topic Re: How to get the column names of a feature layer with JSAPI in ArcGIS Web AppBuilder Questions

How to get the column names of a feature layer with JSAPI

JoeMinicucci — Fri, 11 Nov 2016 18:10:46 GMT

I have a feature layer connected to a WAB map, with the following fields

OBJECTID ( type: esriFieldTypeOID , alias: OBJECTID )
LINE ( type: esriFieldTypeInteger , alias: LINE )
ROUTE ( type: esriFieldTypeInteger , alias: ROUTE )
SHAPE ( type: esriFieldTypeGeometry , alias: SHAPE )
SHAPE.STLength() ( type: esriFieldTypeDouble , alias: SHAPE.STLength() )

Utilizing the Feature Layer Object, is there any simple way to get a list of the field names? I'd rather not run a Query, but if I have to what is best way to only return 1 record with those field names?

Thank you for your time

Re: How to get the column names of a feature layer with JSAPI

RobertScheitlin__GISP — Fri, 11 Nov 2016 18:13:04 GMT

Joe,

A FeatureLayer has a fields property:

FeatureLayer (legacy) | API Reference | ArcGIS API for JavaScript 3.18 | fields

Re: How to get the column names of a feature layer with JSAPI

JoeMinicucci — Fri, 11 Nov 2016 18:29:33 GMT

I tried accessing that object, Fields is null.. here is the logic (I confirmed the selectedCenterlineUrl is corrrect):

var selectedCenterlineUrl = this.HierarchyTableCenterlineSelect[this.HierarchyTableCenterlineSelect.selectedIndex].value;
var centerlineFeatureLayer = new FeatureLayer(selectedCenterlineUrl);

centerlineFeatureLayer gets created but fields is null..Why?

Re: How to get the column names of a feature layer with JSAPI

RobertScheitlin__GISP — Sat, 11 Dec 2021 09:06:59 GMT

Joe,

Are you waiting for the FeatureLayer to load before you are checking the fields?

centerlineFeatureLayer.on("load", function(){
    console.info(centerlineFeatureLayer.fields);
});‍‍‍

Re: How to get the column names of a feature layer with JSAPI

JoeMinicucci — Fri, 11 Nov 2016 18:35:29 GMT

Robert, thank you so much. This saved me hours of frustration and produced the intended result!

Re: How to get the column names of a feature layer with JSAPI

RobertScheitlin__GISP — Fri, 11 Nov 2016 18:46:21 GMT

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