Presentation > content > Content Modifier
Edit this page

Content modifier rule

TypeScript type: ContentModifier.

Content modifiers are used to modify how instances of specified ECClasses are displayed in content which is produced using content rules. They do not produce any content by themselves.

Attributes

Name Required? Type Default
Picking attributes
class No SingleSchemaClassSpecification Any class
requiredSchemas No RequiredSchemaSpecification[] []
priority No number 1000
Content Modifiers
relatedProperties No RelatedPropertiesSpecification[] []
calculatedProperties No CalculatedPropertiesSpecification[] []
propertyCategories No PropertyCategorySpecification[] []
propertyOverrides No PropertySpecification[] []

Attribute: class

Specification of ECClass whose content should be modified. The modifier is applied to all content if this attribute is not specified.

Type SingleSchemaClassSpecification
Is Required No
Default Value Any class 
// The ruleset has a content rule that returns content of all `bis.SpatialCategory` and `bis.GeometricModel`
// instances.There's also a content modifier that creates a custom calculated property only for `bis.Category` instances.
const ruleset: Ruleset = {
  id: "example",
  rules: [{
    ruleType: "Content",
    specifications: [{
      // load content for all `bis.SpatialCategory` and `bis.GeometricModel` instances
      specType: "ContentInstancesOfSpecificClasses",
      classes: { schemaName: "BisCore", classNames: ["SpatialCategory", "GeometricModel"] },
      handleInstancesPolymorphically: true,
    }],
  }, {
    ruleType: "ContentModifier",
    class: { schemaName: "BisCore", className: "Category" },
    calculatedProperties: [{
      label: "Calculated",
      value: `"PREFIX_" & this.CodeValue`,
    }],
  }],
};

Example of using class attribute

Attribute: requiredSchemas

A list of ECSchema requirements that need to be met for the rule to be used.

Type RequiredSchemaSpecification[]
Is Required No
Default Value [] 
// The ruleset has a content rule that returns content of given input instances. There's also
// a content modifier that tells us to load `bis.ExternalSourceAspect` related properties, but the
// ECClass was introduced in BisCore version 1.0.2, so the modifier needs a `requiredSchemas` attribute
// to only use the rule if the version meets the requirement.
const ruleset: Ruleset = {
  id: "example",
  rules: [{
    ruleType: "Content",
    specifications: [{
      // load content for given input instances
      specType: "SelectedNodeInstances",
    }],
  }, {
    ruleType: "ContentModifier",
    requiredSchemas: [{ name: "BisCore", minVersion: "1.0.2" }],
    class: { schemaName: "BisCore", className: "ExternalSourceAspect" },
    relatedProperties: [{
      // request to include properties of related ExternalSourceAspect instances
      propertiesSource: {
        relationship: { schemaName: "BisCore", className: "ElementOwnsMultiAspects" },
        direction: "Forward",
        targetClass: { schemaName: "BisCore", className: "ExternalSourceAspect" },
      },
    }],
  }],
};

Attribute: priority

Defines the order in which rules are handled, higher number means the rule is handled first. If priorities are equal, the rules are handled in the order they're defined.

Type number
Is Required No
Default Value 1000 
// The ruleset has a content rule that returns content of all `bis.SpatialCategory`
// instances.There's also a content modifier that tells us to hide all properties
// of `bis.Element` instances and a higher priority modifier that tells us to show
// its `CodeValue` property.
const ruleset: Ruleset = {
  id: "example",
  rules: [{
    ruleType: "Content",
    specifications: [{
      // load content of all `bis.SpatialCategory` instances
      specType: "ContentInstancesOfSpecificClasses",
      classes: { schemaName: "BisCore", classNames: ["SpatialCategory"] },
      handleInstancesPolymorphically: true,
    }],
  }, {
    ruleType: "ContentModifier",
    class: { schemaName: "BisCore", className: "SpatialCategory" },
    priority: 1,
    propertyOverrides: [{
      // hide all properties
      name: "*",
      isDisplayed: false,
    }],
  }, {
    ruleType: "ContentModifier",
    class: { schemaName: "BisCore", className: "SpatialCategory" },
    priority: 2,
    propertyOverrides: [{
      // display the CodeValue property
      name: "CodeValue",
      isDisplayed: true,
      doNotHideOtherPropertiesOnDisplayOverride: true,
    }],
  }],
};

Example of using priority attribute

Attribute: relatedProperties

Specifications of related properties which are included in the generated content.

Type RelatedPropertiesSpecification[]
Is Required No
Default Value [] 
// The ruleset has a content rule that returns content of given input instances. There's also
// a content modifier that includes properties of the related `bis.Category` for all `bis.GeometricElement3d`
// instances' content.
const ruleset: Ruleset = {
  id: "example",
  rules: [{
    ruleType: "Content",
    specifications: [{
      // load content for given input instances
      specType: "SelectedNodeInstances",
    }],
  }, {
    ruleType: "ContentModifier",
    class: { schemaName: "BisCore", className: "GeometricElement3d" },
    relatedProperties: [{
      propertiesSource: {
        relationship: { schemaName: "BisCore", className: "GeometricElement3dIsInCategory" },
        direction: "Forward",
      },
      handleTargetClassPolymorphically: true,
    }],
  }],
};

Example of using relatedProperties attribute

Attribute: calculatedProperties

Specifications of calculated properties whose values are generated using provided ECExpressions.

Type CalculatedPropertiesSpecification[]
Is Required No
Default Value [] 
// The ruleset has a content rule that returns content of given input instances. There's also
// a content modifier that creates a calculated property for `bis.GeometricElement3d` instances.
const ruleset: Ruleset = {
  id: "example",
  rules: [{
    ruleType: "Content",
    specifications: [{
      // load content for given input instances
      specType: "SelectedNodeInstances",
    }],
  }, {
    ruleType: "ContentModifier",
    class: { schemaName: "BisCore", className: "GeometricElement3d" },
    calculatedProperties: [{
      label: "Yaw & Pitch & Roll",
      value: `this.Yaw & " & " & this.Pitch & " & " & this.Roll`,
    }],
  }],
};

Example of using calculatedProperties attribute

Attribute: propertyCategories

Specifications for custom categories. Simply defining the categories does nothing - they have to be referenced from property specification defined in propertyOverrides by id.

Type PropertyCategorySpecification[]
Is Required No
Default Value [] 
// The ruleset has a content rule that returns content of given input instances. There's also
// a content modifier that moves all `bis.GeometricElement3d` properties into a custom category.
const ruleset: Ruleset = {
  id: "example",
  rules: [{
    ruleType: "Content",
    specifications: [{
      // load content for given input instances
      specType: "SelectedNodeInstances",
    }],
  }, {
    ruleType: "ContentModifier",
    class: { schemaName: "BisCore", className: "GeometricElement3d" },
    propertyCategories: [{
      id: "custom-category",
      label: "Custom Category",
    }],
    propertyOverrides: [{
      name: "*",
      categoryId: "custom-category",
    }],
  }],
};

Example of using propertyCategories attribute

Attribute: propertyOverrides

Specifications for various property overrides that allow customizing property display.

Type PropertySpecification[]
Is Required No
Default Value [] 
// The ruleset has a content rule that returns content of given input instances. There's also
// a content modifier that customizes display of `bis.GeometricElement3d` properties.
const ruleset: Ruleset = {
  id: "example",
  rules: [{
    ruleType: "Content",
    specifications: [{
      // load content for given input instances
      specType: "SelectedNodeInstances",
    }],
  }, {
    ruleType: "ContentModifier",
    class: { schemaName: "BisCore", className: "GeometricElement3d" },
    propertyOverrides: [{
      // force hide the UserLabel property
      name: "UserLabel",
      isDisplayed: false,
    }, {
      // force show the Parent property which is hidden by default through ECSchema
      name: "Parent",
      isDisplayed: true,
      doNotHideOtherPropertiesOnDisplayOverride: true,
    }, {
      // override label of CodeValue property
      name: "CodeValue",
      labelOverride: "Overriden Label",
    }],
  }],
};

Example of using propertyOverrides attribute

Last Updated: 20 June, 2023