Editable ArcGIS REST Feature Service

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index.html<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Editable ArcGIS REST Feature Service</title>
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
    <style>
      .map {
        width: 100%;
        height:400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <form class="form-inline">
      <label>Draw or modify &nbsp;</label>
      <select id="type">
        <option value="DRAW">Draw</option>
        <option value="MODIFY">Modify</option>
      </select>
    </form>
    <script src="index.js"></script>
  </body>
</html>

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index.jsimport 'ol/ol.css';
import Map from 'ol/Map';
import View from 'ol/View';
import EsriJSON from 'ol/format/EsriJSON';
import {defaults as defaultInteractions, Draw, Modify, Select} from 'ol/interaction';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer';
import {tile as tileStrategy} from 'ol/loadingstrategy';
import {fromLonLat} from 'ol/proj';
import VectorSource from 'ol/source/Vector';
import XYZ from 'ol/source/XYZ';
import {createXYZ} from 'ol/tilegrid';


var serviceUrl = 'https://services.arcgis.com/rOo16HdIMeOBI4Mb/arcgis/rest/' +
    'services/PDX_Pedestrian_Districts/FeatureServer/';
var layer = '0';

var esrijsonFormat = new EsriJSON();

var vectorSource = new VectorSource({
  loader: function(extent, resolution, projection) {
    var url = serviceUrl + layer + '/query/?f=json&' +
        'returnGeometry=true&spatialRel=esriSpatialRelIntersects&geometry=' +
        encodeURIComponent('{"xmin":' + extent[0] + ',"ymin":' +
            extent[1] + ',"xmax":' + extent[2] + ',"ymax":' + extent[3] +
            ',"spatialReference":{"wkid":102100}}') +
        '&geometryType=esriGeometryEnvelope&inSR=102100&outFields=*' +
        '&outSR=102100';
    $.ajax({url: url, dataType: 'jsonp', success: function(response) {
      if (response.error) {
        alert(response.error.message + '\n' +
            response.error.details.join('\n'));
      } else {
        // dataProjection will be read from document
        var features = esrijsonFormat.readFeatures(response, {
          featureProjection: projection
        });
        if (features.length > 0) {
          vectorSource.addFeatures(features);
        }
      }
    }});
  },
  strategy: tileStrategy(createXYZ({
    tileSize: 512
  }))
});

var vector = new VectorLayer({
  source: vectorSource
});

var raster = new TileLayer({
  source: new XYZ({
    attributions: 'Tiles © <a href="https://services.arcgisonline.com/ArcGIS/' +
        'rest/services/World_Topo_Map/MapServer">ArcGIS</a>',
    url: 'https://server.arcgisonline.com/ArcGIS/rest/services/' +
        'World_Topo_Map/MapServer/tile/{z}/{y}/{x}'
  })
});

var draw = new Draw({
  source: vectorSource,
  type: 'Polygon'
});

var select = new Select();
select.setActive(false);
var selected = select.getFeatures();

var modify = new Modify({
  features: selected
});
modify.setActive(false);

var map = new Map({
  interactions: defaultInteractions().extend([draw, select, modify]),
  layers: [raster, vector],
  target: document.getElementById('map'),
  view: new View({
    center: fromLonLat([-122.619, 45.512]),
    zoom: 12
  })
});

var typeSelect = document.getElementById('type');


/**
 * Let user change the interaction type.
 */
typeSelect.onchange = function() {
  draw.setActive(typeSelect.value === 'DRAW');
  select.setActive(typeSelect.value === 'MODIFY');
  modify.setActive(typeSelect.value === 'MODIFY');
};

var dirty = {};

selected.on('add', function(evt) {
  var feature = evt.element;
  feature.on('change', function(evt) {
    dirty[evt.target.getId()] = true;
  });
});

selected.on('remove', function(evt) {
  var feature = evt.element;
  var fid = feature.getId();
  if (dirty[fid] === true) {
    var payload = '[' + esrijsonFormat.writeFeature(feature, {
      featureProjection: map.getView().getProjection()
    }) + ']';
    var url = serviceUrl + layer + '/updateFeatures';
    $.post(url, {f: 'json', features: payload}).done(function(data) {
      var result = JSON.parse(data);
      if (result.updateResults && result.updateResults.length > 0) {
        if (result.updateResults[0].success !== true) {
          var error = result.updateResults[0].error;
          alert(error.description + ' (' + error.code + ')');
        } else {
          delete dirty[fid];
        }
      }
    });
  }
});

draw.on('drawend', function(evt) {
  var feature = evt.feature;
  var payload = '[' + esrijsonFormat.writeFeature(feature, {
    featureProjection: map.getView().getProjection()
  }) + ']';
  var url = serviceUrl + layer + '/addFeatures';
  $.post(url, {f: 'json', features: payload}).done(function(data) {
    var result = JSON.parse(data);
    if (result.addResults && result.addResults.length > 0) {
      if (result.addResults[0].success === true) {
        feature.setId(result.addResults[0]['objectId']);
        vectorSource.clear();
      } else {
        var error = result.addResults[0].error;
        alert(error.description + ' (' + error.code + ')');
      }
    }
  });
});