require(["esri/popup/ElementExpressionInfo"], (ElementExpressionInfo) => { /* code goes here */ });
import ElementExpressionInfo from "@arcgis/core/popup/ElementExpressionInfo.js";
esri/popup/ElementExpressionInfo
Defines an Arcade expression used to create an ExpressionContent element in a PopupTemplate. The expression must evaluate to a dictionary, representing a TextContent, FieldsContent, or MediaContent popup element as defined in the Popup Element web map specification.
This expression may access data values from the feature, its layer, or other layers
in the map or datastore with the $feature
, $layer
, $map
, and $datastore
profile variables.
See the Popup Element Arcade Profile specification
for more information and examples of valid return dictionaries.
- See also
// Creates an ordered list in a cluster's popup
// listing the type of fuel used to generate power in the cluster
// ordered by the total number of power plants for each fuel type.
layer.featureReduction = {
type: "cluster",
popupTemplate: {
title: "Power plant summary",
content: [{
type: "expression",
expressionInfo: {
expression: `
// Specify which fields are required by the expression
Expects($aggregatedFeatures, "fuel1", "capacity_mw")
// Query stats for each fuel type
var statsFS = GroupBy($aggregatedFeatures,
[
{ name: 'Type', expression: 'fuel1'},
],
[ // statistics to return for each unique category
{ name: 'capacity_total', expression: 'capacity_mw', statistic: 'SUM' },
{ name: 'capacity_max', expression: 'capacity_mw', statistic: 'MAX' },
{ name: 'num_features', expression: '1', statistic: 'COUNT' }
]
);
// create an list in descending order based
// on the number of plants for each fuel type.
var ordered = OrderBy(statsFs, 'num_features DESC');
var list = "<ol>";
for (var group in ordered){
list += \`<li>\${group.Type} (\${Text(group.num_features, "#,###")})</li>\`
}
list += "</ol>";
// The return dictionary must return a text, fields, or media
// popup element as defined in the web map specification
return {
type: "text",
text: list
}
`,
title: "List of fuel types"
}
}]
}
};
Constructors
-
Parameterproperties Objectoptional
See the properties for a list of all the properties that may be passed into the constructor.
Property Overview
Name | Type | Summary | Class |
---|---|---|---|
The name of the class. | Accessor | ||
The Arcade expression evaluating to a dictionary. | ElementExpressionInfo | ||
The return type of the expression. | ElementExpressionInfo | ||
The title used to describe the popup element returned by the expression. | ElementExpressionInfo |
Property Details
-
expression
expression String
-
The Arcade expression evaluating to a dictionary. The dictionary must represent either a TextContent, FieldsContent, or a MediaContent popup content element as defined in the Popup Element web map specification.
This expression may access data values from the feature, its layer, or other layers in the map or datastore with the
$feature
,$layer
,$map
, and$datastore
profile variables. See the Popup Element Arcade Profile specification for more information and examples of valid return dictionaries.Example// Creates an column chart where each category/value // is an aggregate of two or more fields layer.popupTemplate = { title: "Educational Attainment", content: [{ type: "expression", expressionInfo: { expression: ` // Create a dictionary of attributes representing the values // to display in the table var attributes = { "No School": $feature.no_school + $feature.some_primary, "Primary": $feature.primary_complete + $feature.some_secondary, "Secondary": $feature.secondary_complete + $feature.some_highSchool, "High School": $feature.highSchool_diploma + $feature.highSchool_ged + $feature.some_college, "College/University": $feature.associates + $feature.bachelors + $feature.masters + $feature.doctorate + $feature.professional; }; var fieldInfos = []; // Create an array representing the attribute names (or keys) // to include in the chart for (var k in attributes){ Push(fieldInfos, { fieldName: k }); } // Returns a dictionary providing the information // required by the popup to render a table of key value pairs return { type: "media", attributes: attributes, // The list of attribute names (keys) to include in the table fieldInfos: fieldInfos }; `, title: "Educational Attainment" } }] };
-
returnType
returnType String
-
The return type of the expression. Content element expressions always return dictionaries.
For ElementExpressionInfo the returnType is always "dictionary".
-
title
title String
-
The title used to describe the popup element returned by the expression.
Method Overview
Name | Return Type | Summary | Class |
---|---|---|---|
Adds one or more handles which are to be tied to the lifecycle of the object. | Accessor | ||
Creates a deep clone of the ElementExpressionInfo instance. | ElementExpressionInfo | ||
* | Creates a new instance of this class and initializes it with values from a JSON object generated from an ArcGIS product. | ElementExpressionInfo | |
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. | ElementExpressionInfo |
Method Details
-
Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 4.25Accessor since 4.0, addHandles added at 4.25. -
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();
ParametershandleOrHandles WatchHandle|WatchHandle[]Handles marked for removal once the object is destroyed.
groupKey *optionalKey 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.
-
clone
clone(){ElementExpressionInfo}
-
Creates a deep clone of the ElementExpressionInfo instance.
ReturnsType Description ElementExpressionInfo A deep clone of the ElementExpressionInfo instance.
-
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.Parameterjson ObjectA 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.
ReturnsType Description * Returns a new instance of this class.
-
hasHandles
InheritedMethodhasHandles(groupKey){Boolean}
Inherited from AccessorSince: ArcGIS Maps SDK for JavaScript 4.25Accessor since 4.0, hasHandles added at 4.25. -
Returns true if a named group of handles exist.
ParametergroupKey *optionalA group key.
ReturnsType 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"); }
-
Inherited from Accessor
Since: ArcGIS Maps SDK for JavaScript 4.25Accessor since 4.0, removeHandles added at 4.25. -
Removes a group of handles owned by the object.
ParametergroupKey *optionalA group key or an array or collection of group keys to remove.
Exampleobj.removeHandles(); // removes handles from default group obj.removeHandles("handle-group"); obj.removeHandles("other-handle-group");
-
toJSON
toJSON(){Object}
-
Converts an instance of this class to its ArcGIS portal JSON representation. See the Using fromJSON() guide topic for more information.
ReturnsType Description Object The ArcGIS portal JSON representation of an instance of this class.