topic Re: Getting feature layer attributes as object without Query using query class in ArcGIS JavaScript Maps SDK Questions

Getting feature layer attributes as object without Query using query class

Anonymous User — Mon, 13 Feb 2017 14:05:01 GMT

I know I can get feature layer attributes using Query class, but is there another way to get all attributes in a feature layer?

Re: Getting feature layer attributes as object without Query using query class

SarojThapa1 — Mon, 13 Feb 2017 15:05:37 GMT

Makiko,

Do you want to display attributes of a feature layer as a Popup Window? If yes, then check this sample out.

ArcGIS API for JavaScript Sandbox

Re: Getting feature layer attributes as object without Query using query class

RobertScheitlin__GISP — Mon, 13 Feb 2017 15:09:17 GMT

Makiko,

Hmm.. any particular reason why? The QueryTask is the main JS API route to get attribute values. The other way would be to just use a esriRequest directly to the map service to get the attribute values for a know ObjectID.

Re: Getting feature layer attributes as object without Query using query class

Anonymous User — Mon, 13 Feb 2017 17:47:17 GMT

Hi Saroj and Robert,

Thank you so much for your quick response. There is no special reason not using QueryTask class. Since I need all attributes in a feature layer in JSON format so I thought it might have something other than QueryTask class that gives me direct access to JSON formatted attributes.

esriRequest seems to be the answer for my question, but does it work on a feature service layer? I looked at the example and replaced url to feature service layer, but it didn't return anything. Does esriRequest only work for GeoJson layer?

var url = "https://services.arcgis.com/.../arcgis/rest/services/.../FeatureServer/0"

esriRequest(url, {
responseType: "json"
}).then(function(response){
// The requested data
console.log(response);
var dataJson = response.data;
console.log(dataJson)
});

Thank you,

Makiko

Re: Getting feature layer attributes as object without Query using query class

RobertScheitlin__GISP — Sat, 11 Dec 2021 09:24:29 GMT

Makiko,

You absolutely can use an esriRequest on things other then GeoJSON.

esriRequest({
  url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/NapervilleShelters/FeatureServer/0/query?where=1%3D1&returnGeometry=false&&outfields=*&f=pjson",
  handleAs: "json",
  timeout: 10000
  }
).then(function(response){
  console.info(response);
});‍‍‍‍‍‍‍‍

Re: Getting feature layer attributes as object without Query using query class

Anonymous User — Mon, 13 Feb 2017 19:16:23 GMT

Hi Robert,

I tested your code, but it gave me an error. This is not a big deal so I fixed it and tried it again. But it still doesn't give me any response. Though, the example code that uses GeoJson works fine. I wonder what is the problem with the feature service layer.

Re: Getting feature layer attributes as object without Query using query class

RobertScheitlin__GISP — Sat, 11 Dec 2021 09:24:31 GMT

Makiko,

I am not sure whats going wrong in your code then. Here is a full example of using esriRequest:

<!DOCTYPE html>
<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no" />
  <title>Request Test</title>
  <link rel="stylesheet" type="text/css" href="http://js.arcgis.com/3.18/dijit/themes/claro/claro.css">
  <link rel="stylesheet" type="text/css" href="http://js.arcgis.com/3.18/esri/css/esri.css">
  <style>
    html,
    body,
    #mainWindow {
      height: 100%;
      width: 100%;
      margin: 0;
      padding: 0;
    }
    body {
      background-color: #FFF;
      overflow: hidden;
      font-family: "Trebuchet MS";
    }
    #header {
      height: 3%;
      overflow: auto;
    }
  </style>
  <script>
    var dojoConfig = {
      parseOnLoad: true
    };
  </script>
  <script src="http://js.arcgis.com/3.18/"></script>
  <script>
    var map;
    require([
      "esri/map",
      "dojo/_base/lang",
      "esri/request",
      "dijit/layout/BorderContainer",
      "dijit/layout/ContentPane",
      "dojo/domReady!"
    ], function(
      Map, lang, esriRequest
    ) {
      map = new Map("map", {
        basemap: "topo",
        center: [-120.1883, 37.0868],
        zoom: 6
      });

      esriRequest({
          url:"http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Louisville/LOJIC_LandRecords_Louisville/MapServer/layers",
          content:{
            f:'json'
          },
          handleAs:'json',
          callbackParamName:'callback',
          timeout:15000
        }).then(lang.hitch(this,function(resp){
          console.info(resp);
          if(resp.layers){
            resp.layers.forEach(function(layerInfo){
               //Do something
            });
          }
        }),lang.hitch(this,function(error){
          alert("Data failed");
        }));
    });
  </script>
</head>

<body class="claro">
  <div id="mainWindow" data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline', gutters:false" style="padding:0px;margin:0px;">
    <div id="map" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'left'" style="width:100%;height:100%;border:none;padding:0px;margin:0px;"></div>
  </div>
</body>

</html>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Getting feature layer attributes as object without Query using query class

Anonymous User — Mon, 13 Feb 2017 20:33:51 GMT

Hi Robert,

I am using JavaScript API 4.2.

Re: Getting feature layer attributes as object without Query using query class

RobertScheitlin__GISP — Sat, 11 Dec 2021 09:24:34 GMT

Ah. that make sense now. Here is a 4.2 version of the sample:

<!DOCTYPE html>
<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no" />
  <title>Request Test</title>
  <link rel="stylesheet" href="http://js.arcgis.com/4.2/esri/css/main.css">
  <link rel="stylesheet" type="text/css" href="http://js.arcgis.com/4.2/dijit/themes/claro/claro.css">
  <style>
    html,
    body,
    #viewDiv {
      height: 100%;
      width: 100%;
      margin: 0;
      padding: 0;
    }
    body {
      background-color: #FFF;
      overflow: hidden;
      font-family: "Trebuchet MS";
    }
    #header {
      height: 3%;
      overflow: auto;
    }
  </style>
  <script>
    var dojoConfig = {
      parseOnLoad: true
    };
  </script>
  <script src="http://js.arcgis.com/4.2/"></script>
  <script>
    var map;
    require([
      "esri/Map",
      "esri/views/MapView",
      "dojo/_base/lang",
      "esri/request",
      "dijit/layout/BorderContainer",
      "dijit/layout/ContentPane",
      "dojo/domReady!"
    ], function(
      Map, MapView, lang, esriRequest
    ) {
      map = new Map({
        basemap: "topo"
      });
      
      var view = new MapView({
        container: "viewDiv",
        map: map,
        zoom: 4,
        center: [15, 65]
      });
      var url = "http://sampleserver6.arcgisonline.com/arcgis/rest/services/NapervilleShelters/FeatureServer/0/query?where=1%3D1&returnGeometry=false&&outfields=*&f=pjson";
      esriRequest(url,{
          responseType:'json',
          callbackParamName:'callback',
          timeout:15000
        }).then(lang.hitch(this,function(resp){
          console.info(resp.data);
          alert("Data returned");
        }),lang.hitch(this,function(error){
          alert("Data failed");
        }));
    });
  </script>
</head>

<body class="claro">
  <div id="viewDiv" data-dojo-type="dijit/layout/BorderContainer" data-dojo-props="design:'headline', gutters:false" style="padding:0px;margin:0px;">
    <div id="map" data-dojo-type="dijit/layout/ContentPane" data-dojo-props="region:'left'" style="width:100%;height:100%;border:none;padding:0px;margin:0px;"></div>
  </div>
</body>

</html>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Getting feature layer attributes as object without Query using query class

Anonymous User — Mon, 13 Feb 2017 22:26:52 GMT

Hi Robert,

Wonderful!! It works perfectly. Thank you so much!