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124 lines
3.0 KiB
R
124 lines
3.0 KiB
R
% Generated by roxygen2: do not edit by hand
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% Please edit documentation in R/shinywrappers.R
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\name{renderPrint}
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\alias{renderPrint}
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\alias{renderText}
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\title{Text Output}
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\usage{
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renderPrint(
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expr,
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env = parent.frame(),
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quoted = FALSE,
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width = getOption("width"),
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outputArgs = list()
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)
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renderText(
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expr,
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env = parent.frame(),
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quoted = FALSE,
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outputArgs = list(),
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sep = " "
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)
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}
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\arguments{
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\item{expr}{An expression to evaluate.}
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\item{env}{The environment in which to evaluate \code{expr}. For expert use only.}
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\item{quoted}{Is \code{expr} a quoted expression (with \code{quote()})? This
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is useful if you want to save an expression in a variable.}
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\item{width}{Width of printed output.}
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\item{outputArgs}{A list of arguments to be passed through to the implicit
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call to \code{\link[=verbatimTextOutput]{verbatimTextOutput()}} or \code{\link[=textOutput]{textOutput()}} when the functions are
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used in an interactive RMarkdown document.}
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\item{sep}{A separator passed to \code{cat} to be appended after each
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element.}
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}
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\value{
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For \code{renderPrint()}, note the given expression returns \code{NULL} then \code{NULL}
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will actually be visible in the output. To display nothing, make your
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function return \code{\link[=invisible]{invisible()}}.
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}
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\description{
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\code{renderPrint()} prints the result of \code{expr}, while \code{renderText()} pastes it
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together into a single string. \code{renderPrint()} is equivalent to \code{\link[=print]{print()}};
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\code{renderText()} is equivalent to \code{\link[=cat]{cat()}}. Both functions capture all other
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printed output generated while evaluating \code{expr}.
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\code{renderPrint()} is usually paired with \code{\link[=verbatimTextOutput]{verbatimTextOutput()}};
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\code{renderText()} is usually paired with \code{\link[=textOutput]{textOutput()}}.
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}
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\details{
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The corresponding HTML output tag can be anything (though \code{pre} is
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recommended if you need a monospace font and whitespace preserved) and should
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have the CSS class name \code{shiny-text-output}.
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}
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\examples{
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isolate({
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# renderPrint captures any print output, converts it to a string, and
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# returns it
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visFun <- renderPrint({ "foo" })
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visFun()
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# '[1] "foo"'
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invisFun <- renderPrint({ invisible("foo") })
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invisFun()
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# ''
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multiprintFun <- renderPrint({
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print("foo");
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"bar"
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})
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multiprintFun()
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# '[1] "foo"\n[1] "bar"'
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nullFun <- renderPrint({ NULL })
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nullFun()
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# 'NULL'
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invisNullFun <- renderPrint({ invisible(NULL) })
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invisNullFun()
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# ''
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vecFun <- renderPrint({ 1:5 })
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vecFun()
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# '[1] 1 2 3 4 5'
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# Contrast with renderText, which takes the value returned from the function
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# and uses cat() to convert it to a string
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visFun <- renderText({ "foo" })
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visFun()
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# 'foo'
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invisFun <- renderText({ invisible("foo") })
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invisFun()
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# 'foo'
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multiprintFun <- renderText({
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print("foo");
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"bar"
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})
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multiprintFun()
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# 'bar'
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nullFun <- renderText({ NULL })
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nullFun()
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# ''
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invisNullFun <- renderText({ invisible(NULL) })
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invisNullFun()
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# ''
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vecFun <- renderText({ 1:5 })
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vecFun()
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# '1 2 3 4 5'
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})
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}
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