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dde266768c
These functions were temporarily ripped out of Shiny and moved to the htmltools package. We've discovered that it's safe to keep including them in shiny; as long as the functions in shiny and the functions in htmltools are identical, the user won't receive a conflict warning.
109 lines
2.5 KiB
R
109 lines
2.5 KiB
R
% Generated by roxygen2 (4.0.1): do not edit by hand
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\name{renderPrint}
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\alias{renderPrint}
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\title{Printable Output}
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\usage{
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renderPrint(expr, env = parent.frame(), quoted = FALSE, func = NULL,
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width = getOption("width"))
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}
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\arguments{
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\item{expr}{An expression that may print output and/or return a printable R
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object.}
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\item{env}{The environment in which to evaluate \code{expr}.}
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\item{quoted}{Is \code{expr} a quoted expression (with \code{quote()})? This}
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\item{func}{A function that may print output and/or return a printable R
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object (deprecated; use \code{expr} instead).}
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\item{width}{The value for \code{\link{options}('width')}.}
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}
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\description{
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Makes a reactive version of the given function that captures any printed
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output, and also captures its printable result (unless
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\code{\link{invisible}}), into a string. The resulting function is suitable
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for assigning to an \code{output} slot.
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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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The result of executing \code{func} will be printed inside a
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\code{\link[utils]{capture.output}} call.
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Note that unlike most other Shiny output functions, if the given function
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returns \code{NULL} then \code{NULL} will actually be visible in the output.
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To display nothing, make your function return \code{\link{invisible}()}.
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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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\seealso{
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\code{\link{renderText}} for displaying the value returned from a
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function, instead of the printed output.
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}
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