KnowledgeGraph

AMD: require(["esri/rest/knowledgeGraph/KnowledgeGraph"], (KnowledgeGraph) => { /* code goes here */ });
ESM: import KnowledgeGraph from "@arcgis/core/rest/knowledgeGraph/KnowledgeGraph.js";
Class: esri/rest/knowledgeGraph/KnowledgeGraph
Inheritance: KnowledgeGraphAccessor
Since: ArcGIS Maps SDK for JavaScript 4.25
beta

The knowledge graph associated with the knowledgeGraphService. This is a graph database that stores entities and relationships.

See also
Examples
//fetch the knowledge graph
require([
  "esri/rest/knowledgeGraphService"
], (KnowledgeGraphModule)  => {
  const url = "https://<web server hostname>/server/rest/admin/services/<serviceName>/KnowledgeGraphServer";
  KnowledgeGraphModule.fetchKnowledgeGraph(url)
   .then((kg) => {
      //do something with result
     console.log(kg)
  });
});
//sample result returned from fetchKnowledgeGraph()
{
 "url":"https://myHostName.domain.com/arcgis/rest/services/Hosted/myServiceName/KnowledgeGraphServer"
 {
 "dataModel": {
   "declaredClass": "esri.rest.knowledgeGraph.DataModel",
   "timestamp": {},
   "spatialReference": {
     "latestWkid": 0,
     "wkid": 4326,
     "vcsWkid": 0,
     "latestVcsWkid": 0
   },
   "strict": false,
   "entityTypes": [
     {
       "declaredClass": "esri.rest.knowledgeGraph.EntityType",
       "name": "company",
       "alias": "Company",
       "role": "Regular",
       "strict": false,
       "properties": [
         {
           "declaredClass": "esri.rest.knowledgeGraph.GraphProperty",
           "name": "Name",
           "alias": "Name",
           "fieldType": "esriFieldTypeString",
           "geometryType": "esriGeometryNull",
           "hasM": false,
           "hasZ": false,
           "nullable": true,
           "editable": true,
           "required": false,
           "defaultVisibility": true,
           "systemMaintained": false,
           "role": "esriGraphPropertyRegular",
           "defaultValue": null
         },
         {
           "declaredClass": "esri.rest.knowledgeGraph.GraphProperty",
           "name": "id",
           "alias": "ID",
           "fieldType": "esriFieldTypeOID",
           "geometryType": "esriGeometryNull",
           "hasM": false,
           "hasZ": false,
           "nullable": false,
           "editable": false,
           "required": true,
           "defaultVisibility": true,
           "systemMaintained": true,
           "role": "esriGraphPropertyRegular",
           "defaultValue": null
         }
       ],
       "fieldIndexes": [
         {
           "declaredClass": "esri.rest.knowledgeGraph.FieldIndex",
           "name": "esri__id_idx",
           "unique": true,
           "ascending": true,
           "description": "",
           "fieldNames": [
             "id"
           ]
         },
         {
           "declaredClass": "esri.rest.knowledgeGraph.FieldIndex",
           "name": "esri__name_idx",
           "unique": true,
           "ascending": true,
           "description": "",
           "fieldNames": [
             "name"
           ]
         }
       ]
     }
   ],
   "relationshipTypes": [
     {
       "declaredClass": "esri.rest.knowledgeGraph.RelationshipType",
       "name": "employed_bu",
       "alias": "Employed By",
       "role": "Regular",
       "strict": false,
       "properties": [
         {
           "declaredClass": "esri.rest.knowledgeGraph.GraphProperty",
           "name": "id",
           "alias": "id",
           "fieldType": "esriFieldTypeGUID",
           "geometryType": "esriGeometryNull",
           "hasM": false,
           "hasZ": false,
           "nullable": false,
           "editable": false,
           "required": true,
           "defaultVisibility": true,
           "systemMaintained": true,
           "role": "esriGraphPropertyRegular",
           "defaultValue": null
         },
         {
           "declaredClass": "esri.rest.knowledgeGraph.GraphProperty",
           "name": "start_date",
           "alias": "Start Date",
           "fieldType": "esriFieldTypeGUID",
           "geometryType": "esriGeometryNull",
           "hasM": false,
           "hasZ": false,
           "nullable": false,
           "editable": false,
           "required": true,
           "defaultVisibility": true,
           "systemMaintained": false,
           "role": "esriGraphPropertyRegular",
           "defaultValue": null
         }
       ],
       "fieldIndexes": [
            {
            "ascending": true,
            "description": "index on id field",
            "fieldNames": ["id"],
            "name": "esri_id_idx",
            "unique": "true",
          }
       ],
       "originEntityTypes": [
         "Person"
       ],
       "destinationEntityTypes": [
         "Company"
       ]
     }
   ]
  }
 }
}

Constructors

KnowledgeGraph

Constructor
new KnowledgeGraph(properties)
Parameter
properties Object
optional

See the properties for a list of all the properties that may be passed into the constructor.

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.
Show inherited properties Hide inherited properties
Name Type Summary Class

The data model of the knowledge graph service.

KnowledgeGraph

The name of the class.

Accessor

The service definition of the knowledge graph service.

KnowledgeGraph

The url to a hosted knowledge graph.

KnowledgeGraph

Property Details

dataModel

Property
dataModel DataModelreadonly

The data model of the knowledge graph service. The data model defines the types of entities and relationships that can exist in the knowledge graph and the properties that can exist for each type of entity and relationship.

declaredClass

Inherited
Property
declaredClass Stringreadonly
Inherited from Accessor

The name of the class. The declared class name is formatted as esri.folder.className.

serviceDefinition

Property
serviceDefinition ServiceDefinitionreadonly

The service definition of the knowledge graph service. The service definition outlines the capabilities of the knowledge graph such as search indexes, operations allowed etc.

url

Property
url String |undefined

The url to a hosted knowledge graph. See ArcGIS Hosted Knowledge Graph for more information on knowledge graph services.

Method Overview

Show inherited methods Hide inherited methods
Name Return Type Summary Class

Adds one or more handles which are to be tied to the lifecycle of the object.

Accessor
*

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product.

KnowledgeGraph

Returns true if a named group of handles exist.

Accessor

Removes a group of handles owned by the object.

Accessor

Converts an instance of this class to its ArcGIS portal JSON representation.

KnowledgeGraph

Method Details

addHandles

Inherited
Method
addHandles(handleOrHandles, groupKey)
Inherited from Accessor

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

this.addHandles(handle);

// Destroy the object
this.destroy();
Parameters
handleOrHandles WatchHandle|WatchHandle[]

Handles marked for removal once the object is destroyed.

groupKey *
optional

Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

fromJSON

Method
fromJSON(json){*}static

Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product. The object passed into the input json parameter often comes from a response to a query operation in the REST API or a toJSON() method from another ArcGIS product. See the Using fromJSON() topic in the Guide for details and examples of when and how to use this function.

Parameter
json Object

A JSON representation of the instance in the ArcGIS format. See the ArcGIS REST API documentation for examples of the structure of various input JSON objects.

Returns
Type Description
* Returns a new instance of this class.

hasHandles

Inherited
Method
hasHandles(groupKey){Boolean}
Inherited from Accessor

Returns true if a named group of handles exist.

Parameter
groupKey *
optional

A group key.

Returns
Type Description
Boolean Returns true if a named group of handles exist.
Example
// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}

removeHandles

Inherited
Method
removeHandles(groupKey)
Inherited from Accessor

Removes a group of handles owned by the object.

Parameter
groupKey *
optional

A group key or an array or collection of group keys to remove.

Example
obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");

toJSON

Method
toJSON(){Object}

Converts an instance of this class to its ArcGIS portal JSON representation. See the Using fromJSON() guide topic for more information.

Returns
Type Description
Object The ArcGIS portal JSON representation of an instance of this class.

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