RPOrderedTask class Null safety

A simple linear task which implement the RPTask protocol. It shows the steps one after another without the option of going back or branching.

For simple tasks the RPOrderedTask is perfect. For more features (going back to previous questions, branching...) consider using RPNavigableOrderedTask which inherited from this class.



RPOrderedTask({required String identifier, required List<RPStep> steps, bool closeAfterFinished = true})
RPOrderedTask.fromJson(Map<String, dynamic> json)


$type String?
The runtime class name (type) of this object. Used for deserialization from JSON objects.
read / write, inherited
closeAfterFinished bool
If set to true the Task will close after the participant has finished the task. If it's set to false no navigation function is called. [...]
read / write, inherited
fromJsonFunction Function
The function which can convert a JSON string to an object of this type.
read-only, override
hashCode int
The hash code for this object. [...]
read-only, inherited
identifier String
A unique identifier of the Task. This identifier connects the Task to its result (RPTaskResult) object.
read / write, inherited
isConsentTask bool
Returns true if the task is a Consent Task. It is considered a Consent Task if it has an RPConsentReviewStep
jsonType String
Return the $type to be used for JSON serialization of this class. Default is runtimeType. Only specify this if you need another type.
read-only, inherited
numberOfQuestionSteps int
The number of question steps in the task
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
steps List<RPStep>
The list of RPSteps of the task
read / write


getStepAfterStep(RPStep? step, RPTaskResult? result) RPStep?
Returns the step after a specified step if there's any. If the specified step is null then it returns the first step. [...]
getStepBeforeStep(RPStep? step, RPTaskResult? result) RPStep?
Returns the step that precedes the specified step, if there is one. If the specified step is null then it returns the last step. [...]
getStepWithIdentifier(String identifier) RPStep?
Returns the step that matches the specified identifier. Returns null if there is no step with the identifier.
getTitleForStep(RPStep step) String
Returns the title of a given step
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toJson() Map<String, dynamic>
Return a JSON encoding of this object.
toString() String
A string representation of this object. [...]


operator ==(Object other) bool
The equality operator. [...]