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Class: MultipleResponsePart

Numbas.parts.MultipleResponsePart

new MultipleResponsePart(pathopt, question, parentPart, storeopt)

Multiple choice part - either pick one from a list, pick several from a list, or match choices with answers (2d grid, either pick one from each row or tick several from each row)

Types:

  • 1_n_2: pick one from a list. Represented as N answers, 1 choice
  • m_n_2: pick several from a list. Represented as N answers, 1 choice
  • m_n_x: match choices (rows) with answers (columns). Represented as N answers, X choices.
Parameters:
Name Type Attributes Default Description
path Numbas.parts.partpath <optional>
 'p0'
question Numbas.Question
parentPart Numbas.parts.Part
store Numbas.storage.BlankStorage <optional>
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Extends

Members

alternativeFeedbackMessage :string

Feedback message shown if this part is used as an alternative.

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alternatives :Array.<Numbas.parts.Part>

Child alternative parts.

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answered :boolean

Has this part been answered?

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creditFraction :Numbas.math.Fraction

Credit as a fraction. Used to avoid simple floating point errors.

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customName :string

Custom name for this part, or null if none. Variables will be substituted into this string from the part's scope.

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display :Numbas.display.PartDisplay

Associated display object. It is not safe to assume this is always present - in the editor, parts have no display.

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doesMarking :boolean

Does this mark do any marking? False for information only parts.

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finalised_result :Numbas.marking.finalised_state

The result of the last marking run.

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flipped :boolean

Have choice and answers been swapped (because of the weird settings for 1_n_2 and m_n_2 parts)?

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gaps :Array.<Numbas.parts.Part>

Child gapfill parts.

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isDirty :boolean

Has the student changed their answer since last submitting?

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json :object

JSON defining this part.

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locked :boolean

Is this part locked? If false, the student can change and submit their answer.

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markingFeedback :Array.<Numbas.parts.feedbackmessage>

Messages explaining how marks were awarded.

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markingScript :Numbas.marking.MarkingScript

The script to mark this part - assign credit, and give messages and feedback.

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marks :number

Maximum marks available for this part.

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name :string

A readable name for this part, to show to the student. Change it with Numbas.parts.Part#setName.

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numAnswers :number

Number of answers.

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numChoices :number

Number of choices - used by m_n_x parts.

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parentPart :Numbas.parts.Part

Reference to parent of this part, if this is a gap or a step.

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path :Numbas.parts.partpath

A question-wide unique 'address' for this part.

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question :Numbas.Question

The question this part belongs to.

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revealed :boolean

Has the answer to this part been revealed?

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score :number

Student's score on this part.

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settings

Properties set when the part is generated. Extends Numbas.parts.Part#settings.

Properties:
Name Type Description
markingMethod string

The marking method to use for "choose several" or "match choices with answers" parts - one of sum ticked cells, score per matched cell or all-or-nothing.
maxMarksEnabled boolean

Is there a maximum number of marks the student can get?
minAnswersString string

Minimum number of responses the student must select, without variables substituted in.
maxAnswersString string

Maximum number of responses the student must select, without variables substituted in.
minAnswers number

Minimum number of responses the student must select. Generated from minAnswersString.
maxAnswers number

Maximum number of responses the student must select. Generated from maxAnswersString.
shuffleChoices string

Should the order of choices be randomised?
shuffleAnswers string

Should the order of answers be randomised?
matrix Array.<Array.<number>>

Marks for each answer/choice pair. Arranged as matrix[answer][choice].
displayType string

How to display the response selectors. Can be radiogroup, checkbox or dropdownlist.
displayColumns number

How many columns to use to display the choices.
warningType string

What to do if the student picks the wrong number of responses? Either none (do nothing), prevent (don't let the student submit), or warn (show a warning but let them submit).
layoutType string

The kind of layout to use. See Numbas.parts.MultipleResponsePart.layoutTypes.
layoutExpression JME

Expression giving a 2d array or matrix describing the layout when layoutType is 'expression'.
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shouldResubmit :boolean

True if this part should be resubmitted because another part it depended on has changed.

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signals :Numbas.schedule.SignalBox

Signals produced while loading this part.

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stagedAnswer :Array.<string>

Student's answers as visible on the screen (not necessarily yet submitted).

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steps :Array.<Numbas.parts.Part>

Child step parts.

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stepsMarks :number

Marks available for the steps, if any.

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stepsOpen :boolean

Is the steps display open?

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stepsShown :boolean

Have the steps been show for this part?

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store :Numbas.storage.BlankStorage

Storage engine.

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ticks :Array.<Array.<boolean>>

Student's last submitted answer/choice selections.

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type :string

This part's type, e.g. "jme", "numberentry", ...

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useCustomName :boolean

Should a custom name be used?

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warnings :Array.<string>

Warnings shown next to the student's answer.

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xml :Element

XML defining this part.

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(static) layoutTypes :Object.<function()>

Layouts for multiple response types.

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Methods

addAlternative(alternative, index)

Add an alternative to this part.

Parameters:
Name Type Description
alternative Numbas.parts.Part
index number

Position of the alternative.
Fires:
  • Numbas.Part#event:addAlternative
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addCredit(credit, message)

Add an absolute value to credit.

Parameters:
Name Type Description
credit number

Amount to add.
message string

Message to show in feedback to explain this action.
Fires:
  • Numbas.Part#event:addCredit
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addStep(step, index)

Add a step to this part.

Parameters:
Name Type Description
step Numbas.parts.Part
index number

Position of the step.
Fires:
  • Numbas.Part#event:addStep
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addVariableReplacement(variable, part, must_go_first)

Add a variable replacement for this part's adaptive marking.

Parameters:
Name Type Description
variable string

The name of the variable to replace.
part string

The path of the part to use.
must_go_first boolean

Must the referred part be answered before this part can be marked?
Fires:
  • Numbas.Part#event:addVariableReplacement
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allChildren() → {Array.<Numbas.jme.parts.Part>}

All children of this part: all gaps and steps, but not alternatives.

Returns:
Type Description
Array.<Numbas.jme.parts.Part>
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applyScoreLimits()

Make sure the awarded score is between the minimum and maximum available.

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apply_feedback(feedback)

Apply a finalised list of feedback states to this part.

Parameters:
Name Type Description
feedback Array.<Numbas.marking.feedback_item>
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assignName(index, siblings) → {boolean}

Assign a name to this part, and then assign names to its children.

Parameters:
Name Type Description
index number

The number of parts before this one that have names.
siblings number

The number of siblings this part has.
Fires:
  • Numbas.Part#event:assignName
Returns:
Type Description
boolean

true if this part has a name that should increment the label counter.
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availableMarks() → {number}

The total marks available for this part, after applying adaptive marking and steps penalties.

Returns:
Type Description
number
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availableNextParts() → {Array.<Numbas.parts.NextPart>}

Currently available next parts.

Returns:
Type Description
Array.<Numbas.parts.NextPart>
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baseMarkingScript() → {Numbas.marking.MarkingScript}

The script to mark this part - assign credit, and give messages and feedback.

Returns:
Type Description
Numbas.marking.MarkingScript
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calculateScore()

Calculate the student's score based on their submitted answers.

Calls the parent part's calculateScore method at the end.

Fires:
  • Numbas.Part#event:calculateScore
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do_pre_submit_tasks(studentAnswer, scope, exec_path) → {object}

Do all of the pre-submit tasks before marking an answer. Results are cached by exec_path and studentAnswer.

Parameters:
Name Type Description
studentAnswer Numbas.jme.token
scope Numbas.jme.Scope
exec_path string
Fires:
  • Numbas.Part#event:do_pre_submit_tasks
Returns:
Type Description
object
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error(message, args, originalErroropt)

Throw an error, with the part's identifier prepended to the message.

Parameters:
Name Type Attributes Description
message string
args object

Arguments for the error message.
originalError Error <optional>

If this is a re-thrown error, the original error object.
Fires:
  • Numbas.Part#event:error
Throws:
Numbas.Error
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errorCarriedForwardScope() → {Numbas.jme.Scope}

Replace variables with student's answers to previous parts.

Returns:
Type Description
Numbas.jme.Scope
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finaliseLoad()

Perform any tidying up or processing that needs to happen once the part's definition has been loaded.

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getCorrectAnswer(scope) → {matrix}

Compute the correct answer, based on the given scope - a matrix filled with 1 for choices that should be selected, and 0 otherwise.

Parameters:
Name Type Description
scope Numbas.jme.Scope
Returns:
Type Description
matrix
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getErrorCarriedForwardReplacements() → {Array.<Numbas.parts.adaptive_variable_replacement_definition>}

Return the list of variable replacements to make for adaptive marking. For alternatives, the parent part is used, otherwise this part is used.

Returns:
Type Description
Array.<Numbas.parts.adaptive_variable_replacement_definition>
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getScope() → {Numbas.jme.Scope}

Get a JME scope for this part. If this.question is set, use the question's scope. Otherwise, use Numbas.jme.builtinScope.

Returns:
Type Description
Numbas.jme.Scope
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giveWarning(warning)

Give the student a warning about this part.

Parameters:
Name Type Description
warning string
Fires:
  • Numbas.Part#event:giveWarning
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hasStagedAnswer() → {boolean}

Has the student entered an answer to this part?

Returns:
Type Description
boolean
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hideSteps()

Close the steps box. This doesn't affect the steps penalty.

Fires:
  • Numbas.Part#event:hideSteps
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initDisplay()

Initialise this part's display object. Only called if the question this part belongs to has a display.

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input_options() → {object}

Options for this part's input widget.

Returns:
Type Description
object
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input_widget() → {string}

The name of the input widget this part uses, if any.

Returns:
Type Description
string
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loadFromJSON(data)

Load the part's settings from a JSON object.

Parameters:
Name Type Description
data object
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loadFromXML(xml)

Load the part's settings from an XML <part> node.

Parameters:
Name Type Description
xml Element
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lock()

Lock this part.

Fires:
  • Numbas.Part#event:lock
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makeNextPart(np, indexopt)

Make an instance of the selected next part.

Parameters:
Name Type Attributes Description
np Numbas.parts.NextPart
index number <optional>

The position of the part in the question's parts list (added to the end if not given).
Fires:
  • Numbas.Part#event:makeNextPart
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makeScope(parentScopeopt) → {Numbas.jme.Scope}

Make the scope for this part.

Parameters:
Name Type Attributes Description
parentScope Numbas.jme.Scope <optional>

An optional parent scope. If not given, the following are tried: a parent part, the question this part belongs to, Numbas.jme.builtinScope.
Fires:
  • Numbas.Part#event:makeScope
Returns:
Type Description
Numbas.jme.Scope
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mark(scope, exec_path) → {Numbas.parts.mark_result}

Function which marks the student's answer: run this.settings.markingScript, which sets the credit for the student's answer to a number between 0 and 1 and produces a list of feedback messages and warnings. If the question has been answered in a way that can be marked, this.answered should be set to true.

Parameters:
Name Type Description
scope Numbas.jme.Scope
exec_path string

A description of the path of execution, for caching pre-submit tasks.
Fires:
  • Numbas.Part#event:pre-mark
  • Numbas.Part#event:post-mark
Returns:
Type Description
Numbas.parts.mark_result
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markAdaptive() → {Numbas.parts.marking_results}

Mark this part, using adaptive marking when appropriate.

Fires:
  • Numbas.Part#event:pre-markAdaptive
  • Numbas.Part#event:post-markAdaptive
Returns:
Type Description
Numbas.parts.marking_results
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markAgainstScope(scope, feedback, exec_path) → {Numbas.parts.marking_results}

Mark the student's answer against the given scope.

Parameters:
Name Type Description
scope Numbas.jme.Scope

Scope in which to calculate the correct answer.
feedback Object.<Array.<string>>

Dictionary of existing warnings and markingFeedback lists, to add to - copies of these are returned with any additional feedback appended.
exec_path string

A description of the path of execution, for caching pre-submit tasks.
Fires:
  • Numbas.Part#event:markAgainstScope
Returns:
Type Description
Numbas.parts.marking_results
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markAlternatives(scope, feedback, exec_path) → {Numbas.parts.markAlternatives_result}

Mark the student's answer against this part and its alternatives, and return the feedback corresponding to the alternative awarding the most credit.

Parameters:
Name Type Description
scope Numbas.jme.Scope

Scope in which to calculate the correct answer.
feedback Object.<Array.<string>>

Dictionary of existing warnings and markingFeedback lists, to add to - copies of these are returned with any additional feedback appended.
exec_path string

A description of the path of execution, for caching pre-submit tasks.
Returns:
Type Description
Numbas.parts.markAlternatives_result
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mark_answer(studentAnswer, scope, exec_path) → {Numbas.marking.marking_script_result}

Run the marking script against the given answer. This does NOT apply the feedback and credit to the part object, it just returns it.

Parameters:
Name Type Description
studentAnswer Numbas.jme.token
scope Numbas.jme.Scope
exec_path string

A description of the path of execution, for caching pre-submit tasks.
Fires:
  • Numbas.Part#event:pre-mark_answer
  • Numbas.Part#event:post-mark_answer
Returns:
Type Description
Numbas.marking.marking_script_result
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markingComment(message, reason, format)

Add a comment to the marking feedback.

Parameters:
Name Type Description
message string
reason string
format string

The format of the message: "html" or "string".
Fires:
  • Numbas.Part#event:markingComment
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marking_parameters(studentAnswer, pre_submit_parameters, exec_path) → {Object.<Numbas.jme.token>}

Get JME parameters to pass to the marking script.

Parameters:
Name Type Description
studentAnswer Numbas.jme.token

The student's answer to the part.
pre_submit_parameters Array.<Object.<Numbas.jme.token>>
exec_path string
Returns:
Type Description
Object.<Numbas.jme.token>
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multCredit(factor, message)

Multiply credit by the given amount - use to apply penalties.

Parameters:
Name Type Description
factor number
message string

Message to show in feedback to explain this action.
Fires:
  • Numbas.Part#event:multCredit
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openSteps()

Open the steps, either because the student asked or the answers to the question are being revealed. This doesn't affect the steps penalty.

Fires:
  • Numbas.Part#event:openSteps
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pleaseResubmit()

Called by another part when its marking means that the marking for this part might change (i.e., when this part replaces a variable with the answer from the other part). Sets this part as dirty, and gives a warning explaining why the student must resubmit.

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(abstract) rawStudentAnswerAsJME() → {Numbas.jme.token}

Get the student's answer as it was entered as a JME data type, to be used in the custom marking algorithm.

Returns:
Type Description
Numbas.jme.token
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removeNextPart(np)

Remove the existing instance of the given next part.

Parameters:
Name Type Description
np Numbas.parts.NextPart
Fires:
  • Numbas.Part#event:removeNextPart
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removeWarnings()

Remove all warnings.

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restore_feedback(feedback)

Restore a set of feedback messages.

Parameters:
Name Type Description
feedback Object.<Array.<string>>

Dictionary of existing warnings and markingFeedback lists, to add to - copies of these are returned with any additional feedback appended.
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resume()

Load saved data about this part from storage. The part is not resubmitted - you must do this afterwards, once any steps or gaps have been resumed.

Fires:
  • Numbas.Part#event:resume
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revealAnswer()

Reveal the correct answers, and any distractor messages for the student's choices. Extends Numbas.parts.Part.revealAnswer.

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setCredit(credit, message, reason)

Set the credit to an absolute value.

Parameters:
Name Type Description
credit number
message string

Message to show in feedback to explain this action.
reason string

Why was the credit set to this value? If given, either 'correct' or 'incorrect'.
Fires:
  • Numbas.Part#event:setCredit
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setDirty(dirty)

Call when the student changes their answer, or submits - update Numbas.parts.Part.isDirty.

Parameters:
Name Type Description
dirty boolean
Fires:
  • Numbas.Part#event:setDirty
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setMarkingScript(markingScriptString, extend_base)

Set this part's JME marking script.

Parameters:
Name Type Description
markingScriptString string
extend_base boolean

Does this script extend the built-in script?
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setScript(name, order, script)

Set a custom JavaScript script.

Parameters:
Name Type Description
name string

The name of the method to override.
order string

When should the script run? 'instead', 'before' or 'after'.
script string

The source code of the script.
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setStudentAnswer()

Save a copy of the student's answer as entered on the page, for use in marking.

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setWarnings(warnings)

Set the list of warnings.

Parameters:
Name Type Description
warnings Array.<string>
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showSteps(dontStore)

Show the steps, as a result of the student asking to show them. If the answers have not been revealed, we should apply the steps penalty.

Parameters:
Name Type Description
dontStore boolean

Don't tell the storage that this is happening - use when loading from storage to avoid callback loops.
Fires:
  • Numbas.Part#event:showSteps
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storeAnswer(answer, dontStore)

Update the stored answer from the student (called when the student changes their answer, but before submitting).

Parameters:
Name Type Description
answer *
dontStore boolean

Don't tell the storage that this is happening - use when loading from storage to avoid callback loops.
Fires:
  • Numbas.Part#event:storeAnswer
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  • {Numbas.parts.Part.stagedAnswer}

storeTick(answer)

Store the student's choices.

Parameters:
Name Type Description
answer object

Object with properties answer and choice, giving the index of the chosen item.
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(abstract) studentAnswerAsJME() → {Numbas.jme.token}

Get the student's answer as a JME data type, to be used in error-carried-forward calculations.

Returns:
Type Description
Numbas.jme.token
Overrides:
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subCredit(credit, message)

Subtract an absolute value from credit.

Parameters:
Name Type Description
credit number

Amount to subtract.
message string

Message to show in feedback to explain this action.
Fires:
  • Numbas.Part#event:subCredit
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submit()

Submit the student's answers to this part - remove warnings. save answer, calculate marks, update scores.

Fires:
  • Numbas.Part#event:pre-submit
  • Numbas.Part#event:post-submit
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submit_no_staged_answer()

Called when this part is submitted but it has no staged answer.

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wait_for_pre_submit(promise)

Wait for a promise to resolve before submitting.

Parameters:
Name Type Description
promise Promise
Fires:
  • Numbas.Part#event:waiting_for_pre_submit
  • Numbas.Part#event:completed_pre_submit
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