shiny/man/validateCssUnit.Rd

\name{validateCssUnit}
\alias{validateCssUnit}
\title{Validate proper CSS formatting of a unit}
\usage{
  validateCssUnit(x)
}
\arguments{
  \item{x}{The unit to validate. Will be treated as a
  number of pixels if a unit is not specified.}
}
\value{
  A properly formatted CSS unit of length, if possible.
  Otherwise, will throw an error.
}
\description{
  Checks that the argument is valid for use as a CSS unit
  of length.
}
\details{
  \code{NULL} and \code{NA} are returned unchanged.

  Single element numeric vectors are returned as a
  character vector with the number plus a suffix of
  \code{"px"}.

  Single element character vectors must be \code{"auto"} or
  \code{"inherit"}, or a number followed by a valid suffix:
  \code{px}, \code{\%}, \code{em}, \code{pt}, \code{in},
  \code{cm}, \code{mm}, \code{ex}, or \code{pc}.

  Any other value will cause an error to be thrown.
}
\examples{
validateCssUnit("10\%")
validateCssUnit(400)  #treated as '400px'
}