N/task Module
RecordActionTask.paramCallback
Description: Property of type function that takes record ID and returns the parameter object for the specified record ID. Is to be used in conjunction with task.ActionCondition. This parameter cannot be specified when RecordActionTask.params is specified.
Supported Script Types: Server scripts For more information, see SuiteScript 2.0 Script Types.
Governance: None
Module: N/task Module
Sibling Object Members: RecordActionTask Object Members
Since: 2019.1
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=RecordActionTask.paramCallback

// Code Example 1

// Add additional code

//...

  var recordActionTask = task.create({taskType: task.TaskType.RECORD_ACTION});

  recordActionTask.recordType = 'timebill';

  recordActionTask.action = 'approve';

  recordActionTask.condition = task.ActionCondition.ALL_QUALIFIED_INSTANCES;

  recordActionTask.paramCallback = function(v) {

    return { recordId: v, note: "this is a note for " + v };

  };

  var handle = recordActionTask.submit();

//...

// Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_1544131790.html