arcade | API Reference | ArcGIS Maps SDK for JavaScript 4.30

See also

Method Overview

Name	Return Type	Summary	Object
	Promise<ArcadeExecutor>	Compiles an Arcade expression and its profile into an executor.	arcade
	Profile	Creates a Profile definition for an Arcade profile implemented in the ArcGIS Maps SDK for JavaScript.	arcade

Method Details

createArcadeExecutor Method createArcadeExecutor(script, profile){Promise<ArcadeExecutor>}

Compiles an Arcade expression and its profile into an executor. The executor provides functions to evaluate the results for profile variables.

Parameters

script String

The Arcade expression to compile and execute.

profile Profile

The profile definition used to execute the given expression. The profile defines the profile variable names and data types the user may use as inputs in the expression. The variable instances are provided to the executor function.

Returns

Type	Description
Promise<ArcadeExecutor>	Resolves to an ArcadeExecutor that provides a synchronous (if applicable) and asynchronous function used to evaluate the compiled Arcade expression when provided with valid input profile variables.

See also

Sample - Execute Arcade for a custom chart

Examples

// Synchronous execution for all features in layer view
// % of the population not in labor force
const arcadeScript = "(($feature.POP_16UP - $feature.EMP_CY) / $feature.POP_16UP) * 100"

const profile = {
  variables: [{
    name: "$feature",
    type: "feature"
  }]
};

const laborForceExecutor = await createArcadeExecutor(arcadeScript, profile);
// ensures data values from fields used in the expression are
// available when the expression executes.
layer.outFields = laborForceExecutor.fieldsUsed;

const { features } = await layerView.queryFeatures();

const allValues = features.map( (feature) => {
  return laborForceExecutor.execute({
    "$feature": feature
  });
});

// allValues can be displayed in a chart, or used to
// report stats for this variable

// Asynchronous execution for one feature clicked in the view

const profile = {
  variables: [{
    name: "$feature",
    type: "feature"
  }, {
    name: "$layer",
    type: "featureSet"
  }]
};

// This expression executes on each feature click. It compares the % of the population
// not participating in the labor force with the same value of all features within
// one mile of the selected feature's location
const arcadeScript = `
  var featureNotLaborForce = Round((($feature.POP_16UP - $feature.EMP_CY)/$feature.POP_16UP)*100);
  var id = $feature.OBJECTID;

  var neighbors = Filter( Intersects( $layer, BufferGeodetic($feature, 1, "mile") ), "OBJECTID <> @id" );
  if( Count(neighbors) == 0 ){
    return "No neighbors within 1 mile";
  }

  var neighborsNotLaborForceAverage = Average(neighbors, "( (POP_16UP - EMP_CY) / POP_16UP) * 100");
  var difference = Round(featureNotLaborForce - neighborsNotLaborForceAverage);
  var differenceText = IIF(difference > 0, "+"+difference, Text(difference));
  return differenceText;
`;

const neighborhoodExecutor = await createArcadeExecutor(arcadeScript, profile);
// ensures data values from fields used in the expression are
// available when the expression executes.
layer.outFields = neighborhoodExecutor.fieldsUsed;

view.on("click", async (event) => {
  const hitResponse = await view.hitTest(event, include: { layer });
  const hitGraphic = hitResponse?.results[0].graphic;

  const scriptResult = await neighborhoodExecutor.executeAsync({
    "$feature": hitGraphic,
    "$layer": hitGraphic.layer
  }, {
    spatialReference: view.spatialReference
  });

  // display the value of scriptResult in a UI component or use it
  // in some form of client-side analysis
});

createArcadeProfile Method createArcadeProfile(profileName){Profile} Since: ArcGIS Maps SDK for JavaScript 4.25 arcade since 4.24, createArcadeProfile added at 4.25.

Creates a Profile definition for an Arcade profile implemented in the ArcGIS Maps SDK for JavaScript. The result of this should be provided to the createArcadeExecutor method.

Parameter

profileName String

The name of the Arcade profile definition to create.

Returns

Type	Description
Profile	Returns the profile definition used to execute an expression with the ArcadeExecutor.

See also

Example

const labelingProfile = arcade.createArcadeProfile("labeling");
// creates the following object to be provided to the createArcadeExecutor method.
// {
//   variables: [{
//     name: "$feature",
//     type: "feature"
//   }]
// }

const labelExecutor = await createArcadeExecutor("$feature.NAME + ' COUNTY'", labelingProfile);

Type Definitions

ArcadeExecutor Type Definition ArcadeExecutor

An executor provides a synchronous (if applicable) and asynchronous function used to evaluate the compiled Arcade expression with the inputs of the declared profile variables. It also provides metadata about the compilation result.

Properties

execute ExecuteFunction

A function that can be invoked to evaluate the compiled expression for a set of profile variables. Will return the results of the evaluation. This function will only be available if isAsync is false.

executeAsync ExecuteFunctionAsync

Asynchronous function that evaluates the compiled expression. This function may always be used to evaluate the expression, but must be used if isAsync is true.

fieldsUsed String []

References the names of fields used in the compiled expression when working with the $feature profile variable or functions that expect field names, such as Expects. Field names referenced here should be requested by the underlying layer or datastore. In JavaScript, this is typically done with layer.outFields.

geometryUsed Boolean

Indicates whether the expression accesses or uses a feature's geometry.

isAsync Boolean

Indicates whether the compiled expression accesses data using a FeatureSet function and therefore must be executed using the executeAsync function. If false, the expression may be executed with execute or executeAsync.

See also

createArcadeExecutor

Examples

// Synchronous execution for all features in layer view
// % of the population not in labor force
const arcadeScript = "(($feature.POP_16UP - $feature.EMP_CY) / $feature.POP_16UP) * 100"

const profile = {
  variables: [{
    name: "$feature",
    type: "feature"
  }]
};

const laborForceExecutor = await createArcadeExecutor(arcadeScript, profile);
// ensures data values from fields used in the expression are
// available when the expression executes.
layer.outFields = laborForceExecutor.fieldsUsed;

const { features } = await layerView.queryFeatures();

const allValues = features.map( (feature) => {
  return laborForceExecutor.execute({
    "$feature": feature
  });
});

// allValues can be displayed in a chart, or used to
// report stats for this variable

// Asynchronous execution for one feature clicked in the view

const profile = {
  variables: [{
    name: "$feature",
    type: "feature"
  }, {
    name: "$layer",
    type: "featureSet"
  }]
};

// This expression executes on each feature click. It compares the % of the population
// not participating in the labor force with the same value of all features within
// one mile of the selected feature's location
const arcadeScript = `
  var featureNotLaborForce = Round((($feature.POP_16UP - $feature.EMP_CY)/$feature.POP_16UP)*100);
  var id = $feature.OBJECTID;

  var neighbors = Filter( Intersects( $layer, BufferGeodetic($feature, 1, "mile") ), "OBJECTID <> @id" );
  if( Count(neighbors) == 0 ){
    return "No neighbors within 1 mile";
  }

  var neighborsNotLaborForceAverage = Average(neighbors, "( (POP_16UP - EMP_CY) / POP_16UP) * 100");
  var difference = Round(featureNotLaborForce - neighborsNotLaborForceAverage);
  var differenceText = IIF(difference > 0, "+"+difference, Text(difference));
  return differenceText;
`;

const neighborhoodExecutor = await createArcadeExecutor(arcadeScript, profile);
// ensures data values from fields used in the expression are
// available when the expression executes.
layer.outFields = neighborhoodExecutor.fieldsUsed;

view.on("click", async (event) => {
  const hitResponse = await view.hitTest(event, include: { layer });
  const hitGraphic = hitResponse?.results[0].graphic;

  const scriptResult = await neighborhoodExecutor.executeAsync({
    "$feature": hitGraphic,
    "$layer": hitGraphic.layer
  }, {
    spatialReference: view.spatialReference
  });

  // display the value of scriptResult in a UI component or use it
  // in some form of client-side analysis
});

const profile = {
  variables: [{
    name: "$feature",
    type: "feature"
  }]
};

// Arcade expression defined by user...
const syncExecutor = await createArcadeExecutor(arcadeScript, profile);
// ensures data values from fields used in the expression are
// available when the expression executes.
layer.outFields = syncExecutor.fieldsUsed;

// throw error if expression from user uses
// invalid functions that require async execution
if(syncExecutor.isAsync){
  throw new Error("Invalid expression. Expression should not use FeatureSet functions.");
}

const { features } = await layerView.queryFeatures();

const allValues = features.map( (feature) => {
  return syncExecutor.execute({
    "$feature": feature
  });
});

// allValues can be displayed in a chart, or used to
// report stats for this variable

ArrayElementType Type Definition ArrayElementType

The type definition of a profile variable of type array.

Properties: type String|String

The Arcade data type of the variable. See ProfileVariableInstanceType to see the mapping of Arcade types to JavaScript types.

Possible Values:"dictionary"|"feature"|"featureSet"|"featureSetCollection"|"geometry"|"number"|"text"|"date"|"dateOnly"|"time"|"boolean"|"knowledgeGraph"

properties ProfileVariable []

optional
Only applicable when type is dictionary. The type definitions of the dictionary's properties. The names of these properties should not begin with the $ character.

elementType ArrayElementType

optional
Only applicable when type is array. The type definition of the Array's items. Arcade arrays must be of a single type when used as an input profile variable. When indicating an elementType, you do not need to specify a name for the element.

ArrayVariable Type Definition ArrayVariable

The type definition for an Arcade array profile variable.

Properties: name String

The name of the profile variable. To follow Arcade's naming convention, this should start with the $ character unless this variable is nested in a DictionaryVariable.

type String

The Arcade data type of the variable. For ArrayVariable, the type is always array. The corresponding JavaScript type to an Arcade Array is an array following the specification defined in ProfileVariableInstanceType.

elementType ArrayElementType

optional
The type definition of the Array's items. Arcade arrays must be of a single type when used as an input profile variable. When indicating an elementType, you do not need to specify a name for the element.

Example

const profile = {
  variables: [{
    name: "$checkpoints",
    type: "array",
    elementType: {
      type: "feature"
    }
  }]
};

DictionaryVariable Type Definition DictionaryVariable

The type definition for an Arcade dictionary profile variable.

Properties: name String

The name of the profile variable. To follow Arcade's naming convention, this should start with the $ character unless this variable is nested in another DictionaryVariable. See the example below.

type String

The Arcade data type of the variable. The corresponding JavaScript type to an Arcade Dictionary is a plain Object following the specification defined in ProfileVariableInstanceType.

The value is always "dictionary".

properties ProfileVariable []

optional
The type definitions of the dictionary's properties. The names of these properties should not begin with the $ character.

Example

const profile = {
  variables: [{
    name: "$analysisParams",
    type: "dictionary",
    properties: [{
      name: "distance",
      type: "number"
    }, {
      name: "projectType",
      type: "text"
    }, {
      name: "includeBuffer",
      type: "boolean"
    }]
  }, {
     name: "$projectLocation",
     type: "feature"
  }]
};

ExecuteContext Type Definition ExecuteContext

The execution context of the Arcade expression.

Properties: spatialReference SpatialReference

optional
The expected spatial reference of input geometries in geometry functions. If executing an expression in the context of a map, then set the spatial reference of the view to this property. If executing an expression in the context of a layer, then use the layer's spatial reference. If not specified, then the spatial reference defaults to WebMercator.

timeZone String

optional
Default Value:system

Since 4.28 Defines the default time zone in which to create and display Arcade date types. Possible values include any time zone that may be set on the View.timeZone. Generally, if the Arcade context's profile involves a map, or features originating from a map, the value of View.timeZone should be set here. By default, the time zone is set to "system".

Examples

// the input feature's geometry is expected
// to be in the spatial reference of the view
// All Arcade dates will be represented in the
// time zone of the view or web map.
await executor.executeAsync({
  "$feature": feature
}, {
  spatialReference: view.spatialReference,
  timeZone: view.timeZone
});

// the input feature's geometry is expected
// to be in the spatial reference of the layer
await executor.executeAsync({
  "$feature": feature
}, {
  spatialReference: layer.spatialReference
});

// the input feature's geometry is expected
// to be Web Mercator
await executor.executeAsync({
  "$feature": feature
});

ExecuteFunction Type Definition ExecuteFunction(profileVariableInstances, context){ResultType}

Executes the compiled Arcade expression synchronously with the given profile variable instances. This function may not be used if the expression accesses data using FeatureSet functions.

Parameters

profileVariableInstances Object

An object of key/value pairs where the key is the name of a ProfileVariable defined when creating the executor. The key's value must be of type ProfileVariableInstanceType.

context ExecuteContext

optional

The context with which to execute the expression.

Returns

Type	Description
ResultType	Returns the value of the evaluated expression.

Examples

// Synchronous execution for all features in layer view
// % of the population not in labor force
const arcadeScript = "(($feature.POP_16UP - $feature.EMP_CY) / $feature.POP_16UP) * 100"

const profile = {
  variables: [{
    name: "$feature",
    type: "feature"
  }]
};

const laborForceExecutor = await createArcadeExecutor(arcadeScript, profile);
// ensures data values from fields used in the expression are
// available when the expression executes.
layer.outFields = laborForceExecutor.fieldsUsed;

const { features } = await layerView.queryFeatures();

const allValues = features.map( (feature) => {
  return laborForceExecutor.execute({
    "$feature": feature
  });
});

// allValues can be displayed in a chart, or used to
// report stats for this variable

const profile = {
  variables: [{
    name: "$feature",
    type: "feature"
  }]
};

// Arcade expression defined by user...
const syncExecutor = await createArcadeExecutor(arcadeScript, profile);
// ensures data values from fields used in the expression are
// available when the expression executes.
layer.outFields = syncExecutor.fieldsUsed;

// throw error if expression from user uses invalid functions
if(syncExecutor.isAsync){
  throw new Error("Invalid expression. Expression should not use FeatureSet functions.");
}

const { features } = await layerView.queryFeatures();

const allValues = features.map( (feature) => {
  return syncExecutor.execute({
    "$feature": feature
  });
});

// allValues can be displayed in a chart, or used to
// report stats for this variable

ExecuteFunctionAsync Type Definition ExecuteFunctionAsync(profileVariableInstances, context){Promise<ResultType>}

Executes the compiled Arcade expression asynchronously with the given profile variable instances.

Parameters

profileVariableInstances Object

An object of key/value pairs where the key is the name of a ProfileVariable defined when creating the executor, whose value must be of type ProfileVariableInstanceType.

context ExecuteContext

optional

The context with which to execute the expression.

Returns

Type	Description
Promise<ResultType>	Resolves to the value of the evaluated expression.

Example

// Asynchronous execution for one feature clicked in the view

const profile = {
  variables: [{
    name: "$feature",
    type: "feature"
  }, {
    name: "$layer",
    type: "featureSet"
  }]
};

// This expression executes on each feature click. It compares the % of the population
// not participating in the labor force with the same value of all features within
// one mile of the selected feature's location
const arcadeScript = `
  var featureNotLaborForce = Round((($feature.POP_16UP - $feature.EMP_CY)/$feature.POP_16UP)*100);
  var id = $feature.OBJECTID;

  var neighbors = Filter( Intersects( $layer, BufferGeodetic($feature, 1, "mile") ), "OBJECTID <> @id" );
  if( Count(neighbors) == 0 ){
    return "No neighbors within 1 mile";
  }

  var neighborsNotLaborForceAverage = Average(neighbors, "( (POP_16UP - EMP_CY) / POP_16UP) * 100");
  var difference = Round(featureNotLaborForce - neighborsNotLaborForceAverage);
  var differenceText = IIF(difference > 0, "+"+difference, Text(difference));
  return differenceText;
`;

const neighborhoodExecutor = await createArcadeExecutor(arcadeScript, profile);
// ensures data values from fields used in the expression are
// available when the expression executes.
layer.outFields = neighborhoodExecutor.fieldsUsed;

view.on("click", async (event) => {
  const hitResponse = await view.hitTest(event, include: { layer });
  const hitGraphic = hitResponse?.results[0].graphic;

  const scriptResult = await neighborhoodExecutor.executeAsync({
    "$feature": hitGraphic,
    "$layer": hitGraphic.layer
  }, {
    spatialReference: view.spatialReference
  });

  // display the value of scriptResult in a UI component or use it
  // in some form of client-side analysis
});

Layer types that may be used to back FeatureSets in Arcade expressions.

Profile Type Definition Profile

Defines the definitions of a profile's input variables. This consists of an array of objects specifying the name of each profile variable and its Arcade data type. All profile names must begin with the $ character.

Property: variables ProfileVariable []

The Arcade type definitions for profile variables used as input to the compiled expression.

Example

const profile = {
  variables: [{
    name: "$mapClick",
    type: "geometry"
  }, {
    name: "$threshold",
    type: "number"
  }, {
    name: "$feature",
    type: "feature"
  }, {
    name: "$map",
    type: "featureSetCollection"
  }]
};

ProfileVariable Type Definition ProfileVariable SimpleVariable |DictionaryVariable |ArrayVariable

The type definition of a profile variable. See the individual profile variable types for more information and examples.

The JavaScript types that may be used as inputs to profile variables when evaluating compiled expressions with ExecuteFunction or ExecuteFunctionAsync. See the table below for the following mapping of JavaScript types that may be used to hydrate profile variables for corresponding Arcade data types.

Arcade type	JS type	Notes
Number	Number
Text	String
Date	Date	Dates returned from Arcade expressions will not preserve time zone information included in the Arcade Date value. Since native JS Dates objects do not include time zone information, they will always display in the local or system time of the client executing the expression. To preserve time zone information in dates returned from Arcade, the expression author should cast dates to Arcade Text values in the return statement of the expression.
DateOnly	String
Time	String
Boolean	Boolean
Dictionary	Object	An object with key/value pairs with keys defined by a DictionaryVariable whose values must be one of ProfileVariableInstanceType.
KnowledgeGraph	KnowledgeGraph	This value typically comes from KnowledgeGraphLayer.knowledgeGraph.
Array	Array	Arcade arrays are immutable and must be of a single ProfileVariableInstanceType.
Geometry	Geometry
Feature	Graphic
FeatureSet	FeatureSetLayer \| FeatureSet
FeatureSetCollection	Map \| String	A string may be provided, pointing to the url of a Feature Service.

The JavaScript type of the result returned from the Arcade expression.

SimpleVariable Type Definition SimpleVariable

The type definition for a simple Arcade profile variable.

Properties: name String

The name of the profile variable. To follow Arcade's naming convention, this should start with the $ character unless this variable is nested in a DictionaryVariable.

type String

The Arcade data type of the variable. See ProfileVariableInstanceType to see the mapping of Arcade types to JavaScript types.

Possible Values:"feature"|"featureSet"|"featureSetCollection"|"geometry"|"number"|"text"|"date"|"dateOnly"|"time"|"boolean"|"knowledgeGraph"

Example

const profile = {
  variables: [{
    name: "$mapClick",
    type: "geometry"
  }, {
    name: "$threshold",
    type: "number"
  }, {
    name: "$feature",
    type: "feature"
  }, {
    name: "$map",
    type: "featureSetCollection"
  }]
};