ArcadeLabelExpression QML Type
An expression script using the Arcade language. More...
| Import Statement: | import Esri.ArcGISRuntime |
| Since: | Esri.ArcGISRuntime 100.11 |
| Inherits: |
- List of all members, including inherited members
- ArcadeLabelExpression is part of QML Type List.
Properties
- arcadeExpression : ArcadeExpression
Signals
Detailed Description
The label Arcade expression expects to hold a valid, Arcade script and to be read and evaluated by an Arcade expression interpreter. An example expression that combines text with a field value is
"State: " + $feature.State_Name
Note that quotes are needed around the literal text. See https://links.esri.com/arcade for full documentation on the Arcade scripting language and its function library.
Any Arcade functions allowed for the Labeling profile can be used in a label Arcade expression. Other functions (for example, FeatureSet functions) are potentially too slow to be used in a dynamic label evaluation.
Note: If the expression attempts to use attributes that don't exist, then no label will be produced. This is distinct from the attribute existing but having a null or empty value, which can form part of the produced text label.
This QML type supports the following default properties. A default property may be declared inside another declared object without being assigned explicitly to a property.
| Type | Default Property |
|---|---|
| ArcadeExpression | arcadeExpression |
Property Documentation
[default] arcadeExpression : ArcadeExpression |
An ArcadeExpression containing the Arcade expression script to use.
The expression is expected to be a complete, self-contained Arcade script that calculates a text string.
The ArcadeExpression::expression property of arcadeExpression is the same script string as LabelExpression::expression. Changing one will change the other.
Signal Documentation
arcadeExpressionChanged() |
Emitted when the arcadeExpression property changes.
Note: The corresponding handler is onArcadeExpressionChanged.