TransparencyInfo Visual Variable

The transparencyInfo visual variable defines the transparency, or opacity, of each feature's symbol based on a numeric attribute field value.

Referenced by: visualVariable


Property Details
field Attribute field used for setting the transparency of a feature if no valueExpression is provided.
legendOptions Options available for the legend.
normalizationField Attribute field used to normalize the data.
stops[] An array of transparencyStop objects.
type Specifies the type of visual variable.
Valid value of this property transparencyInfo
valueExpression An Arcade expression evaluating to a number.
valueExpressionTitle The title identifying and describing the associated Arcade expression as defined in the valueExpression property.


Live sample web maps showing use of the transparencyInfo visual variable.

  "type": "transparencyInfo",
  "valueExpression": "var fieldNames = [ \"GRADDEG_CY\", \"BACHDEG_CY\", \"SMCOLL_CY\", \"HSGRAD_CY\" ];\nvar numFields = 4;\nvar maxValueField = null;\nvar maxValue = -Infinity;\nvar value, i, totalValue = null;\nfor(i = 0; i < numFields; i++) {\nvalue = $feature[fieldNames[i]];\nif(value > 0) {\nif(value > maxValue) {\nmaxValue = value;\nmaxValueField = fieldNames[i];\n}\nelse if (value == maxValue) {\nmaxValueField = null;\n}\n}\nif(value != null && value >= 0) {\nif (totalValue == null) { totalValue = 0; }\ntotalValue = totalValue + value;\n}\n}\nvar strength = null;\nif (maxValueField != null && totalValue > 0) {\nstrength = (maxValue / totalValue) * 100;\n}\nreturn strength;",
  "stops": [
      "value": 25,
      "transparency": 85
      "value": 50,
      "transparency": 0
  "legendOptions": {
    "title": "Strength of predominance"

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