R/dw_button_helper.R

In d-qn/tamTheme: Chart themes, colours and convenience functions

##' Generate HTML buttons for datawrapper
##'
##' Create clickable buttons to navigate different datawrapper charts
##'   
##' dw_button_helper
##' 
##' @param dw_id a character vector of datawrapper ids
##' @param dw_label a character vector of labels for the buttons
##' @param bg_col_hl a character string for the background color of the highlighted button
##' @param bg_col_norm a character string for the background color of the normal button
##' @param font_col_hl a character string for the font color of the highlighted button
##' @param font_col_norm a character string for the font color of the normal button
##' @param font_weight_hl a numeric value for the font weight of the highlighted button
##' @param font_weight_norm a numeric value for the font weight of the normal button
##' 
##' @rdname dw_button_helper
##' @return a character string
##' @export
##' @examples
##' dw_id <- c("tXf1C", "6MxFK")
##' dw_label <- c("2025", "2021")
##' dw_button_helper(dw_id, dw_label) 

dw_button_helper <- function(
    dw_id, 
    dw_label,
    bg_col_hl = "#414241",
    bg_col_norm = "#BFC0BF",
    font_col_hl = "#FFFFFF",
    font_col_norm = "#FFFFFF",
    font_weight_hl = 800,
    font_weight_norm = 400
) {
  stopifnot(length(dw_id) == length(dw_label))
  
  res_buttons <- rep("", length(dw_id))
  # loop though each dw_id
   for(i in 1:length(dw_id)) {
    
    bg_col_v <- rep(bg_col_norm, length(dw_id))
    bg_col_v[i] <- bg_col_hl
    
    font_col_v <- rep(font_col_norm, length(dw_id))
    font_col_v[i] <- font_col_hl
    
    font_weight_v <- rep(font_weight_norm, length(dw_id))
    font_weight_v[i] <- font_weight_hl
    
    dw_button <- paste0(
      '<a target="_self" href="https://datawrapper.dwcdn.net/',
      dw_id,
      '" style="background:', 
      bg_col_v,
      '; padding:2px 2px; border-radius:3px; color:',
      font_col_v,
      '; font-weight:', font_weight_v,
      '; box-shadow:0px 0px 4px 2px rgba(0,0,0,0.07); cursor:pointer;" rel="nofollow noopener noreferrer"> &nbsp;',
      dw_label,
      ' &nbsp;</a> '
    ) |> paste(collapse = "")
    res_buttons[i] <- dw_button 
  }
  res_buttons
}