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Showing content from https://developers.arcgis.com/en/javascript/jsapi/querytask-amd.html below:

QueryTask | API Reference | ArcGIS API for JavaScript 3.46

require(["esri/tasks/QueryTask"], function(QueryTask) { /* code goes here */ });

(Added at v1.0)

Executes a query operation on a layer resource of a map service exposed by the ArcGIS Server REST API.

Search for

that use this class.

[ On Style Events | Connect Style Event ]

All On Style event listeners receive a single event object. Additionally, the event object also contains a 'target' property whose value is the object which fired the event.

Constructor Details

Creates a new QueryTask object used to execute a query on the layer resource identified by the url.

require([
  "esri/tasks/QueryTask", ... 
], function(QueryTask, ... ) {
  var queryTask = new QueryTask("https://www.example.com/argis/rest/services/Specialty/ESRI_StatesCitiesRivers_USA/MapServer/0");
  ...
});

Property Details

The geodatabase version to display. (As of v2.7). Requires ArcGIS Server service 10.1 or greater (Added at v2.7)

The dynamic layer or table source. The url should end with /dynamicLayer.

URL to the ArcGIS Server REST resource that represents a map service layer. To obtain the URL, use

.

Method Details

Executes a

against an ArcGIS Server map layer. The result is returned as a

. If the query is successful, the user-specified callback function is invoked with the result. A

contains an array of

features, which can be added to the map using

. This array will not be populated if no results are found.

require([
  "esri/tasks/query", "esri/tasks/QueryTask", ... 
], function(Query, QueryTask, ... ) {
  var query = new Query();
  var queryTask = new QueryTask( ... );
  query.where = "STATE_NAME = 'Washington'";
  query.outSpatialReference = {wkid:102100}; 
  query.returnGeometry = true;
  query.outFields = ["CITY_NAME"];
  queryTask.execute(query, addPointsToMap);
  ...
});

Get a count of the number of features that satisfy the input query. Valid only for layers published using ArcGIS Server 10 SP1 or greater. Layers published with earlier versions of ArcGIS Server return an error to the error callback. (Added at v2.1)

require([
  "esri/tasks/query", "esri/tasks/QueryTask", "dojo/dom"... 
], function(Query, QueryTask, dom, ... ) {
  var query = new Query();
  var queryTask = new QueryTask( ... );
  query.where = "POP90_SQMI < 100";
  queryTask.executeForCount(query,function(count){
    dom.byId("info").innerHTML = count + " features matched the input query";
  },function(error){
    console.log(error);
  });
  ...
});

Get the extent of the features that satisfy the input query. The count of features that satisfy the input query is returned as well. Valid only for

on

and for ArcGIS Server 10.3.1 and later.

Executes a

against an ArcGIS Server map layer. The result is an array of object IDs for features that satisfy the input query. There is no limit to the number of object IDs returned in the ID array response.

require([
  "esri/tasks/query", "esri/tasks/QueryTask", ... 
], function(Query, QueryTask, ... ) {
  var query = new Query();
  var queryTask = new QueryTask( ... );
  query.where = "region = 'Southern California'"; 
  queryTask.executeForIds(query,function(results){
    console.log(results);
  });
  ...
});

Executes a

against an ArcGIS Server map layer (or table). The result is returned as a

. If the query is successful, the user-specified callback function is invoked with the result. The result of this operation are featuresets grouped by source layer (or table) object IDs. Each featureset contains an array of

features including the values for the fields requested by the user. This array will not be populated if no results are found.

Event Details

[ On Style Events | Connect Style Event ]

Fires when the query operation is complete. Should be used in favor of onComplete. (Added at v3.5)

Fires when an error occurs when executing the task. (Added at v3.6)

Fires when the query for the count is complete. This event is only available for layers published using ArcGIS Server 10 SP1 or later. Should be used in favor of onExecuteForCountComplete. (Added at v3.5)

Fires when the query on IDs is complete. Should be used in favor of onExecuteForIdsComplete. (Added at v3.5)

Fires when the executeRelationshipQuery is complete. Should be used in favor of onExecuteRelationshipQueryComplete. (Added at v3.5)

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