api - UI Builder

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  • 更新日 2026年03月12日
  • 所要時間：58分

    • The api API provides methods that you can use when developing client scripts in the UI Builder.

    This API is exposed to client scripts, also known as page scripts. Client scripts are executed in response to something happening on a page, such as:
    • User interaction events/actions, such as a button click.
    • Lifecycle events, such as a data broker execution started.
    These scripts do not have to return anything to the framework and can be written as an asynchronous function.
    This API is also exposed to scripted property values. These scripts are executed whenever the framework-runtime needs to calculate a value, such as:
    • Passing to a component property.
    • Determining component visibility.
    • Emitting an event with a payload.
    These scripts cannot be written as an asynchronous function. They also cannot invoke side-effect methods on the api object, such as, api.emit(), api.setState(), and api.data.<data_resource_id>.*().

    The api object contains both configuration dependent and configuration independent properties that you can access within the context of the associated page or component. You cannot directly modify the properties within this object. Modification can only be made through the available methods.

    api - api.context.props.<page_property_name>

    Page properties can be configured within UI Builder. The configuration values depend on the context in which the page is used.

    表 : 1. Field
    Name Type Description
    <page_property_name> Any Available values are dependant on the client script implementation.

    To access these properties, use the following: api.context.props.<page_property_name>.

    For example: 
    // A record page with property table could be accessed with
function isActivityStreamVisible({api}) {
  return api.context.props.table === 'incident';
}
    注:
    These property values are read-only. Mutating nested object values from scripts is not supported.

    api - api.context.session.<session_property>

    Context session properties associated with the current user.

    表 : 2. Available session properties
    Name Type Description
    isLoggedIn Boolean Flag that indicates whether the current user is logged in to the system.
    Possible values:
    • true: Current user is logged in to
    • false: Current user is not logged in.
    properties.awaEnabled String The system property glide.awa.enabled that indicates whether the auto assignment for work items for Advanced Work Assignment (AWA) is enabled for the current user.
    Possible values:
    • true: AWA is enabled for the user.
    • false: AWA is not enabled for the user.

    For additional information, see Components installed with Advanced Work Assignment.
    properties.forgetMe.value String The property glide.ui.forgetme that indicates whether to remove the Remember Me check box from the login page to prevent login information from being cached.
    Possible values:
    • true: Remove the Remember Me check box.
    • false: Display the Remember Me check box.

    For additional information, see Remove remember me.
    properties.sessionTimeLeft.value String

    Number coerced to string

    		 The system property glide.ui.session_timeleft that determines the mount of time left before the current session times out. Use this property to prompt the user to extent the current session before it times out.

    Unit: Minutes
    properties.sessionTimeout.value String

    Number coerced to string

    		 The system property glide.ui.session_timeout that determines the initial session time out value.

    Unit: Minutes - Values greater than 1440 minutes are treated as one day.

    For additional information, see Session activity timeout
    properties.trackingEnabled.value String The system property glide.uxbuilder.tracking.enabled that indicates whether to enable/disable web analytics library loading and instantiation for UI Builder based applications.
    Possible values:
    • true: Enabled for the user.
    • false: Disabled for the user.
    user.avatar String URL of the current user's avatar.
    user.dateFormat String Default date format.
    user.domain String Domain path for the current user.
    user.firstName String First name of the current user.
    user.fullName String First and last name of the current user.
    user.initials String Initials of the current user.
    user.language String Primary language spoken by the current user.
    user.preferences Array of objects Name-value pairs that describe the user preferences. These user preferences are stored as records in the User Preference [sys_user_preference] table, and are updated each time the user changes their settings.

    For additional information, see Exploring user administration.
    user.roles Array Comma-separated list of roles assigned to the current user.
    注:
    If the user has no roles assigned, this context session property returns null rather than an empty array.
    user.sys_id String Sys_id of the user in the User [sys_user] table.
    user.timeFormat String Default time format to use for the user.
    user.timeZone String Time zone of the current user.
    user.timeZoneOffset String Time zone offset of the current user.

    api - api.data.<data_resource_id>.lifecycle.lastFetchSucceeded

    Boolean flag that indicates whether the last fetch attempt for the specified data resource instance finished successfully.

    If the value is true, the last fetch attempt for the data resource instance finished successfully; otherwise, false.

    表 : 3. Field
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.

    api - api.data.<data_resource_id>.addErrorMessage(Object payload)

    Displays the specified error message at the top of the current form.

    表 : 4. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the error message to display.
    "payload": {
  "message": "String"
}
    payload.message String Error message to display.
    表 : 5. Returns
    Type Description
    None 

    api.data.gform.addErrorMessage({message: 'Error message'});

    api -api.data.<data_resource_id>.addInfoMessage(Object payload)

    Displays the specified informational message at the top of the current form.

    表 : 6. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the informational message to display.
    "payload": {
  "message": "String"
}
    payload.message String Informational message to display.
    表 : 7. Returns
    Type Description
    None 

    api.data.gform.addInfoMessage({message: 'Test message'});

    api - api.data.<data_resource_id>.addOption(Object payload)

    Adds an option to the specified choice type field.

    表 : 8. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the field value to update.
    "payload": {
  "choiceIndex": "String",
  "choiceLabel": "String",
  "choiceValue": "String",
  "fieldName": "String"
}
    payload.choiceIndex String Optional. Index into the choice list at which to insert the option.

    Default: End of the choice list.
    payload.choiceLabel String Label of the option to add to the specified field.
    payload.choiceValue String Value of the option to add to the specified field.
    payload.fieldName String Name of the choice type form field to add the specified option to.
    表 : 9. Returns
    Type Description
    None 

    api.data.gform.addOption({fieldName: 'priority', choiceLabel: 'Extremely High', choiceValue: '10'});

    api - api.data.<data_resource_id>.addWarningMessage(Object payload)

    Displays the specified warning message at the top of the current form.

    表 : 10. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the warning message to display.
    "payload": {
  "message": "String"
}
    payload.message String Warning message to display.
    表 : 11. Returns
    Type Description
    None 

    api.data.gform.addWarningMessage({message: 'Test message'});

    api - api.data.<data_resource_id>.clearMessage()

    Removes all informational and error messages from the top of the current form.

    表 : 12. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    表 : 13. Returns
    Type Description
    None 

    api.data.gform.clearMessage();

    api - api.data.<data_resource_id>.clearOptions(Object payload)

    Clears all options from the specified choice type field.

    表 : 14. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the choice type field whose options are to be cleared.
    "payload": {
  "fieldName": "String"
}
    payload.fieldName String Name of the choice type field whose options are to be cleared.
    表 : 15. Returns
    Type Description
    None 

    api.data.gform.clearOptions({fieldName: 'priority'});

    api - api.data.<data_resource_id>.executeUiAction(Object payload)

    Executes the specified UI action.

    表 : 16. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Description of the UI action to execute.
    "payload": {
  "actionSysId": "String"
}
    payload.actionSysId String Sys_id of the UI action to execute.

    Table: UI Action [sys_ui_action]
    表 : 17. Returns
    Type Description
    None

    The following code example shows how to call this method.

    api.data.gform.executeUiAction({actionSysId: '60615ff90f730010ac7de6f8c4767e9a'});

    api - api.data.<data_resource_id>.execute(Object inputValues)

    Triggers an execute operation on the specified data resource.

    This method is only available if the data resource is one of the following types:
    • Composite
    • GraphQL
    • REST
    • Scriptlet
    • Transform
    注:
    This method is only exposed if the mutates_server_data field is set to true on the corresponding data resource (sys_ux_data_broker_* table) record. It is accessible under api.data.<data_resource_Id>.refresh().
    表 : 18. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource. The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    inputValues Object Object to pass to the specified data resource. This object must conform to the data resource's input parameters.
    表 : 19. Returns
    Type Description
    None

    This code example shows a page script that is invoked when the Submit button on the page is clicked. The page is configured wit a Server Data Resource tat creates a new record.

    function handler({api}) {
  if (api.state.movieYear === 2020) {
    // The data resource used in this case specifies two input parameters: name and year
    api.data.create_movie_record.execute({
      name: api.state.movieName,
      year: api.state.movieYear
    });
  }
}

    api - api.data.<data_resource_id>.hideFieldMessage(Object payload)

    Hides the oldest message next to the specified field or clears all messages associated with the field.

    表 : 20. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the field message to hide.
    "payload": {
  "clearAll": Boolean,
  "fieldName": "String"
}
    payload.clearAll Boolean Optional. Flag that indicates whether to clear all messages associated with the specified form field.
    Valid values:
    • true: Clear all messages associated with the specified field.
    • false: Do not clear all messages associated with the specified field.

    Default: false
    payload.fieldName String Name of the form field for which to hide the oldest message or clear all associated messages.
    表 : 21. Returns
    Type Description
    None 

    api.data.gform.hideFieldMessage({fieldName: 'short_description'});

    api - api.data.<data_resource_id>.hideRelatedList(Object payload)

    Hides the specified related list on the current form.

    表 : 22. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the related list to hide.
    "payload": {
  "listTableName ": "String"
}
    payload.listTableName String Name of the related list to hide. If the list to hide is through a relationship, provide the sys_id of the list instead of the name.

    Table: Related List [sys_ui_related_list]
    表 : 23. Returns
    Type Description
    None

    The following code example shows how to call this method.

    api.data.gform.hideRelatedList({listTableName:'incident.parent_incident'});

    api - api.data.<data_resource_id>.hideRelatedLists()

    Hides all related lists on the current form.

    表 : 24. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    表 : 25. Returns
    Type Description
    None 

    api.data.gform.hideRelatedLists();

    api - api.data.<data_resource_id>.refresh()

    Triggers a refresh operation for the specified non-mutating data resource instance.

    Call this method if the underlying data being fetched by the data resource changes. A data resource is considered non-mutating if the mutates_server_data field on the record is set to false.

    This method is asynchronous and emits an internal event to trigger the refresh of the specified data resource instance. The UI Builder allows you to trigger client scripts in response to data resource lifecycle events, such as DATA_FETCH_SUCCEEDED and DATA_FETCH_FAILED. For additional information on these events, see Event mapping.

    This method is only available if the data resource is one of the following types:
    • Composite
    • GraphQL
    • REST
    • Scriptlet
    • Transform
    注:
    This method is only exposed if the mutates_server_data field is set to false on the corresponding data resource (sys_ux_data_broker_* table) record.
    表 : 26. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource. The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    表 : 27. Returns
    Type Description
    None

    This code example shows a page script that is invoked when a dropdown item is selected in a page. The page is configured with two Server Data Resources that query problem and incident tables.

    function handler({api, event}) {
  const value = event.payload.value[0];
  if (value === 'problem')
    api.data.problem_list_1.refresh();
  else if(value === 'incident')
    api.data.incident_list_1.refresh();
}

    api - api.data.<data_resource_id>.reload()

    Reloads the current form using the same table and sys_id.

    表 : 28. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    表 : 29. Returns
    Type Description
    None 

    api.data.gform.reload();

    api - api.data.<data_resource_id>.removeOption(Object payload)

    Removes an option from the specified choice type field.

    表 : 30. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the choice type field to update.
    "payload": {
  "choiceValue": "String",
  "fieldName": "String"
}
    payload.choiceValue String Value of the option to remove from the specified choice type field.
    payload.fieldName String Name of the choice type form field from which to remove the specified value.
    表 : 31. Returns
    Type Description
    None 

    api.data.gform.removeOption({fieldName: 'priority', choiceValue: '1'});

    api - api.data.<data_resource_id>.save()

    Triggers form submission using the Save UI action.

    表 : 32. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    表 : 33. Returns
    Type Description
    None 

    api.data.gform.save();

    api - api.data.<data_resource_id>.setMandatory(Object payload)

    Sets whether the specified form field is mandatory.

    表 : 34. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the field whose mandatory information to update.
    "payload": {
  "fieldName": "String",
  "mandatory": Boolean
}
    payload.fieldName String Name of the form field whose mandatory value is to be set.
    payload.mandatory Boolean Flag that indicates the specified form field is mandatory, meaning the form cannot be saved without this field containing a valid value.
    Valid values:
    • true: Field is mandatory.
    • false: Field is optional.
    表 : 35. Returns
    Type Description
    None 

    api.data.gform.setMandatory({fieldName: 'short_description', mandatory: false});

    api - api.data.<data_resource_id>.setReadOnly(Object payload)

    Sets the read/write capabilities of the specified form field.

    表 : 36. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the field whose readability information to update.
    "payload": {
  "fieldName": "String",
  "readonly": Boolean
}
    payload.fieldName String Name of the form field whose readability is to be set.
    payload.readonly Boolean Flag that indicates the read/write capabilities of the specified form field.
    Valid values:
    • true: Field is read only.
    • false: Field is read/write.
    表 : 37. Returns
    Type Description
    None 

    api.data.gform.setReadOnly({fieldName: 'short_description', readonly: false});

    api -api.data.<data_resource_id>.setValue(Object payload)

    Updates a specified GlideForm field with the specified value. Optionally, you can also update the display value with the same specified value.

    Only the value on the form is updated. The value is not saved in the database.

    表 : 38. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the field whose value to update.
    "payload": {
  "displayValue": "String",
  "fieldName": "String",
  "value": "String"
}
    payload.displayValue String Optional. Name of the display value to update. If left blank, the display value is not modified.
    payload.fieldName String Name of the form field to update.
    payload.value String Value to update the field with.
    表 : 39. Returns
    Type Description
    None 

    api.data.gform.setValue({fieldName: 'short_description', value: 'short description'});

    api - api.data.<data_resource_id>.setVisible(Object payload)

    Sets the visibility of the specified form field.

    表 : 40. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the field on which to set visibility.
    "payload": {
  "fieldName": "String",
  "visibility": Boolean
}
    payload.fieldName String Name of the form field whose visibility is to be set.
    payload.visibility Boolean Flag that indicates whether the associated field is visible on the current form.
    Valid values:
    • true: Field will display on the form.
    • false: Field will not display on the form.
    表 : 41. Returns
    Type Description
    None 

    api.data.gform.setVisible({fieldName: 'short_description', visibility: false});

    api - api.data.<data_resource_id>.showFieldMessage(Object payload)

    Displays the specified message next to the specified field.

    表 : 42. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the field message to display.
    "payload": {
  "fieldName": "String",
  "message": "String",
  "type": "String"
    payload.fieldName String Name of the field next to which the message should appear.
    payload.message String Message to display.
    payload.type String Optional. Type of message to display.
    Valid values:
    • error
    • info
    • warning

    Default: info
    表 : 43. Returns
    Type Description
    None 

    api.data.gform.showFieldMessage({fieldName: 'short_description', message: 'Error message', type: 'error'});

    api - api.data.<data_resource_id>.showRelatedList(Object payload)

    Displays the specified related list on the current form.

    表 : 44. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the related list to display.
    "payload": {
  "listTableName ": "String"
}
    payload.listTableName String Name of the related list to display. If the list to display is through a relationship, provide the sys_id of the list instead of the name.

    Table: Related List [sys_ui_related_list]
    表 : 45. Returns
    Type Description
    None

    The following code example shows how to call this method.

    api.data.gform.showRelatedList({listTableName:'incident.parent_incident'});

    api - api.data.<data_resource_id>.showRelatedLists()

    Displays all related lists associated with the current form.

    表 : 46. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    表 : 47. Returns
    Type Description
    None 

    api.data.gform.showRelatedLists();

    api - api.data.<data_resource_id>.submit()

    Triggers form submission using the specified UI action.

    表 : 48. Parameters
    Name Type Description
    data_resource_id String Unique identifier of the associated data resource.

    In most cases, you can use the Form Controller CTRL_RECORD#SAVE_FORM action. If the record page has the Record Page Tabs component, the data resource for this method must be based off of GlideForm (g_form).

    The available data resource instances are configuration-dependent and defined when you add the data resource to your page in UI Builder.
    payload Object Object that describes the UI action to use to submit the current form.
    "payload": {
  "submitActionName": "String"
}
    payload.submitActionName String Name of the UI action to execute to submit the current form.
    表 : 49. Returns
    Type Description
    None 

    api.data.gform.submit({submitActionName:'sysverb_ws_save'});

    api - api.emit(String eventName, Object payload)

    Emits an event with the specified name and payload.

    The event name being emitted must be part of the associated page definition's dispatched events list, which is stored in the UX Macroponent Definition [sys_ux_macroponent] table. Any api.emit call that dispatches events not declared in this table are ignored.

    For additional information on events, see Work with events.

    表 : 50. Parameters
    Name Type Description
    eventName String Name of the event to emit. This name should follow the UI Framework action naming guidelines:
    • Should be upper snake case, such as ITEM_CHANGED. All letters in upper case and all spaces replaced with underscores.
    • Should be past tense, such as BUTTON_CLICKED or USER_SELECTED.

    For additional information on these action naming guidelines, see https://developer.servicenow.com/dev.do#!/reference/now-experience/sandiego/ui-framework/main-concepts/dispatching-actions.
    payload Object Optional. Object that contains the data to send with the emitted event. This object is free-form and can contain whatever data is necessary by the entity receiving the data.
    注:
    Payloads of primitive type work, but could result in inconsistent behavior.
    表 : 51. Returns
    Type Description
    None

    The following code example shows emitting an event called NOW_UXF_PAGE#ADD_NOTIFICATIONS with an associated items payload.

    function handler({api}) { 
  api.emit('NOW_UXF_PAGE#ADD_NOTIFICATIONS', { 
    items: [
      { 
        id: 'alert1', 
        status: 'positive', 
        icon: 'check-circle-outline', 
        content: 'Here is some information!', 
        textLinkProps: { 
          label: 'More info',
          href: 'https://www.servicenow.com' 
        }, 
      action: {type: 'acknowledge'} 
      } 
    ] 
  }); 
}

    api - setState(String stateParam, Any value)

    Sets the value of the specified client state parameter.

    Use client state parameters to maintain a shared state on a page. The shared state can then be passed as values to properties of components used on the page. You can also access and update client states in multiple page scripts. A common use case is to keep track of values input by users in multiple form controls on a page. When the form is submitted, a client script could then use all of the values stored in client state parameters to create a new record with a data broker. A page can have one or more client state parameters, which you can declare for a page through the UI Builder. You can then bind a client state parameter to one or more components to share or act on the client state parameter.

    api.setState() calls are executed asynchronously and do not necessarily update the UI immediately. If the value to set depends on the currentValue of the client state parameter, or any of the properties provided in the api object, you should use this variant of the api.setState() method to avoid using outdated values.

    表 : 52. Parameters
    Name Type Description
    stateParm String Name of the client state parameter to update. This name must be declared in the client state parameters of the associated page.

    For additional information on declaring client state parameters, see Work with client state parameters.
    value Any - Must be the same as the client state parameter declaration. Value to set the specified client state parameter to.
    表 : 53. Returns
    Type Description
    None

    This example shows a script that could be executed to update the email client state parameter when an input value is set on a now-input component.

    function handler({api, event}) {
    api.setState('email', event.payload.value);
}

    api - setState(String stateParam, Function callbackFn)

    Sets the value of the specified client state parameter to the value returned by the specified callback function.

    The callback function is invoked with an object that has two properties: currentValue and api. The function should never mutate the currentValue property or the api object directly.

    Use client state parameters to maintain a shared state on a page. The shared state can then be passed as values to properties of components used on the page. You can also access and update client states in multiple page scripts. A common use case is to keep track of values input by users in multiple form controls on a page. When the form is submitted, a client script could then use all of the values stored in client state parameters to create a new record with a data broker. A page can have one or more client state parameters, which you can declare for a page through the UI Builder. You can then bind a client state parameter to one or more components to share or act on the client state parameter.

    api.setState() calls are executed asynchronously and do not necessarily update the UI immediately. If the value to set depends on the currentValue of the client state parameter, or any of the properties provided in the api object, you should use this variant of the api.setState() method to avoid using outdated values.

    表 : 54. Parameters
    Name Type Description
    stateParm String Name of the client state parameter to update. This name must be declared in the client state parameters of the associated page.

    For additional information on declaring client state parameters, see Work with client state parameters.
    callbackFn Function Callback function to execute to obtain the value.
    表 : 55. Returns
    Type Description
    None

    This example shows how to use api.setState to log users into a page.

    function handler({api, event}) {
  const {name, value} = event.payload;
  if (name === 'username' || name === 'password') {
    // Update the loginParameters state object with the username/password value
    api.setState('loginParameters', ({currentValue}) => {
      return {
        ...currentValue,
        [name]: value
      };
    });
  }
}

    api - api.state.<client_state_parameter_name>

    Current value of the specified client state parameter.

    表 : 56. Field
    Name Type Description
    <client_state_parameter_name> Any. The available client state parameters are dependent on the page configuration. Name of the client state parameter. Available client states are dependant on the client script implementation.

    To access the available client states, use the following: api.state.<client_state_name>.

    For example: 
    function showRelatedLists({api}) { 
  return !api.state.isCustomListSelected; 
}
    注:
    These property values are read-only. To update a client state parameter, use api.setState(). Mutating nested object values from scripts is not supported.