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#' Stand-Alone HTML Page Creation
#'
#' This function creates and returns a stand-alone HTML page containing
#' the given canvasXpress object. Width and height can be inferred from
#' the canvasXpress object (default) or overridden for the page output.
#'
#' @param chartObject a canvasXpress plot object
#' @param width plot width override for the HTML page (valid CSS units) - default = NULL
#' @param height plot height override for the HTML page (valid CSS units) - default = NULL
#'
#' @return a character string containing a self-contained html page
#'
#' @examples
#' \dontrun{
#' my_chart <- canvasXpress(data = data.frame(Sample1 = c(33, 48),
#' Sample2 = c(44, 59),
#' Sample3 = c(55, 6)),
#' graphType = "Bar",
#' title = "Example Bar Chart",
#' width = "600px")
#'
#' # create a page using the chart dimensions on my_chart
#' html_page <- cxHtmlPage(my_chart)
#'
#' # or change the chart width/height for this page:
#' html_page <- cxHtmlPage(my_chart, width = "100%", height = "70vh")
#'
#' # save page for viewing/sharing
#' writeLines(html_page, tempfile(fileext = ".html"))
#' }
#'
#' @export
cxHtmlPage <- function(chartObject, width = NULL, height = NULL) {
if (any(is.null(chartObject),
is.na(chartObject),
!inherits(chartObject, "canvasXpress"))) {
stop("chartObject must be supplied and be a canvasXpress object")
}
tryCatch({
if (!is.null(width)) htmltools::validateCssUnit(width)
if (!is.null(height)) htmltools::validateCssUnit(height)
},
error = function(e) {
stop("If width or height are specified they must be valid CSS units.")
})
result <- NULL
tryCatch({
if (!is.null(width)) {
chartObject$width <- width
}
if (!is.null(height)) {
chartObject$height <- height
}
tmp_widget <- tempfile('temp_widget_', fileext = '.html')
tmp_md <- tempfile('temp_md_', fileext = ".md")
tmp_html <- tempfile('temp_html_', fileext = ".html")
page_rmd <- c("---",
"title: ' '",
"output: ",
" html_document",
"---",
"",
"```{r echo = FALSE}",
paste0("append_html_document('", tmp_widget, "')"),
"```")
htmlwidgets::saveWidget(chartObject, tmp_widget)
knitr::knit(text = page_rmd,
output = tmp_md,
envir = new.env(),
quiet = TRUE)
# we do not want a title on the HTML page, so are suppressing the warning about it
rmarkdown::render(input = tmp_md,
output_format = rmarkdown::html_document(pandoc_args = c("--self-contained")),
output_file = tmp_html,
quiet = TRUE)
result <- paste(readLines(tmp_html), collapse = "\n")
try({
unlink(c(tmp_widget, tmp_md, tmp_html))
}, silent = TRUE)
},
error = function(e) {
warning("Unable to create page due to: ", e)
})
result
}
# Append passed html document (i.e CX plot) to downloadable report.
# Note, this function is used over htmlTools package includeHTML function to
# override its generated warning that can't be silenced and added to the report
append_html_document <- function(html_file) {
# convert html document to html fragment before appending it to
# another html document to avoid any possible browser issue from duplicated html tags
lines <- readLines(html_file, warn = FALSE, encoding = "UTF-8")
lines <- paste(lines, collapse = "\n")
lines <- gsub(pattern = "^<!DOCTYPE html>|<html*>|</html>$",
replacement = "",
ignore.case = TRUE,
x = lines)
shiny::HTML(lines)
}
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