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#' Add css to tableHTML's second headers
#'
#' \code{add_css_second_header} will add css to a tableHTML's second headers
#'
#' \code{add_css_second_header} will add css to a tableHTML's second headers.
#'
#' @param tableHTML A tableHTML object created by the tableHTML function.
#'
#' @param css A list of two elements with the corresponding css. The first element of the list
#' should be an atomic vector with the style definitions (e.g. background-color). The second
#' element will be an atomic vector with the same length as the first element, which will
#' contain the style definitions' values (e.g. red). Check the examples for more information.
#'
#' @param second_headers A numeric atomic vector with the indices of the second headers where the
#' style definitions will be applied on. At least one second header index must be provided.
#'
#' @return A tableHTML object.
#'
#' @examples
#' tableHTML(mtcars, second_headers = list(c(3, 4, 5), c('col1', 'col2', 'col3'))) %>%
#' add_css_second_header(css = list(c('background-color', 'border'),
#' c('lightgray', '3px solid green')),
#' second_headers = c(1, 3))
#'
#' @export
add_css_second_header <- function(tableHTML,
css,
second_headers) {
#checks
if (!inherits(tableHTML, 'tableHTML')) stop('tableHTML needs to be a tableHTML object')
if (length(css[[1]]) != length(css[[2]])) stop('css needs to be a list of two elements of the
same length')
attributes <- attributes(tableHTML)
#create style
css_comp <- paste0(css[[1]], ':', css[[2]], ';')
css_comp <- paste(css_comp, collapse = '')
style <- paste0('style="', css_comp, '"')
for (i in second_headers) {
tableHTML <- gsub(paste0('id="tableHTML_second_header_', i, '" style='),
paste0('id="tableHTML_second_header_', i, '"'),
tableHTML)
tableHTML <- gsub(paste0('id="tableHTML_second_header_', i, '"'),
paste0('id="tableHTML_second_header_', i, '" ', style),
tableHTML)
tableHTML <- gsub(';""', ';', tableHTML)
}
attributes(tableHTML) <- attributes
tableHTML
}
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