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Validate proper CSS formatting of a unit

validateCssUnit(x)

Arguments

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

NULL and NA are returned unchanged.

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

Single element character vectors must be "auto" or "inherit", or a number. If the number has a suffix, it must be valid: px, %, em, pt, in, cm, mm, ex, or pc. If the number has no suffix, the suffix "px" is appended.

Any other value will cause an error to be thrown.

Examples


[1] "10%"
validateCssUnit(400) #treated as '400px'
[1] "400px"