The input slot that will be used to access the value.
label
Display label for the control, or 'NULL for no label.
value
Initial value (can be a colour name or HEX code)
showColour
Whether to show the chosen colour as text inside the input,
as the background colour of the input, or both (default).
palette
The type of colour palette to allow the user to select colours
from. square (default) shows a square colour palette that allows the
user to choose any colour, while limited only gives the user a
predefined list of colours to choose from.
allowedCols
A list of colours that the user can choose from. Only
applicable when palette == "limited". The limited palette
uses a default list of 40 colours if allowedCols is not defined.
allowTransparent
If TRUE, then add a checkbox that allows the
user to select the transparent colour.
transparentText
The text to show beside the transparency checkbox
when allowTransparent is TRUE. The default value is
"Transparent", but you can change it to "None" or any other string. This has
no effect on the return value from the input; when the checkbox is checked,
the input will always return the string "transparent".
returnName
If TRUE, then return the name of an R colour instead
of a HEX value when possible.
Details
A colour input allows users to select a colour by clicking on the desired
colour, or by entering a valid HEX colour in the input box. The input can
be initialized with either a colour name or a HEX value. The return value is
a HEX value by default, but you can use the returnName = TRUE parameter
to get an R colour name instead (only when an R colour exists for the
selected colour).
Since most functions in R that accept colours can also accept the value
"transparent", colourInput has an option to allow selecting the
"transparent" colour. When the user checks the checkbox for this special
colour, the returned value form the input is "transparent".
Note
Unlike the rest of the shinyjs functions, this function does
not require you to call useShinyjs() first.