatureCollection

RobertScheitlin__GISP — Tue, 22 Dec 2015 01:04:33 GMT

Lefteris,

That is bizarre. I added a console.info to the selectInBuffer function as well and it is only called once. It must be in how you are using the widget in your app. Do you accidentally have it added twice in the config.json or something?

Re: FeatureLayer from FeatureCollection

LefterisKoumis — Tue, 22 Dec 2015 17:17:23 GMT

That was it. Thank you.