# #< quiz
# parts:
# - question: What is 20*20?
# choices:
# - 100
# - 200
# - 400*
# - 500
# multiple: FALSE
# success: Great, your answer is correct!
# failure: Try again.
# - question: State pi up to 2 digits
# answer: 3.14
# roundto: 0.01
# #>
#
examples.quiz = function() {
yaml = '
question: Mit welchen Vorzeichen gehen folgende Komponenten in das BIP, d.h. die gesamtwirtschaftliche Nachfrage ein? Markieren Sie alle richtigen Antworten.
cols: [positiv,negativ]
rows:
- Staatsausgaben | positiv
- Importe | negativ
- Exporte | positiv
'
yaml = '
question: Welche Komponente der gesamtwirtschaftlichen Nachfrage ist ein Deutschland von 2007 bis 2009 am stärksten gefallen?
rank:
- Konsüm C | 3
- Investitionen I | 1
- Staatsausgaben G | 4
- Nettoexporte X | 2
'
yaml = '
question: |
(Vemutung) Welche Aussage trifft in unserem Solow Modell ohne technologischem Fortschritt zu?
sc:
- Bei positiver Sparquote \\(s\\gt0\\), wachsen BIP immer unbeschränkt im Zeitablauf.
- Einkomen und Kapitalstock wachsen nur dann unbeschränkt im Zeitablauf, wenn die Sparquote höher ist, als die Abschreibungsrate \\(\\delta\\).*
'
qu = shinyQuiz(yaml=yaml)
app =eventsApp()
app$ui = qu$ui
viewApp(app)
}
rtutor.widget.quiz = function() {
list(
#clicker = rtutor.clicker.widget.quiz(),
is.task = TRUE,
parse.fun = rtutor.quiz.block.parse,
make.org.task.state = rtutor.quiz.make.org.task.state,
init.task.state = rtutor.quiz.init.task.state,
init.handlers = rtutor.quiz.init.handlers,
ui.fun = rtutor.quiz.shiny.ui,
rmd.fun = rtutor.quiz.rmd
)
}
rtutor.quiz.make.org.task.state = function(wid) {
list(
part.solved=rep(FALSE,length(wid$parts)),
solved=FALSE,
points=0,
wid=wid
)
}
rtutor.quiz.init.task.state = function(ts,ups, task.ind=ts$task.ind,...) {
if (is.null(ups)) return(ts)
ts$solved = ups$utt$was.solved[task.ind]
ts$part.solved = rep(ts$solved)
ts
}
rtutor.quiz.rmd = function(ts, ...) {
sol.md = quiz.md(ts$wid, solution=TRUE)
list(
"rmd" =sol.md,
"sol" = sol.md,
"shown" = quiz.md(ts$wid, solution=FALSE)
)
}
rtutor.quiz.shiny.ui = function(ts, wid=ts$wid, ...) {
restore.point("rtutor.quiz.shiny.ui")
quiz.ui(wid, solution=isTRUE(ts$solved))
}
rtutor.quiz.init.handlers = function(wid=ts$wid,ps=get.ps(), app=getApp(),ts=NULL,...) {
add.quiz.handlers(qu=wid, quiz.handler=rtutor.quiz.handler)
}
rtutor.quiz.block.parse = function(inner.txt,type="quiz",name="",id=paste0("addon__",type,"__",name),args=NULL, bdf=NULL, bi=NULL, ps=get.ps(), show.points=TRUE,...) {
restore.point("rtutor.quiz.block.parse")
whiskers =NULL
if (isTRUE(ps$opts$use.whiskers)) {
whiskers = ps$pre.env$.whiskers
}
lang = first.non.null(ps$opts[["lang"]], "en")
qu = shinyQuiz(id = id,yaml = merge.lines(inner.txt), bdf = NULL,add.handler = FALSE, whiskers=whiskers, lang=lang, show.points=show.points)
qu
}
rtutor.quiz.handler = function(qu, part.solved, solved, ts=get.ts(qu$task.ind),app=getApp(),...) {
restore.point("rtutor.quiz.handler")
ts$solved = solved
ts$part.solved = part.solved
ts$points = (sum(part.solved) / length(part.solved))*qu$max.points
process.checked.widget(ts=ts)
}
examples.quiz = function() {
yaml = '
parts:
- question: What is 20*20?
choices:
- 100
- 200
- 400*
- 500
multiple: FALSE
success: Great, your answer is correct!
failure: Try again.
- question: State pi up to 2 digits
answer: 3.14
roundto: 0.01
award:
title: Quiz master
text: You solved the quiz!
'
app = eventsApp()
qu = parse.quiz.yaml(yaml)
qu$ui = quiz.ui(qu)
app$ui = qu$ui
add.quiz.handlers(qu)
runEventsApp(app, launch.browser=rstudioapi::viewer)
}
quizDefaults = function(lang="en") {
if (lang=="de") {
list(
success = "Richtig!",
failure= "Leider noch nicht richtig.",
success_color = "black",
failure_color = "red",
points_txt = "Punkte",
point_txt = "Punkt"
)
} else {
list(
success = "Great, you answered correctly!",
failure= "Sorry, not yet correct.",
success_color = "black",
failure_color = "red",
points_txt = "points",
point_txt = "point"
)
}
}
#' Create a shiny quiz widget
#'
#' @param id the id of the quiz
#' @param qu a list that contains the quiz fields as would have
#' been parsed by read.yaml from package YamlObjects
#' @param yaml alternatively to qu, is yaml a string that specifies the quiz
#' @param quiz.handler a function that will be called if the quiz is checked.
#' The boolean argument solved is TRUE if the quiz was solved
#' and otherwise FALSE
shinyQuiz = function(id=paste0("quiz_",sample.int(10e10,1)),qu=NULL, yaml, blocks.txt=NULL, bdf=NULL, quiz.handler=NULL, add.handler=TRUE, defaults=quizDefaults(lang=lang), lang="en", whiskers=NULL,add.check.btn=TRUE, show.points=TRUE) {
restore.point("shinyQuiz")
if (is.null(qu)) {
yaml = enc2utf8(yaml)
qu = try(mark_utf8(parse.hashdot.yaml(yaml)), silent=TRUE)
if (is(qu,"try-error")) {
err = paste0("When importing quiz:\n",paste0(yaml, collapse="\n"),"\n\n",as.character(qu))
stop(err,call. = FALSE)
}
}
if (is.null(qu[["id"]])) {
qu$id = id
}
if (is.null(qu$parts)) {
qu$parts = list(qu)
}
qu$checkBtnId = paste0(qu$id,"__checkBtn")
qu$parts = lapply(seq_along(qu$parts), function(ind) {
init.quiz.part(qu$parts[[ind]],ind,qu,whiskers=whiskers,add.check.btn=add.check.btn, show.points = show.points, lang=lang)
})
if (!is.null(qu$explain))
qu$explain.html = md2html(qu$explain)
np = length(qu$parts)
qu$max.points = sum(sapply(qu$parts, function(part) part[["points"]]))
qu$ui = quiz.ui(qu, add.check.btn=add.check.btn)
if (add.handler)
add.quiz.handlers(qu, quiz.handler)
qu$type = "quiz"
qu
}
init.quiz.part = function(part=qu$parts[[part.ind]], part.ind=1, qu, defaults=quizDefaults(lang=lang), whiskers=list(), add.check.btn=TRUE, show.points = TRUE, lang="en") {
restore.point("init.quiz.part")
part = copy.into.missing.fields(dest=part, source=defaults)
if (!is.null(part[["rows"]]) | !is.null(part[["rank"]])) {
return(init.quiz.grid.part(part=part,qu=qu,defaults=defaults, whiskers=whiskers, add.check.btn=add.check.btn))
}
if (!is.null(part[["sc"]])) {
part$choices = part$sc
part$multiple = FALSE
#part$type = "sc"
} else if (!is.null(part[["mc"]])) {
part$choices = part$mc
part$multiple = TRUE
#part$type = "mc"
}
if (!is.null(part$choices)) {
if (!is.null(part[["answer.ind"]])) {
if (is.character(part$answer.ind)) {
part$answer.ind = list.string.to.vector(part$answer.ind,class="integer")
}
correct.choices = part$answer.ind
} else {
correct.choices = which(str.ends.with(part$choices,"*"))
part$choices[correct.choices] = str.remove.ends(part$choices[correct.choices],right=1)
}
if (is.null(part$multiple)) {
part$multiple = length(correct.choices) != 1
}
part$correct.choices = correct.choices
part$choices = lapply(part$choices, replace.whiskers,values=whiskers)
part$answer = unlist(part$choices[correct.choices])
names(part$choices) =NULL
if (part$multiple) {
part$type = "mc"
} else {
part$type = "sc"
}
} else if (!is.null(part$answer)) {
if (is.numeric(part$answer)) {
part$type = "numeric"
if (is.null(part$roundto)) part$roundto=1e-7
} else {
part$type = "text"
}
} else {
stop(paste0("The quiz with question ", part$question, " has neither defined the field 'answer' nor the field 'choices'."))
}
if (is.null(part[["points"]])) {
if (part$type == "sc") {
part$points = 2
} else if (part$type == "mc") {
part$points = 0.5*length(part$choices)
} else {
part$points = 2
}
}
part$question.html = md2html(replace.whiskers(part$question,values=whiskers))
if (!is.null(part$explain))
part$success = paste0(part$success,"\n\n", part$explain)
txt = replace.whiskers(part$success,whiskers)
if (show.points) {
if (part$points==1) {
txt = paste0(txt," (", part$points, " ", defaults$point_txt,")")
} else if (part$points > 0 ) {
txt = paste0(txt," (", part$points, " ", defaults$points_txt,")")
}
}
txt = colored.html(txt, part$success_color)
part$success = md2html(text=txt, fragment.only=TRUE)
if (!is.null(part$explain))
part$failure = paste0(part$failure,"\n\n", part$explain)
txt = replace.whiskers(part$failure, whiskers)
txt = colored.html(txt, part$failure_color)
part$failure = md2html(text=txt, fragment.only=TRUE)
part$id = paste0(qu$id,"__part", part.ind)
part$answerId = paste0(part$id,"__answer")
part$resultId = paste0(part$id,"__resultUI")
part$ui = quiz.part.ui(part,add.button = add.check.btn & !is.null(part$checkBtnId))
part$solved = FALSE
if (is.null(part$points)) {
part$points = 1
}
part
}
init.quiz.grid.part = function(part=qu$parts[[part.ind]], part.ind=1, qu, defaults=quizDefaults(), whiskers=list(), add.check.btn=TRUE) {
restore.point("init.quiz.grid.part")
part = copy.into.missing.fields(dest=part, source=defaults)
if (!is.null(part[["rank"]])) {
part$rows = part$rank
row.has.answers = all(has.substr(part$rows,"|"))
if (!row.has.answers) {
part$rows = paste0(part$rows, " | ", seq_along(part$rows))
# shuffle rows
part$rows = sample(part$rows)
}
part$cols = 1:NROW(part$rank)
}
# a grid part specifies rows and cols
rows = part$rows
cols = part$cols
part$row.has.answers = row.has.answers = all(has.substr(rows,"|"))
if (!row.has.answers) {
stop("You must specify the answers after a | in the rows.")
}
if (row.has.answers) {
answers = str.right.of(rows,"|")
part$rows = rows = str.trim(str.left.of(rows,"|"))
} else {
answers = str.right.of(cols,"|")
part$cols = cols = str.trim(str.left.of(cols,"|"))
}
answers = lapply(answers, function(answer)
str.trim(strsplit(answer,",", fixed=TRUE))
)
part$answers = answers
if (is.null(part$multiple)) {
len.answers = sapply(answers, length)
part$multiple = !all(len.answers==1)
}
if (is.null(part[["points"]])) {
part$points = 1*length(part$rows)
}
part$question.html = md2html(replace.whiskers(part$question,values=whiskers))
if (!is.null(part$explain))
part$success = paste0(part$success,"\n\n", part$explain)
txt = replace.whiskers(part$success,whiskers)
if (part$points==1) {
txt = paste0(txt," (", part$points, " ", defaults$point_txt,")")
} else if (part$points > 0 ) {
txt = paste0(txt," (", part$points, " ", defaults$points_txt,")")
}
txt = colored.html(txt, part$success_color)
part$success = md2html(text=txt, fragment.only=TRUE)
if (!is.null(part$explain))
part$failure = paste0(part$failure,"\n\n", part$explain)
txt = replace.whiskers(part$failure, whiskers)
txt = colored.html(txt, part$failure_color)
part$failure = md2html(text=txt, fragment.only=TRUE)
part$id = paste0(qu$id,"__part", part.ind)
part$answerId = paste0(part$id,"__answer")
part$resultId = paste0(part$id,"__resultUI")
part$ui = quiz.grid.part.ui(part,add.button = add.check.btn & !is.null(part$checkBtnId))
part$solved = FALSE
if (part$multiple) {
part$type = "grid_mc"
} else {
part$type = "grid_sc"
}
part$choices = part$cols
if (is.null(part$points)) {
part$points = 1
}
part
}
quiz.grid.part.ui = function(part, solution=FALSE, add.button=!is.null(part$checkBtnId)) {
restore.point("quiz.grid.part.ui")
head = list(
HTML(part$question.html)
)
ids = paste0(part$answerId,seq_along(part$rows))
# TO DO: Put in tables
inner = lapply(seq_along(part$rows), function(row){
if (part$multiple) {
stop("Grid quiz not yet implemented for checkboxes...")
} else {
gridRowRadioButtons(ids[row], choices = part$cols, selected=NA)
}
})
rows = paste0('<tr id="',ids,'" class="shiny-input-radiogroup shiny-input-container"><td>',part$rows,"</td>",inner,'</tr>')
tab = paste0('<table class="rowRadioTable"><tr><td></td>',paste0("<td style='text-align: center; padding-left: 5px; padding-right: 5px'>",part$cols,"</td>", collapse=""),"</tr>" ,paste0(rows,collapse=""),'</table>')
if (add.button) {
button = submitButton(part$checkBtnId,label = "check", form.ids = part$answerId)
} else {
button = NULL
}
list(head,HTML(tab),uiOutput(part$resultId),button)
}
gridRowRadioButtons = function(inputId, choices, selected = NA, only.inner = FALSE) {
restore.point("rowRadioButtons")
choices = shiny:::choicesWithNames(choices)
checked = rep("", length(choices))
if (!is.na(selected)) {
names(checked) = as.character(choices)
checked[selected] = ' checked="checked"'
}
inner = paste0('
<td align="center" style="padding-left: 5px; padding-right: 5px"><input type="radio" name="', inputId,'" value="',choices,'"',checked,'/></td>', collapse="\n")
return(inner)
}
quiz.ui = function(qu, solution=FALSE, add.check.btn=TRUE) {
restore.point("quiz.ui")
pli = lapply(seq_along(qu$parts), function(i) {
restore.point("quiz.ui.inner")
part = qu$parts[[i]]
if (i < length(qu$parts)) {
hr = hr()
} else {
hr = NULL
}
if (solution) {
if (is.null(part$sol.ui)) {
part$sol.ui = quiz.part.ui(part, solution=TRUE)
}
setUI(part$resultId,HTML(part$success))
return(list(part$sol.ui,hr))
} else {
return(list(part$ui,hr))
}
})
if (!is.null(qu$checkBtnId) & add.check.btn) {
ids = sapply(qu$parts, function(part) part$answerId)
pli = c(pli, list(submitButton(qu$checkBtnId,label = "check",form.ids = ids),br()))
}
with.mathjax(div(class="quiz_div",pli))
}
quiz.part.ui = function(part, solution=FALSE, add.button=!is.null(part$checkBtnId)) {
restore.point("quiz.part.ui")
head = list(
HTML(part$question.html)
)
if (solution) {
if (part$type=="numeric") {
answer = textInput(part$answerId, label = NULL,value = part$answer)
} else if (part$type =="text") {
answer = textInput(part$answerId, label = NULL,value = part$answer)
} else if (part$type=="mc") {
answer = checkboxGroupInput(part$answerId, label=NULL,part$choices,selected = part$answer)
} else if (part$type=="sc") {
answer = radioButtons(part$answerId, label=NULL,part$choices, selected=part$answer)
}
#setUI(part$resultId,HTML(part$success))
} else {
if (part$type=="numeric") {
answer = textInput(part$answerId, label = NULL,value = "")
} else if (part$type =="text") {
answer = textInput(part$answerId, label = NULL,value = "")
} else if (part$type=="mc") {
answer = checkboxGroupInput(part$answerId, label=NULL,part$choices)
} else if (part$type=="sc") {
answer = radioButtons(part$answerId, label=NULL,part$choices, selected=NA)
}
}
if (add.button) {
button = submitButton(part$checkBtnId,label = "check", form.ids = part$answerId)
} else {
button = NULL
}
list(head,answer,uiOutput(part$resultId),button)
}
quiz.md = function(qu, solution=FALSE) {
restore.point("quiz.md")
li = lapply(seq_along(qu$parts), function(i) {
part = qu$parts[[i]]
quiz.part.md(part, solution=solution)
})
paste0(li, collapse="\n")
}
quiz.part.md = function(part, solution=FALSE) {
restore.point("quiz.part.md")
head = paste0("\nQuiz: ",part$question,"\n")
if (solution) {
if (part$type=="numeric" | part$type == "text") {
answer = paste0("Answer: ", part$answer)
} else if (part$type=="mc" | part$type=="sc") {
ans = part$choices
mark = rep("[ ]", length(ans))
mark[ans %in% part$answer] = "[x]"
answer = paste0("- ", ans, " ", mark,"\n", collapse="\n")
}
} else {
if (part$type=="numeric" | part$type == "text") {
answer = "Answer: "
} else if (part$type=="mc" | part$type=="sc") {
ans = part$choices
answer = paste0("- ", ans, "[ ]\n", collapse="\n")
}
}
paste0(head,"\n", answer)
}
submitButton = function (inputId, label, icon = NULL, width = NULL, form.ids = NULL, form.sel = ids2sel(form.ids), ...) {
restore.point("submitButton")
actionButton(inputId,label,icon, width, "data-form-selector"=form.sel)
}
add.quiz.handlers = function(qu, quiz.handler=NULL, id=qu$id, show.feedback=TRUE){
restore.point("add.quiz.handlers")
cat("\n**************************************")
cat("\nadd.quiz.handlers...")
cat("\n**************************************")
app = getApp()
if (is.null(app)) {
cat("\nCannot add quiz handlers since no shinyEvents app object is set.")
return()
}
buttonHandler(qu$checkBtnId,fun = click.check.quiz, qu=qu, quiz.handler=quiz.handler, show.feedback=show.feedback)
}
check.quiz.part = function(part.ind,qu, values=NULL, app=getApp(), show.feedback = TRUE) {
part = qu$parts[[part.ind]]
answer = getInputValue(part$answerId)
#answer = values[[part$answerId]]
restore.point("check.quiz.part")
if (part$type =="numeric") {
answer = as.numeric(answer)
correct = is.true(abs(answer-part$answer)<part$roundto)
} else {
correct = setequal(answer,part$answer)
}
if (show.feedback) {
if (correct) {
#cat("Correct!")
setUI(part$resultId,HTML(part$success))
} else {
#cat("Wrong")
setUI(part$resultId,HTML(part$failure))
}
}
return(correct)
}
click.check.quiz = function(app=getApp(), qu, quiz.handler=NULL, formValues, show.feedback=TRUE, ...) {
restore.point("click.check.quiz")
part.solved = sapply(seq_along(qu$parts), check.quiz.part, qu=qu,app=app, values=formValues, show.feedback=show.feedback)
solved = all(part.solved)
if (!is.null(quiz.handler)) {
quiz.handler(app=app, qu=qu, part.solved=part.solved, solved=solved)
}
solved
}
#
# quizRadioButtons = function(inputId, label, choices,...) {
# restore.point("quizeRadioButtons")
# choices = lapply(choices, function(choice) {
# choice = gsub(">",">",choice,fixed = TRUE)
# choice = gsub("<","<",choice, fixed = TRUE)
# choice
# })
# radioButtons(inputId, label, choices,...)
#
# }
examples.list.string.to.vector = function() {
list.string.to.vector("1,3", class="integer")
as("1","numeric")
}
list.string.to.vector = function(str,split=",", class="numeric", fixed=TRUE) {
restore.point("list.string.to.vector")
if (length(str)==0) return(NULL)
if (nchar(str)==0) return(NULL)
vec = str.trim(unlist(strsplit(str,split = split, fixed=fixed)))
as(vec,class)
}
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