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Property specification

TypeScript type: PropertySpecification.

This specification allows overriding some attributes of specific ECProperty or define how it's displayed.

Attributes

Name Required? Type Default
name Yes string
overridesPriority No number 1000
labelOverride No string No override
categoryId No string | CategoryIdentifier No override
isDisplayed No boolean | string No override
doNotHideOtherPropertiesOnDisplayOverride No boolean false
renderer No RendererSpecification No override
editor No PropertyEditorSpecification No override
isReadOnly No boolean No override
priority No number No override

Attribute: name

Name of the ECProperty to apply overrides to.

A [*] suffix may be used for array properties to target their items rather than arrays themselves, for example: MyArrayProperty[*]. In this case, only renderer and editor overrides have effect.

A "*" may be specified to match all properties in current context. The current context is determined based on where the override is specified:

Type string
Is Required Yes

Attribute: overridesPriority

There may be multiple property specifications that apply to a single property and there may be conflicts between different attributes. The overridesPriority attribute is here to help solve the problem - if multiple specifications attempt to override the same attribute, the override of specification with highest overridesPriority value is used. The order of overrides from specification with the same overridesPriority is defined by the order they appear in the overrides list.

Type number
Is Required No
Default Value 1000
// There's a content rule for returning content of given `bis.Subject` instance. In addition, the `UserLabel` // property has a couple of property overrides which set renderer, editor and label. The label is // overriden by both specifications and the one with higher `overridesPriority` takes precedence. const ruleset: Ruleset = { id: "example", rules: [ { ruleType: "Content", specifications: [ { specType: "SelectedNodeInstances", propertyOverrides: [ { name: "UserLabel", overridesPriority: 1, labelOverride: "A", renderer: { rendererName: "my-renderer", }, }, { name: "UserLabel", overridesPriority: 2, labelOverride: "B", editor: { editorName: "my-editor", }, }, ], }, ], }, ], };

Example of using a "overrides priority" attribute

Attribute: labelOverride

This is an attribute that allows overriding the property label. May be localized.

Type string
Is Required No
Default Value No override
// There's a content rule for returning content of given `bis.Subject` instance. In addition, the `UserLabel` // property has a label override that relabels it to "Custom Label". const ruleset: Ruleset = { id: "example", rules: [ { ruleType: "Content", specifications: [ { specType: "SelectedNodeInstances", propertyOverrides: [ { name: "UserLabel", labelOverride: "Custom Label", }, ], }, ], }, ], };

Example of using a "label override" attribute

Attribute: categoryId

The attribute allows moving the property into a different category. There are several options:

  • Reference a category by ID used in PropertyCategorySpecification in the current context. The current context contains categories specified in the same content specification or content modifiers that are applied on the same or base ECClass as this property specification.

  • Move to DefaultParent category. This is useful when using with related properties, to avoid putting them inside a special related class category and instead show them next to properties of the source class.

  • Move to Root category. This is useful when using with related properties, to avoid putting them inside a special related class category and instead show them in the root category.

See property categorization page for more details.

Type string | CategoryIdentifier
Is Required No
Default Value No override
// There's a content rule for returning content of given `bis.Subject` instance. In addition, the `UserLabel` // property is placed into a custom category by assigning it a `categoryId`. const ruleset: Ruleset = { id: "example", rules: [ { ruleType: "Content", specifications: [ { specType: "SelectedNodeInstances", propertyCategories: [ { id: "custom-category", label: "Custom Category", }, ], propertyOverrides: [ { name: "UserLabel", categoryId: "custom-category", }, ], }, ], }, ], };

Example of using a "category id" attribute

Attribute: isDisplayed

This attribute controls whether the particular property is present in the result, even when it is marked as hidden in the ECSchema. The allowed settings are:

  • Omitted or undefined: property visibility is controlled by the ECSchema.
  • true: property is made visible. Warning: this will automatically hide all other properties of the same class. If this behavior is not desirable, set doNotHideOtherPropertiesOnDisplayOverride attribute to true.
  • false: property is made hidden.
  • The value can be set using an ECExpression. Warning: this will automatically hide all other properties of the same class, no matter what the expression evaluates to. If this behavior is not desirable, set doNotHideOtherPropertiesOnDisplayOverride attribute to true.
Type boolean | ECExpression
Is Required No
Default Value No override

Using isDisplayed attribute with boolean value

// There's a content rule for returning content of given `bis.Subject` instance. In addition, // the `LastMod` property, which is hidden using a custom attribute in ECSchema, is force-displayed // using a property override. const ruleset: Ruleset = { id: "example", rules: [ { ruleType: "Content", specifications: [ { specType: "SelectedNodeInstances", propertyOverrides: [ { name: "LastMod", isDisplayed: true, }, ], }, ], }, ], };

Example of using a "is displayed" attribute with boolean value

Using isDisplayed attribute with ECExpression value

// There's a content rule for returning content of given `bis.Subject` instance. In addition, // the display of `UserLabel` property is controlled using a ruleset variable. const ruleset: Ruleset = { id: "example", rules: [ { ruleType: "Content", specifications: [ { specType: "SelectedNodeInstances", propertyOverrides: [ { name: "UserLabel", isDisplayed: `GetVariableBoolValue("SHOW_LABEL")`, }, ], }, ], }, ], };
Ruleset variable values Result
SHOW_LABEL = false Example of using a "is displayed" attribute with ECExpression that evaluates to `false`
SHOW_LABEL = true Example of using a "is displayed" attribute with ECExpression that evaluated to `true`

Attribute: doNotHideOtherPropertiesOnDisplayOverride

This attribute controls whether making the property visible using isDisplayed should automatically hide all other properties of the same class. When true, this behavior is disabled.

Type boolean
Is Required No
Default Value false
// There's a content rule for returning content of given `bis.Subject` instance. In addition, // the `UserLabel` property is set to be displayed with `doNotHideOtherPropertiesOnDisplayOverride` flag, // which ensures other properties are also kept displayed. const ruleset: Ruleset = { id: "example", rules: [ { ruleType: "Content", specifications: [ { specType: "SelectedNodeInstances", propertyOverrides: [ { name: "UserLabel", isDisplayed: true, doNotHideOtherPropertiesOnDisplayOverride: true, }, ], }, ], }, ], };
doNotHideOtherPropertiesOnDisplayOverride: false doNotHideOtherPropertiesOnDisplayOverride: true
Example of using "do not hide other properties on display override" attribute set to "false" Example of using "do not hide other properties on display override" attribute set to "true"

Attribute: renderer

Custom property renderer specification that allows assigning a custom value renderer to be used in UI. The specification is used to set up Field.renderer for this property and it's up to the UI component to make sure appropriate renderer is used to render the property.

See Custom property value renderers page for a list of available renderers or how to register a custom one.

Type RendererSpecification
Is Required No
Default Value No override
// There's a content rule for returning content of given `bis.Subject` instance. In addition, // it assigns the `CodeValue` property a custom "my-renderer" renderer. const ruleset: Ruleset = { id: "example", rules: [ { ruleType: "Content", specifications: [ { specType: "SelectedNodeInstances", propertyOverrides: [ { name: "CodeValue", renderer: { rendererName: "my-renderer", }, }, ], }, ], }, ], };
// Ensure the `CodeValue` field is assigned the "my-renderer" renderer const content = (await Presentation.presentation.getContentIterator({ imodel, rulesetOrId: ruleset, keys: new KeySet([{ className: "BisCore:Subject", id: "0x1" }]), descriptor: {}, }))!; expect(content.descriptor.fields).to.containSubset([ { label: "Code", renderer: { name: "my-renderer", }, }, ]);

Attribute: editor

Custom property editor specification that allows assigning a custom value editor to be used in UI.

Type PropertyEditorSpecification
Is Required No
Default Value No override
// There's a content rule for returning content of given `bis.Subject` instance. In addition, // it assigns the `UserLabel` property a custom "my-editor" editor. const ruleset: Ruleset = { id: "example", rules: [ { ruleType: "Content", specifications: [ { specType: "SelectedNodeInstances", propertyOverrides: [ { name: "UserLabel", editor: { editorName: "my-editor", }, }, ], }, ], }, ], };
// Ensure the `UserLabel` field is assigned the "my-editor" editor const content = (await Presentation.presentation.getContentIterator({ imodel, rulesetOrId: ruleset, keys: new KeySet([{ className: "BisCore:Subject", id: "0x1" }]), descriptor: {}, }))!; expect(content.descriptor.fields).to.containSubset([ { label: "User Label", editor: { name: "my-editor", }, }, ]);

Attribute isReadOnly

This attribute controls whether the property field is read-only. If the attribute value is not set, the field is read-only when at least one of the properties is read-only.

Type boolean
Is Required No
Default Value No override
// There's a content rule for returning content of given `bis.Subject` instance. In addition, the `UserLabel` // property is made read-only. const ruleset: Ruleset = { id: "example", rules: [ { ruleType: "Content", specifications: [ { specType: "SelectedNodeInstances", propertyOverrides: [ { name: "UserLabel", isReadOnly: true, }, ], }, ], }, ], };
// Ensure the `UserLabel` field is read-only. const content = (await Presentation.presentation.getContentIterator({ imodel, rulesetOrId: ruleset, keys: new KeySet([{ className: "BisCore:Subject", id: "0x1" }]), descriptor: {}, }))!; expect(content.descriptor.fields).to.containSubset([ { label: "User Label", isReadonly: true, }, ]);

Attribute priority

This attribute controls the order in which property fields should be displayed. Property fields with higher priority will appear before property fields with lower priority. If the attribute value is not set, the field's priority will be the maximum priority of its properties.

Type number
Is Required No
Default Value No override
// There's a content rule for returning content of given `bis.Subject` instance. In addition, the `UserLabel` // property's priority is set to 9999. const ruleset: Ruleset = { id: "example", rules: [ { ruleType: "Content", specifications: [ { specType: "SelectedNodeInstances", propertyOverrides: [ { name: "UserLabel", priority: 9999, }, ], }, ], }, ], };
priority: 0 priority: 9999
Example when "priority" attribute value is set to 0 Example when "priority" attribute value is set to 9999

Last Updated: 29 April, 2025